CN101892352B - Arc furnace deep dephosphorization technology and deep dephosphorization agent thereof - Google Patents
Arc furnace deep dephosphorization technology and deep dephosphorization agent thereof Download PDFInfo
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- CN101892352B CN101892352B CN2010102368325A CN201010236832A CN101892352B CN 101892352 B CN101892352 B CN 101892352B CN 2010102368325 A CN2010102368325 A CN 2010102368325A CN 201010236832 A CN201010236832 A CN 201010236832A CN 101892352 B CN101892352 B CN 101892352B
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- 238000005516 engineering process Methods 0.000 title claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 117
- 239000010959 steel Substances 0.000 claims abstract description 117
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 75
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 75
- 239000004571 lime Substances 0.000 claims abstract description 75
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 57
- 239000002893 slag Substances 0.000 claims abstract description 55
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 34
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 18
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 18
- 239000011574 phosphorus Substances 0.000 claims abstract description 18
- 230000000694 effects Effects 0.000 claims abstract description 16
- 238000002844 melting Methods 0.000 claims abstract description 14
- 230000008018 melting Effects 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 33
- 238000010891 electric arc Methods 0.000 claims description 26
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 18
- 239000001301 oxygen Substances 0.000 claims description 18
- 229910052760 oxygen Inorganic materials 0.000 claims description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 16
- 229910052799 carbon Inorganic materials 0.000 claims description 16
- 239000000470 constituent Substances 0.000 claims description 16
- 239000000428 dust Substances 0.000 claims description 16
- 229910052742 iron Inorganic materials 0.000 claims description 16
- 239000007921 spray Substances 0.000 claims description 16
- 229940067573 brown iron oxide Drugs 0.000 claims description 9
- 239000012535 impurity Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 238000002360 preparation method Methods 0.000 claims description 9
- 235000006679 Mentha X verticillata Nutrition 0.000 claims description 8
- 235000002899 Mentha suaveolens Nutrition 0.000 claims description 8
- 235000001636 Mentha x rotundifolia Nutrition 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- 230000002787 reinforcement Effects 0.000 claims description 8
- 239000000155 melt Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 7
- 238000010079 rubber tapping Methods 0.000 abstract description 6
- 239000000843 powder Substances 0.000 abstract description 3
- 239000008187 granular material Substances 0.000 abstract 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 19
- 239000000292 calcium oxide Substances 0.000 description 18
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 17
- 238000003723 Smelting Methods 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000000395 magnesium oxide Substances 0.000 description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000036284 oxygen consumption Effects 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 229960001866 silicon dioxide Drugs 0.000 description 2
- -1 Paris white Substances 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- WNQQFQRHFNVNSP-UHFFFAOYSA-N [Ca].[Fe] Chemical compound [Ca].[Fe] WNQQFQRHFNVNSP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000009845 electric arc furnace steelmaking Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 229910052839 forsterite Inorganic materials 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention relates to arc furnace deep dephosphorization technology and a deep dephosphorization agent thereof. The arc furnace deep dephosphorization technology comprises the following steps of: melting steel by using slag, performing deep dephosphorization and preparing foamed slag, and is characterized in that lime and the deep dephosphorization agent are added after the addition of scrap steel and before complete melting of the scrap steel in parts so as to enhance the deep dephosphorization effect. The deep dephosphorization agent consists of the following components in percentage by weight: 25 to 40 percent of lime, and 60 to 75 percent of ferric oxide powder. The method for preparing the dephosphorization agent comprises the following steps of: smashing the raw materials into 100 to 150 meshes and uniformly mixing; and premelting the materials at the high temperature of between 1,200 and 1,550 DEG C, cooling and processing into granules with the diameter of 3 to 50 mm. Compared with the prior art, the invention has the advantages that: the deep dephosphorization technology and the deep dephosphorization agent are adopted for deep dephosphorization, the lime is not added before charging, and the lime and the deep dephosphorization agent are added after charging and before complete melting of the materials in parts to enhance the deep dephosphorization effect, so that the tapping phosphorus is reduced to 0.0030 percent or even lower.
Description
Technical field
The present invention relates to the steelmaking technical field of ferrous metallurgy technology, relate in particular to a kind of electric arc furnace deep dephosphorization technology and deep dephosphorization agent thereof.
Background technology
Along with electric-arc furnace steelmaking is popularized gradually, ultra high power, furnace wall oxygen blast and high efficiency continuous casting are the directions of electric arc furnace development, also have part steel mill to adopt molten iron to mix use with steel scrap, all shortened the smelting cycle of electric arc furnace, make in the metallurgical function of electric arc furnace compactly more, need in very short time, finish decarburization, dephosphorization function; In addition, the steel grade of electric arc furnace smelting develops towards high-grade, precision and advanced direction day by day, harmful element in the steel and inclusion is required strictness more, therefore, under low-phosphorous steel grade (P≤0.008%) and extremely low-phosphorous steel grade (P≤0.004%) requirement, arc furnace tapping phosphorus requires less than 0.0030% even lower.
Traditional electric arc furnace dephosphorization is relatively slow, and desiliconization, dephosphorization, each operation of decarburization distribute apparent in view, especially deep dephosphorization, can significantly increase tap to tap time, at first carry out the molten steel desiliconization, begin dephosphorization then, dephosphorizing agent mainly is to use lime, fluorite and common iron scale.Use along with ultra-high power electric arc furnace and wall lance, the boundary of desiliconization and dephosphorization has not been very clear, therefore, for ultra-high power electric arc furnace, traditional dephosphorization technology and dephosphorizing agent can not meet the demands, must develop the requirement that new dephosphorization technology and dephosphorizing agent thereof satisfy High-efficient Production, especially satisfy the requirement of deep dephosphorization.
A kind of furnace dephosphorus rod agent for electric furnace molten steel of the prior art, application number: 200610020189.6, it adds 5% water by brown iron oxide, forsterite powder, Paris white, clay powder, boric acid, starch after by the certain weight ratio mixing and stirring, make the hollow stylus product of Different Weight specification with mould, dephosphorization effect only is to make the limit phosphorus amount of molten steel improve a grade by international standard; In addition, under big industrial condition, the use of this stylus has been subjected to tangible restriction.
A kind of Dephosphorising agent for converter of the prior art and preparation method thereof, application number: 200610026164.7, it is characterized in that this Dephosphorising agent for converter is made up of following component by weight percentage: ferric oxide (Fe
2O
3) 40%～60%, calcium oxide (CaO) 30%～50%, alchlor (Al
2O
3) 1%～10%, silicon-dioxide (SiO
2) 1%～10%, magnesium oxide (MgO) 0.1%～10%, the component of above-mentioned Dephosphorising agent for converter is pulverized, is mixed, through 1000 ℃～1550 ℃ fritting, generate the iron calcium aluminate, the cooling post-treatment becomes the granular Dephosphorising agent for converter of 3～50mm.The present invention is to provide the coverter pig dephosphorizing agent, this dephosphorizing agent may not be fit to the electric arc furnace smelting requirement, requires from composition, contains alchlor (Al
2O
3) 1%～10%, silicon-dioxide (SiO
2) 1%～10%, magnesium oxide (MgO) 0.1%～10%, certainly will influence basicity of slag, reduce dephosphorization efficient.
A kind of converter smelting process that uses dephosphorizing agent of the prior art, application number: 200910077085.2, be in same block converter, utilize the thermodynamics that low temperature and high oxidation iron etc. are good in earlier stage and blow mechanical condition again, and use contains a small amount of CaCl
2CaO base dephosphorizing agent carry out dephosphorization, early stage, hot metal pretreatment was outwelled 50-70% desiliconization, dephosphorized slag, the later stage is slag making again, carries out carbonization treatment, decarbonized slag stays the slag utilization, can be used as down the dephosphorization slag of stove.This smelting technology utilizes CaCl
2Eutectoid point character with the CaO two component system, it is added in the CaO base dephosphorizing agent, accelerated the burn-off rate of CaO, improved the utilization ratio of lime, simultaneously decarbonized slag stays slag operation, both made full use of the physics heat that slag brought, again for early stage dephosphorization high oxidation iron is provided, quicken dephosphorisation reaction.Twice slag making of this process using is actually " double slag process ", and be different with the present invention, and slag making does not have clear and definite boundary on the electric arc furnace, and in addition, this technology is not clear and definite to dephosphorization effect.Because electric arc furnace compares with converter, oxygen delivery capacity a little less than, need the high oxidation iron substance to carry out dephosphorization, this technology is not added the high oxidation iron substance.
Summary of the invention
The purpose of this invention is to provide a kind of electric arc furnace deep dephosphorization technology and deep dephosphorization agent thereof, at the electric arc furnace smelting characteristics, realize deep dephosphorization, terminal point phosphorus reaches below 0.0030%.
In order to address the above problem, the present invention by the following technical solutions:
A kind of electric arc furnace deep dephosphorization technology comprises stream scorification steel, deep dephosphorization, making foamed slag, it is characterized in that, gradation adds lime and deep dephosphorization agent before melting fully to steel scrap after adding steel scrap, reinforcement deep dephosphorization effect, and its operation steps is as follows:
1) after adding all steel scraps, add lime 18～22kg/t steel, treat in the stove on the top of the slag behind the scrap melting, bleed off 50～80% of slag in the stove, add lime 18～22kg/t steel and deep dephosphorization agent 6～8kg/t steel after the slagging again;
2) steel scrap melts preceding 3～5min fully and adds lime 18～22kg/t steel and deep dephosphorization agent 2～4kg/t steel once more in the stove;
3) the molten clear back of furnace charge whole process is carried out the foamy slag operation, adopts spray carbon dust and oxygen blast to carry out making foamed slag, spray carbon dust amount 3～10kg/t steel, oxygen blast intensity 1.5～5Nm
3/ mint steel, when phosphorus content in the molten steel reaches 0.0030% when following, deep dephosphorization finishes;
The deep dephosphorization agent of described a kind of electric arc furnace deep dephosphorization technology, form according to weight percent by lime, brown iron oxide:
Lime 25%～40%
Ferric oxide 60%～75%
Effective constituent CaO in the described lime 〉=93%, active in 300ml, the effective constituent Fe in the ferric oxide
2O
3〉=98%;
Its preparation method is: after being crushed to 100～150 orders, mixing, fritting under 1200 ℃～1550 ℃ high temperature after its cooling, is processed into 3～50mm particle with above-mentioned raw materials;
Composition requirement after the fritting, CaO 30%～45%, Fe
2O
3+ FeO 55%～70%, and all the other are inevitable impurity.
Compared with prior art, the invention has the beneficial effects as follows: 1) on ultra-high power electric arc furnace, adopt deep dephosphorization technology and deep dephosphorization agent to carry out deep dephosphorization, do not add lime before reinforced, gradation adds lime and deep dephosphorization agent before melt extremely fully reinforced back, replenish a large amount of high oxidation iron substances, strengthen dephosphorization effect, make tapping phosphorus be reduced to 0.0030% even lower; 2) impurity that influences basicity of slag still less, very faint to the influence of basicity, improved dephosphorization efficient, by this dephosphorization technology, can effectively reduce lime consumption, reduce the oxygen consumption, saves energy is shortened the heat.
Embodiment
The invention will be further described below in conjunction with embodiment:
The 100t ultra-high power electric arc furnace of 5 wall lances is arranged is example with interior:
Embodiment 1
A kind of electric arc furnace deep dephosphorization technology comprises stream scorification steel, deep dephosphorization, making foamed slag, does not add lime before adding steel scrap, and gradation adds lime and deep dephosphorization agent to the fusing fully after adding steel scrap, reinforcement deep dephosphorization effect, and its operation steps is as follows:
1) after adding all steel scraps, add lime 18kg/t steel, treat in the stove on the top of the slag behind the scrap melting, bleed off 50% of slag in the stove, add lime 18kg/t steel and deep dephosphorization agent 6kg/t steel after the slagging again;
2) 3min added lime 18kg/t steel and deep dephosphorization agent 2kg/t steel once more before steel scrap melted fully in the stove;
3) the molten clear back of furnace charge whole process is carried out the foamy slag operation, adopts spray carbon dust and oxygen blast to carry out making foamed slag, spray carbon dust amount 3kg/t steel, oxygen blast intensity 2.0Nm
3/ mint steel, when phosphorus content in the molten steel reaches 0.0030% when following, deep dephosphorization finishes;
The present invention's deep dephosphorization agent is made up of according to weight percent lime, brown iron oxide: lime 25%; Ferric oxide 75%, the effective constituent CaO in the described lime 〉=93%, active in 300ml, the effective constituent Fe in the ferric oxide
2O
3〉=98%; Its preparation method is: after being crushed to 100～150 orders, mixing, fritting under 1250 ℃ of high temperature after its cooling, is processed into 3～50mm particle with above-mentioned raw materials; Composition after the fritting, CaO:23%, Fe
2O
3+ FeO:73%, all the other are inevitable impurity.
Embodiment 2
A kind of electric arc furnace deep dephosphorization technology comprises stream scorification steel, deep dephosphorization, making foamed slag, does not add lime before adding steel scrap, and gradation adds lime and deep dephosphorization agent to the fusing fully after adding steel scrap, reinforcement deep dephosphorization effect, and its operation steps is as follows:
1) after adding all steel scraps, add lime 20kg/t steel, treat in the stove on the top of the slag behind the scrap melting, bleed off 50% of slag in the stove, add lime 20kg/t steel and deep dephosphorization agent 6kg/t steel after the slagging again;
2) 3min added lime 20kg/t steel and deep dephosphorization agent 2kg/t steel once more before material melted fully in the stove;
3) the molten clear back of furnace charge whole process is carried out the foamy slag operation, adopts spray carbon dust and oxygen blast to carry out making foamed slag, spray carbon dust amount 3kg/t steel, oxygen blast intensity 2.5Nm
3/ mint steel, when phosphorus content in the molten steel reaches 0.0030% when following, deep dephosphorization finishes;
The present invention's deep dephosphorization agent is made up of according to weight percent lime, brown iron oxide: lime 28%; Ferric oxide 72%, the effective constituent CaO in the described lime 〉=93%, active in 300ml, the effective constituent Fe in the ferric oxide
2O
3〉=98%; Its preparation method is: after being crushed to 100～150 orders, mixing, fritting under 1250 ℃ of high temperature after its cooling, is processed into 3～50mm particle with above-mentioned raw materials; Composition after the fritting, CaO:26%, Fe
2O
3+ FeO:70%, all the other are inevitable impurity.
Embodiment 3
A kind of electric arc furnace deep dephosphorization technology comprises stream scorification steel, deep dephosphorization, making foamed slag, does not add lime before adding steel scrap, and gradation adds lime and deep dephosphorization agent to the fusing fully after adding steel scrap, reinforcement deep dephosphorization effect, and its operation steps is as follows:
1) after adding all steel scraps, add lime 22kg/t steel, treat in the stove on the top of the slag behind the scrap melting, bleed off 50% of slag in the stove, add lime 22kg/t steel and deep dephosphorization agent 6kg/t steel after the slagging again;
2) 3min added lime 22kg/t steel and deep dephosphorization agent 2kg/t steel once more before material melted fully in the stove;
3) the molten clear back of furnace charge whole process is carried out the foamy slag operation, adopts spray carbon dust and oxygen blast to carry out making foamed slag, spray carbon dust amount 5kg/t steel, oxygen blast intensity 2.0Nm
3/ mint steel, when phosphorus content in the molten steel reaches 0.0030% when following, deep dephosphorization finishes;
The present invention's deep dephosphorization agent is made up of according to weight percent lime, brown iron oxide: lime 30%; Ferric oxide 70%, the effective constituent CaO in the described lime 〉=93%, active in 300ml, the effective constituent Fe in the ferric oxide
2O
3〉=98%; Its preparation method is: after being crushed to 100～150 orders, mixing, fritting under 1250 ℃ of high temperature after its cooling, is processed into 3～50mm particle with above-mentioned raw materials; Composition after the fritting, CaO:28%, Fe
2O
3+ FeO:67%, all the other are inevitable impurity.
Embodiment 4
A kind of electric arc furnace deep dephosphorization technology comprises stream scorification steel, deep dephosphorization, making foamed slag, does not add lime before adding steel scrap, and gradation adds lime and deep dephosphorization agent to the fusing fully after adding steel scrap, reinforcement deep dephosphorization effect, and its operation steps is as follows:
1) after adding all steel scraps, add lime 18kg/t steel, treat in the stove on the top of the slag behind the scrap melting, bleed off 50% of slag in the stove, add lime 18kg/t steel and deep dephosphorization agent 8kg/t steel after the slagging again;
2) 3min added lime 18kg/t steel and deep dephosphorization agent 4kg/t steel once more before material melted fully in the stove;
3) the molten clear back of furnace charge whole process is carried out the foamy slag operation, adopts spray carbon dust and oxygen blast to carry out making foamed slag, spray carbon dust amount 5kg/t steel, oxygen blast intensity 2.5Nm
3/ mint steel, when phosphorus content in the molten steel reaches 0.0030% when following, deep dephosphorization finishes;
The present invention's deep dephosphorization agent is made up of according to weight percent lime, brown iron oxide: lime 32%; Ferric oxide 68%, the effective constituent CaO in the described lime 〉=93%, active in 300ml, the effective constituent Fe in the ferric oxide
2O
3〉=98%; Its preparation method is: after being crushed to 100～150 orders, mixing, fritting under 1250 ℃ of high temperature after its cooling, is processed into 3～50mm particle with above-mentioned raw materials; Composition after the fritting, CaO:30%, Fe
2O
3+ FeO:67%, all the other are inevitable impurity.
Embodiment 5
A kind of electric arc furnace deep dephosphorization technology comprises stream scorification steel, deep dephosphorization, making foamed slag, does not add lime before adding steel scrap, and gradation adds lime and deep dephosphorization agent to the fusing fully after adding steel scrap, reinforcement deep dephosphorization effect, and its operation steps is as follows:
1) after adding all steel scraps, add lime 20kg/t steel, treat in the stove on the top of the slag behind the scrap melting, bleed off 50% of slag in the stove, add lime 20kg/t steel and deep dephosphorization agent 8kg/t steel after the slagging again;
2) 3min added lime 20kg/t steel and deep dephosphorization agent 4kg/t steel once more before material melted fully in the stove;
3) the molten clear back of furnace charge whole process is carried out the foamy slag operation, adopts spray carbon dust and oxygen blast to carry out making foamed slag, spray carbon dust amount 4kg/t steel, oxygen blast intensity 2.0Nm
3/ mint steel, when phosphorus content in the molten steel reaches 0.0030% when following, deep dephosphorization finishes;
The present invention's deep dephosphorization agent is made up of according to weight percent lime, brown iron oxide: lime 35%; Ferric oxide 65%, the effective constituent CaO in the described lime 〉=93%, active in 300ml, the effective constituent Fe in the ferric oxide
2O
3〉=98%; Its preparation method is: after being crushed to 100～150 orders, mixing, fritting under 1250 ℃ of high temperature after its cooling, is processed into 3～50mm particle with above-mentioned raw materials; Composition after the fritting, CaO:33%, Fe
2O
3+ FeO:62%, all the other are inevitable impurity.
Embodiment 6
A kind of electric arc furnace deep dephosphorization technology comprises stream scorification steel, deep dephosphorization, making foamed slag, does not add lime before adding steel scrap, and gradation adds lime and deep dephosphorization agent to the fusing fully after adding steel scrap, reinforcement deep dephosphorization effect, and its operation steps is as follows:
1) after adding all steel scraps, add lime 22kg/t steel, treat in the stove on the top of the slag behind the scrap melting, bleed off 50% of slag in the stove, add lime 22kg/t steel and deep dephosphorization agent 8kg/t steel after the slagging again;
2) 3min added lime 22kg/t steel and deep dephosphorization agent 4kg/t steel once more before material melted fully in the stove;
3) the molten clear back of furnace charge whole process is carried out the foamy slag operation, adopts spray carbon dust and oxygen blast to carry out making foamed slag, spray carbon dust amount 4kg/t steel, oxygen blast intensity 2.5Nm
3/ mint steel, when phosphorus content in the molten steel reaches 0.0030% when following, deep dephosphorization finishes;
The present invention's deep dephosphorization agent is made up of according to weight percent lime, brown iron oxide: lime 40%; Ferric oxide 60%, the effective constituent CaO in the described lime 〉=93%, active in 300ml, the effective constituent Fe in the ferric oxide
2O
3〉=98%; Its preparation method is: after being crushed to 100～150 orders, mixing, fritting under 1250 ℃ of high temperature after its cooling, is processed into 3～50mm particle with above-mentioned raw materials; Composition after the fritting, CaO:38%, Fe
2O
3+ FeO:57%, all the other are inevitable impurity.
In the foregoing description, do not add lime before adding steel scrap, gradation adds lime and deep dephosphorization agent before melting fully to steel scrap after adding steel scrap, replenish a large amount of high oxidation iron substances, strengthen dephosphorization effect, make tapping phosphorus be reduced to 0.0030% even lower, dephosphorization effect contrasts as following table 1:
Table 1: dephosphorization effect contrast
| The embodiment group | Original phosphorus % | Tapping phosphorus % | The embodiment group | Original phosphorus % | Tapping phosphorus % |
| 1 | 0.037 | 0.0025 | 4 | 0.031 | 0.0021 |
| 2 | 0.035 | 0.0018 | 5 | 0.036 | 0.0028 |
| 3 | 0.034 | 0.0024 | 6 | 0.037 | 0.0022 |
The present invention simultaneously reduces 6min tap to tap time compared to existing technology, and power consumption reduces by 34 degree/t steel, and the oxygen consumption reduces 14Nm
3/ t steel, lime reduces the 31kg/t steel, effectively reduces lime consumption, has reduced the oxygen consumption, has saved electric energy, has shortened tap to tap time, obvious economic.
Claims (1)
1. electric arc furnace deep dephosphorization technology comprises stream scorification steel, deep dephosphorization, making foamed slag, it is characterized in that, gradation adds lime and deep dephosphorization agent before melting fully to steel scrap after adding steel scrap, reinforcement deep dephosphorization effect, and its operation steps is as follows:
1) after adding all steel scraps, add lime 18～22kg/t steel, treat in the stove on the top of the slag behind the scrap melting, bleed off 50～80% of slag in the stove, add lime 18～22kg/t steel and deep dephosphorization agent 6～8kg/t steel after the slagging again;
2) steel scrap melts preceding 3～5min fully and adds lime 18～22kg/t steel and deep dephosphorization agent 2～4kg/t steel once more in the stove;
3) the molten clear back of furnace charge whole process is carried out the foamy slag operation, adopts spray carbon dust and oxygen blast to carry out making foamed slag, spray carbon dust amount 3～10kg/t steel, oxygen blast intensity 1.5～5Nm
3/ mint steel, when phosphorus content in the molten steel reaches 0.0030% when following, deep dephosphorization finishes;
The deep dephosphorization agent of described a kind of electric arc furnace deep dephosphorization technology, form according to weight percent by lime, brown iron oxide:
Lime 25%～40%
Ferric oxide 60%～75%
Effective constituent CaO in the described lime 〉=93%, active in 300ml, the effective constituent Fe in the ferric oxide
2O
3〉=98%;
Its preparation method is: after being crushed to 100～150 orders, mixing, fritting under 1200 ℃～1550 ℃ high temperature after its cooling, is processed into 3～50mm particle with above-mentioned raw materials;
Composition requirement after the fritting, CaO 30%～45%, Fe
2O
3+ FeO 55%～70%, and all the other are inevitable impurity.
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| CN102296152A (en) * | 2011-08-22 | 2011-12-28 | 辽宁天和科技股份有限公司 | Novel converter steelmaking dephosphorization agent and preparation method thereof |
| CN102277465A (en) * | 2011-08-22 | 2011-12-14 | 辽宁天和科技股份有限公司 | Novel metallurgical auxiliary material fluxing agent and preparation method thereof |
| CN102787212A (en) * | 2012-06-28 | 2012-11-21 | 辽宁中汇环保科技有限公司 | Steel-making dephosphorization agent and preparation method thereof |
| CN102965467B (en) * | 2012-10-31 | 2013-12-11 | 德龙钢铁有限公司 | Low-cost efficient dephosphorization smelting process for electric arc furnace |
| CN103320575A (en) * | 2013-03-19 | 2013-09-25 | 江苏省镔鑫特钢材料有限公司 | Molten-steel desulphurization dephosphorization treatment agent and preparation method |
| CN105219918A (en) * | 2015-09-29 | 2016-01-06 | 共享铸钢有限公司 | Reduce the arc furnace steelmaking process of phosphorus element content in molten steel |
| CN106893801B (en) * | 2015-12-18 | 2018-11-06 | 中国科学院金属研究所 | A kind of electric arc furnaces molten steel extra furnace dephosphorization method |
| CN107267703A (en) * | 2017-04-24 | 2017-10-20 | 鞍钢股份有限公司 | Molten iron dephosphorization device and dephosphorization method for rotary powder injection |
| CN113621756B (en) * | 2020-05-09 | 2022-11-15 | 莱芜钢铁集团银山型钢有限公司 | Control method for improving converter steelmaking early-stage dephosphorization effect |
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| CN1873031A (en) * | 2006-04-28 | 2006-12-06 | 吴秋华 | Dephosphorization agent for converter, and preparation method |
| CN101619377A (en) * | 2009-07-28 | 2010-01-06 | 武汉钢铁(集团)公司 | Deslagging and dephosphorizing method of electric stove |
| CN101775465A (en) * | 2009-12-31 | 2010-07-14 | 辽宁天和矿产有限公司 | Dephosphorization agent for converter steelmaking and preparation method thereof |
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| JPS5873714A (en) * | 1981-10-27 | 1983-05-04 | Daido Steel Co Ltd | Dephosphorizing method of molten steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1873031A (en) * | 2006-04-28 | 2006-12-06 | 吴秋华 | Dephosphorization agent for converter, and preparation method |
| CN101619377A (en) * | 2009-07-28 | 2010-01-06 | 武汉钢铁(集团)公司 | Deslagging and dephosphorizing method of electric stove |
| CN101775465A (en) * | 2009-12-31 | 2010-07-14 | 辽宁天和矿产有限公司 | Dephosphorization agent for converter steelmaking and preparation method thereof |
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| JP昭58-73714A 1983.05.04 |
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