CN101665867A - Method for increasing grade of sinter - Google Patents
Method for increasing grade of sinter Download PDFInfo
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- CN101665867A CN101665867A CN200910308387A CN200910308387A CN101665867A CN 101665867 A CN101665867 A CN 101665867A CN 200910308387 A CN200910308387 A CN 200910308387A CN 200910308387 A CN200910308387 A CN 200910308387A CN 101665867 A CN101665867 A CN 101665867A
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Abstract
The invention discloses a method for increasing grade of sinter, belonging to the metallurgy industry field. The method is used in the production technology of the sinter as follows: in a primary mixing step, roasted flux is used for replacing the existing raw flux in raw materials which comprises the following components according to weight percentage: 70-85% of iron-bearing raw material, 4-6% ofcalcined lime with 75-81% of CaO, 2.5-4.5% of calcium carbide with 65-70% of CaO, 6-8% of slaked lime with 52-54% of CaO, 1-1.5% of light burning magnesium oxide powder with 80-95% of MgO and 3-5% ofSiO2, 5-7% of pulverized coal or coke powder and 30-32% of return fines. The method can effectively increase the grade of sinter and reduce the production cost.
Description
Technical field
The invention belongs to the metallurgy industry field.
Background technology
Along with the fast development of steel industry, can be fewer and feweri for the high grade iron ore that sintering uses, more and more low-grade, high Al
2O
3Iron ore be applied to SINTERING PRODUCTION and become and must take advantage of a favourable situation.And the basicity of blast-furnace slag is by the decision of the basicity of agglomerate, and high MgO content can improve the flowability of blast-furnace slag.If sinter basicity, MgO content keep higher, this can cause the reduction of grade of sinter, relevant studies show that: the every decline 1% of grade of sinter, can cause that furnace processor reduces 3%, coke ratio increases by 1.5%, the ordinary production that this need keep blast furnace with addition of more high-grade pellet certainly will increase the cost of the pig iron per ton like this.
At present domestic and international most of sintering plants use and contain the lower rhombspar of magnesium or serpentine or part light-magnesite powder, the also use light dolomite that has, and raw material such as calcareous Wingdale are as flux.Unslaked lime or slaked lime enhancing mixed are granulated, and this is used for SINTERING PRODUCTION for original more high grade iron ore resources is the sophisticated selection of a kind of less expensive.But for now and in the future with the ore deposit structure, incompatibility.Because the reduction of iron ore grade is inevitable, if also prolonged with former production model, can only increase the low proportioning that contains magnesium, contains calcium flux, could guarantee that the basicity of agglomerate and MgO content reach the requirement that blast furnace is produced, the reduction of grade of sinter is inevitable so.
In general, producing agglomerate needs iron-bearing material, flux (rhombspar, Wingdale, unslaked lime), fuel raw materials such as (hard coal, coke powders) to prepare burden by certain proportion, forms by operations such as a secondary mixing granulation, cloth, igniting, sintering, cooling, the screenings of whole grain.In theory in the agglomerating process, substitute living flux rhombspar, Wingdale and unslaked lime with ripe flux unslaked lime, Calcium Carbide Ash, slaked lime and light calcined magnesia, can effectively reduce the flux proportioning, improve the iron material proportioning, deal with sintering and use iron ore of low ore grade, guarantee the requirement of blast furnace, effectively improve the grade of agglomerate sinter quality.Because light-magnesite powder MgO content about 80～88%, is 2.38～2.5 times of MgO content 32～37% of rhombspar.The CaO content of Wingdale is about 50～52%, and slaked lime, unslaked lime and 52～80% effects of Calcium Carbide Ash CaO content, all greater than the CaO content of Wingdale.
In existing various documents, also do not put down in writing calcic and contain the report that the ripe flux of magnesium substitutes living flux now.
Summary of the invention
The objective of the invention is to address the above problem and a kind of method that improves grade of sinter, this method are provided is to substitute existing living flux with ripe flux in the raw material in the process of producing agglomerate, can effectively improve the grade of agglomerate like this.
The technical solution adopted in the present invention is:
A kind of method that improves grade of sinter, may further comprise the steps: mixed once, raw material is transported in drum mixer, add an amount of moistening material of moisture content, secondary mixing, cloth, igniting, sintering, cooling and whole grain screening, in the described mixed once step, raw material is grouped into by the one-tenth of following weight per-cent: iron-bearing material 70～85%, CaO content are that 75～81% unslaked lime 4～6%, CaO content are that 65～70% Calcium Carbide Ash 2.5～4.5%, CaO content are that 52～54% the lime stone 6～8% that disappears, MgO content are 80～95%, SiO
2Content is 3～5% light-magnesite powder 1～1.5%, coal dust or coke powder 5～7% and returns mine 30～32%.
Preferably, described raw material is grouped into by the one-tenth of following weight per-cent: iron-bearing material 84～85%, CaO content are that 75～81% unslaked lime 4～6%, CaO content are that 65～70% Calcium Carbide Ash 2.5～4.5%, CaO content are that 52～54% the lime stone 2.7～4.5% that disappears, MgO content are 80～95%, SiO
2Content is 3～5% light-magnesite powder 1～1.5%, coal dust or coke powder 5～6% and returns mine 30～32%.
Preferably, described iron-bearing material is that iron ore concentrate, fine iron ore, mixing ore deposit, assorted ore deposit and their arbitrary proportion mix; Described iron-bearing material granularity is at 0～10mm, in 8～10mm scope less than 15%, water ratio is less than 15%.
Preferably, described unslaked lime burn out rate is 18～21%, granularity in 0～3mm scope greater than 90%.
Preferably, described Calcium Carbide Ash water ratio is less than 30%, granularity in 0～3mm scope greater than 80%.
Preferably, described slaked lime water ratio is 27～29%, granularity in 0～3mm scope greater than 90%.
Preferably, described light-magnesite powder burn out rate is 2～3%, granularity in 0～3mm scope greater than 90%.
Preferably, described coal dust or coke fines size in 0～3mm scope greater than 75%, water ratio is less than 15%.
Preferably, described returning mine is the agglomerate of granularity for-5mm.
The present invention has the following advantages:
1) all use ripe flux in the process of producing agglomerate, wherein calcareous flux has slaked lime, unslaked lime, and Calcium Carbide Ash, and the calcium content of these several flux is respectively 1 times, 1.5 times, 1.3 times of Wingdale; And light-magnesite powder also is the grog after a kind of calcination as containing magnesium flux, and MgO content wherein approximately is 5 times of rhombspar.Can effectively reduce the flux proportioning like this, improve the proportioning of iron material, highly beneficial to the raising of grade of sinter, if keep grade of sinter constant, can increase the consumption of low-grade iron material, adapt at present or the trend of ore resource in the future.
2) Calcium Carbide Ash is the waste material that stays behind the plant produced acetylene gas in the used ripe flux of the present invention, and is cheap, can effectively reduce production cost.
3) the present invention can effectively improve the granulating efficiency of compound, make+grade of 3.15mm increases, and improves the original ventilation property of sinter bed.
4) the present invention can reduce the ton ore deposit fuel consumption of agglomerate, and the use of whole ripe flux has avoided sintering process to give birth to the branch heat of desorption of flux.
5) the present invention just replaces living flux with whole ripe flux, does not need existing SINTERING PRODUCTION equipment is transformed, and has bigger use value and promotional value, can create huge economic benefit for enterprise.
Description of drawings
Fig. 1 is for producing the process flow sheet of agglomerate.
Embodiment
With reference to Fig. 1, the technology of producing agglomerate may further comprise the steps: mixed once, secondary mixing, cloth, igniting, sintering, cooling and seven steps of whole grain screening.According to the content of sintering basicity basicity CaO/SiO2=1.75～1.85, TEe be 57～59%, the content of MgO is 2.0～2.6% index, count by weight percentage: iron-bearing material 70～85%, CaO content are that 75～81% unslaked lime 4～6%, CaO content are that 65～70% Calcium Carbide Ash 2.5～4.5%, CaO content are that 52～54% the lime stone 6～8% that disappears, MgO content are 80～95%, SiO
2Content is 3.0～5.0% light-magnesite powder 1～1.5%, coal dust or coke powder 5～7% and returns mine 30～32%, adopts conventional proportioning method of calculation, calculates the component that meets the various proportioning raw materials that meet the demands and prepares raw material.Wherein light-magnesite powder replaces existing rhombspar, and slaked lime, Calcium Carbide Ash, unslaked lime replace existing Wingdale.
Iron-bearing material is that iron ore concentrate, fine iron ore, mixing ore deposit, assorted ore deposit and their arbitrary proportion mix; The iron-bearing material granularity is at 0～10mm, in 8～10mm scope less than 15%, water ratio is less than 15%.The unslaked lime burn out rate is 18～21%, granularity in 0～3mm scope greater than 90%.The Calcium Carbide Ash water ratio is less than 30%, granularity in 0～3mm scope greater than 80%.The slaked lime water ratio is 27～29%, granularity in 0～3mm scope greater than 90%.The light-magnesite powder burn out rate is 2～3%, granularity in 0～3mm scope greater than 90%.Coal dust or coke fines size in 0～3mm scope greater than 75%, water ratio is less than 15%, returns mine to be the agglomerate of granularity for-5mm.
After raw material is ready to, begins to carry out agglomerate and become to produce:
1) mixed once: selected material component is transported in drum mixer, adds an amount of moistening material of moisture content, the physics water content of raw material must be controlled between 8～10.5%, mixing time 3min makes various raw material thorough mixing even.
2) secondary mixes: the raw material that mixes is transported in the secondary drum mixer granulates, mixing time is greater than 3.5min, and the content that makes the feed particles of particle diameter more than 3mm is greater than 55%.
3) cloth: the feed particles after will granulating is spread in uniform on the belt down draft sintering machine trolley through distributor, and making sintered layer thickness is 600～800mm.
4) igniting: adopt coal gas ignition, the ignition temperature of control sinter machine be 950～1250 ℃, ignition time 1～3min, igniting negative pressure be 4000～6000Pa.
5) sintering: after ignition of sintering process finished, coal dust or coke powder in the raw material took fire, and control sintering negative pressure is 10000～12000Pa.
6) cooling: adopt cooling or the outer cooling mode of machine on any machine, the temperature of agglomerate is reduced to below 150 ℃.
7) screening: adopting several sieve apertures is that the vibratory screening apparatus of the 5～40mm particle after to cooling process sieves, and-5mm is a sinter return fine, and+5mm then is the finished product agglomerate.
Embodiment 1
The content of sintering basicity CaO/SiO2=1.85, TFe is 57%, the content of MgO is 2.5% index, and the weight percent of various compositions sees Table the S-1 in 1 in the raw material, and the chemical ingredients per-cent that contains in the various compositions of raw material sees Table 2.
In the raw material, the iron-bearing material granularity is at 0～10mm, and in 8～10mm scope is 14%, and water ratio is 12%.The unslaked lime burn out rate is 18%, and granularity is 92% in 0～3mm scope.The Calcium Carbide Ash water ratio is 25%, and granularity is 86% in 0～3mm scope.Slaked lime water ratio 27%, granularity are 92% in 0～3mm scope.The light-magnesite powder burn out rate is 2.44%, and granularity is 91% in 0～3mm scope.Coal powder size is 80% in 0～3mm scope, and water ratio is 12%.
After raw material is ready to, begin to carry out agglomerate production:
1) mixed once: selected material component is transported in drum mixer, adds an amount of moistening material of moisture content, make the physics water content of raw material be controlled at 8%, mixing time 3min makes various raw material thorough mixing even.
2) secondary mixes: the raw material that mixes is transported in the secondary drum mixer granulates, and mixing time 4min, the content that makes the feed particles of particle diameter more than 3mm is 60%.
3) cloth: the feed particles after will granulating is spread in uniform on the belt down draft sintering machine trolley through distributor, and making sintered layer thickness is 800mm.
4) igniting: adopt coal gas ignition, the ignition temperature of control sinter machine is 950, ignition time 2min, igniting negative pressure be 6000Pa.
5) sintering: after ignition of sintering process finished, coal dust or coke powder in the raw material took fire, and control sintering negative pressure is 11000.
6) cooling: adopt cooling or the outer cooling mode of machine on any machine, make the temperature of agglomerate be reduced to 140 ℃.
7) screening: adopting several sieve apertures is that the vibratory screening apparatus of the 5～40mm particle after to cooling process sieves, and-5mm is a sinter return fine, and+5mm then is the finished product agglomerate.
The every technical indicator of the agglomerate that production obtains sees Table the S-1 in 3, and the chemical ingredients per-cent of the agglomerate that the one-tenth product obtains sees Table the S-1 in 4.
Embodiment 2
The content of sintering basicity CaO/SiO2=1.80, TFe is 57%, the content of MgO is 2.6% index, and the weight percent of various compositions sees Table the S-2 in 1 in the raw material, and the chemical ingredients per-cent that contains in the various compositions of raw material sees Table 2.
In the raw material, the iron-bearing material granularity is at 0～10mm, and in 8～10mm scope is 10%, and water ratio is less than 13%.The unslaked lime burn out rate is 21%, and granularity is 95% in 0～3mm scope.The Calcium Carbide Ash water ratio is 26%, and granularity is 88% in 0～3mm scope.Slaked lime water ratio 29%, granularity are 95% in 0～3mm scope.The light-magnesite powder burn out rate is 3%, and granularity is 94% in 0～3mm scope.Coal powder size is 77% in 0～3mm scope, and water ratio is 14%.
After raw material is ready to, begin to carry out agglomerate production:
1) mixed once: selected material component is transported in drum mixer, adds an amount of moistening material of moisture content, make the physics water content of raw material be controlled at 10.5%, mixing time 3min makes various raw material thorough mixing even.
2) secondary mixes: the raw material that mixes is transported in the secondary drum mixer granulates, mixing time is 4min, and the content that makes the feed particles of particle diameter more than 3mm is 55%.
3) cloth: the feed particles after will granulating is spread in uniform on the belt down draft sintering machine trolley through distributor, and making sintered layer thickness is 700mm.
4) igniting: adopt coal gas ignition, the ignition temperature of control sinter machine be 1250 ℃, ignition time 1min, igniting negative pressure be 4000Pa.
5) sintering: after ignition of sintering process finished, coal dust or coke powder in the raw material took fire, and control sintering negative pressure is 12000Pa.
6) cooling: adopt cooling or the outer cooling mode of machine on any machine, make the temperature of agglomerate be reduced to 130 ℃.
7) screening: adopting several sieve apertures is that the vibratory screening apparatus of the 5～40mm particle after to cooling process sieves, and-5mm is a sinter return fine, and+5mm then is the finished product agglomerate.
The every technical indicator of the agglomerate that production obtains sees Table the S-2 in 3, and the chemical ingredients per-cent of the agglomerate that the one-tenth product obtains sees Table the S-2 in 4.
Embodiment 3
The content of sintering basicity CaO/SiO2=1.85, TFe is 58%, the content of MgO is 2.0% index, and the weight percent of various compositions sees Table the S-3 in 1 in the raw material, and the chemical ingredients per-cent that contains in the various compositions of raw material sees Table 2.
In the raw material, the iron-bearing material granularity is at 0～10mm, and in 8～10mm scope is 10%, and water ratio is 12%.The unslaked lime burn out rate is 20%, and granularity is 95% in 0～3mm scope.The Calcium Carbide Ash water ratio is 28%, and granularity is 82% in 0～3mm scope.Slaked lime water ratio 28%, granularity are 96% in 0～3mm scope.The light-magnesite powder burn out rate is 2%, and granularity is 95% in 0～3mm scope.Coal powder size is 77% in 0～3mm scope, and water ratio is 10%.
After raw material is ready to, begins to carry out agglomerate and become to produce:
1) mixed once: selected material component is transported in drum mixer, adds an amount of moistening material of moisture content, make the physics water content of raw material be controlled at 9%, mixing time 3min makes various raw material thorough mixing even.
2) secondary mixes: the raw material that mixes is transported in the secondary drum mixer granulates, mixing time is 3.6min, and the content that makes the feed particles of particle diameter more than 3mm is 60%.
3) cloth: the feed particles after will granulating is spread in uniform on the belt down draft sintering machine trolley through distributor, and making sintered layer thickness is 800mm.
4) igniting: adopt coal gas ignition, the ignition temperature of control sinter machine be 1100 ℃, ignition time 3min, igniting negative pressure be 6000Pa.
5) sintering: after ignition of sintering process finished, coal dust or coke powder in the raw material took fire, and control sintering negative pressure is 10000～12000Pa.
6) cooling: adopt cooling or the outer cooling mode of machine on any machine, make the temperature of agglomerate be reduced to 120 ℃.
7) screening: adopting several sieve apertures is that the vibratory screening apparatus of the 5～40mm particle after to cooling process sieves, and-5mm is a sinter return fine, and+5mm then is the finished product agglomerate.
The every technical indicator of the agglomerate that production obtains sees Table the S-3 in 3, and the chemical ingredients per-cent of the agglomerate that the one-tenth product obtains sees Table the S-3 in 4.
Embodiment 4
The content of sintering basicity CaO/SiO2=1.75, TFe is 57%, the content of MgO is 2.6% index, and the weight percent of various compositions sees Table the S-4 in 1 in the raw material, and the chemical ingredients per-cent that contains in the various compositions of raw material sees Table 2.
In the raw material, the iron-bearing material granularity is at 0～10mm, and in 8～10mm scope is 13%, and water ratio is 14%.The unslaked lime burn out rate is 17%, and granularity is 95% in 0～3mm scope.The Calcium Carbide Ash water ratio is 26%, and granularity is 87% in 0～3mm scope.Slaked lime water ratio 29%, granularity are 95% in 0～3mm scope.The light-magnesite powder burn out rate is 2%, and granularity is 93% in 0～3mm scope.Coal powder size is 77% in 0～3mm scope, and water ratio is 13%.
After raw material is ready to, begin to carry out agglomerate production:
1) mixed once: selected material component is transported in drum mixer, adds an amount of moistening material of moisture content, make the physics water content of raw material be controlled at 8%, mixing time 3min makes various raw material thorough mixing even.
2) secondary mixes: the raw material that mixes is transported in the secondary drum mixer granulates, and mixing time 4min, the content that makes the feed particles of particle diameter more than 3mm is 60%.
3) cloth: the feed particles after will granulating is spread in uniform on the belt down draft sintering machine trolley through distributor, and making sintered layer thickness is 70000mm.
4) igniting: adopt coal gas ignition, the ignition temperature of control sinter machine be 950 ℃, ignition time 3min, igniting negative pressure be 4000Pa.
5) sintering: after ignition of sintering process finished, coal dust or coke powder in the raw material took fire, and control sintering negative pressure is 12000Pa.
6) cooling: adopt cooling or the outer cooling mode of machine on any machine, make the temperature of agglomerate be reduced to 130 ℃.
7) screening: adopting several sieve apertures is that the vibratory screening apparatus of the 5～40mm particle after to cooling process sieves, and-5mm is a sinter return fine, and+5mm then is the finished product agglomerate.
The every technical indicator of the agglomerate that production obtains sees Table the S-4 in 3, and the chemical ingredients per-cent of the agglomerate that the one-tenth product obtains sees Table the S-4 in 4.
In order to show the advantage of utilizing the present invention to obtain every technical indicator of agglomerate, provided comparative run S-0, the weight percent of various compositions sees Table the S-0 in 1 in the comparative run raw material, the chemical ingredients per-cent that contains in the various compositions of comparative run raw material sees Table 2, the every technical indicator of agglomerate that becomes product to obtain sees Table the S-0 in 3, and the chemical ingredients of the agglomerate that the one-tenth product obtains sees Table the S-0 in 4.
The weight percent of various compositions in table 1 embodiment 1 to embodiment 4 and the comparative run raw material
| Test number | Iron-bearing material iron ore A | Iron-bearing material iron ore B | The iron-bearing material iron ore | Iron-bearing material iron ore D | Slaked lime | Wingdale | Rhombspar | Unslaked lime | Calcium Carbide Ash | Light-magnesite powder | Coal part or coke powder | Return mine (joining outward) |
| ??S-0 | ??50.02 | ??15.0 | ??3.5 | ??9.0 | ??5.86 | ??4.73 | ??5.89 | ??-- | ??-- | ??-- | ??5.0 | ??32.0 |
| ??S-1 | ??53.8 | ??16.0 | ??3.5 | ??9.0 | ??7.5 | ??-- | ??-- | ??3.0 | ??2.5 | ??1.0 | ??6.0 | ??32.0 |
| ??S-2 | ??54.0 | ??16.5 | ??4.5 | ??10.0 | ??8.0 | ??-- | ??-- | ??4.0 | ??4.5 | ??1.2 | ??6.0 | ??30.0 |
| ??S-3 | ??50.3 | ??11.5 | ??3.5 | ??9.0 | ??6.0 | ??-- | ??-- | ??6.0 | ??2.7 | ??1.2 | ??5.5 | ??30.0 |
| ??S-4 | ??54.0 | ??16.5 | ??3.8 | ??10.0 | ??7.0 | ??-- | ??-- | ??4.25 | ??4.25 | ??1.5 | ??6.0 | ??31.0 |
The chemical ingredients per-cent that contains in the various compositions of table 2 embodiment 1 to embodiment 4 and comparative run raw material
| ??TFe | ??FeO | ??CaO | ??SiO | ??MgO | Scaling loss | Moisture | |
| Iron-bearing material iron ore A | ??63.63 | ??4.80 | ??-- | ??4.32 | ??-- | ??3.59 | ??6.2 |
| Iron-bearing material iron ore B | ??63.51 | ??17.90 | ??0.74 | ??7.47 | ??-- | ??0.95 | ??14.35 |
| The iron-bearing material iron ore | ??62.64 | ??2.40 | ??1.92 | ??6.02 | ??-- | ??0.71 | ??6.45 |
| Iron-bearing material iron ore D | ??61.71 | ??14.90 | ??3.84 | ??4.31 | ??-- | ??2.57 | ??6.7 |
| Wingdale | ??-- | ??-- | ??50.43 | ??2.67 | ??2.07 | ??41.76 | ??2.1 |
| Rhombspar | ??-- | ??-- | ??34.59 | ??1.31 | ??16.82 | ??43.58 | ??2.0 |
| Slaked lime | ??-- | ??-- | ??52.87 | ??3.30 | ??3.31 | ??27.92 | ??28.5 |
| Unslaked lime | ??-- | ??-- | ??79.07 | ??2.52 | ??2.07 | ??20.67 | ??-- |
| Calcium Carbide Ash | ??-- | ??-- | ??68.12 | ??-- | ??-- | ??-- | ??23.14 |
| Light-magnesite powder | ??-- | ??-- | ??0.80 | ??4.60 | ??86.35 | ??2.44 | ??-- |
| Coal ash or coke powder | ??-- | ??-- | ??0.2 | ??4.3 | ??-- | ??-- | ??-- |
Table 3 embodiment 1 to embodiment 4 and comparative run production obtain every technical indicator of agglomerate
| ??+3.15 ??mm％ | Moisture content % | Finished product % | Sintering velocity mm/min | Utilization coefficient t/m 2.h | Coal consumption kg/t | Barrate strength % | Equilibrium system (doubly) | |
| ??S-0 | ??53.21 | ??7.8 | ??72.31 | ??25.98 | ??1.564 | ??74.56 | ??64.53 | ??1.02 |
| ??S-1 | ??57.52 | ??9.85 | ??74.07 | ??22.30 | ??1.370 | ??75.17 | ??62.67 | ??0.91 |
| ??S-2 | ??68.46 | ??10.25 | ??70.59 | ??23.53 | ??1.501 | ??71.41 | ??62.67 | ??1.10 |
| ??S-3 | ??71.76 | ??9.90 | ??76.01 | ??25.42 | ??1.612 | ??72.29 | ??64.53 | ??0.91 |
| ??S-4 | ??70.28 | ??10.0 | ??73.43 | ??25.08 | ??1.603 | ??72.39 | ??62.93 | ??0.90 |
Table 4 embodiment 1 to embodiment 4 and comparative run become to produce the chemical ingredients per-cent of the agglomerate that obtains
| ??TFe | ??FeO | ??CaO | ??SiO 2 | ??Ro | ??MgO | |
| ??S-0 | ??57.52 | ??7.80 | ??9.00 | ??4.90 | ??1.84 | ??2.39 |
| ??S-1 | ??58.74 | ??9.50 | ??8.76 | ??4.75 | ??1.84 | ??2.36 |
| ??S-2 | ??58.32 | ??10.50 | ??8.77 | ??4.88 | ??1.80 | ??2.39 |
| ??S-3 | ??58.75 | ??10.00 | ??8.80 | ??4.78 | ??1.84 | ??2.37 |
| ??S-4 | ??58.75 | ??10.60 | ??8.83 | ??4.82 | ??1.83 | ??2.49 |
The composite test scheme of several ripe flux shows that the flux proportioning is reduced to 8.5～10% respectively from 16.48%, and the iron charge proportioning will rise 6.48～7.98%, and grade of sinter has increased by 0.8～1.0%.And partly replace slaked lime to carry out exploratory experiment with unslaked lime, control compound moisture content is 10 ± 0.05%, when being 2.5: 1 adapteds in proportion with slaked lime of drying and unslaked lime, test-results shows that granulating efficiency is also relatively poor, in the compound+and the 3.15mm grade only accounts for 57.52%, and bed permeability is poor, and sintering velocity is slow, have only 22.30mm/min, the output of agglomerate has only 1.370t/m
2H because sintering velocity is slower, so the agglomerate cold strength is 62.67%, reduces few.
Because Calcium Carbide Ash water ratio about 23%, the mixing degree is also low, and when carbide slag drying all replaced slaked lime, granulating efficiency was better, in the compound+3.15mm reaches more than 68.46%, and the original ventilation property of the bed of material is better.But the character of Calcium Carbide Ash and slaked lime, unslaked lime are different, and along with temperature rises, moisture constantly evaporates, Calcium Carbide Ash particle adsorptivity is relatively poor, has influenced the ventilation property of sinter bed, so sintering velocity is not high, have only 23.53mm/min, and yield rate is lower, the agglomerate cold strength is 62.67%.
With Calcium Carbide Ash with after unslaked lime mixed by 1: 1, quicklime slaking the moisture content of Calcium Carbide Ash, this moment, the moisture content of combination ash only contained 4～5%, outward appearance and unslaked lime are near also all scattering.When testing with combination ash, in the compound+3.15mm reaches 70.28%, and sintering velocity is very fast, and yield rate also brings up to 73.43%, and utilization coefficient is compared the 0.102t/m that risen with full distribution lime
2H, the output increase rate is 6.80%, sintered ore rotary drum strength makes moderate progress; When using unslaked lime and Calcium Carbide Ash ratio is when mixing at 6.3: 3.7, and near 6: 4 o'clock, granulating efficiency was better, in the compound+and 3.15mm accounts for 71.76%.Because of its with Calcium Carbide Ash mixing process in unslaked lime digest in advance, so yet complete digestion when mixing granulation finishes can not influence permeability of sintering material bed, so vertical sintering speed further improves, yield rate reaches 76.01%, and agglomerate output improves again about 1%, and barrate strength reaches 64.53%.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (9)
1. method that improves grade of sinter, may further comprise the steps: mixed once, raw material is transported in drum mixer, add an amount of moistening material of moisture content, secondary mixes, cloth, igniting, sintering, cooling and whole grain screening, it is characterized in that, in the described mixed once step, raw material is grouped into by the one-tenth of following weight per-cent: iron-bearing material 70～85%, CaO content is 75～81% unslaked lime 4～6%, CaO content is 65～70% Calcium Carbide Ash 2.5～4.5%, CaO content is 52～54% the lime stone 6～8% that disappears, MgO content is 80～95%, and SiO2 content is 3～5% light-magnesite powder 1～1.5%, coal dust or coke powder 5～7% and return mine 30～32%.
2. the method for raising grade of sinter according to claim 1, it is characterized in that, described raw material is grouped into by the one-tenth of following weight per-cent: iron-bearing material 84～85%, CaO content are that 75～81% unslaked lime 4～6%, CaO content are that 65～70% Calcium Carbide Ash 2.5～4.5%, CaO content are that 52～54% the lime stone 2.7～4.5% that disappears, CaO content are 80～95%, and SiO2 content is 3～5% light-magnesite powder 1～1.5%, coal dust or coke powder 5～6% and returns mine 30～32%.
3. according to the method for claim 1 or 2 any described raising grade of sinter, it is characterized in that described iron-bearing material is that iron ore concentrate, fine iron ore, mixing ore deposit, assorted ore deposit and their arbitrary proportion mix; Described iron-bearing material granularity is at 0～10mm, in 8～10mm scope less than 15%, water ratio is less than 15%.
4. according to the method for claim 1 or 2 any described raising grade of sinter, it is characterized in that described unslaked lime burn out rate is 18～21%, granularity in 0～3mm scope greater than 90%.
5. according to the method for claim 1 or 2 any described raising grade of sinter, it is characterized in that described Calcium Carbide Ash water ratio is less than 30%, granularity in 0～3mm scope greater than 80%.
6. according to claim 1 or 2 or the method for any described raising grade of sinter, it is characterized in that described slaked lime water ratio is 27～29%, granularity in 0～3mm scope greater than 90%.
7. according to the method for claim 1 or 2 any described raising grade of sinter, it is characterized in that described light-magnesite powder burn out rate is 2～3%, granularity in 0～3mm scope greater than 90%.
8. according to the method for claim 1 or 2 any described raising grade of sinter, it is characterized in that, described coal dust or coke fines size in 0～3mm scope greater than 75%, water ratio is less than 15%.
9. according to the method for claim 1 or 2 any described raising grade of sinter, it is characterized in that described returning mine is the agglomerate of granularity for-5mm.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103572043A (en) * | 2012-07-25 | 2014-02-12 | 上海梅山钢铁股份有限公司 | Production method of agglomerate with low alkalinity |
| CN103757202A (en) * | 2014-01-30 | 2014-04-30 | 首钢总公司 | Sintering method for sintering part of return ores without granulation |
| CN105714103A (en) * | 2014-12-01 | 2016-06-29 | 鞍钢股份有限公司 | Method for producing sinter by using iron ore concentrate as main iron material |
| CN106521145A (en) * | 2016-11-08 | 2017-03-22 | 首钢总公司 | Method and device for improving burning efficiency of sintering fuel |
| CN106521144A (en) * | 2016-11-08 | 2017-03-22 | 首钢总公司 | Method and system for reducing content of CO and nitric oxide in sintering waste gas |
| CN108070713A (en) * | 2016-11-10 | 2018-05-25 | 宝山钢铁股份有限公司 | A kind of iron ore sintering method using calcined magnesite ball |
| CN111235383A (en) * | 2019-12-30 | 2020-06-05 | 武钢资源集团有限公司 | Method for producing sintered ore by adding and using low magnesium resource |
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2009
- 2009-10-16 CN CN200910308387A patent/CN101665867A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103572043A (en) * | 2012-07-25 | 2014-02-12 | 上海梅山钢铁股份有限公司 | Production method of agglomerate with low alkalinity |
| CN103572043B (en) * | 2012-07-25 | 2016-12-07 | 上海梅山钢铁股份有限公司 | The production method of low basicity sinter |
| CN103757202A (en) * | 2014-01-30 | 2014-04-30 | 首钢总公司 | Sintering method for sintering part of return ores without granulation |
| CN103757202B (en) * | 2014-01-30 | 2016-06-29 | 首钢总公司 | Sintering method for sintering part of return ores without granulation |
| CN105714103A (en) * | 2014-12-01 | 2016-06-29 | 鞍钢股份有限公司 | Method for producing sinter by using iron ore concentrate as main iron material |
| CN106521145A (en) * | 2016-11-08 | 2017-03-22 | 首钢总公司 | Method and device for improving burning efficiency of sintering fuel |
| CN106521144A (en) * | 2016-11-08 | 2017-03-22 | 首钢总公司 | Method and system for reducing content of CO and nitric oxide in sintering waste gas |
| CN108070713A (en) * | 2016-11-10 | 2018-05-25 | 宝山钢铁股份有限公司 | A kind of iron ore sintering method using calcined magnesite ball |
| CN108070713B (en) * | 2016-11-10 | 2020-03-27 | 宝山钢铁股份有限公司 | Iron ore sintering method using light-burned magnesium balls |
| CN111235383A (en) * | 2019-12-30 | 2020-06-05 | 武钢资源集团有限公司 | Method for producing sintered ore by adding and using low magnesium resource |
| CN111235383B (en) * | 2019-12-30 | 2022-01-14 | 武钢资源集团乌龙泉矿业有限公司 | Method for producing sintered ore by adding and using low magnesium resource |
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