CN102828040A - Method for recycling metallic aluminium in pre-melted slag of vacuum circulation degassing furnace - Google Patents

Method for recycling metallic aluminium in pre-melted slag of vacuum circulation degassing furnace Download PDF

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Publication number
CN102828040A
CN102828040A CN2012103579229A CN201210357922A CN102828040A CN 102828040 A CN102828040 A CN 102828040A CN 2012103579229 A CN2012103579229 A CN 2012103579229A CN 201210357922 A CN201210357922 A CN 201210357922A CN 102828040 A CN102828040 A CN 102828040A
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molten steel
slag
aluminium
steel
metallic aluminium
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CN102828040B (en
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林洋
王晓峰
张钟铮
姚伟智
袁皓
马勇
吴春杰
臧绍双
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Angang Steel Co Ltd
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Angang Steel Co Ltd
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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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Abstract

The invention provides a method for recycling metallic aluminium in pre-melted slag of a vacuum circulation degassing furnace. Mass percent of Als in molten steel is controlled to be more than or equal to 0.005%; temperature of the molten steel in a steel ladle is controlled to be 1580-1650 DEG C; pressure of a vacuum chamber is controlled to be 40-67Pa, lift gas flow of an insert tube is controlled to be 70-150Nm<3>/h, depth of the insert tube which is immersed into the molten steel is controlled to be 400-600mm; and the pre-melted slag or bauxite is added into the molten steel in proportion of 1-8kg per ton of steel, a carburant is added into the molten steel in proportion of 0.1-0.4kg per ton of steel, and reduction-oxidation reaction of alumina and carbon under high vacuum degree in an RH furnace is utilized for reducing the metallic aluminium in alumina into the molten steel, thus the aim of recycling the metallic aluminium in the pre-melted slag is realized. Filed tests show that aluminium increase of the molten steel by adopting the recycling method disclosed by the invention is increased by more than 0.003-0.020%, consumption of aluminium can be greatly reduced, and treatment cost of the molten steel can be effectively reduced.

Description

The recovery method of metallic aluminium in a kind of vacuum degassing furnace pre-melted slag
Technical field
The invention belongs to the process for making field, particularly a kind of being used for is recovered to the method in the molten steel with the metallic aluminium of vacuum degassing furnace (RH stove) pre-melted slag.
Background technology
Vacuum circulation degassing method (RH method) is a kind of important molten steel furnace external refining method, has short, series of advantages such as throughput is big, refining effect good, easy operation of processing cycle, in STEELMAKING PRODUCTION, has obtained widespread use.Up to the present, the RH stove has been changed into by original single de-gassing vessel and has comprised vacuum decarburization, oxygen decarburization, dusts and added slag charge desulfurization, temperature compensation, uniform temperature and the multi-functional external refining device that becomes to grade.And, showing significant meliority aspect low-carbon (LC), the ultra low-carbon steel producing along with the expansion of development of technology and refining function, be the outer treatment unit of the important stove of modernized steel mill.
Molten steel needs to add metallic aluminium according to the steel grade requirement in the treating processes of RH stove usually, reaches the purpose of deoxidation and alloying.Because the metallic aluminium price is higher; And aluminium is a kind of strong reductor; Aluminum oxide is difficult to be reduced in the ordinary course of things, and the RH stove often uses the pre-melted slag that is rich in aluminum oxide to carry out desulfurization, and the pre-melted slag after the desulfurization all is discharged in the Vakuumkammer does not have utilization again in the ladle top slag; Thereby increased smelting cost; Therefore be necessary to the vacuum circulation degassing of RH stove and the metallurgical reaction environment of molten steel desulfurizing, develop an effective method that from pre-melted slag, reclaims metallic aluminium, to reduce the processing cost of RH stove refined molten steel.
Summary of the invention
The object of the present invention is to provide a kind of metallurgy condition that can make full use of the RH stove, the metallic aluminium in the pre-melted slag is recovered in the molten steel, thereby the consumption of minimizing aluminium effectively reduces production costs.
For this reason, the present invention has taked following solution:
The recovery method of metallic aluminium in a kind of vacuum degassing furnace pre-melted slag; Utilize the redox reaction of aluminum oxide and carbon under the RH stove condition of high vacuum degree; Aluminum oxide in the slag and the reaction of the carbon in the carburelant are generated metallic aluminium; The CO gas that is fused to the metallic aluminium generation in the molten steel is discharged to outside the RH stove through vacuum system, promotes further carrying out of reduction reaction; Utilize simultaneously that slag floats on the residence time above the molten steel in the reaction process in the RH stove; The strength of the strong molten steel of upwards gushing through the lift gas in the rising suction nozzle; For the aggravation reaction provides good dynamic conditions; Make and constantly impact fusion between molten steel, slag and the carburelant in the Vakuumkammer each other, liquid slag drip and carburelant between carry out comparatively strong reaction, the metallic aluminium in the aluminum oxide is reduced in the molten steel.Its concrete grammar is:
1, before the RH stove carries out the aluminium reclaimer operation, carries out the molten steel deep deoxidation with aluminium earlier, mass percent >=0.005% of Als in the control molten steel;
2, liquid steel temperature is controlled at 1580-1650 ℃ in the ladle;
3, RH stove Vakuumkammer vacuum pressure is controlled at 40-67Pa, and the lift gas flow of tubular stinger is 70-150Nm 3/ h, tubular stinger immerse the molten steel degree of depth and are controlled at 400-600mm;
4, the ratio according to steel 1-8kg per ton adds pre-melted slag or bauxitic clay in molten steel, and the ratio according to steel 0.1-0.4kg per ton adds carburelant in molten steel simultaneously.
Contain Al in the said pre-melted slag 2O 330-45wt% contains CaO 40-60 wt%.
Said carburelant contains C >=90 wt%.
Beneficial effect of the present invention is:
The present invention makes full use of aluminum oxide and the redox reaction of carbon and the low characteristics of partial pressure in the Vakuumkammer under the RH stove condition of high vacuum degree; The CO gas that the metallic aluminium that is fused in the molten steel is produced is discharged to outside the RH stove through vacuum system, promotes the carrying out of reduction reaction.And utilize that slag floats on the residence time above the molten steel in the reaction process in the RH stove; The strength of the strong molten steel of upwards gushing through the lift gas in the rising suction nozzle; For aggravation reaction provides good dynamic conditions, make and constantly impact fusion between molten steel, slag and the carburelant in the Vakuumkammer each other, liquid slag drip and carburelant between carry out comparatively strong reaction; Metallic aluminium in the aluminum oxide is reduced in the molten steel, has realized from pre-melted slag, reclaiming the purpose of metallic aluminium.Through actual measurement, the molten steel after the present invention reclaims increases the aluminium amount and improves more than the 0.003-0.020%, thereby can greatly reduce the consumption of aluminium, effectively reduces the processing cost of molten steel.
Embodiment
The present invention makes full use of the redox reaction of aluminium oxide and carbon under the RH stove condition of high vacuum degree; Aluminium oxide in the slag and the reaction of the carbon in the carburant are generated metallic aluminium; The CO gas that is fused to the metallic aluminium generation in the molten steel is discharged to outside the RH stove by vacuum system, promotes further carrying out of reduction reaction; Utilize simultaneously that slag floats on the holdup time above the molten steel in the course of reaction in the RH stove; The strength of the strong molten steel of upwards gushing by the lift gas in the rising suction nozzle; For the aggravation reaction provides good dynamic conditions; Make and constantly impact fusion between molten steel, slag and the carburant in the vacuum chamber each other; Liquid slag drip and carburant between carry out comparatively strong reaction; Thereby the metallic aluminium in the aluminium oxide is reduced in the molten steel, realizes from pre-melted slag, reclaiming the purpose of metallic aluminium.
Embodiment 1:
Adopt 180 tons of RH stoves.Pre-melted slag contains Al 2O 339.5wt%, CaO 46.1 wt%.Carburelant contains C95.4 wt%.
1, before the RH stove carries out the aluminium reclaimer operation, carry out the molten steel deep deoxidation with aluminium earlier, the mass percent of Als is 0.006% in the control molten steel.
2, liquid steel temperature is controlled at 1612 ℃ in the ladle.
3, RH stove Vakuumkammer vacuum pressure is controlled at 61Pa, and the lift gas flow of tubular stinger is 75Nm 3/ h, tubular stinger immerse the molten steel degree of depth and are controlled at 450mm.
4, behind the deoxidation of molten steel, in molten steel, add pre-melted slag 450 kg, add carburelant 28kg simultaneously.
After 3min fusing and reaction, mix slag and be rejected to outside the Vakuumkammer, through the circulation of 2min molten steel evenly, during do not add any alloy and aluminium.Sampling afterwards, the Als content of measuring in the steel has reached 0.011%.
Embodiment 2:
Adopt 180 tons of RH stoves.Pre-melted slag contains Al 2O 330wt%, CaO 58 wt%.Carburelant contains C93 wt%.
1, before the RH stove carries out the aluminium reclaimer operation, carry out the molten steel deep deoxidation with aluminium earlier, the mass percent of Als is 0.011% in the control molten steel.
2, liquid steel temperature is controlled at 1644 ℃ in the ladle.
3, RH stove Vakuumkammer vacuum pressure is controlled at 42Pa, and the lift gas flow of tubular stinger is 14Nm 3/ h, tubular stinger immerse the molten steel degree of depth and are controlled at 590mm.
4, behind the deoxidation of molten steel, in molten steel, add pre-melted slag 1420 kg, add carburelant 71kg simultaneously.
After 4min fusing and reaction, mix slag and be rejected to outside the Vakuumkammer, through the circulation of 2min molten steel evenly, during do not add any alloy and aluminium.Sampling afterwards, the Als content of measuring in the steel has reached 0.029%.
Embodiment 3:
Adopt 180 tons of RH stoves.Pre-melted slag contains Al 2O 345wt%, CaO 41 wt%.Carburelant contains C94.8wt%.
1, before the RH stove carries out the aluminium reclaimer operation, carry out the molten steel deep deoxidation with aluminium earlier, the mass percent of Als is 0.022% in the control molten steel.
2, liquid steel temperature is controlled at 1560 ℃ in the ladle.
3, RH stove Vakuumkammer vacuum pressure is controlled at 46Pa, and the lift gas flow of tubular stinger is 130Nm 3/ h, tubular stinger immerse the molten steel degree of depth and are controlled at 490mm.
4, behind the deoxidation of molten steel, in molten steel, add pre-melted slag 1100 kg, add carburelant 50kg simultaneously.
After 4min fusing and reaction, mix slag and be rejected to outside the Vakuumkammer, through the circulation of 2min molten steel evenly, during do not add any alloy and aluminium.Sampling afterwards, the Als content of measuring in the steel has reached 0.034%.
Embodiment 4:
Adopt 180 tons of RH stoves.Carburelant contains C96 wt%.
1, before the RH stove carries out the aluminium reclaimer operation, carry out the molten steel deep deoxidation with aluminium earlier, the mass percent of Als is 0.027% in the control molten steel.
2, liquid steel temperature is controlled at 1624 ℃ in the ladle.
3, RH stove Vakuumkammer vacuum pressure is controlled at 55Pa, and the lift gas flow of tubular stinger is 115Nm 3/ h, tubular stinger immerse the molten steel degree of depth and are controlled at 550mm.
4, behind the deoxidation of molten steel, in molten steel, add bauxitic clay 870 kg, add carburelant 39kg simultaneously.
After 3min fusing and reaction, mix slag and be rejected to outside the Vakuumkammer, through the circulation of 2min molten steel evenly, during do not add any alloy and aluminium.Sampling afterwards, the Als content of measuring in the steel has reached 0.036%.

Claims (3)

1. the recovery method of metallic aluminium in the vacuum degassing furnace pre-melted slag; It is characterized in that; Utilizing vacuum degassing furnace is the redox reaction of aluminum oxide and carbon under the RH stove condition of high vacuum degree; Aluminum oxide in the slag and the reaction of the carbon in the carburelant are generated metallic aluminium, and the CO gas that is fused to the metallic aluminium generation in the molten steel is discharged to outside the RH stove through vacuum system, promotes further carrying out of reduction reaction; Utilize simultaneously that slag floats on the residence time above the molten steel in the reaction process in the RH stove; The strength of the strong molten steel of upwards gushing through the lift gas in the rising suction nozzle; For the aggravation reaction provides good dynamic conditions; Make and constantly impact fusion between molten steel, slag and the carburelant in the Vakuumkammer each other, liquid slag drip and carburelant between carry out comparatively strong reaction, the metallic aluminium in the aluminum oxide is reduced in the molten steel; Its concrete grammar is:
(1), before the RH stove carries out the aluminium reclaimer operation, earlier carry out the molten steel deep deoxidation, mass percent >=0.005% of Als in the control molten steel with aluminium;
(2), liquid steel temperature is controlled at 1580-1650 ℃ in the ladle;
(3), RH stove Vakuumkammer vacuum pressure is controlled at 40-67Pa, the lift gas flow of tubular stinger is 70-150Nm 3/ h, tubular stinger immerse the molten steel degree of depth and are controlled at 400-600mm;
(4), in molten steel, add pre-melted slag or bauxitic clay, the ratio according to steel 0.1-0.4kg per ton adds carburelant in molten steel simultaneously according to the ratio of steel 1-8kg per ton.
2. the recovery method of metallic aluminium is characterized in that in the vacuum degassing furnace pre-melted slag according to claim 1, contains Al in the said pre-melted slag 2O 330-45wt% contains CaO 40-60 wt%.
3. the recovery method of metallic aluminium is characterized in that in the vacuum degassing furnace pre-melted slag according to claim 1, and said carburelant contains C >=90 wt%.
CN201210357922.9A 2012-09-25 2012-09-25 Method for recycling metallic aluminium in pre-melted slag of vacuum circulation degassing furnace Active CN102828040B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105950888A (en) * 2016-07-12 2016-09-21 中国重型机械研究院股份公司 Vacuum purification device and method for aluminum melt

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105950888A (en) * 2016-07-12 2016-09-21 中国重型机械研究院股份公司 Vacuum purification device and method for aluminum melt

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