CN100465306C - Sintered ore capable of improving viscosity of blast furnace slag and process for preparing same - Google Patents
Sintered ore capable of improving viscosity of blast furnace slag and process for preparing same Download PDFInfo
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- CN100465306C CN100465306C CNB2006101251958A CN200610125195A CN100465306C CN 100465306 C CN100465306 C CN 100465306C CN B2006101251958 A CNB2006101251958 A CN B2006101251958A CN 200610125195 A CN200610125195 A CN 200610125195A CN 100465306 C CN100465306 C CN 100465306C
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Abstract
The invention discloses a sintered ore and preparing method of improved blast furnace slag viscosity to solve bad fluidity of blast furnace slag with high Al2O3 in the present ferric ore, which comprises the following parts: 70-85% ferric material, 2-5% limestone, 0.2-5% light-burned magnesia powder and 3-8% coal dust or coke dust, wherein the alkalinity of CaO and SiO2 of sintering ore is 1.5-3.0 with TFe at 50-60% and MgO at 1.5-4.0%. The preparing method comprises the following steps: allocating raw materials; blending once and twice; distributing materials; igniting; sintering; cooling; sieving.
Description
Technical field
The present invention relates in the metallurgy industry to refer to a kind of agglomerate that can improve blast-furnace slag viscosity and preparation method thereof particularly as the agglomerate of one of blast furnace ironmaking raw material.
Background technology
In the blast furnace ironmaking field, the viscosity of blast-furnace slag is the important indicator of blast-furnace smelting, is mainly reflected on the flowability of blast-furnace slag.The flowability of blast-furnace slag not only can influence the quality of the pig iron, can also influence blast furnace productivity, deslagging operation efficiency etc.The mobile quality of blast-furnace slag mainly is by contained Al in the slag
2O
3With the decision of the amount of MgO.Work as Al
2O
3During too high levels, slag viscosity increase, slag retrogradation, mobile variation; When the MgO too high levels, slag viscosity reduces, slag is thinning, flowability is good excessively; So when blast-furnace smelting, Al in the slag
2O
3Just become the indicator of slag fluidity quality with MgO content and ratio thereof.
Because the swift and violent expansion of domestic iron and steel production capacity makes the consumption of domestic iron ore increase sharply, and causes iron ore resource more and more nervous.And China's iron ore resource is not only poor, and grade is lower, so have to rely on a large amount of imported iron ore stone.In iron ore exporting country, Australia is big export country, but owing to Al in the Australian iron ore
2O
3Content is higher, for using the more iron and steel enterprise of Australian iron ore, will inevitably cause the increase of blast-furnace slag viscosity, mobile variation.For example Wuhan iron and steel stock company to use Australian iron ore be maximum at home, not only consumption is big, and the ratio of shared iron ore is also big.Before 2003, use Al in the blast-furnace slag that Australian iron ore produced
2O
3Content about 16%, then increases to about 18% mostly in recent years, even higher, and the viscosity of blast-furnace slag is increased, and causes the blast-furnace smelting difficulty, even directly threatens blast furnace production.
For blast-furnace smelting enterprise, the Al in the blast-furnace slag
2O
3Content generally all is to need strict control.But because resource problem, many enterprises have loosened the specification of quality of iron ore, cause Al in the blast-furnace slag
2O
3The content height has become a general problem.For this reason, improve blast-furnace slag viscosity or mobile one of the common key problem paid close attention to of smelting scientific research personnel that also becomes.After in a single day the iron ore resource of iron and steel enterprise is determined, Al wherein
2O
3Content can't reduce, so the MgO content that improves in the feed stock for blast furnace is to adjust MgO, Al in the blast-furnace slag
2O
3The effective ways of content and ratio thereof.
At present, in the blast-furnace smelting enterprise, the composition of feed stock for blast furnace is mostly based on agglomerate at home, and it occupies ratio about 70～80%, is equipped with a spot of pellet (enriched ore) and lump ore (rawore), and it occupies ratio separately about 10～15%.As seen, the content of MgO is the shortcut that improves MgO content in the feed stock for blast furnace in the raising main raw material agglomerate.The composition of agglomerate comprises iron ore raw material, flux (Wingdale, rhombspar, unslaked lime, slaked lime etc.) and fuel (hard coal, coke powder), wherein the proportioning of fuel is fixed basically, MgO mainly is included in the flux, therefore increase the proportioning of flux, must cause the iron ore proportioning raw materials to reduce, make the agglomerate iron-holder reduce.Usually, MgO content adopts in the raising agglomerate increases rhombspar, the light dolomite proportioning realizes, but because the content of MgO is limited in this class flux, after proportional quantity increases, the grade of agglomerate will descend, particularly when MgO content in the agglomerate surpasses certain limit, the output of agglomerate, quality and coal consumption index all can variation, the grade of agglomerate also can significantly reduce, therefore must select for use high-grade iron ore raw material to remedy the reduction of its grade, and this has caused the increase of raw materials for sintering cost.
Summary of the invention
Purpose of the present invention will solve high Al in the existing iron ore exactly
2O
3Enrichment and cause the problem of the mobile variation of blast-furnace slag provides that a kind of grade is higher, cost is lower, production technique is simpler and more direct and can improve agglomerate of blast-furnace slag viscosity and preparation method thereof effectively.
For achieving the above object, the present invention has developed a kind of agglomerate that improves blast-furnace slag viscosity, and each raw material of this agglomerate is by weight ratio: iron-bearing material 70～85%, unslaked lime 2～5%, rhombspar 0～8%, Wingdale 5～12%, light-magnesite powder 0.2～5%, coal dust or coke powder 3～8%; The basicity CaO/SiO2=1.5 of this agglomerate～3.0 simultaneously, the content of TFe is 50～60%, the content of MgO is 1.5～4.0%.
The preferable weight proportion of each raw material of above-mentioned agglomerate is: iron-bearing material 75～80%, unslaked lime 3～4%, rhombspar 0～5%, Wingdale 8～10%, light-magnesite powder 0.5～2.5%, coal dust or coke powder 5～7%; The basicity CaO/SiO2=1.5 of this agglomerate～3.0 simultaneously, the content of TFe is 53～57%, the content of MgO is 2.0～2.8%.
The raw material light-magnesite powder of above-mentioned agglomerate is a kind of grog, can obtain by commercially available channel.It is to be raw material with the high-quality giobertite, behind reflecting kiln, boiling roaster, and fine grinding and the product made again, its MgO content reaches as high as 99% generally more than 70～80%.Since its steady quality, the purity height, and activity degree is good, fine size, can be widely used in industries such as refractory materials, chemical industry, building materials, papermaking, herding.The preferred light-magnesite powder of the present invention, the content of MgO is: 80～95%, SiO
2Content be: 2.0～6.0%, all the other are unavoidable impurities, and its burn out rate is 1.5～4.5%, and its burn out rate is about 2.0% generally speaking.
The iron-bearing material of above-mentioned agglomerate comprises various iron ores, iron ore concentrate, fine iron ore, mixing ore deposit, Za Kuang (metallurgical assorted material) and their arbitrary combination.
The above-mentioned preparation method who improves the agglomerate of blast-furnace slag viscosity is achieved in that at first according to the requirement of blast furnace to sinter basicity CaO/SiO2 and MgO content, determined the Chemical Composition of agglomerate, and press iron-bearing material (powdered iron ore, iron ore concentrate, assorted ore deposit etc.), flux (unslaked lime, Wingdale, rhombspar or light dolomite, light-magnesite powder), the chemical content of fuel (coal dust or coke powder) calculates satisfactory proportioning, prepare raw material according to proportioning then, through mixing, moistening, after the granulation, cloth on sinter machine again, igniting, sintering is at last through overcooling, screening obtains the agglomerate finished product.Its detailed processing step is as follows:
1) raw material is equipped with: the content that satisfies basicity CaO/SiO2=1.5～3.0, TFe by the agglomerate finished product is 50～60%, the content of MgO is 1.5～4.0% requirement, and the material component of choosing a kind of concrete numerical value in weight proportion is the scope of iron-bearing material 70～85%, unslaked lime 2～5%, rhombspar 0～8%, Wingdale 5～12%, light-magnesite powder 0.2～5%, coal dust or coke powder 3～8% is standby;
2) 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 is controlled between 3～8%, and raw material is mixed;
3) secondary mixes: the raw material that mixes is transported in the secondary drum mixer granulates, the content that makes the feed particles of particle diameter more than 3mm is greater than 60%;
4) cloth: the feed particles after will granulating evenly dispenses on the sintering pallet, and the gauge control that makes sinter bed is in the scope of 350～800mm;
5) igniting: the ignition temperature of control sinter machine be 950～1250 ℃, ignition time 1～3min, igniting negative pressure be 4000～6000Pa;
6) sintering: after ignition of sintering process finished, coal dust or coke powder in the raw material took fire, and control sintering negative pressure is 6000～12000Pa;
7) cooling: adopt cooling or the outer cooling mode of machine on any machine, the temperature of agglomerate is reduced to below 150 ℃;
8) screening: adopting sieve aperture is that the vibratory screening apparatus of the 4.5～6mm particle after to cooling process sieves, and screen underflow is a sinter return fine, and screen overflow then is the finished product agglomerate.
The invention has the advantages that: adopted a spot of light-magnesite powder in the designed agglomerate as the staflux raw material, because light-magnesite powder is the grog after a kind of calcination, MgO content wherein approximately is 5 times of rhombspar, 2.5 times of light dolomite, so it can partly or entirely replace rhombspar or light dolomite.Like this:
One can effectively improve the MgO content in the agglomerate, increases the MgO content in the blast-furnace smelting feed stock for blast furnace, reduces the viscosity of blast-furnace slag, improves the flowability of blast-furnace slag, and then improves iron quality and production efficiency.
Its two flux proportioning that can reduce in the agglomerate, increase the iron ore proportion of raw materials, improve the grade of agglomerate, or keeping under the constant condition of grade of sinter, use a part of low-grade iron ore, particularly utilize domestic iron ore of low ore grade resource and smelt the cost that waste reduces agglomerate.
Its three burnup that can reduce agglomerate effectively improves the productivity of agglomerate, and when the MgO content in the agglomerate during above certain limit, guarantees that output, quality and the coal consumption index of agglomerate do not worsen.
Simultaneously, the preparation method of agglomerate of the present invention is simple, only adopts light-magnesite powder partly or entirely to replace rhombspar or light dolomite as flux, does not need existing SINTERING PRODUCTION equipment is transformed.Can not only tackle Al in the blast-furnace slag according to the agglomerate that this method is prepared
2O
3The difficult critical situation that the content height is brought is effectively improved the flowability of blast-furnace slag, but also has opened up the new variety of staflux raw material, has bigger use value and promotional value, can create huge economic benefit for enterprise.
Description of drawings
Accompanying drawing is the preparation method's of the agglomerate that improves a blast-furnace slag viscosity proposed by the invention process flow sheet.
Embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments:
As shown in the figure, preparation technology's flow process of agglomerate of the present invention roughly is divided into: raw material outfit → mixed once → secondary mixing → cloth → igniting → sintering → cooling → stages such as screening.Its concrete operations step is as follows:
1) raw material is equipped with: according to the specific requirement of blast furnace to sinter basicity CaO/SiO2 and MgO content, the content that satisfies basicity CaO/SiO2=1.5～3.0, TFe by the agglomerate finished product is 50～60%, the content of MgO is 1.5～4.0% index, in weight proportion is the scope of iron-bearing material 70～85%, unslaked lime 2～5%, rhombspar 0～8%, Wingdale 5～12%, light-magnesite powder 0.2～5%, coal dust or coke powder 3～8%, adopt conventional method of calculation, it is standby to calculate each material component that meets blast furnace requirement proportioning.Wherein: iron-bearing material can select various iron ores, iron ore concentrate, fine iron ore, mixing ore deposit, Za Kuang, return mine and their arbitrary combination; Light-magnesite powder selects that MgO content is 90%, SiO
2Content is 4.00%, burn out rate is about 2.0% finished product.In selected each raw material, light-magnesite powder, unslaked lime granularity in 0～3mm scope greater than 90%, Wingdale, rhombspar, coal dust or coke fines size in 0～3mm scope greater than 75%, water ratio is less than 15%; The granularity of iron-bearing material is less than 8mm, and water ratio is less than 20%.
2) 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 is controlled between 4～8%, mixing time 1.5～3.5min makes various raw material thorough mixing even.
3) 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 60%.
4) 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 350～800mm.
5) 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.
6) sintering: after ignition of sintering process finished, coal dust or coke powder in the raw material took fire, and control sintering negative pressure is 6000～12000Pa.
7) cooling: adopt cooling or the outer cooling mode of machine on any machine, the temperature of agglomerate is reduced to below 150 ℃.
8) screening: adopting sieve aperture is that the vibratory screening apparatus of the 4.5～6mm particle after to cooling process sieves, and screen underflow is a sinter return fine, and screen overflow then is the finished product agglomerate.
According to above-mentioned technical process, the present invention has finished the prepared in laboratory and the industrial preparation of many batches of agglomerate, and the agglomerate of industrial preparation has been applied in the industrial blast-furnace smelting.Wherein every specific targets of a part of agglomerate and their test-results in blast-furnace smelting referring under tabulate 1 to table 8:
Table 1, table 2 and table 3 have been listed the proportioning raw materials of each batch agglomerate, Chemical Composition and SINTERING TECHNOLOGY index in the laboratory respectively, be provided with altogether to be numbered and test 1 to the experimental example of testing 6 batches of agglomerate, wherein being numbered the agglomerate of testing 1 batch is the comparative experiments example that does not adopt light-magnesite powder.
Table 4, table 5 and table 6 have been listed the proportioning raw materials of each batch agglomerate in the commerical test respectively, Chemical Composition and SINTERING TECHNOLOGY index, be provided with the embodiment that is numbered 0 to 2 batch of agglomerate altogether, the agglomerate that wherein is numbered 0 batch is the comparing embodiment that does not adopt light-magnesite powder, the agglomerate that is numbered 1～2 batch is embodiments of the invention, is numbered that iron-bearing material is mixed by iron ore concentrate, mixing ore deposit, South Africa fine iron ore and Za Kuang in 0 to 2 batch the agglomerate.Table 7 has been listed the Chemical Composition of the blast-furnace slag of being produced when the agglomerate that is numbered 0 to 2 batch is used for blast-furnace smelting.Table 8 has been listed the viscosity of the blast-furnace slag of being produced when the agglomerate that is numbered 0 to 2 batch is used for blast-furnace smelting.
The above-mentioned agglomerate that is numbered 0 to 2 batch is at 360m
2Sinter machine and 3200m
3Carry out on the blast furnace, SINTERING PRODUCTION and blast-furnace smelting index have been examined or check in the process of the test, and get agglomerate and blast-furnace slag detects, test-results shows: after adopting light-magnesite powder to replace part and whole rhombspar as staflux, MgO content obviously improves in the agglomerate on the one hand, and the agglomerate yield rate improves 1.12%.The metallurgical performance of agglomerate is improved on the other hand, and wherein low temperature reduction degradation index RDI reduces by 4.86%, and middle temperature reduction degree RI also has raising.Blast-furnace slag viscosity has reduced by 23.78% in the time of 1380 ℃ simultaneously, has reduced by 22.45% in the time of 1430 ℃, has reduced by 22.6% in the time of 1480 ℃, has guaranteed that blast-furnace smelting is at Al
2O
3Furnace condition anterograde under the content conditions of higher, smelting index improves, for enterprise has created bigger economic benefit.
Table 1: the agglomerate proportioning raw materials (weight %) in the laboratory
Table 2: the agglomerate chemical ingredients (%) in the laboratory
| Numbering | TFe | SiO 2 | CaO | RO | MgO |
| Test 1 | 58.25 | 4.90 | 8.99 | 1.84 | 2.24 |
| Test 2 | 5833 | 4.91 | 8.99 | 1.84 | 2.28 |
| Test 3 | 58.33 | 497 | 8.99 | 1.84 | 230 |
| Test 4 | 58.91 | 5.01 | 9.26 | 1.85 | 2.33 |
| Test 5 | 59.25 | 5.09 | 9.49 | 1.86 | 2.97 |
| Test 6 | 59.50 | 516 | 9.62 | - 1.87 | 4.33 |
Table 3: the SINTERING TECHNOLOGY index in the laboratory
Table 4: the agglomerate proportioning raw materials (weight %) in the commerical test
Table 5: the agglomerate Chemical Composition (%) in the commerical test
Table 6: the SINTERING TECHNOLOGY index in the commerical test
Table 7: the blast-furnace slag Chemical Composition (%) in the commerical test
Table 8: the blast-furnace slag viscosity (Pa) in the commerical test
Claims (5)
1. agglomerate that improves blast-furnace slag viscosity, each raw material of this agglomerate is by weight ratio: iron-bearing material 70～85%, unslaked lime 2～5%, rhombspar 0～8%, Wingdale 5～12%, light-magnesite powder 0.2～5%, coal dust or coke powder 3～8%; Wherein light-magnesite powder, unslaked lime granularity in 0～3mm scope greater than 90%, Wingdale, rhombspar, coal dust or coke fines size in 0～3mm scope greater than 75%, the granularity of iron-bearing material is less than 8mm; The basicity CaO/SiO of this agglomerate simultaneously
2=1.5～3.0, the content of TFe is 50～60%, and the content of MgO is 1.5～4.0%.
2. the agglomerate that improves blast-furnace slag viscosity according to claim 1 is characterized in that: each raw material of this agglomerate is by weight ratio: iron-bearing material 75～80%, unslaked lime 3～4%, rhombspar 0～5%, Wingdale 8～10%, light-magnesite powder 0.5～2.5%, coal dust or coke powder 5～7%; The basicity CaO/SiO of this agglomerate simultaneously
2=1.5～3.0, the content of TFe is 53～57%, and the content of MgO is 2.0～2.8%.
3. the agglomerate that improves blast-furnace slag viscosity according to claim 1 and 2 is characterized in that: in the each component of the raw material light-magnesite powder of this agglomerate, the content of MgO is: 80～95%, SiO
2Content be: 2.0～6.0%, all the other are unavoidable impurities, and its burn out rate is 1.5～4.5%.
4. the agglomerate that improves blast-furnace slag viscosity according to claim 1 and 2 is characterized in that: the iron-bearing material of this agglomerate comprises various iron ores, iron ore concentrate, fine iron ore, mixing ore deposit, Za Kuang and their arbitrary combination.
5. described preparation method who improves the agglomerate of blast-furnace slag viscosity of claim 1 comprises following processing step:
1) raw material is equipped with: satisfy basicity CaO/SiO by the agglomerate finished product
2=1.5～3.0, the content of TFe is 50～60%, the content of MgO is 1.5～4.0% requirement, the material component of choosing a kind of concrete numerical value in weight proportion is the scope of iron-bearing material 70～85%, unslaked lime 2～5%, rhombspar 0～8%, Wingdale 5～12%, light-magnesite powder 0.2～5%, coal dust or coke powder 3～8% is standby, wherein: light-magnesite powder, unslaked lime granularity in 0～3mm scope greater than 90%; Wingdale, rhombspar, coal dust or coke fines size in 0～3mm scope greater than 75%, water ratio is less than 15%; The granularity of iron-bearing material is less than 8mm, and water ratio is less than 20%;
2) 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 is controlled between 3～8%, and raw material is mixed;
3) secondary mixes: the raw material that mixes is transported in the secondary drum mixer granulates, the content that makes the feed particles of particle diameter more than 3mm is greater than 60%;
4) cloth: the feed particles after will granulating evenly dispenses on the sintering pallet, and sintering material layer thickness is controlled in the scope of 350～800mm;
5) igniting: the ignition temperature of control sinter machine be 950～1250 ℃, ignition time 1～3min, igniting negative pressure be 4000～6000Pa;
6) sintering: after ignition of sintering process finished, coal dust or coke powder in the raw material took fire, and control sintering negative pressure is 6000～12000Pa;
7) cooling: adopt cooling or the outer cooling mode of machine on any machine, the temperature of agglomerate is reduced to below 150 ℃;
8) screening: adopting sieve aperture is that the vibratory screening apparatus of the 4.5～6mm particle after to cooling process sieves, and screen underflow is a sinter return fine, and screen overflow then is the finished product agglomerate.
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| CN1064107A (en) * | 1992-03-25 | 1992-09-02 | 冶金工业部钢铁研究总院 | Method for preparing pellet sintered ore |
| JPH08239720A (en) * | 1995-03-01 | 1996-09-17 | Sumitomo Metal Ind Ltd | Method for manufacturing sintered ore from ore with high content of water of crystallization |
| CN1138103A (en) * | 1995-06-13 | 1996-12-18 | 承德钢铁公司 | Manufacture method of vanadic titanium type ultra-high basicity agglomerate |
| JPH0913107A (en) * | 1995-06-27 | 1997-01-14 | Sumitomo Metal Ind Ltd | Operation of blast furnace |
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| CN1064107A (en) * | 1992-03-25 | 1992-09-02 | 冶金工业部钢铁研究总院 | Method for preparing pellet sintered ore |
| JPH08239720A (en) * | 1995-03-01 | 1996-09-17 | Sumitomo Metal Ind Ltd | Method for manufacturing sintered ore from ore with high content of water of crystallization |
| CN1138103A (en) * | 1995-06-13 | 1996-12-18 | 承德钢铁公司 | Manufacture method of vanadic titanium type ultra-high basicity agglomerate |
| JPH0913107A (en) * | 1995-06-27 | 1997-01-14 | Sumitomo Metal Ind Ltd | Operation of blast furnace |
| CN1201835A (en) * | 1998-05-29 | 1998-12-16 | 冶金工业部钢铁研究总院 | Production of sintered pelletized minerals |
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| 提高烧结矿中MgO含量的措施及效果分析. 魏群，苏永洪，南祥民.河南冶金，第13卷第5期. 2005 * |
| 添加轻烧氧化镁及氧化铝微粉对镁铝尖晶石轻质耐火材料烧结性能的影响. 孙丽枫，于景坤，姜茂发.工业加热，第34卷第2期. 2005 * |
| 烧结矿中MgO配加方式的改进试验. 薄涛，王新安，方贻留，韩克峰.山东冶金，第24卷第1期. 2002 * |
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