CN104498667A - Slagging method of sintering return mines of continuous steelmaking electric furnace - Google Patents
Slagging method of sintering return mines of continuous steelmaking electric furnace Download PDFInfo
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- CN104498667A CN104498667A CN201410744018.2A CN201410744018A CN104498667A CN 104498667 A CN104498667 A CN 104498667A CN 201410744018 A CN201410744018 A CN 201410744018A CN 104498667 A CN104498667 A CN 104498667A
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- slag
- return fine
- sinter return
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- 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
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention relates to a slagging method of sintering return mines of a continuous steelmaking electric furnace. The slagging method comprises the following steps: firstly recovering small-particle sintering return mines used by a blast furnace in an enterprise as a raw material, wherein the sifted particle size of small-particle sintering return mines is 2-5mm; then charging the sintering return mines into a bulk material elevated cabin; conveying the sintering return mines by virtue of a belt again, and adding the sintering return mines in the furnace in batch in the smelting process; carrying out various chemical reactions on the sintering return mines under the high temperature action of a melting pool so as to generate bubbles and form foam slag; adding the sintering return mines in batch in the steel smelting period in each furnace; before reaction of the front batch is basically finished, adding the next batch after poor foaming of the furnace slag appears, wherein excessive addition can cause strong reaction in the welting pool; and finally, in the smelting process, along with strong carbon oxygen reaction in the melting pool and reduction of FeO in the furnace slag, timely supplementing the sintering return mines. According to the slagging method disclosed by the invention, in the smelting process, the sintering return mines are added into the furnace, the melting point of the furnace slag is lowered, formation of the foaming slag is promoted, the steelmaking process is realized, and the purposes of comprehensively utilizing the mines and lowering the cost are achieved.
Description
Technical field
The invention belongs to steelmaking technical field, relate to one raw-material continuous steelmaking electric furnace sinter return fine slagging method of slag making in steel-making.
Background technology
The requirement of low cost makes Consteel electric furnace progressively move towards converter steel making technique, and molten iron add-on is more and more higher, and molten iron furnace entering volume can reach 960-1000kg/t.The physical thermal of molten iron and chemical heat is relied on to originate as the major heat of steel-making, regulating the thermal equilibrium of smelting process by adding the appropriate raw material such as steel scrap, the pig iron, achieving and adding slag material, continuously scrap steel preheating continuously, add the high-level efficiency fast pace steel-making that molten iron, continuously oxygen supply smelt continuously.And slag is ensureing composition and the quality of the metal melt smelted in smelting process controls, the rate of recovery of metal, the aspects such as the direct motion of smelting operation and every technico-economical comparison are playing conclusive effect.Therefore the slag of having made in smelting process seems most important, if foamy slag can not be formed in time, can cause molten steel splash in converting process, and consume and increase, serious then can cause equipment and process accident.Because iron is than increasing, cancel power transmission and smelt, will form stable slag under the effect not having electric arc has certain difficulty.General employing fluorite is main slag making materials--slagging agent at present.But fluorite consumption is too much, can cause erosion in various degree, what is more important to the resistance to material of furnace lining, petticoat pipe, more and more in short supply along with resource, fluorite price run at high level, causes slag making materials costly, affects production cost.
Summary of the invention
In order to overcome the above-mentioned shortcoming of prior art, the invention provides a kind of meet making foam slag technology requirement while, effectively reduce the consumption of fluorite Mineral resources, meet the continuous steelmaking electric furnace sinter return fine slagging method of dephosphorization, making foamed slag, reduction steel-making cost.
The technical solution adopted for the present invention to solve the technical problems is: a kind of continuous steelmaking electric furnace sinter return fine slagging method, comprises the steps:
The first step: the small-particle agglomerate that returned enterprise inner blast furnace use undersize footpath is 2mm ~ 5mm and sinter return fine make raw material, and the component of this sinter return fine and weight percent thereof are TFe57.36%, SiO
24.72%, CaO10.00%, P0.085%, MgO1.75% and Al
2o
31.79%;
Second step: sinter return fine is loaded balk cargo high compartment;
3rd step: sinter return fine is added in stove in smelting process by belt-conveying in batches;
4th step: sinter return fine, under the high temperature action of molten bath, absorbs heat successively, melts, decomposes, various chemical reaction, and sinter return fine can change the slag system of slag, reduces the fusing point of slag in certain scope, and the smelting temperature of Consteel electric furnace is 1520
0c-1660
0c, can form liquid slag; Reaction formula is FeO+C=Fe+CO ↑ or 2P+5 (FeO)+n (CaO)=CnCaOP
2o
5+ 5Fe, is beneficial to decarburization and dephosphorization, and product C O gas is conducive to forming foamy slag, and product Fe can reduce the consumption of iron and steel stock, produces bubble formation foamy slag;
5th step: every stove steel, in smelting cycle, repeats the 3rd step and the 4th step depending on slag situation, adds sinter return fine in batches, often criticize and add 100-500 Kg;
6th step: treat that front a collection of primitive reaction is complete, slag foamed is bad just adds next batch afterwards, excessively adds membership and makes melt tank reaction violent;
7th step: smelting process along with molten bath reaction between carbon and oxygen violent, in slag, FeO reduces, and when mobility is deteriorated, needs to supplement in time to add sinter return fine, FeO content in slag is controlled 10%-15%.
The invention has the beneficial effects as follows: after directly being utilized by the screen underflow produced enterprises ironmaking material, in smelting process, sinter return fine is added in stove, reduce slag melting, promote the formation of foamy slag, realize steelmaking process, and the object reaching mineral comprehensive utilization and reduce costs.
Embodiment
Below in conjunction with embodiment, the present invention is further described.
A kind of continuous steelmaking electric furnace sinter return fine slagging method, comprises the steps:
The first step: the small-particle agglomerate that returned enterprise inner blast furnace use undersize footpath is 2mm ~ 5mm and sinter return fine make raw material, and the component of this sinter return fine and weight percent thereof are TFe57.36%, SiO
24.72%, CaO10.00%, P0.085%, MgO1.75% and Al
2o
31.79%;
Second step: sinter return fine is loaded balk cargo high compartment;
3rd step: sinter return fine is added in stove in smelting process by belt-conveying in batches;
4th step: sinter return fine, under the high temperature action of molten bath, absorbs heat successively, melts, decomposes, various chemical reaction, and sinter return fine can change the slag system of slag, reduces the fusing point of slag in certain scope, and the smelting temperature of Consteel electric furnace is 1520
0c-1660
0c, can form liquid slag; Reaction formula is FeO+C=Fe+CO ↑ or 2P+5 (FeO)+n (CaO)=CnCaOP
2o
5+ 5Fe, is beneficial to decarburization and dephosphorization, and product C O gas is conducive to forming foamy slag, and product Fe can reduce the consumption of iron and steel stock, produces bubble formation foamy slag;
5th step: every stove steel, in smelting cycle, repeats the 3rd step and the 4th step depending on slag situation, adds sinter return fine in batches, often criticize and add 100-500 Kg;
6th step: treat that front a collection of primitive reaction is complete, slag foamed is bad just adds next batch afterwards, excessively adds membership and makes melt tank reaction violent;
7th step: smelting process along with molten bath reaction between carbon and oxygen violent, in slag, FeO reduces, and when mobility is deteriorated, needs to supplement in time to add sinter return fine, FeO content in slag is controlled 10%-15%.
Embodiment 1:
Certain steel mill implements the calculation of price that first 2011 fluorite consumption ton steel expenses are 5.98 yuan/t(fluorite per ton 1200), after enforcement; Cancel fluorite, the consumption adding sinter return fine is 10kg/t, and unit price is 800 yuan/t, and expense is 10 × 800/1000=8 unit/t.Simultaneously owing to containing TFe:57.36 (%) in sinter return fine, by being analyzed slag, before use sinter return fine, slag TFe content is 14.77%, after use sinter return fine, slag TFe content is 17.56%, by achievement contrast in kind iron and steel stock can fall for consuming 5kg/t, the unit price of steel scrap is by 2500 yuan/t, and it is 5 × 2500 ×/1000=12.5 unit/t that ton steel can be reduced expenses.Total ton steel is cost-saving is: 12.5+5.98-8=10.48 unit/t.Social benefit: make full use of resource, realizes resources conservation, meets national policy.
Embodiment 2:
The Consteel electric furnace four numberings being respectively to 107782,107783,107784 and 107785 adds a certain amount of sinter return fine, and carries out work according to the step in above-mentioned continuous steelmaking electric furnace sinter return fine slagging method, records following parameters:
The situation of sinter return fine that wherein four Consteel electric furnaces add is:
And use present method Consteel electric furnace slag-making material usage:
The terminal sample ingredient of Consteel electrosmelting HRB335 steel grade after use present method
Use the composition of present method slag
Above heat test-results shows: adopt sinter return fine slag making can meet smelting requirements completely as dissolving agent, but promote the use of rear subtract about 5kg/t more monthly than the steel technology before enforcement, the economic benefit using sinter return fine slag making to produce is very considerable, in smelting process, sinter return fine is added in stove, reduce slag melting, promote the formation of foamy slag, realize steelmaking process, and the object reaching mineral comprehensive utilization and reduce costs.
Claims (1)
1. a continuous steelmaking electric furnace sinter return fine slagging method, is characterized in that comprising the steps:
The first step: the small-particle agglomerate that returned enterprise inner blast furnace use undersize footpath is 2mm ~ 5mm and sinter return fine make raw material, and the component of this sinter return fine and weight percent thereof are TFe57.36%, SiO
24.72%, CaO10.00%, P0.085%, MgO1.75% and Al
2o
31.79%;
Second step: sinter return fine is loaded balk cargo high compartment;
3rd step: sinter return fine is added in stove in smelting process by belt-conveying in batches;
4th step: sinter return fine, under the high temperature action of molten bath, absorbs heat successively, melts, decomposes, various chemical reaction, and sinter return fine can change the slag system of slag, reduces the fusing point of slag in certain scope, and the smelting temperature of Consteel electric furnace is 1520
0c-1660
0c, can form liquid slag; Reaction formula is FeO+C=Fe+CO ↑ or 2P+5 (FeO)+n (CaO)=CnCaOP
2o
5+ 5Fe, is beneficial to decarburization and dephosphorization, and product C O gas is conducive to forming foamy slag, and product Fe can reduce the consumption of iron and steel stock, produces bubble formation foamy slag;
5th step: every stove steel, in smelting cycle, repeats the 3rd step and the 4th step depending on slag situation, adds sinter return fine in batches, often criticize and add 100-500 Kg;
6th step: treat that front a collection of primitive reaction is complete, slag foamed is bad just adds next batch afterwards, excessively adds membership and makes melt tank reaction violent;
7th step: smelting process along with molten bath reaction between carbon and oxygen violent, in slag, FeO reduces, and when mobility is deteriorated, needs to supplement in time to add sinter return fine, FeO content in slag is controlled 10%-15%.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104878157A (en) * | 2015-07-03 | 2015-09-02 | 衡阳华菱钢管有限公司 | High ratio hot metal charging electric furnace smelting method using sintered ore as modifier |
| CN105944965A (en) * | 2016-06-21 | 2016-09-21 | 中国钢研科技集团有限公司 | Non-return-ore sintering method and device |
| CN109897940A (en) * | 2019-04-28 | 2019-06-18 | 阳春新钢铁有限责任公司 | Method for melting slag by using returned ore powder |
| CN110629017A (en) * | 2019-10-16 | 2019-12-31 | 广东韶钢松山股份有限公司 | Sintered iron-containing material, sintered composition, sintered ore and method for producing same |
| CN112062545A (en) * | 2020-07-30 | 2020-12-11 | 玉溪新兴钢铁有限公司 | Iron-dust-containing mud ball and preparation method and application thereof |
| CN112143850A (en) * | 2019-06-28 | 2020-12-29 | 张家港宏昌钢板有限公司 | Sintered ore for electric furnace washing of smelting cord steel and furnace washing method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102978337A (en) * | 2012-12-27 | 2013-03-20 | 广东韶钢松山股份有限公司 | Method for slagging by using limestone for continuous steelmaking furnace |
| CN102994693A (en) * | 2013-01-07 | 2013-03-27 | 广东韶钢松山股份有限公司 | Cold setting pellet slagging method for continuous steelmaking electric furnace |
-
2014
- 2014-12-09 CN CN201410744018.2A patent/CN104498667A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102978337A (en) * | 2012-12-27 | 2013-03-20 | 广东韶钢松山股份有限公司 | Method for slagging by using limestone for continuous steelmaking furnace |
| CN102994693A (en) * | 2013-01-07 | 2013-03-27 | 广东韶钢松山股份有限公司 | Cold setting pellet slagging method for continuous steelmaking electric furnace |
Non-Patent Citations (1)
| Title |
|---|
| 王水文 等: ""韶钢8号高炉节能减排生产实践"", 《2010年全国炼铁新技术应用及节能减排研讨会》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104878157A (en) * | 2015-07-03 | 2015-09-02 | 衡阳华菱钢管有限公司 | High ratio hot metal charging electric furnace smelting method using sintered ore as modifier |
| CN105944965A (en) * | 2016-06-21 | 2016-09-21 | 中国钢研科技集团有限公司 | Non-return-ore sintering method and device |
| CN109897940A (en) * | 2019-04-28 | 2019-06-18 | 阳春新钢铁有限责任公司 | Method for melting slag by using returned ore powder |
| CN109897940B (en) * | 2019-04-28 | 2021-07-30 | 阳春新钢铁有限责任公司 | Method for melting slag by using returned ore powder |
| CN112143850A (en) * | 2019-06-28 | 2020-12-29 | 张家港宏昌钢板有限公司 | Sintered ore for electric furnace washing of smelting cord steel and furnace washing method thereof |
| CN110629017A (en) * | 2019-10-16 | 2019-12-31 | 广东韶钢松山股份有限公司 | Sintered iron-containing material, sintered composition, sintered ore and method for producing same |
| CN112062545A (en) * | 2020-07-30 | 2020-12-11 | 玉溪新兴钢铁有限公司 | Iron-dust-containing mud ball and preparation method and application thereof |
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Application publication date: 20150408 |