CN110551874A - smelting method for improving vacuum aluminum recovery rate - Google Patents

smelting method for improving vacuum aluminum recovery rate Download PDF

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Publication number
CN110551874A
CN110551874A CN201910881547.XA CN201910881547A CN110551874A CN 110551874 A CN110551874 A CN 110551874A CN 201910881547 A CN201910881547 A CN 201910881547A CN 110551874 A CN110551874 A CN 110551874A
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CN
China
Prior art keywords
vacuum
slag
recovery rate
aluminum
smelting
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910881547.XA
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Chinese (zh)
Inventor
邓建军
李建朝
李样兵
李�杰
赵国昌
袁锦程
吴艳阳
龙杰
柳付芳
牛红星
尹卫江
侯敬超
王东阳
顾自有
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Wuyang Iron and Steel Co Ltd
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Wuyang Iron and Steel Co Ltd
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Publication date
Application filed by Wuyang Iron and Steel Co Ltd filed Critical Wuyang Iron and Steel Co Ltd
Priority to CN201910881547.XA priority Critical patent/CN110551874A/en
Publication of CN110551874A publication Critical patent/CN110551874A/en
Pending legal-status Critical Current

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Classifications

    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04Removing impurities by adding a treating agent
    • C21C7/072Treatment with gases
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04Removing impurities by adding a treating agent
    • C21C7/076Use of slags or fluxes as treating agents
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10Handling in a vacuum
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

the invention discloses a smelting method for improving the recovery rate of vacuum aluminum, which belongs to the technical field of ferrous metallurgy and comprises a vacuum VD process, wherein the vacuum VD process comprises the steps of controlling the total amount of vacuum slag to 5-8 kg/ton steel, controlling the thickness of a slag layer to 155-165mm, reducing the content of SiO 2 in slag to 10-12%, filling 320-350kg/h of nitrogen in the vacuum destruction process to prevent air from entering, and simultaneously adjusting the flow of argon to 30.5-32NL/min to ensure that the slag layer is not blown away.

Description

Smelting method for improving vacuum aluminum recovery rate
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a smelting method for improving the recovery rate of vacuum aluminum.
Background
For the fine grain killed steel which uses Al element as final deoxidation, the technical requirement has definite specification on the aluminum content. For example, the Al element in the chromium-molybdenum steel reaches 0.018-0.050%, and the steel is generally considered to meet the requirement of fine-grain killed steel. However, from the statistical results of steel works in China at present, Al deoxidized fine-grained killed steel which needs vacuum treatment, and aluminum wires which are fed into molten steel before VD vacuum treatment have the aluminum alloy recovery rate of only 20% -45% due to the influence of air, slag quantity, slag layer thickness, slag components and the like. Even after certain measures or methods are adopted, the recovery rate is only close to 50 percent, the recovery rate is not obviously improved, a large amount of Al alloy is wastefully consumed, and the smelting period is inevitably prolonged. In some steel mills, the aluminum recovery rate is maintained in vacuum, and even a large amount of aluminum wires are fed after the vacuum is finished, so that the product is not scrapped due to excessive flaw detection of aluminum inclusions, and the loss is huge. Therefore, on the basis of not influencing the final quality of molten steel, the practical improvement of the vacuum aluminum recovery rate becomes one of the main problems which are urgently needed to be solved by steel mills at present.
Disclosure of Invention
The invention aims to provide a smelting method for improving the recovery rate of vacuum aluminum, and particularly relates to a steelmaking method capable of improving the recovery rate of vacuum aluminum alloy and reducing smelting cost and smelting period.
In order to solve the technical problems, the invention adopts the technical scheme that:
A smelting method for improving the recovery rate of vacuum aluminum comprises a vacuum VD process, wherein the vacuum VD process comprises the steps of controlling the total amount of vacuum slag, the thickness of a slag layer, reducing the content of SiO 2 in slag, filling nitrogen in the vacuum destruction process and adjusting the flow of argon.
Preferably, in the vacuum VD step, the total vacuum slag amount is controlled to be 5-8 kg/ton steel, the thickness of a slag layer is controlled to be 155-165mm, steel slag reaction is facilitated, secondary oxidation of the molten steel and consumption of aluminum oxygen reaction are prevented, the molten steel is ensured to be fully stirred, and slag overflow and steel overflow are prevented.
Preferably, in the vacuum VD process, the content of SiO 2 in the slag is controlled to 10-12%, and the content of SiO 2 in the slag is reduced by controlling the slag components, so that the alkalinity of the slag is improved, and the consumption of the chemical reaction of aluminum and SiO 2 is finally reduced.
Preferably, in the vacuum VD procedure, the vacuum destruction process is filled with 320-350kg/h of nitrogen, so as to prevent air from entering, and simultaneously, the flow of argon is adjusted to 30.5-32NL/min, so as to ensure that the slag layer is not blown away.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
1. In the traditional vacuum treatment process, if the slag amount and the slag layer thickness are not controlled well, a part of fed aluminum is oxidized and consumed, and is wasted, aluminum entering molten steel is greatly influenced by slag components, the low alkalinity in slag can promote the reaction of Al and SiO 2, so that the loss of Al alloy is increased, and when the air is filled in the slag layer or the argon flow is improperly controlled in the vacuum destruction process, the oxygen absorption of the slag layer is even caused, so that the secondary oxidation of the molten steel is further promoted, so that the loss of the Al alloy is further intensified;
2. The recovery rate of the aluminum in the vacuum process is improved to 70-75% from the original 20-45%, the recovery rate of the aluminum in the vacuum process is greatly improved, the purpose of reducing the consumption cost of the aluminum alloy is realized, and the method has wide application value.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
The molten steel amount is 90t, the VOD ladle is vacuumized, a molten steel sample is taken to test the Al element content by 0.070 percent before the vacuumizing is started, the total vacuum slag amount is controlled to 450kg, the thickness of a slag layer is controlled to 155mm, the SiO 2 content in slag is controlled to 10 percent, the vacuum destruction process is filled with nitrogen by 320kg/h to prevent air from entering, the argon flow is adjusted to 30.5NL/min at the same time to ensure that the slag layer is not blown away, the molten steel sample is taken to test the Al element content by 0.049 percent after the vacuum treatment is finished, and the aluminum recovery rate in the vacuum process is 70 percent through calculation.
Example 2
The molten steel amount is 100t, the VOD ladle is vacuumized, the Al element content of a sampled molten steel is tested to be 0.075 percent before pumping, the total vacuum slag amount is controlled to be 650kg, the thickness of a slag layer is controlled to be 160mm, the SiO 2 content in slag is controlled to be 11 percent, nitrogen is filled for 335kg/h in the vacuum destruction process to prevent air from entering, the argon flow is adjusted to be 31NL/min at the same time to ensure that the slag layer is not blown away, the Al element content of the sampled molten steel is tested to be 0.054 percent after the vacuum treatment is finished, and the aluminum recovery rate in the vacuum process is 72 percent through calculation.
Example 3
The molten steel amount is 120t, the VOD ladle is vacuumized, a molten steel sample is taken to test the Al element content to be 0.080% before the vacuumizing is started, the total vacuum slag amount is controlled to be 960kg, the thickness of a slag layer is controlled to be 165mm, the SiO 2 content in slag is controlled to be 12%, nitrogen is filled for 350kg/h in the vacuum breaking process to prevent air from entering, meanwhile, the argon flow is adjusted to be 32NL/min to ensure that the slag layer is not blown away, the molten steel sample is taken to test the Al element content to be 0.060% after the vacuum treatment is finished, and the aluminum recovery rate is 75% in the vacuum process through calculation.
Example 4
The molten steel amount is 95t, the VOD ladle is vacuumized, a molten steel sample is taken before the vacuumizing, the Al element content is tested to be 0.073%, the total vacuum slag amount is controlled to be 480kg, the slag layer thickness is controlled to be 156mm, and the SiO2 content in the slag is controlled to be 10.5%; the vacuum breaking process is filled with 330kg/h of nitrogen to prevent air from entering, and meanwhile, the flow of argon is adjusted to 31NL/min to ensure that a slag layer is not blown away. And after the vacuum treatment is finished, taking a molten steel sample to test the content of the Al element to be 0.054%. The calculated aluminum recovery rate in the vacuum process was 73.9%.
Example 5
The molten steel amount is 105t, the VOD ladle is vacuumized, a molten steel sample is taken before the vacuumizing, the Al element content is tested to be 0.077%, the total vacuum slag amount is controlled to be 735kg, the slag layer thickness is controlled to be 163mm, and the SiO2 content in the slag is controlled to be 11.5%; the vacuum breaking process is filled with 340kg/h of nitrogen to prevent air from entering, and meanwhile, the flow of argon is adjusted to 31.5NL/min to ensure that a slag layer is not blown away. And after the vacuum treatment is finished, taking a molten steel sample to test the content of the Al element to be 0.057 percent. The calculated aluminum recovery in the vacuum process was 74%.
Example 6
The molten steel amount is 110t, the VOD ladle is vacuumized, a molten steel sample is taken before the vacuumizing, the Al element content is tested to be 0.079%, the total vacuum slag amount is controlled to be 860kg, the slag layer thickness is controlled to be 164mm, and the SiO2 content in the slag is controlled to be 12%; the vacuum breaking process is filled with 348kg/h of nitrogen to prevent air from entering, and meanwhile, the flow of argon is adjusted to 31.9NL/min to ensure that a slag layer is not blown away. And after the vacuum treatment is finished, taking a molten steel sample to test the content of the Al element to be 0.059%. The calculated aluminum recovery in the vacuum process was 74.7%.
Al which is smelted by the traditional process is deoxidized and treated in vacuum to calm the steel, and the recovery rate of vacuum aluminum is 50 percent at most; after the production process is adopted, the vacuum aluminum recovery rate is up to 70-75%, and the aluminum consumption in the vacuum process is greatly reduced.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.

Claims (4)

1. A smelting method for improving the recovery rate of vacuum aluminum is characterized by comprising a vacuum VD process, wherein the vacuum VD process comprises the steps of controlling the total amount of vacuum slag, the thickness of a slag layer, reducing the content of SiO 2 in slag, filling nitrogen in the vacuum destruction process and adjusting the flow of argon.
2. The smelting method for improving the vacuum aluminum recovery rate according to claim 1, wherein the vacuum VD process is characterized in that the total vacuum slag amount is controlled to 5-8 kg/ton steel, and the slag layer thickness is controlled to 155-165 mm.
3. the smelting method for improving the vacuum aluminum recovery rate according to claim 1, wherein the vacuum VD process is used for controlling the content of SiO 2 in the slag to 10-12%.
4. The smelting method for improving the vacuum aluminum recovery rate as claimed in claim 1, wherein the vacuum VD process, the vacuum destruction process is performed by introducing nitrogen gas 320-350kg/h while adjusting the argon flow to 30.5-32 NL/min.
CN201910881547.XA 2019-09-18 2019-09-18 smelting method for improving vacuum aluminum recovery rate Pending CN110551874A (en)

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US4741772A (en) * 1984-05-08 1988-05-03 China Steel Corporation Si contained ferroalloy addition as a weak pre-deoxidation process in steelmaking
CN1556227A (en) * 2004-01-08 2004-12-22 太原钢铁(集团)有限公司 Vacuum oxygen blowing decarbon refining furnace smelting stainless steel high carbon region denitrogen method
CN101058837A (en) * 2007-05-30 2007-10-24 山西太钢不锈钢股份有限公司 Smelting method for decarburization and denitrogenation of ultra-pure ferrite stainless steel
CN101736122A (en) * 2010-01-12 2010-06-16 山西太钢不锈钢股份有限公司 Method for improving recovery rate of smelt nonmagnetic steel aluminum
CN104004881A (en) * 2014-06-13 2014-08-27 常州东大中天钢铁研究院有限公司 Method for controlling nitrogen content in process of producing aluminium deoxidation high-carbon steel
CN105177215A (en) * 2015-08-28 2015-12-23 常州东大中天钢铁研究院有限公司 Efficient production process of high aluminum-alloy-content structure round steel
CN106148844A (en) * 2016-08-12 2016-11-23 常州东大中天钢铁研究院有限公司 A kind of preparation method of sulfur-bearing ultralow titanium high standard bearing steel

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4741772A (en) * 1984-05-08 1988-05-03 China Steel Corporation Si contained ferroalloy addition as a weak pre-deoxidation process in steelmaking
CN1556227A (en) * 2004-01-08 2004-12-22 太原钢铁(集团)有限公司 Vacuum oxygen blowing decarbon refining furnace smelting stainless steel high carbon region denitrogen method
CN101058837A (en) * 2007-05-30 2007-10-24 山西太钢不锈钢股份有限公司 Smelting method for decarburization and denitrogenation of ultra-pure ferrite stainless steel
CN101736122A (en) * 2010-01-12 2010-06-16 山西太钢不锈钢股份有限公司 Method for improving recovery rate of smelt nonmagnetic steel aluminum
CN104004881A (en) * 2014-06-13 2014-08-27 常州东大中天钢铁研究院有限公司 Method for controlling nitrogen content in process of producing aluminium deoxidation high-carbon steel
CN105177215A (en) * 2015-08-28 2015-12-23 常州东大中天钢铁研究院有限公司 Efficient production process of high aluminum-alloy-content structure round steel
CN106148844A (en) * 2016-08-12 2016-11-23 常州东大中天钢铁研究院有限公司 A kind of preparation method of sulfur-bearing ultralow titanium high standard bearing steel

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