CN102251064A - Method for improving high-aluminum slag fluidity in blast furnace ironmaking process - Google Patents
Method for improving high-aluminum slag fluidity in blast furnace ironmaking process Download PDFInfo
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- CN102251064A CN102251064A CN 201110190772 CN201110190772A CN102251064A CN 102251064 A CN102251064 A CN 102251064A CN 201110190772 CN201110190772 CN 201110190772 CN 201110190772 A CN201110190772 A CN 201110190772A CN 102251064 A CN102251064 A CN 102251064A
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Abstract
The invention relates to a method for improving high-aluminum slag fluidity in a blast furnace ironmaking process, which comprises the following steps: by partially replacing iron ore powder with boron-containing concentrate, making 8-27 wt% of boron-containing iron concentrate containing more than 50% of Fe and less than 10% of B2O3, 8-15 wt% of solvent, 2.5-4.5% of fuel and 53-82% of iron ore powder into a mixture; transporting the mixture into a sintering machine to carry out sintering; after sintering, crushing, screening and cooling to obtain boron-containing sintered ore of which the particle size is 5-50mm; and putting 75-100% of boron-containing sintered ore and 0-25% of iron ore and/or pellet into a blast furnace, thereby keeping the fusible temperature of the blast furnace slag at 1250-1350 DEG and effectively improving the high-aluminum slag fluidity in a blast furnace ironmaking process. The method implements separation of boron and iron in the boron-containing iron concentrate; and the invention can develop and utilize large-reserves low-price paigeite in China, and can also solve the problems of thick furnace slag and poor desulfurization effect of molten iron since part of blast furnaces smelt high-aluminum slag.
Description
Technical field
The invention belongs to the ironmaking field, relate to and utilize paigeite instead of part iron ore to go into blast furnace to carry out blast-furnace smelting, thereby improve in the blast furnace ironmaking process the especially method of high alumina slag flowability of blast furnace slag.
Background technology
China's boron resource is abundanter, accounts for 16% of world's boron rock reserves, and great majority exist with the form of paigeite, and main component has: Fe 27%～30%, B
2O
36%～7.5%, MgO 20%～24%, SiO
210%～14%, its B
2O
3Reserves account for 58% of national total reserves.Paigeite is formed complicated, the multielement symbiosis, and the edge cloth of iron and boron is very thin, must could use through ore dressing.
Paigeite can obtain boron concentrate (B after ore dressing
2O
3＞10%) and boron-containing iron concentrate (Fe＞50%, B
2O
3＜10%),, can not carry boron as the boracic raw material because the enrichment degree of boron is not enough in the boron-containing iron concentrate.If directly enter blast-furnace smelting as iron-bearing material, the blast furnace energy consumption is increased, the slag unstable properties is brought problems to smelting.Therefore, the development and use of paigeite resource still remain to be studied.
On the other hand, in blast furnace ironmaking was now produced, iron-bearing material is shortage day by day, and Ore Imported comes into operation in a large number; Fall Jiao for energy-conservation, blast furnace is also constantly being pursued high injecting coal quantity.But the coal dust of import ore deposit (Ru Aokuang, India ore deposit) and winding-up all can be brought a large amount of Al of blast furnace into
2O
3, make Al in the blast furnace slag
2O
3Roll up and become high alumina slag.
Melting temperature is higher to be exactly the topmost problem that high alumina slag faces.After the high alumina slag of some steel mills was measured, its result showed, Al
2O
3Content in blast furnace slag reaches at 15% o'clock, and its melting temperature is greater than 1360 ℃, some in addition reach 1380 ℃; If the Al in the slag
2O
3Content reaches 17%, and its melting temperature is then near 1400 ℃.Energy consumption height, blast wandering, degradation problem under slag thickness and the sweetening power just appear smelting this moment easily.
Summary of the invention
In order to address the above problem, to the purpose of this invention is to provide and smelt a kind of boron-containing iron concentrate is added in the blast furnace as the part iron-bearing material, thereby improve in the blast furnace ironmaking process the especially method of high alumina slag flowability of blast furnace slag.
Technical scheme of the present invention is: a kind of method of improving high alumina slag flowability in the blast furnace ironmaking process.
The present invention includes following steps: at first, in the blast furnace ironmaking process, utilize boron-containing iron concentrate partly to replace powdered iron ore, with account for mass percent be 8-27% contain Fe＞50%, B
2O
3＜10% boron-containing iron concentrate, to account for solvent that mass percent is 8-15%, account for mass percent be the fuel of 2.5-4.5% and to account for mass percent be that the powdered iron ore of 53-82% is made compound, compound transported to sinter machine carry out cloth, igniting, sintering; The agglomerate of making is carried out fragmentation, screening, cooling obtain meet the boracic agglomerate that blast-furnace smelting require of granularity at 5mm～50mm, standby;
Secondly, the boracic agglomerate 75-100% that drops into iron-bearing material in the blast furnace will be accounted for, the iron ore and/or the pellet that account for 0-25% are mixed into blast-furnace smelting, the melting temperature of blast furnace slag can be remained on 1250 ℃～1350 ℃ thus, and can effectively improve high alumina slag flowability in the blast furnace ironmaking process.
The corresponding relation of boron content (B) % in the melting temperature of slag and the slag will come to determine by experiment: the former slag of getting blast furnace is allocated different gradient amount B into
2O
3Carry out the viscosimetric analysis experiment, determine melting temperature, can obtain the corresponding relation of boron content (B) % in different melting temperatures and the slag.So just can infer boron content (B) % that needs in slagging tap according to the requirement difference of different blast furnaces to the slag melting temperature.Experimental result shows that also the melting temperature of blast furnace slag is when 1250 ℃～1350 ℃ proper range, and boron content (B) % in the slag should be controlled at 0.5%～1.5%.
Aforesaid method can be determined boron content (B) % in the slag according to the required slag fusing type temperature of blast furnace.The source of boron is a boron-containing iron concentrate, because boron-containing iron concentrate is the granularity very thin breeze of paigeite through obtaining after the ore dressing, can not directly use as blast furnace raw material, therefore boron-containing iron concentrate will be allocated in the raw materials for sintering and be mixed and made into agglomerate with powdered iron ore, its amount of allocating into will obtain through further calculating to push over.Below be the calculation formula of the per-cent of allocating the boron-containing iron concentrate in the raw materials for sintering (comprising powdered iron ore, solvent, fuel etc.) into derived according to boron-containing iron concentrate composition and blast-furnace smelting parameter:
Wherein:
---allocate the per-cent of the boron-containing iron concentrate in the raw materials for sintering into
The slag iron ratio of k---blast furnace
---blast furnace on average go into the stove grade
(B) %---needed boron content in the slag
w
S---agglomerate accounts for into the stove iron-bearing material per-cent of (comprising agglomerate, pellet and iron ore)
1. just can obtain allocating into of boron-containing iron concentrate by formula by boron content (B) % in the slag.The reasonable value scope 0.5%～1.5% of (B) % is brought in the above-mentioned formula, derive the per-cent of allocating the boron-containing iron concentrate in the raw materials for sintering (comprising powdered iron ore, solvent, fuel etc.) in the industrial production into according to the correlation parameter of ordinary blast and should be 8%～27%.
Principle of the present invention is: utilize B
2O
3Can be at SiO
2-CaO-MgO-Al
2O
3Produce the low melting point mineral in the system, the melting temperature of whole system is reduced, thereby make boron in high alumina slag, play the effect of fusing assistant, improve the flowability of high alumina slag, especially can reach significant effect aspect the blast furnace slag melting temperature reducing; On the other hand, in blast furnace iron-making process, the melting temperature of slag should maintain in the suitable scope, and the melting temperature of ordinary blast slag is generally 1250 ℃～1350 ℃, has determined the content of boron in high alumina slag also to want limited range thus.
The invention has the beneficial effects as follows: adopt aforesaid method to realize separating of boron and iron in the boron-containing iron concentrate.Can either develop the big and low-cost paigeite of China's reserves like this, can solve the part blast furnace again and smelt the slag thickness that brings by high alumina slag, the problem of desulfurizing iron weak effect has reached the effect of killing two birds with one stone.
Description of drawings
Fig. 1 is a logical organization block diagram of the present invention.
Fig. 2 is the change curve synoptic diagram of viscosity with temperature of the slag of embodiments of the invention 1.
Embodiment
Listing some specific embodiments below is described further technical scheme of the present invention.
Embodiments of the invention obtain by carry out industrial experiment on the sintering plant of certain steel mill and blast furnace.
The experimental installation that embodiments of the invention need adopt is the RTW-[h1 that Northeastern University produces] type physical properties of melt comprehensive tester carries out slag viscosity and measures, and logical argon shield when measuring.
Before carrying out industrial experiment, the main component of the blast furnace slag that this blast-furnace smelting is produced is for containing SiO
233.15%, CaO 39.17%, and MgO 7.24%, Al
2O
316.29%.Because Al
2O
3Content reached more than 16%, so can be regarded as high alumina slag.Recording its melting temperature through experiment is 1365 ℃.The scheme of industrial experiment is to substitute the part powdered iron ore as raw materials for sintering with boron-containing iron concentrate, and other technologies are constant substantially.
Example 1:
Utilize vibratory screening apparatus screening boron-containing iron concentrate earlier, guarantee that its granularity is all below 10mm; Utilize disk feeder to join the ore deposit boron-containing iron concentrate after sieving and other raw materials for sintering, proportioning is: boron-containing iron concentrate 9%, powdered iron ore 78%, fuel 3.5%(are mainly coke powder), solvent 9.5%(comprises Wingdale 2.2%, rhombspar 2.1%, unslaked lime 5.2%); The material for preparing transported to add water in the cylindrical mixer and carry out one mixed two and mix; Compound is transported to sinter machine carry out cloth, igniting, sintering; The agglomerate of making is carried out fragmentation, screening, cooling obtain meet the boracic agglomerate that blast-furnace smelting require of granularity at 5mm～50mm.
The boracic agglomerate will cooperate to put in the blast furnace with a small amount of pellet to be smelted, and the boracic agglomerate accounts for 85% in going into the iron-bearing material of stove, and pellet accounts for 15%.Other operations of blast-furnace smelting are all carried out according to normal smelting.After smelting parameter is stable, get the blast furnace slag research that experimentizes.
In the laboratory, getting blast furnace slag 140g puts into the physical properties of melt comprehensive tester and is heated to 1520 ℃ and changes slags, stir evenly, the viscosity of METHOD FOR CONTINUOUS DETERMINATION slag in process of cooling, finally make the change curve of the viscosity with temperature of slag, it promptly is the melting temperature (seeing accompanying drawing 2) of this slag that the temperature that viscograph is corresponding with the point of contact of 45o tangent line is 1310 ℃.This shows, be 9% o'clock if the boron-containing iron concentrate of allocating in industrial production accounts for the per-cent of raw materials for sintering, and the melting temperature of slag is about 1345 ℃.
Example 2:
Utilize vibratory screening apparatus screening boron-containing iron concentrate earlier, guarantee that its granularity is all below 10mm; Utilize disk feeder to join the ore deposit boron-containing iron concentrate after sieving and other raw materials for sintering, proportioning is: boron-containing iron concentrate 17%, powdered iron ore 70%, fuel 3.5%(are mainly coke powder), solvent 9.5%(comprises Wingdale 2.2%, rhombspar 2.1%, unslaked lime 5.2%); The material for preparing transported to add water in the cylindrical mixer and carry out one mixed two and mix; Compound is transported to sinter machine carry out cloth, igniting, sintering; The agglomerate of making is carried out fragmentation, screening, cooling obtain meet the boracic agglomerate that blast-furnace smelting require of granularity at 5mm～50mm.
The boracic agglomerate will cooperate to put in the blast furnace with a small amount of pellet to be smelted, and the boracic agglomerate accounts for 85% in going into the iron-bearing material of stove, and pellet accounts for 15%.Other operations of blast-furnace smelting are all carried out according to normal smelting.After smelting parameter is stable, get the blast furnace slag research that experimentizes.
In the laboratory, getting blast furnace slag 140g puts into the physical properties of melt comprehensive tester and is heated to 1520 ℃ and changes slags, stir evenly, the viscosity of METHOD FOR CONTINUOUS DETERMINATION slag in process of cooling, finally make the change curve of the viscosity with temperature of slag, it promptly is the melting temperature of this slag that the temperature that viscograph is corresponding with the point of contact of 45o tangent line is 1310 ℃.This shows, be 17% o'clock if the boron-containing iron concentrate of allocating in industrial production accounts for the per-cent of raw materials for sintering, and the melting temperature of slag is reduced to 1310 ℃.
Example 3:
Utilize vibratory screening apparatus screening boron-containing iron concentrate earlier, guarantee that its granularity is all below 10mm; Utilize disk feeder to join the ore deposit boron-containing iron concentrate after sieving and other raw materials for sintering, proportioning is: boron-containing iron concentrate 24%, powdered iron ore 63%, fuel 3.5%(are mainly coke powder), solvent 9.5%(comprises Wingdale 2.2%, rhombspar 2.1%, unslaked lime 5.2%); The material for preparing transported to add water in the cylindrical mixer and carry out one mixed two and mix; Compound is transported to sinter machine carry out cloth, igniting, sintering; The agglomerate of making is carried out fragmentation, screening, cooling obtain meet the boracic agglomerate that blast-furnace smelting require of granularity at 5mm～50mm.
The boracic agglomerate will cooperate to put in the blast furnace with a small amount of pellet to be smelted, and the boracic agglomerate accounts for 85% in going into the iron-bearing material of stove, and pellet accounts for 15%.Other operations of blast-furnace smelting are all carried out according to normal smelting.After smelting parameter is stable, get the blast furnace slag research that experimentizes.
In the laboratory, getting blast furnace slag 140g puts into the physical properties of melt comprehensive tester and is heated to 1520 ℃ and changes slags, stir evenly, the viscosity of METHOD FOR CONTINUOUS DETERMINATION slag in process of cooling, finally make the change curve of the viscosity with temperature of slag, it promptly is the melting temperature of this slag that the temperature that viscograph is corresponding with the point of contact of 45o tangent line is 1310 ℃.This shows, be 24% o'clock if the boron-containing iron concentrate of allocating in industrial production accounts for the per-cent of raw materials for sintering, and the melting temperature of slag can be reduced to 1270 ℃.
Claims (1)
1. method of improving high alumina slag flowability in the blast furnace ironmaking process is characterized in that may further comprise the steps: at first, in the blast furnace ironmaking process, utilize boron-containing iron concentrate partly to replace powdered iron ore, with account for mass percent be 8-27% contain Fe＞50%, B
2O
3＜10% boron-containing iron concentrate, to account for solvent that mass percent is 8-15%, account for mass percent be the fuel of 2.5-4.5% and to account for mass percent be that the powdered iron ore of 53-82% is made compound, compound transported to sinter machine carry out cloth, igniting, sintering; The agglomerate of making is carried out fragmentation, screening, cooling obtain meet the boracic agglomerate that blast-furnace smelting require of granularity at 5mm～50mm, standby;
Secondly, the boracic agglomerate 75-100% that drops into iron-bearing material in the blast furnace will be accounted for, the iron ore and/or the pellet that account for 0-25% are mixed into blast-furnace smelting, the melting temperature of blast furnace slag can be remained on 1250 ℃～1350 ℃ thus, and can effectively improve high alumina slag flowability in the blast furnace ironmaking process.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103276126A (en) * | 2013-06-05 | 2013-09-04 | 北京科技大学 | Method for improving liquidity of high titanium slag in blast furnace smelting vanadium titano-magnetite |
| TWI563095B (en) * | 2015-05-05 | 2016-12-21 | China Steel Corp | Method for controlling a blast furnace having high aluminum slag |
| CN106834574A (en) * | 2017-02-24 | 2017-06-13 | 本钢板材股份有限公司 | One kind is colded pressing boracic pelletizing blast furnace prepurging solvent and its preparation, application method |
| CN109439820A (en) * | 2018-11-29 | 2019-03-08 | 安徽工业大学 | A kind of blast furnace process raw material and its smelting process |
| CN110453024A (en) * | 2019-09-19 | 2019-11-15 | 攀钢集团攀枝花钢铁研究院有限公司 | Boracic slag system containing manganese for blast furnace process |
| CN111638155A (en) * | 2020-05-25 | 2020-09-08 | 北京科技大学 | Ore blending structure evaluation method based on granulation quasi-particle sintering behavior |
| CN115418424A (en) * | 2022-09-29 | 2022-12-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Blowing method for improving performance of high-titanium slag in schreyerite smelting |
-
2011
- 2011-07-08 CN CN 201110190772 patent/CN102251064A/en active Pending
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Cited By (9)
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|---|---|---|---|---|
| CN103276126A (en) * | 2013-06-05 | 2013-09-04 | 北京科技大学 | Method for improving liquidity of high titanium slag in blast furnace smelting vanadium titano-magnetite |
| CN103276126B (en) * | 2013-06-05 | 2015-04-08 | 北京科技大学 | Method for improving liquidity of high titanium slag in blast furnace smelting vanadium titano-magnetite |
| TWI563095B (en) * | 2015-05-05 | 2016-12-21 | China Steel Corp | Method for controlling a blast furnace having high aluminum slag |
| CN106834574A (en) * | 2017-02-24 | 2017-06-13 | 本钢板材股份有限公司 | One kind is colded pressing boracic pelletizing blast furnace prepurging solvent and its preparation, application method |
| CN109439820A (en) * | 2018-11-29 | 2019-03-08 | 安徽工业大学 | A kind of blast furnace process raw material and its smelting process |
| CN110453024A (en) * | 2019-09-19 | 2019-11-15 | 攀钢集团攀枝花钢铁研究院有限公司 | Boracic slag system containing manganese for blast furnace process |
| CN111638155A (en) * | 2020-05-25 | 2020-09-08 | 北京科技大学 | Ore blending structure evaluation method based on granulation quasi-particle sintering behavior |
| CN111638155B (en) * | 2020-05-25 | 2022-05-13 | 北京科技大学 | Ore blending structure evaluation method based on granulation quasi-particle sintering behavior |
| CN115418424A (en) * | 2022-09-29 | 2022-12-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Blowing method for improving performance of high-titanium slag in schreyerite smelting |
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Application publication date: 20111123 |