CN102002550A - Slag modifier for converter refining - Google Patents
Slag modifier for converter refining Download PDFInfo
- Publication number
- CN102002550A CN102002550A CN2010105797657A CN201010579765A CN102002550A CN 102002550 A CN102002550 A CN 102002550A CN 2010105797657 A CN2010105797657 A CN 2010105797657A CN 201010579765 A CN201010579765 A CN 201010579765A CN 102002550 A CN102002550 A CN 102002550A
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- China
- Prior art keywords
- slag
- refining
- converter
- supplying agent
- steel
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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
Abstract
The invention relates to a slag modifier for converter refining, which comprises the following components by mass percentage: 0-6.0 of CaO, 48-58 of Al2O3, 0-12 of SiO2, 20-25 of Al, and the balance of inevitable impurities. By adding the slag modifier in the processes of tapping, refining and slagging of a converter, the deoxidation cost in the steel making process can be reduced, the desulfurization degree of steel water in the tapping process of the converter can be increased, the slagging time of white line slag refined by a ladle furnace can be shortened, the refining effect can be improved, the oxidizability of refined early slag can be reduced, and the purity of the steel water can be enhanced.
Description
Technical field
The present invention relates to steelmaking slagging technology, particularly the converter refining slag supplying agent.
Technical background
Each steel mill all make great efforts to set up efficiently, Clean Steel production platform cheaply, adding slag supplying agent to molten steel in the tapping process is one of Clean Steel production effective means.The converter operation adds lime in the molten steel tapping process in steel and slag supplying agent is in order to obtain suitable first slag before making molten steel enter refining procedure.
Conventional converter steelmaking furnace rear refining technology materials are that reductor adds refining slag, but to enter the converter finishing slag quantity of slag of ladle bigger because of the slag of tapping down, and the oxidisability height has destroyed the original composition of refining slag, the every molten steel purifying index of the refining slag that weakened.Prior art mainly contains following weak point: the first, and cost is higher, the large usage quantity of reductor; The second, the first slag oxidisability that adds back formation is unfavorable for the raising of molten steel purity and the anti-material of ladle is had bigger erosional competency than higher; The 3rd, the ability of first slag dross inclusion adsorption is not very strong.
Summary of the invention
The present invention aims to provide a kind of converter refining slag supplying agent that overcomes above-mentioned prior art weak point.This slag supplying agent is used for adding in converter tapping process and refining slag making, can reduce the deoxidation cost of steelmaking process, improve the molten steel desulfurizing rate in the converter tapping process, shorten ladle furnace refining white slag sludging time, improve refining effect, reduce the oxidisability of refining first slag, improve the molten steel purity.
The present invention is achieved in that the converter refining slag supplying agent, and the mass percent of its moiety is CaO=0～6.0, Al
2O
3=48～58, SiO
2=0～12, Al=20～25, surplus is inevitable impurity.
Further, the moisture H of slag supplying agent
2O≤1.0; Size range in the slag supplying agent is at 15 ~ 60mm.
Add lime and slag supplying agent in the converter tapping process in following ratio: lime 85% ~ 90%, slag supplying agent 8% ~ 12%; In LF stove refining process, add lime and slag supplying agent in following ratio: lime 70% ~ 75%, slag supplying agent 25% ~ 30%.The oxidisability of ladle slag is reduced, and basicity improves, and has surface tension, viscosity and foaming, storage bubble performance, and FeO+MnO reduction amplitude reaches 30% in the slag, and S content improves 1.1 times in the slag, does not corrode ladle.At further LF stove refining process, make the submerged arc better effects if of steel, deoxidation, desulfurization degree height, dross inclusion adsorption is many, the thermo-efficiency height, power consumption is low, and refining effect is good.
Slag supplying agent of the present invention is based on the mechanical mixture of aluminium sesquioxide and fine aluminium, in pelletized form, tapping process, add in the ladle in the lump by charging system from the furnace roof high hopper with alloy, can very fast fusing and with steel in oxygen and the FeO in the slag, Fe2O3 take place to send out should, remove the oxygen in the steel and reduce FeO and Fe2O3 in the slag blanket, make all iron content in the slag drop to 5.43% ~ 8.72% this suitable level, smelt recovery rate, reduce the oxidisability of advancing the preceding slag of refining thereby reach raising.Because effectively strong deoxidant element aluminium content is higher in the slag supplying agent, and molten steel and slag are had strong deoxidizing capacity, can substitute the part reductor, reduces production costs.Contain proper A l in the slag supplying agent
2O
3Composition, can be fast under the impact stirring action of steel stream and lime form first slag low-melting, that the dross inclusion adsorption ability is strong.Wash heat effect by slag supplying agent in the tapping process can also remove the sulphur about 50%, can form the refining first slag of good fluidity, has significantly reduced the change slag time of ladle refining furnace, improves and smelts efficient.
Of the present invention applying can be strengthened Clean Steel smelting means effectively, improves the steel final product quality rapidly with low-cost, high-level efficiency technology, further promotes the raising of steel products total quality.
Embodiment
The converter refining slag supplying agent, its composition quality per-cent (%) is: CaO=0～6.0, Al
2O
3=48～58, SiO
2=0～12, Al=20～25, surplus is inevitable impurity.
The preparation method: with alumina clay into power earlier shape and and aluminium bits mix, add an amount of common bond then and stir evenly,, then pressure ball is toasted its briquetting glomeration with special machinery, reduce the water content of briquetting, the intensity of increase briquetting.
Concrete using method: with the slag supplying agent converter furnace roof high hopper of packing into, add in the ladle by charging system in the lump with alloy in the tapping process, form the refining first slag at ladle after having gone out steel, advance ladle refining furnace and add lime and slag supplying agent more according to a certain percentage, can very fast formation good fluidity, refining slag that sweetening power is strong.Have that related parameter sees Table 1, table 2.
Present embodiment carries out in 120 tons of converters and ladle furnace production process, in tapping process, pour steel stream from converter top filling system adding 100 ~ 150kg slag supplying agent and 800kg lime, can form the refining first slag of one deck molten state after the tapping fast at molten steel surface with alloy.Molten steel advances the slag supplying agent of adding behind the ladle furnace refining about 300 ~ 500kg lime and 150kg, send the electricity back 7 ~ 8 minutes can very fast formation white slag, and the slag submerged arc is effective, and mobile suitable, the dross inclusion adsorption ability is strong.After using novel slag supplying agent, before refining furnace first slag all iron content is used by slag supplying agent 12% has been reduced to present 7.01%, converter tapping process desulfurization degree has brought up to present 49% by 40% before using, the use cost of ton killer is by 21 yuan of/ton 18 yuan/ton of being reduced to after using that use before the slag supplying agent, ladle furnace becomes the white slag time also to be reduced to 7.5 minutes after the use by 14 minutes before the use slag supplying agent, has improved refining effect greatly.
The slag supplying agent actual constituent that table 1 uses
Refining first slag, desulfurization and ladle furnace white slag form situation behind the table 2 adding slag supplying agent
Claims (1)
1. converter refining slag supplying agent, it is characterized in that: the mass percent of moiety is CaO=0～6.0, Al
2O
3=48～58, SiO
2=0～12, Al=20～25, H
2O≤1.0, surplus are inevitable impurity; Size range is at 15～60mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105797657A CN102002550A (en) | 2010-12-09 | 2010-12-09 | Slag modifier for converter refining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105797657A CN102002550A (en) | 2010-12-09 | 2010-12-09 | Slag modifier for converter refining |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102002550A true CN102002550A (en) | 2011-04-06 |
Family
ID=43810252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105797657A Pending CN102002550A (en) | 2010-12-09 | 2010-12-09 | Slag modifier for converter refining |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102002550A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102181605A (en) * | 2011-04-07 | 2011-09-14 | 重庆钢铁(集团)有限责任公司 | Molten steel deoxidizing modifier |
| CN102220456A (en) * | 2011-07-28 | 2011-10-19 | 郑州东升冶金新材料有限公司 | Submerged arc refining slag and preparation method thereof |
| CN102304605A (en) * | 2011-09-01 | 2012-01-04 | 山西太钢不锈钢股份有限公司 | High-alkalinity deoxidation refining slag |
| CN105112651A (en) * | 2015-09-28 | 2015-12-02 | 攀枝花钢城集团有限公司 | High-aluminum slag modifier pellets and production method thereof |
| CN105950828A (en) * | 2016-07-04 | 2016-09-21 | 湖南华菱湘潭钢铁有限公司 | Method of shortening smelting time of molten steel entering LF furnace |
| CN108384917A (en) * | 2018-03-03 | 2018-08-10 | 首钢集团有限公司 | A kind of converter is followed by the modification agent and application method of the anti-slag crust of RH vacuum |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1201072A (en) * | 1998-04-07 | 1998-12-09 | 幸超 | Aluminium-contained premelting slag and preparation method therefor, and molten steel desulfurizer and purifier containing same |
| CN1286312A (en) * | 2000-04-29 | 2001-03-07 | 幸超 | Slag modifier for refining molten steel |
| CN1775961A (en) * | 2005-10-11 | 2006-05-24 | 梅一峰 | Prefused refined slag modified aluminium slag ball and its preparing method |
-
2010
- 2010-12-09 CN CN2010105797657A patent/CN102002550A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1201072A (en) * | 1998-04-07 | 1998-12-09 | 幸超 | Aluminium-contained premelting slag and preparation method therefor, and molten steel desulfurizer and purifier containing same |
| CN1286312A (en) * | 2000-04-29 | 2001-03-07 | 幸超 | Slag modifier for refining molten steel |
| CN1775961A (en) * | 2005-10-11 | 2006-05-24 | 梅一峰 | Prefused refined slag modified aluminium slag ball and its preparing method |
Non-Patent Citations (1)
| Title |
|---|
| 《2007中国钢铁年会论文集》 20071231 彭其春等 涟钢高铝渣取代预熔渣调渣剂工艺工业试验 1 , 2 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102181605A (en) * | 2011-04-07 | 2011-09-14 | 重庆钢铁(集团)有限责任公司 | Molten steel deoxidizing modifier |
| CN102220456A (en) * | 2011-07-28 | 2011-10-19 | 郑州东升冶金新材料有限公司 | Submerged arc refining slag and preparation method thereof |
| CN102304605A (en) * | 2011-09-01 | 2012-01-04 | 山西太钢不锈钢股份有限公司 | High-alkalinity deoxidation refining slag |
| CN105112651A (en) * | 2015-09-28 | 2015-12-02 | 攀枝花钢城集团有限公司 | High-aluminum slag modifier pellets and production method thereof |
| CN105950828A (en) * | 2016-07-04 | 2016-09-21 | 湖南华菱湘潭钢铁有限公司 | Method of shortening smelting time of molten steel entering LF furnace |
| CN108384917A (en) * | 2018-03-03 | 2018-08-10 | 首钢集团有限公司 | A kind of converter is followed by the modification agent and application method of the anti-slag crust of RH vacuum |
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Application publication date: 20110406 |