CN109097651B - A kind of low-phosphorous high carbon ferro-chrome and its smelting process - Google Patents
A kind of low-phosphorous high carbon ferro-chrome and its smelting process Download PDFInfo
- Publication number
- CN109097651B CN109097651B CN201810901996.1A CN201810901996A CN109097651B CN 109097651 B CN109097651 B CN 109097651B CN 201810901996 A CN201810901996 A CN 201810901996A CN 109097651 B CN109097651 B CN 109097651B
- Authority
- CN
- China
- Prior art keywords
- low
- phosphorous
- high carbon
- smelting process
- carbon ferro
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
- C22C27/06—Alloys based on chromium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C35/00—Master alloys for iron or steel
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention relates to technical field of metallurgy industry, more particularly, to a kind of low-phosphorous high carbon ferro-chrome and its smelting process.The smelting process includes the following steps: to be smelted using chromite, coke, semi-coke and slag former as primary raw material, makes finishing slag SiO2‑CaO‑MgO‑Al2O3Quaternary slag type, the basicity of finishing slag are 1.2-1.5, the MgO/Al of the feed stock for blast furnace2O3Ratio be 0.9-1.1.The low-phosphorous high carbon ferro-chrome includes following component: by weight percentage, Cr 55-60%, Si≤3.0%, C 4-10%, P≤0.02%, S≤0.04%, remaining is iron and inevitable impurity.The present invention adjusts basicity, slag type, enters furnace magnalium ratio and smelting temperature, improves the dephosphorizing capacity of clinker and increases the distribution coefficient of phosphorus；And the smelting hot-zone of caused electric arc furnaces under the conditions of high alkalinity is avoided to move up, the problem of production and technical indication difference.
Description
Technical field
The present invention relates to technical field of metallurgy industry, more particularly, to a kind of low-phosphorous high carbon ferro-chrome and its smelting process.
Background technique
Ferrochrome be produce stainless steel important raw material, be mainly used in production stainless steel, ball-bearing steel, tool steel,
Nitrided steel, refractory steel, quenched and tempered steel, carburizing steel and hydrogen resistant steel, this is because chromium playing a decisive role in stainless steel, determines stainless
The element of steel is anti-corrosion attribute is chromium, and a certain number of chromium are centainly contained in every kind of stainless steel capital.
Ball rigid, bearing steel, tool steel etc. are special steels, it is desirable that wearability, antifatigue, high rigidity, and have good
Heat resistance.And P, S impurity in steel constrain its development.P is harmful element in steel, easily occurs steel " cold short " existing
As influencing to become apparent when carbon content is high.
In view of this, the present invention is specifically proposed.
Summary of the invention
The first object of the present invention is to provide a kind of smelting process of low-phosphorous high carbon ferro-chrome, the method simple process,
Pass through cooperation adjustment slag type, basicity and the MgO/Al for entering furnace2O3Ratio, promote P to enter slag, reduce the content of P in alloy, obtain
Low-phosphorous high carbon ferro-chrome improves the performance of ferrochrome.
The second object of the present invention is to provide a kind of low-phosphorous high carbon ferro-chrome, and phosphorus content is low in the high carbon ferro-chrome, improves
Rigid mechanical mechanics property etc..
In order to realize above-mentioned purpose of the invention, the following technical scheme is adopted:
The present invention provides a kind of smelting processes of low-phosphorous high carbon ferro-chrome, include the following steps:
It is smelted using chromite, coke, semi-coke and slag former as primary raw material, makes finishing slag SiO2-CaO-MgO-
Al2O3Quaternary slag type, the basicity of finishing slag are 1.2-1.5；
The MgO/Al of the feed stock for blast furnace2O3Ratio be 0.9-1.1.
Preferably, the basicity of the finishing slag is 1.4-1.5.
Preferably, the MgO/Al of the feed stock for blast furnace2O3Ratio be 0.95-1.05.
By the compounding of chromite, slag former, coke and semi-coke, while adjusting into the magnalium ratio of furnace and the basicity of finishing slag
Within the above range, while improving basicity removing phosphorus, the MgO/Al of feed stock for blast furnace is reduced2O3Ratio, it is ensured that electrode is deep
It inserts, avoids under the conditions of high alkalinity, CaO electric conductivity is strong, and the smelting hot-zone that too high levels will lead to electric arc furnaces moves up, caused by
Operation difficulty is big, the problem of production and technical indication difference.
Preferably, the finishing slag includes SiO by mass percentage226-32%, CaO 7-12%, MgO 28-
34% and Al2O322-28%.
By adjusting above-mentioned finishing slag slag type, P can be significantly reduced2O5Activity coefficient, to improve the dephosphorizing capacity of clinker
With the distribution coefficient for increasing phosphorus.
lgγP2O5=-1.12 (22xCaO+15xMgO-2xSiO2)-44600/T+23.80
Preferably, the mass ratio of the chromite, semi-coke, coke and slag former be 100 ﹕ (3-4) ﹕ (7-9) ﹕ (5-10),
Preferably 100 ﹕ (3.2-3.6) ﹕ (7.6-8.4) ﹕ (6-7).
Preferably, the mass ratio of the semi-coke and coke is 1 ﹕ (2-3), preferably 3 ﹕ 7.
The content of phosphorus is low in semi-coke, and cost is reasonable, but the burn out rate of semi-coke is high, by adjusting the mass ratio of semi-coke and coke
Within the above range, the content of phosphorus can be reduced by feed stock for blast furnace, while guaranteeing carbon content.Also, it is used in above-mentioned slag former
It measures in range, the quaternary slag type for obtaining certain basicity can be guaranteed, phosphorus is reduced to satisfactory content.
Preferably, the slag former includes lime stone and/or silica.
In lime, content >=85%, SiO of CaO2Content≤2%, MgO content≤5%.
The main component of silica is SiO2, content is not less than 90%.
Preferably, the smelting temperature is 1580-1640 DEG C, preferably 1610 ± 10 DEG C.It is furthermore preferred that the duration of heat
For 3-5h, preferably 4h.
Preferably, secondary voltage is adjusted, adjusting voltage keeps smelting reducing region constant, and the amplitude for adjusting voltage is ± 8V.
Secondary voltage is adjusted, it is ensured that electrode (smelting reducing region) is motionless, second level above and below regulation stall.
The present invention removes phosphorus with calcium oxide, and P in clinker can be significantly reduced in the alkalinity of calcium oxide2O5Activity coefficient, thus
It improves the dephosphorizing capacity of clinker and increases the distribution coefficient of phosphorus.Basicity is higher, and the effective concentration of CaO is higher in slag, the distribution of phosphorus
Coefficient is bigger, and dephosphorization is more complete.But not the higher the better for basicity, excessive CaO is added will lead to clinker and become sticky, and influences to flow
Dynamic property, it is unfavorable instead to dephosphorization.The present invention is adjusted by taking into account adjustment smelting temperature within the above range into furnace magnalium
Inserted deeply than, it is ensured that electrode, the smelting hot-zone of caused electric arc furnaces under the conditions of high alkalinity avoided to move up, caused by operation difficulty
Greatly, the problem of production and technical indication difference.
Dephosphorisation reaction is strong exothermic reaction, and if temperature reduces, the equilibrium constant of dephosphorisation reaction increases, the distribution system of phosphorus
Number increases, and therefore, from the aspects of thermodynamics, favors low temperature is in dephosphorization.But since dephosphorization uses the basic slag containing CaO, and add
The slag former entered, which needs certain temperature, could form liquid slag, and therefore, above-mentioned temperature is that can have one guaranteeing clinker
Determine the lower temperature of basicity and mobility, it being capable of effective dephosphorization.
Preferably, in the chromite, MgO and Al2O3The sum of mass percent≤35%, preferably≤25%.
Preferably, in the chromite, Cr2O3With mass ratio >=2 of FeO.
Enter furnace ferrochrome ratio within the above range, the content for smelting Cr in obtained alloy can be guaranteed in above-mentioned requirements range
It is interior.
Preferably, it will be smelted again after chromite pretreatment.
Preferably, the pretreated method includes: and chromite is soaked in advance in niter buck to handle.
By the way that chromite is soaked in advance in niter buck, dephosphorizing pretreatment can be carried out to chromite, reduce raw material
Phosphorus content.
Preferably, after immersion, chrome ore is dried, is preheated, homogeneous heat treatment.
Preferably, the condition of the drying are as follows: drying temperature is 300-400 DEG C, drying time 10-15min.
Preferably, the condition of the preheating are as follows: preheating temperature is 1000-1100 DEG C, preheating time 5-10min.
Preferably, the condition of the soaking are as follows: 1100-1150 DEG C, soaking time 5-8min.
Preferably, it comes out of the stove after the completion of smelting, collects molten iron of coming out of the stove with iron packet and carburizing is carried out in iron packet to hot-metal insulating
Processing, releases molten iron from iron packet, casts, and finishing obtains low-phosphorous high carbon ferro-chrome.
Preferably, Carburization Treatment includes that carburant is sprayed into molten iron.
Preferably, the dosage of the carburant is 2-5kg/t molten iron.
Preferably, the carburant includes graphite powder.The phosphorus content of the graphite powder is 99.9%, the grain of the graphite powder
Diameter is 300-400 mesh.
During the present invention prepares low-phosphorous high carbon ferro-chrome, reducing agent dosage is micro- scarce carbon operation, and Si content is relatively low in alloy,
Alloy flowability is poor, and Yi Fasheng mucous membrane and knot packet cause product to lose, promote cost.It is operated, can be improved by above-mentioned carburizing
Product appearance quality and performance.
The present invention also provides a kind of low-phosphorous high carbon ferro-chromes, include following component:
By weight percentage, Cr 55-60%, Si≤3.0%, C 4-10%, P≤0.02%, S≤0.04%, remaining
For iron and inevitable impurity.
In most of steel grade, phosphorus belongs to harmful element, and the present invention passes through synchronous adjustment basicity, slag type, enters furnace
Magnalium ratio and smelting temperature etc. improve the dephosphorizing capacity of clinker and increase the distribution coefficient of phosphorus, obtain low-phosphorous high carbon ferro-chrome, mention
The mechanics mechanical strength of high high carbon ferro-chrome, meets the use demand of special steel；And caused by being avoided under the conditions of high alkalinity simultaneously
The smelting hot-zone of electric arc furnaces moves up, caused by operation difficulty it is big, the problem of production and technical indication difference.Product quality, skill are taken into account
Art index and production cost etc..
Preferably, by weight percentage, content≤0.015% of P, preferably≤0.012%, preferably≤0.010%.
Preferably, by weight percentage, the content of Cr is 56-59%, preferably 56.5-58.7%, preferably 57-58%.
Preferably, by weight percentage, content≤3.0% of Si, preferably≤2.8%, preferably≤2.5%.
Preferably, by weight percentage, the content of C is 6-10%, preferably 7-9%, preferably 8.1-8.5%.
Preferably, by weight percentage, content≤0.04% of S, preferably≤0.03%, preferably≤0.02%.
Compared with prior art, the invention has the benefit that
(1) the present invention provides a kind of smelting processes of low-phosphorous high carbon ferro-chrome, by synchronous adjustment basicity, slag type, enter furnace
Magnalium ratio and smelting temperature etc. improve the dephosphorizing capacity of clinker and increase the distribution coefficient of phosphorus, obtain low-phosphorous high carbon ferro-chrome, mention
The mechanics mechanical strength of high high carbon ferro-chrome, meets the use demand of special steel；
(2) smelting process of the invention avoids the smelting hot-zone of caused electric arc furnaces under the conditions of high alkalinity from moving up, and causes
Operation difficulty it is big, the problem of production and technical indication difference；
(3) smelting process of the invention has taken into account product quality, technical indicator and production cost etc.；
(4) the present invention also provides a kind of low-phosphorous high carbon ferro-chrome, in the low-phosphorous high carbon ferro-chrome, content≤0.02% of P,
Mechanical mechanics property etc. is improved, the use demand of special steel is met.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with specific embodiment, but ability
Field technique personnel will be understood that following described embodiments are some of the embodiments of the present invention, instead of all the embodiments,
It is merely to illustrate the present invention, and is not construed as limiting the scope of the invention.Based on the embodiments of the present invention, the common skill in this field
Art personnel every other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.The person that is not specified actual conditions in embodiment, carries out according to conventional conditions or manufacturer's recommended conditions.Agents useful for same or instrument
Production firm person is not specified, is the conventional products that can be obtained by commercially available purchase.
The present invention provides a kind of smelting processes of low-phosphorous high carbon ferro-chrome, include the following steps:
It is smelted using chromite, coke, semi-coke and slag former as primary raw material, makes finishing slag SiO2-CaO-MgO-
Al2O3Quaternary slag type, the basicity of finishing slag are 1.2-1.5；
The MgO/Al of the feed stock for blast furnace2O3Ratio be 0.9-1.1.
In a preferred embodiment of the invention, the basicity of the finishing slag is 1.4-1.5.
In a preferred embodiment of the invention, the MgO/Al of the feed stock for blast furnace2O3Ratio be 0.95-1.05.
By the compounding of chromite, slag former, coke and semi-coke, while adjusting into the magnalium ratio of furnace and the basicity of finishing slag
Within the above range, while improving basicity removing phosphorus, the MgO/Al of feed stock for blast furnace is reduced2O3Ratio, it is ensured that electrode is deep
It inserts, avoids under the conditions of high alkalinity, CaO electric conductivity is strong, and the smelting hot-zone that too high levels will lead to electric arc furnaces moves up, caused by
Operation difficulty is big, the problem of production and technical indication difference.
In a preferred embodiment of the invention, the finishing slag includes SiO by mass percentage226-32%, CaO
7-12%, MgO 28-34% and Al2O322-28%.
By adjusting above-mentioned finishing slag slag type, P can be significantly reduced2O5Activity coefficient, to improve the dephosphorizing capacity of clinker
With the distribution coefficient for increasing phosphorus.
In an of the invention preferred embodiment, the chromite, semi-coke, coke and slag former mass ratio be 100 ﹕
(3-4) ﹕ (7-9) ﹕ (5-10), preferably 100 ﹕ (3.2-3.6) ﹕ (7.6-8.4) ﹕ (6-7).
In a preferred embodiment of the invention, the mass ratio of the semi-coke and coke is 1 ﹕ (2-3), preferably 3 ﹕ 7.
The content of phosphorus is low in semi-coke, and cost is reasonable, but the burn out rate of semi-coke is high, by adjusting the mass ratio of semi-coke and coke
Within the above range, the content of phosphorus can be reduced by feed stock for blast furnace, while guaranteeing carbon content.Also, it is used in above-mentioned slag former
It measures in range, the quaternary slag type for obtaining certain basicity can be guaranteed, phosphorus is reduced to satisfactory content.
In a preferred embodiment of the invention, the slag former includes lime stone and/or silica.
In lime, content >=85%, SiO of CaO2Content≤2%, MgO content≤5%.
The main component of silica is SiO2, content is not less than 90%.
In a preferred embodiment of the invention, the smelting temperature is 1580-1640 DEG C, preferably 1610 ± 10 DEG C.More
Preferably, the duration of heat is 3-5h, preferably 4h.
In a preferred embodiment of the invention, adjusting secondary voltage is to adjust voltage to keep smelting reducing region constant, is adjusted
The amplitude for saving voltage is ± 8V.
The present invention removes phosphorus with calcium oxide, and P in clinker can be significantly reduced in the alkalinity of calcium oxide2O5Activity coefficient, thus
It improves the dephosphorizing capacity of clinker and increases the distribution coefficient of phosphorus.Basicity is higher, and the effective concentration of CaO is higher in slag, the distribution of phosphorus
Coefficient is bigger, and dephosphorization is more complete.But not the higher the better for basicity, excessive CaO is added will lead to clinker and become sticky, and influences to flow
Dynamic property, it is unfavorable instead to dephosphorization.The present invention is adjusted by taking into account adjustment smelting temperature within the above range into furnace magnalium
Inserted deeply than, it is ensured that electrode, the smelting hot-zone of caused electric arc furnaces under the conditions of high alkalinity avoided to move up, caused by operation difficulty
Greatly, the problem of production and technical indication difference.
Dephosphorisation reaction is strong exothermic reaction, and if temperature reduces, the equilibrium constant of dephosphorisation reaction increases, the distribution system of phosphorus
Number increases, and therefore, from the aspects of thermodynamics, favors low temperature is in dephosphorization.But since dephosphorization uses the basic slag containing CaO, and add
The slag former entered, which needs certain temperature, could form liquid slag, and therefore, above-mentioned temperature is that can have one guaranteeing clinker
Determine the lower temperature of basicity and mobility, it being capable of effective dephosphorization.
In a preferred embodiment of the invention, in the chromite, MgO and Al2O3The sum of mass percent≤
25%.
In a preferred embodiment of the invention, in the chromite, Cr2O3With mass ratio >=2 of FeO.
Enter furnace ferrochrome ratio within the above range, the content for smelting Cr in obtained alloy can be guaranteed in above-mentioned requirements range
It is interior.
In a preferred embodiment of the invention, it will be smelted again after chromite pretreatment.
In a preferred embodiment of the invention, the pretreated method includes: that chromite is soaked in niter in advance
It is handled in buck.
By the way that chromite to be soaked in calcium hydroxide in advance, dephosphorizing pretreatment can be carried out to chromite, reduce raw material
Phosphorus content.
In a preferred embodiment of the invention, after immersion, chrome ore is dried, is preheated, homogeneous heat treatment.
In a preferred embodiment of the invention, the condition of the drying are as follows: drying temperature is 300-400 DEG C, when dry
Between be 10-15min.
In a preferred embodiment of the invention, the condition of the preheating are as follows: preheating temperature is 1000-1100 DEG C, preheating
Time 5-10min.
In a preferred embodiment of the invention, the condition of the soaking are as follows: 1100-1150 DEG C, soaking time 5-
8min。
It in a preferred embodiment of the invention, comes out of the stove after the completion of smelting, collects molten iron of coming out of the stove with iron packet, molten iron is protected
Temperature carries out Carburization Treatment in iron packet, and molten iron is released from iron packet, and casting, finishing obtains low-phosphorous high carbon ferro-chrome.
In a preferred embodiment of the invention, Carburization Treatment includes that carburant is sprayed into molten iron.
In a preferred embodiment of the invention, the dosage of the carburant is 2-5kg/t molten iron.
In a preferred embodiment of the invention, the carburant includes graphite powder.The phosphorus content of the graphite powder is
99.9%, the partial size of the graphite powder is 300-400 mesh.
During the present invention prepares low-phosphorous high carbon ferro-chrome, reducing agent dosage is micro- scarce carbon operation, and Si content is relatively low in alloy,
Alloy flowability is poor, and Yi Fasheng mucous membrane and knot packet cause product to lose, promote cost.It is operated, can be improved by above-mentioned carburizing
Product appearance quality and performance.
In the chromite used in the embodiment of the present invention, Cr2O3Content be 40-42%, MgO and Al2O3Quality percentage
The sum of than≤35%, and Cr2O3With mass ratio >=2 of FeO.
The present invention also provides a kind of low-phosphorous high carbon ferro-chromes, include following component:
By weight percentage, Cr 55-60%, Si≤3.0%, C 4-10%, P≤0.02%, S≤0.04%, remaining
For iron and inevitable impurity.
In most of steel grade, phosphorus belongs to harmful element, and the present invention passes through synchronous adjustment basicity, slag type, enters furnace
Magnalium ratio and smelting temperature etc. improve the dephosphorizing capacity of clinker and increase the distribution coefficient of phosphorus, obtain low-phosphorous high carbon ferro-chrome, mention
The mechanics mechanical strength of high high carbon ferro-chrome, meets the use demand of special steel；And caused by being avoided under the conditions of high alkalinity simultaneously
The smelting hot-zone of electric arc furnaces moves up, caused by operation difficulty it is big, the problem of production and technical indication difference.Product quality, skill are taken into account
Art index and production cost etc..
In a preferred embodiment of the invention, by weight percentage, content≤0.015% of P, preferably≤
0.012%, preferably≤0.010%.
In a preferred embodiment of the invention, by weight percentage, the content of Cr is 56-59%, preferably 56.5-
58.7%, preferably 57-58%.
In a preferred embodiment of the invention, by weight percentage, content≤3.0% of Si, preferably≤2.8%,
It is preferred that≤2.5%.
In an of the invention preferred embodiment, by weight percentage, the content of C is 6-10%, preferably 7-9%, excellent
Select 8.1-8.5%.
In a preferred embodiment of the invention, by weight percentage, content≤0.04% of S, preferably≤0.03%,
It is preferred that≤0.02%.
Embodiment 1
A kind of smelting process of low-phosphorous high carbon ferro-chrome is present embodiments provided, steps are as follows:
(1) ingredient is distinguished according to the ratio that the mass ratio of chromite, semi-coke, coke and slag former is 100 ﹕, 3.3 ﹕, 7.7 ﹕ 6；
Wherein the fine ore of chromite is first soaked in calcium hydroxide in advance, impregnates 1-2h, then in 350 DEG C of dry 10min, then
Pretreated chromite is obtained then at 1100 DEG C of soaking 5min in 1000 DEG C of preheating 5min；
The slag former is lime stone.
(2) above-mentioned raw materials feeding is smelted into electric furnace, the temperature of smelting is 1610 DEG C, duration of heat 4h, smelting
During refining, adjusts secondary voltage and lower 8V, it is ensured that electrode does not move up, and moves up smelting reducing area not, finishing slag SiO2-CaO-
MgO-Al2O3Quaternary slag type.
(3) it comes out of the stove after the completion of smelting, gained clinker flows into water, the volume ratio of water and clinker is after the collection of transition packet
2:1；It comes out of the stove after the completion of smelting, gained grit is melted down as raw material to be smelted again；The size controlling of the clinker 5mm with
Under；It comes out of the stove after the completion of smelting, collects molten iron of coming out of the stove with iron packet, the volume of iron packet is 5m3, to hot-metal insulating, pressed in iron packet
The amount of 4kg/t molten iron releases molten iron from iron packet to Injection In Molten Iron graphite powder, and the time control that molten iron is released from iron packet exists
Molten iron is imported and carries out single casting in fixing mould by 10min, finishing, is carried out jigging using jigging machine in finishing, is obtained
High carbon ferro-chrome product；It is described to smelt, come out of the stove and be dusted respectively in casting process.
Embodiment 2
A kind of smelting process of low-phosphorous high carbon ferro-chrome is present embodiments provided, steps are as follows:
(1) ingredient is distinguished according to the ratio that the mass ratio of chromite, semi-coke, coke and slag former is 100 ﹕, 3 ﹕, 6 ﹕ 5；
Wherein the fine ore of chromite is first soaked in calcium hydroxide in advance, impregnates 1-2h, then in 350 DEG C of dry 10min, then
Pretreated chromite is obtained then at 1100 DEG C of soaking 5min in 1000 DEG C of preheating 5min；
The slag former is lime stone.
(2) above-mentioned raw materials feeding is smelted into electric furnace, the temperature of smelting is 1610 DEG C, duration of heat 4h, smelting
During refining, secondary voltage is adjusted, lowers secondary voltage 8V, finishing slag SiO2-CaO-MgO-Al2O3Quaternary slag type.
(3) it comes out of the stove after the completion of smelting, gained clinker flows into water, the volume ratio of water and clinker is after the collection of transition packet
2:1；It comes out of the stove after the completion of smelting, gained grit is melted down as raw material to be smelted again；The size controlling of the clinker 5mm with
Under；It comes out of the stove after the completion of smelting, collects molten iron of coming out of the stove with iron packet, the volume of iron packet is 5m3, to hot-metal insulating, pressed in iron packet
The amount of 4kg/t molten iron releases molten iron from iron packet to Injection In Molten Iron graphite powder, and the time control that molten iron is released from iron packet exists
Molten iron is imported and carries out single casting in fixing mould by 10min, finishing, is carried out jigging using jigging machine in finishing, is obtained
High carbon ferro-chrome product；It is described to smelt, come out of the stove and be dusted respectively in casting process.
Embodiment 3
A kind of smelting process of low-phosphorous high carbon ferro-chrome is present embodiments provided, steps are as follows:
(1) ingredient is distinguished according to the ratio that the mass ratio of chromite, semi-coke, coke and slag former is 100 ﹕, 4 ﹕, 9 ﹕ 10；
Wherein the fine ore of chromite is first soaked in calcium hydroxide in advance, impregnates 1-2h, then in 350 DEG C of dry 10min, then
Pretreated chromite is obtained then at 1100 DEG C of soaking 5min in 1000 DEG C of preheating 5min；
The slag former is lime stone.
(2) above-mentioned raw materials feeding is smelted into electric furnace, the temperature of smelting is 1610 DEG C, duration of heat 4h, smelting
During refining, secondary voltage 8V, finishing slag SiO are lowered2-CaO-MgO-Al2O3Quaternary slag type.
(3) it comes out of the stove after the completion of smelting, gained clinker flows into water, the volume ratio of water and clinker is after the collection of transition packet
2:1；It comes out of the stove after the completion of smelting, gained grit is melted down as raw material to be smelted again；The size controlling of the clinker 5mm with
Under；It comes out of the stove after the completion of smelting, collects molten iron of coming out of the stove with iron packet, the volume of iron packet is 5m3, to hot-metal insulating, pressed in iron packet
The amount of 4kg/t molten iron releases molten iron from iron packet to Injection In Molten Iron graphite powder, and the time control that molten iron is released from iron packet exists
Molten iron is imported and carries out single casting in fixing mould by 10min, finishing, is carried out jigging using jigging machine in finishing, is obtained
High carbon ferro-chrome product；It is described to smelt, come out of the stove and be dusted respectively in casting process.
Embodiment 4
A kind of smelting process of low-phosphorous high carbon ferro-chrome is present embodiments provided, steps are as follows:
(1) ingredient is distinguished according to the ratio that the mass ratio of chromite, semi-coke, coke and slag former is 100 ﹕, 3 ﹕, 9 ﹕ 7；
Wherein the fine ore of chromite is first soaked in calcium hydroxide in advance, impregnates 1-2h, then in 350 DEG C of dry 10min, then
Pretreated chromite is obtained then at 1100 DEG C of soaking 5min in 1000 DEG C of preheating 5min；
The slag former is lime stone.
(2) above-mentioned raw materials feeding is smelted into electric furnace, the temperature of smelting is 1610 DEG C, duration of heat 4h, smelting
During refining, secondary voltage 4V, finishing slag SiO are lowered2-CaO-MgO-Al2O3Quaternary slag type.
(3) it comes out of the stove after the completion of smelting, gained clinker flows into water, the volume ratio of water and clinker is after the collection of transition packet
2:1；It comes out of the stove after the completion of smelting, gained grit is melted down as raw material to be smelted again；The size controlling of the clinker 5mm with
Under；It comes out of the stove after the completion of smelting, collects molten iron of coming out of the stove with iron packet, the volume of iron packet is 5m3, to hot-metal insulating, pressed in iron packet
The amount of 4kg/t molten iron releases molten iron from iron packet to Injection In Molten Iron graphite powder, and the time control that molten iron is released from iron packet exists
Molten iron is imported and carries out single casting in fixing mould by 10min, finishing, is carried out jigging using jigging machine in finishing, is obtained
High carbon ferro-chrome product；It is described to smelt, come out of the stove and be dusted respectively in casting process.
Embodiment 5
A kind of smelting process of low-phosphorous high carbon ferro-chrome is present embodiments provided, steps are as follows:
(1) match respectively according to the ratio that the mass ratio of chromite, semi-coke, coke and slag former is 100 ﹕, 3.3 ﹕, 7.7 ﹕ 10
Material；
Wherein the fine ore of chromite is first soaked in calcium hydroxide in advance, impregnates 1-2h, then in 350 DEG C of dry 10min, then
Pretreated chromite is obtained then at 1100 DEG C of soaking 5min in 1000 DEG C of preheating 5min；
The slag former is the lime stone that mass ratio is 1 ﹕ 3 and silica mixing.
(2) above-mentioned raw materials feeding is smelted into electric furnace, the temperature of smelting is 1610 DEG C, duration of heat 4h, smelting
During refining, lower adjusting secondary voltage 4V, finishing slag SiO2-CaO-MgO-Al2O3Quaternary slag type.
(3) it comes out of the stove after the completion of smelting, gained clinker flows into water, the volume ratio of water and clinker is after the collection of transition packet
2:1；It comes out of the stove after the completion of smelting, gained grit is melted down as raw material to be smelted again；The size controlling of the clinker 5mm with
Under；It comes out of the stove after the completion of smelting, collects molten iron of coming out of the stove with iron packet, the volume of iron packet is 5m3, to hot-metal insulating, pressed in iron packet
The amount of 4kg/t molten iron releases molten iron from iron packet to Injection In Molten Iron graphite powder, and the time control that molten iron is released from iron packet exists
Molten iron is imported and carries out single casting in fixing mould by 10min, finishing, is carried out jigging using jigging machine in finishing, is obtained
High carbon ferro-chrome product；It is described to smelt, come out of the stove and be dusted respectively in casting process.
Embodiment 6
A kind of smelting process of low-phosphorous high carbon ferro-chrome is present embodiments provided, steps are as follows:
(1) ingredient is distinguished according to the ratio that the mass ratio of chromite, semi-coke, coke and slag former is 100 ﹕, 3.3 ﹕, 7.7 ﹕ 6；
Wherein the fine ore of chromite is first soaked in calcium hydroxide in advance, impregnates 1-2h, then in 350 DEG C of dry 10min, then
Pretreated chromite is obtained then at 1100 DEG C of soaking 5min in 1000 DEG C of preheating 5min；
The slag former is the lime stone that mass ratio is 1 ﹕ 1 and the mixing of magnesia material.
(2) above-mentioned raw materials feeding is smelted into electric furnace, the temperature of smelting is 1610 DEG C, duration of heat 4h, smelting
During refining, secondary voltage 4V, finishing slag SiO are lowered2-CaO-MgO-Al2O3Quaternary slag type.
(3) it comes out of the stove after the completion of smelting, gained clinker flows into water, the volume ratio of water and clinker is after the collection of transition packet
2:1；It comes out of the stove after the completion of smelting, gained grit is melted down as raw material to be smelted again；The size controlling of the clinker 5mm with
Under；It comes out of the stove after the completion of smelting, collects molten iron of coming out of the stove with iron packet, the volume of iron packet is 5m3, to hot-metal insulating, pressed in iron packet
The amount of 5kg/t molten iron releases molten iron from iron packet to Injection In Molten Iron graphite powder, and the time control that molten iron is released from iron packet exists
Molten iron is imported and carries out single casting in fixing mould by 10min, finishing, is carried out jigging using jigging machine in finishing, is obtained
High carbon ferro-chrome product；It is described to smelt, come out of the stove and be dusted respectively in casting process.
Embodiment 7
A kind of smelting process of low-phosphorous high carbon ferro-chrome is present embodiments provided, steps are as follows:
(1) ingredient is distinguished according to the ratio that the mass ratio of chromite, semi-coke, coke and slag former is 100 ﹕, 3.3 ﹕, 7.7 ﹕ 6；
Wherein the fine ore of chromite is first soaked in calcium hydroxide in advance, impregnates 1-2h, then in 350 DEG C of dry 10min, then
Pretreated chromite is obtained then at 1100 DEG C of soaking 5min in 1000 DEG C of preheating 5min；
The slag former is lime stone.
(2) above-mentioned raw materials feeding is smelted into electric furnace, the temperature of smelting is 1610 DEG C, duration of heat 4h, eventually
Slag is SiO2-CaO-MgO-Al2O3Quaternary slag type.
(3) it comes out of the stove after the completion of smelting, gained clinker flows into water, the volume ratio of water and clinker is after the collection of transition packet
2:1；It comes out of the stove after the completion of smelting, gained grit is melted down as raw material to be smelted again；The size controlling of the clinker 5mm with
Under；It comes out of the stove after the completion of smelting, collects molten iron of coming out of the stove with iron packet, the volume of iron packet is 5m3, to hot-metal insulating, pressed in iron packet
The amount of 5kg/t molten iron releases molten iron from iron packet to Injection In Molten Iron graphite powder, and the time control that molten iron is released from iron packet exists
Molten iron is imported and carries out single casting in fixing mould by 10min, finishing, is carried out jigging using jigging machine in finishing, is obtained
High carbon ferro-chrome product；It is described to smelt, come out of the stove and be dusted respectively in casting process.
Embodiment 8
The present embodiment is substantially the same manner as Example 1, and difference is only that: smelting temperature is 1580 DEG C, duration of heat 5h.
Embodiment 9
The present embodiment is substantially the same manner as Example 1, and difference is only that: smelting temperature is 1640 DEG C, duration of heat 3h.
Comparative example 1
1 reference implementation example 1 of comparative example, difference are that the ratio for adjusting chromite, semi-coke, coke and slag former is
100 ﹕, 3 ﹕, 9 ﹕ 12.
Comparative example 2
2 reference implementation example 1 of comparative example, difference are that the ratio for adjusting chromite, semi-coke, coke and slag former is
100 ﹕, 3 ﹕, 9 ﹕ 3.
Experimental example 1
For comparative illustration various embodiments of the present invention and the smelting process of comparative example, to the MgO/ of feed stock for blast furnace in smelting
Al2O3When finishing slag basicity is tested, specific test result is as follows table 1.Wherein, it is not adjusted in embodiment 7 in secondary voltage
It is whole, production capacity is affected to a certain extent.
The MgO/Al of the feed stock for blast furnace of the different smelting processes of table 12O3When finishing slag basicity table
For comparative illustration various embodiments of the present invention and the smelting process of comparative example, each embodiment and comparative example are prepared into
To the Contents of Main Components of low-phosphorous high carbon ferro-chrome tested, specific test result is as follows table 2.
The product composition test result of the different smelting processes of table 2 (surplus is Fe and inevitable impurity)
| Number | Cr/% | Si/% | C/% | P/% | S/% |
| Embodiment 1 | 57.97 | 2.31 | 8.32 | 0.008 | 0.02 |
| Embodiment 2 | 56.73 | 2.16 | 8.11 | 0.011 | 0.03 |
| Embodiment 3 | 58.16 | 2.75 | 8.47 | 0.010 | 0.03 |
| Embodiment 4 | 58.03 | 2.49 | 8.28 | 0.011 | 0.03 |
| Embodiment 5 | 57.63 | 2.37 | 8.16 | 0.014 | 0.04 |
| Embodiment 6 | 57.57 | 2.32 | 8.21 | 0.015 | 0.04 |
| Embodiment 7 | 55.34 | 2.13 | 8.11 | 0.012 | 0.04 |
| Embodiment 8 | 56.43 | 2.25 | 8.26 | 0.012 | 0.03 |
| Embodiment 9 | 58.13 | 2.36 | 8.34 | 0.013 | 0.04 |
| Comparative example 1 | 55.34 | 1.04 | 8.62 | 0.08 | 0.08 |
| Comparative example 2 | 53.21 | 1.12 | 8.75 | 0.09 | 0.08 |
By upper table 1 and 2 it is found that the present invention passes through synchronous adjustment basicity, slag type, enters furnace magnalium ratio and smelting temperature etc.,
It improves the dephosphorizing capacity of clinker and increases the distribution coefficient of phosphorus, obtain low-phosphorous high carbon ferro-chrome, the mechanics for improving high carbon ferro-chrome is mechanical
Intensity meets the use demand of special steel；And the smelting hot-zone of caused electric arc furnaces under the conditions of high alkalinity is avoided to move up simultaneously,
Caused by operation difficulty it is big, the problem of production and technical indication difference.Product quality, technical indicator and production cost etc. are taken into account.
And the present invention can be effectively improved the recovery rate of metallic element, be increased economic efficiency by above-mentioned regulation method.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (23)
1. a kind of smelting process of low-phosphorous high carbon ferro-chrome, which comprises the steps of:
It is smelted using chromite, coke, semi-coke and slag former as primary raw material, makes finishing slag SiO2-CaO-MgO-Al2O3Four
First slag type, the basicity of finishing slag are 1.4-1.5；
The MgO/Al of the raw material2O3Ratio be 0.95-1.05；
The finishing slag includes SiO by mass percentage226-32%, CaO 7-12%, MgO 28-34% and Al2O3 22-
28%；
The chromite, semi-coke, coke and slag former mass ratio be 100 ﹕ (3-4) ﹕ (7-9) ﹕ (5-10)；
It will be smelted again after chromite pretreatment, the pretreated method includes: to be soaked in chromite in advance to disappear
It is handled in limewash；After immersion, chromite is dried, is preheated, homogeneous heat treatment；The condition of the drying are as follows: dry
Temperature is 300-400 DEG C, drying time 10-15min；The condition of the preheating are as follows: preheating temperature is 1000-1100 DEG C, in advance
Hot time 5-10min；The condition of the soaking are as follows: 1100-1150 DEG C, soaking time 5-8min；
The temperature of the smelting is 1610 ± 10 DEG C, and the time of the smelting is 3-5h.
2. the smelting process of low-phosphorous high carbon ferro-chrome according to claim 1, which is characterized in that the chromite, semi-coke, coke
The mass ratio of charcoal and slag former is 100 ﹕ (3.2-3.6) ﹕ (7.6-8.4) ﹕ (6-7).
3. the smelting process of low-phosphorous high carbon ferro-chrome according to claim 2, which is characterized in that the matter of the semi-coke and coke
Amount is than being 1 ﹕ (2-3).
4. the smelting process of low-phosphorous high carbon ferro-chrome according to claim 3, which is characterized in that the matter of the semi-coke and coke
Amount is than being 3 ﹕ 7.
5. the smelting process of low-phosphorous high carbon ferro-chrome according to claim 2, which is characterized in that in the chromite, MgO and
Al2O3The sum of mass percent≤25%.
6. the smelting process of low-phosphorous high carbon ferro-chrome according to claim 5, which is characterized in that in the chromite, Cr2O3
With mass ratio >=2 of FeO.
7. the smelting process of low-phosphorous high carbon ferro-chrome according to claim 1, which is characterized in that the slag former includes lime
Stone and/or silica.
8. the smelting process of low-phosphorous high carbon ferro-chrome according to claim 1, which is characterized in that the time of the smelting is
4h。
9. the smelting process of low-phosphorous high carbon ferro-chrome according to claim 1, which is characterized in that come out of the stove, use after the completion of smelting
Iron packet collects molten iron of coming out of the stove and carries out Carburization Treatment in iron packet to hot-metal insulating, and molten iron is released from iron packet, casts, and finishing obtains
To low-phosphorous high carbon ferro-chrome.
10. the smelting process of low-phosphorous high carbon ferro-chrome according to claim 9, which is characterized in that Carburization Treatment includes to iron
Carburant is sprayed in water.
11. the smelting process of low-phosphorous high carbon ferro-chrome according to claim 10, which is characterized in that the dosage of the carburant
For 2-5kg/t molten iron.
12. the smelting process of low-phosphorous high carbon ferro-chrome according to claim 11, which is characterized in that the carburant includes stone
Ink powder；The partial size of the graphite powder is 300-400 mesh.
13. the smelting process of low-phosphorous high carbon ferro-chrome according to claim 1, which is characterized in that the low-phosphorous height smelted
Include following component in carbon ferrochrome:
By weight percentage, Cr 55-60%, Si≤3.0%, C 4-10%, P≤0.02%, S≤0.04%, remaining is for iron and not
Evitable impurity.
14. the smelting process of low-phosphorous high carbon ferro-chrome according to claim 13, which is characterized in that the low-phosphorous height smelted
In carbon ferrochrome, by weight percentage, content≤0.012% of P.
15. the smelting process of low-phosphorous high carbon ferro-chrome according to claim 14, which is characterized in that the low-phosphorous height smelted
In carbon ferrochrome, by weight percentage, the content 0.010% of P.
16. the smelting process of low-phosphorous high carbon ferro-chrome according to claim 13, which is characterized in that the low-phosphorous height smelted
In carbon ferrochrome, by weight percentage, the content of Cr is 56.5-58.7%.
17. the smelting process of low-phosphorous high carbon ferro-chrome according to claim 16, which is characterized in that the low-phosphorous height smelted
In carbon ferrochrome, by weight percentage, the content of Cr is 57-58%.
18. the smelting process of low-phosphorous high carbon ferro-chrome according to claim 13, which is characterized in that the low-phosphorous height smelted
In carbon ferrochrome, by weight percentage, content≤2.8% of Si.
19. the smelting process of low-phosphorous high carbon ferro-chrome according to claim 18, which is characterized in that the low-phosphorous height smelted
In carbon ferrochrome, by weight percentage, content≤2.5% of Si.
20. the smelting process of low-phosphorous high carbon ferro-chrome according to claim 13, which is characterized in that the low-phosphorous height smelted
In carbon ferrochrome, by weight percentage, the content of C is 7-9%.
21. the smelting process of low-phosphorous high carbon ferro-chrome according to claim 20, which is characterized in that the low-phosphorous height smelted
In carbon ferrochrome, by weight percentage, the content of C is 8.1-8.5%.
22. the smelting process of low-phosphorous high carbon ferro-chrome according to claim 13, which is characterized in that the low-phosphorous height smelted
In carbon ferrochrome, by weight percentage, content≤0.03% of S.
23. the smelting process of low-phosphorous high carbon ferro-chrome according to claim 13, which is characterized in that the low-phosphorous height smelted
In carbon ferrochrome, by weight percentage, content≤0.02% of S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810901996.1A CN109097651B (en) | 2018-08-09 | 2018-08-09 | A kind of low-phosphorous high carbon ferro-chrome and its smelting process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810901996.1A CN109097651B (en) | 2018-08-09 | 2018-08-09 | A kind of low-phosphorous high carbon ferro-chrome and its smelting process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109097651A CN109097651A (en) | 2018-12-28 |
| CN109097651B true CN109097651B (en) | 2019-06-28 |
Family
ID=64849288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810901996.1A Active CN109097651B (en) | 2018-08-09 | 2018-08-09 | A kind of low-phosphorous high carbon ferro-chrome and its smelting process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109097651B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109735676B (en) * | 2019-03-19 | 2020-11-24 | 山西太钢不锈钢股份有限公司 | Production method of low-phosphorus chromium-containing molten iron |
| KR102483106B1 (en) * | 2019-04-11 | 2023-01-02 | 닛폰세이테츠 가부시키가이샤 | High-efficiency molten iron alloy refining method |
| CN114262832A (en) * | 2021-12-21 | 2022-04-01 | 徐州宏阳新材料科技股份有限公司 | Refining and impurity removing method for ferrochrome |
| CN114214553A (en) * | 2021-12-21 | 2022-03-22 | 徐州宏阳新材料科技股份有限公司 | Refining method of high-carbon ferrochrome |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105112663A (en) * | 2015-08-24 | 2015-12-02 | 中冶东方工程技术有限公司 | Combined production process for high-carbon ferro-chrome and semi-coke |
| CN107012393A (en) * | 2017-06-01 | 2017-08-04 | 山东寿光巨能特钢有限公司 | The production method of carbon chromium steel in a kind of inexpensive high-hardenability |
| CN107267854A (en) * | 2017-06-19 | 2017-10-20 | 徐州宏阳新材料科技有限公司 | The smelting process and product of a kind of high carbon ferro-chrome |
| CN107354365A (en) * | 2017-07-27 | 2017-11-17 | 江苏省冶金设计院有限公司 | Ferroalloy smelting auxiliary agent and its application process |
-
2018
- 2018-08-09 CN CN201810901996.1A patent/CN109097651B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105112663A (en) * | 2015-08-24 | 2015-12-02 | 中冶东方工程技术有限公司 | Combined production process for high-carbon ferro-chrome and semi-coke |
| CN107012393A (en) * | 2017-06-01 | 2017-08-04 | 山东寿光巨能特钢有限公司 | The production method of carbon chromium steel in a kind of inexpensive high-hardenability |
| CN107267854A (en) * | 2017-06-19 | 2017-10-20 | 徐州宏阳新材料科技有限公司 | The smelting process and product of a kind of high carbon ferro-chrome |
| CN107354365A (en) * | 2017-07-27 | 2017-11-17 | 江苏省冶金设计院有限公司 | Ferroalloy smelting auxiliary agent and its application process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109097651A (en) | 2018-12-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109097651B (en) | A kind of low-phosphorous high carbon ferro-chrome and its smelting process | |
| CN108977678B (en) | A kind of low-Ti high-C ferrochronium and its smelting process | |
| CN102260822B (en) | Smelting method of high-phosphorus low-sulfur non-oriented electrical steel | |
| CN108085577B (en) | A kind of smelting process improving ton steel scrap ratio | |
| CN110129517B (en) | Method for smelting high-silicon iron water based on converter duplex method to improve dephosphorization rate of desiliconization furnace | |
| CN100507022C (en) | Method for AOD whole melted iron directly smelting austenitic stainless steel | |
| CN101555565B (en) | Process for producing vermicular cast iron by cupola-line frequency furnace duplex melting | |
| CN108085602B (en) | A kind of rolling processing method of abrasion-proof steel ball steel and the steel ball | |
| CN106086298B (en) | A kind of smelting process of low-phosphorous-low titanium-low-sulfur steel | |
| CN107267854A (en) | The smelting process and product of a kind of high carbon ferro-chrome | |
| CN102010934A (en) | RH refining desulphurization process of non-oriented electrical steel | |
| CN102936689A (en) | High-temperature-resistant bearing steel and production process thereof | |
| CN105603156A (en) | Production method for IF steel containing ultralow sulfur | |
| CN110117689A (en) | A method of based on high-silicon molten iron converter double slag process low phosphorus steel by smelting | |
| CN109554605A (en) | A kind of Control on Oxide Inclusions method of LD-RH technique production ultra-low-carbon steel | |
| CN105132611B (en) | Method for producing ultra-low phosphorous steel through single slag of converter | |
| CN105861781B (en) | Method for refining silicon killed steel by ANS-OB process | |
| CN107868858A (en) | Production method of low-sulfur low-phosphorus steel | |
| CN104531940A (en) | Converter final slag thickening method | |
| CN102277532A (en) | Cold working mold steel Cr8 and production method thereof | |
| CN102465239B (en) | Method for increasing sulfur yield of high sulfur stainless steel | |
| CN109439842A (en) | The production method of motor pawl machine AISI1006 steel | |
| CN104946845A (en) | Method for producing high-carbon-chrome bearing steel from vanadium-titanium-containing molten iron | |
| CN113684420A (en) | Calcium-tellurium-rare earth composite treated super free-cutting stainless steel and preparation method thereof | |
| CN108315647B (en) | Grinding ball steel material and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 221000 Datun Street Office Industrial Park, Peixian County, Xuzhou City, Jiangsu Province Patentee after: Xuzhou Hongyang New Material Technology Co.,Ltd. Address before: 221000 Datun Street Office Industrial Park, Peixian County, Xuzhou City, Jiangsu Province Patentee before: XUZHOU HONGYANG NEW MATERIAL TECHNOLOGY CO.,LTD. |
|
| CP01 | Change in the name or title of a patent holder |