CN102041357A - Novel method for making white slag with LF (ladle furnace) refining furnace - Google Patents
Novel method for making white slag with LF (ladle furnace) refining furnace Download PDFInfo
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- CN102041357A CN102041357A CN2010105976731A CN201010597673A CN102041357A CN 102041357 A CN102041357 A CN 102041357A CN 2010105976731 A CN2010105976731 A CN 2010105976731A CN 201010597673 A CN201010597673 A CN 201010597673A CN 102041357 A CN102041357 A CN 102041357A
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- slag
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- ladle
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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 discloses a method for making white slag with an LF (ladle furnace) refining furnace. The method comprises the following steps: after successful arc striking of an electrode under LF refining, adding 2.0-4.0 kg of calcium-aluminum ball per ton of steel into the molten steel; refining for 1-2 minutes, and adding 6-10.0 kg of lime mud per ton of steel into the molten steel; and refining for 1-5 minutes, and adding 1.0-3.0 kg of an Al2O3-containing auxiliary material per ton of steel into the ladle to further improve the slagging speed. The slagging method disclosed by the invention has the beneficial effects that: rapid whitening of the slag can be ensured within short time, the indexes of the slag components meet the requirements on impurity adsorption of a low-melting point slag system, the addition of other slag materials is reduced, the cost is low, and the smelting time can be shortened.
Description
Technical field
The invention belongs to LF refining slag making technical field, be specifically related to the method that a kind of novel LF refining furnace is made white slag.
Background technology
At present, the purpose of LF refining furnace slag making is mainly inclusion in the abundant absorption molten steel, plays the purpose of purify hot metal.But domestic slag making technology commonly used at present mainly is to take lime, bauxitic clay or fluorite slag making, its slagging speed is slow, and reach certain slag index (basicity 5～8, TFe, Al2O3), the slag charge that expends is big, often get half the result with twice the effort, can not well play the purpose of LF refining slag making, the molten steel purity is often lower, up-to-standard rate is lower when smelting high-level steel grade, and ton steel cost is expensive bigger.
Summary of the invention
Traditional LF refining furnace slag making speed is slow in order to overcome, the slag consumption is big, the phenomenon of weak effect, the invention provides a kind of novel LF refining furnace and make the method for white slag, slag making materials adopts calcium aluminium ball, this calcium aluminium ball is slagging fast in the short period of time not only, and can help rapid slag in other slag charges (as lime) short period of time, make white slag fast for the LF refining and create conditions; This slag making materials calcium aluminium ball can improve basicity of slag, improve Al2O3 content in the slag simultaneously, saves lime greatly and other contains Al2O3 auxiliary material add-on, reduces a ton steel cost of supplementary product significantly.
For achieving the above object, the method that the present invention adopts is: after the LF refining lower electrode striking success, add earlier the calcium aluminium ball of 2.0～4.0Kg/t steel in molten steel, behind adding back refining 1～2min, add the lime slag charge in molten steel again, add-on is controlled at the steel at 6～10.0Kg/t; Treat that then refining 1～5min the inside in ladle adds the auxiliary material that contains Al2O3 of 1.0～3.0Kg/t steel, with further raising slag speed.
Ratio (conventional proportioning is CaO content 45～50%, Al2O3 content 40～45%) by rational proportion CaO and Al2O3 content, make it when 1500 ℃ of left and right sides, can form low melting point calcium aluminate slag system fast, then the calcium aluminium ball of working good is joined the ladle the inside, add-on is controlled at 2.0～4.0Kg/t steel; Waiting slag fully the back (about 1～2min), add the lime slag charge again, add-on is controlled at 6～10.0Kg/t steel, adds the auxiliary material that 1.0～3.0Kg contains Al2O3 to the slag charge the inside when treating the refining 2min left and right sides then, with further raising slag speed.After treating that above-mentioned various slag making material adds, in refining process, require to add reductor according to routine, can guarantee that slag bleaches in 10min, in follow-up refining process, be interrupted the interpolation reductor then and keep white slag, fully to reach slag absorption molten steel inclusion purpose.Its final slag Composition Control exists: CaO content 55～60%, Al2O3 content 35～40%, SiO2 content＜8%, TFe content≤0.5%.
The beneficial effect of slagging method of the present invention is: can guarantee at short notice that slag bleaches fast, the slag composition index meets the requirement of low melting point slag system dross inclusion adsorption, save other slag charge add-on, and with low cost, can shorten the heat simultaneously.
Embodiment
The method that the present invention adopts is: after the LF refining lower electrode striking success, add earlier the calcium aluminium ball of 2.0～4.0Kg/t steel in molten steel, behind refining 1～2min, add the lime slag charge again in molten steel after adding, add-on is controlled at 6～10.0Kg/t steel; Treat that then refining 1～5min the inside in ladle adds the auxiliary material that contains Al2O3 of 1.0～3.0Kg/t steel, with further raising slag speed.
After the LF refining lower electrode striking success, add earlier the calcium aluminium ball of 2.5～3.0Kg/t steel in molten steel, behind refining 1～2min, add the lime slag charge again in molten steel after adding, add-on is controlled at 6～10.0Kg/t steel; When treating the refining 2min left and right sides then in ladle the inside add the auxiliary material that contains Al2O3 of 1.5～2.0Kg/t steel, with further raising slag speed.
After adding, and after the lime adding, add reductor again and carry out deoxidation in molten steel, add-on adds according to each 20Kg; Lasting number of times is controlled at 3～5 times; After treating that white slag is shaped, according to adding reductor every 3min in ladle, add-on adds according to 10Kg/ time, keeps white slag to guarantee whole refining process in two heating and follow-up heat-processed.
Above-mentioned calcium aluminium ball is that Xixia Longcheng Metallurgical Material Co., Ltd. produces and sells.
Above-mentioned slag charge composition exists to guarantee the final slag Composition Control: CaO content 55～60%, Al2O3 content 35～40%, SiO2 content＜8%, TFe content≤0.5% are as the criterion.
Enforcement recited above only is that the preferred embodiment for the present invention is described; be not that design of the present invention and scope are limited; under the prerequisite that does not break away from design philosophy of the present invention; various distortion and improvement that those skilled in the art make technical solution of the present invention all should belong to protection scope of the present invention.
Claims (1)
1. a novel LF refining furnace is made the method for white slag, it is characterized in that this method is: after the LF refining lower electrode striking success, the calcium aluminium ball that in molten steel, adds earlier 2.0～4.0Kg/t steel, after adding back refining 1～2min, add the lime slag charge in molten steel again, add-on is controlled at the steel at 6～10.0Kg/t; Treat that then refining 1～5min the inside in ladle adds the auxiliary material that contains Al2O3 of 1.0～3.0Kg/t steel, with further raising slag speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105976731A CN102041357A (en) | 2010-12-21 | 2010-12-21 | Novel method for making white slag with LF (ladle furnace) refining furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105976731A CN102041357A (en) | 2010-12-21 | 2010-12-21 | Novel method for making white slag with LF (ladle furnace) refining furnace |
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| CN102041357A true CN102041357A (en) | 2011-05-04 |
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| CN2010105976731A Pending CN102041357A (en) | 2010-12-21 | 2010-12-21 | Novel method for making white slag with LF (ladle furnace) refining furnace |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109680124A (en) * | 2019-01-21 | 2019-04-26 | 浙江英洛华装备制造有限公司 | A method of improving engineering machinery wear resistance castings performance |
| CN110157857A (en) * | 2019-06-03 | 2019-08-23 | 无锡市前洲无缝钢管有限公司 | A kind of manufacturing method of the high pressure resistant seamless steel pipe of petroleum |
| CN113930586A (en) * | 2021-09-23 | 2022-01-14 | 南京钢铁股份有限公司 | Method for producing white slag in bearing steel LF refining process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101314803A (en) * | 2008-04-23 | 2008-12-03 | 谢华 | Calloy deoxidizing agent for steel-smelting |
| CN101812568A (en) * | 2010-04-28 | 2010-08-25 | 河南省西保冶材集团有限公司 | Kalzium metal for deoxidization during steel making |
-
2010
- 2010-12-21 CN CN2010105976731A patent/CN102041357A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101314803A (en) * | 2008-04-23 | 2008-12-03 | 谢华 | Calloy deoxidizing agent for steel-smelting |
| CN101812568A (en) * | 2010-04-28 | 2010-08-25 | 河南省西保冶材集团有限公司 | Kalzium metal for deoxidization during steel making |
Non-Patent Citations (2)
| Title |
|---|
| 《冶金丛刊》 20030430 林伟 炉外精炼的碱性白渣应用及开发 , 第2期 * |
| 《炼钢》 20100630 王新志 等 LF快速造白渣工艺分析 第26卷, 第3期 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109680124A (en) * | 2019-01-21 | 2019-04-26 | 浙江英洛华装备制造有限公司 | A method of improving engineering machinery wear resistance castings performance |
| CN110157857A (en) * | 2019-06-03 | 2019-08-23 | 无锡市前洲无缝钢管有限公司 | A kind of manufacturing method of the high pressure resistant seamless steel pipe of petroleum |
| CN113930586A (en) * | 2021-09-23 | 2022-01-14 | 南京钢铁股份有限公司 | Method for producing white slag in bearing steel LF refining process |
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Application publication date: 20110504 |