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A kind of steel slag aluminothermic reduction method for producing ferroalloy and refining slag

A ferroalloy and refining slag technology, applied in the field of comprehensive utilization of metallurgical slag, can solve the problems of low added value of products and low recovery rate of steel slag resources, and achieve the effects of high added value of products, high resource utilization efficiency, and simple operation

Active Publication Date: 2019-08-23
临沂市钢铁产业协同创新中心 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a method for the production of ferroalloy and refining slag by aluminothermic reduction of steel slag. By introducing aluminum element into steel slag, the problems of low recovery rate of steel slag resources and low added value of products are solved. Efficient utilization of heat and comprehensive recycling of iron, phosphorus, manganese, silicon and slag in steel slag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042]The mass percentages of the main chemical components of liquid steel slag are: MFe 4.38%, FeO 15.46%, Fe 2 o 3 9.65%, SiO 2 10.63%, CaO 46.95%, MgO 4.96%, Al 2 o 3 3.64%, MnO 2.48%, P 2 o 5 1.85%. .

[0043] The process steps are as follows: put 100kg of liquid steel slag and 7.8kg of metallic aluminum into the first reactor, that is, the steel slag ladle, and carry out preliminary reduction by electromagnetic stirring for 10 minutes to prepare phosphorus-containing molten iron. The phosphorus-containing molten iron settles at the bottom of the steel slag ladle, and the molten iron The upper layer is slag; after the initial reduction is completed, pour the upper layer of slag into the second reactor, that is, the steel slag ladle, add 7kg of metal aluminum and carry out the second step of reduction by electromagnetic stirring for 10 minutes to prepare silicon-manganese alloy, and the obtained silicon-manganese alloy It settles to the bottom of the ladle, and the...

Embodiment 2

[0046] The mass percentages of the main chemical components of liquid steel slag are: MFe 3.45%, FeO 11.51%, Fe 2 o 3 17.90%, SiO 2 13.08%, CaO 42.50%, MgO 4.38%, Al 2 o 3 4.66%, MnO 1.29%, P 2 o 5 1.23%.

[0047] The process steps are as follows: put 100kg of liquid steel slag and 9.7kg of metallic aluminum into the first reactor, that is, the molten iron ladle, and carry out preliminary reduction by mechanical stirring for 60 minutes to prepare phosphorus-containing molten iron. The phosphorus-containing molten iron settles at the bottom of the ladle, and the molten iron The upper layer is molten slag; after the initial reduction is completed, the molten slag is poured into the second reactor, that is, the ladle, and 8.2kg of metallic aluminum is added to carry out the second step of reduction by electromagnetic stirring for 40 minutes to prepare silicon-manganese alloy, and the obtained silicon-manganese alloy It settles to the bottom of the ladle, and the slag is o...

Embodiment 3

[0050] The mass percentages of the main chemical components of liquid steel slag are: MFe 1.34%, FeO 12.86%, Fe 2 o 3 13.18%, SiO 2 11.11%, CaO 44.33%, MgO 7.82%, Al 2 o 3 4.54%, MnO 2.67%, P 2 o 5 2.15%.

[0051] The process steps are as follows: put 100kg of liquid steel slag and 8.8kg of metallic aluminum into the first reactor, that is, the ladle, and conduct preliminary reduction by electromagnetic stirring for 60 minutes to prepare phosphorus-containing molten iron, which settles at the bottom of the ladle. The upper layer of molten iron is molten slag; after the initial reduction is completed, the molten slag is poured into the second reactor, that is, the steel slag ladle, and 7.3kg of metal aluminum is added to carry out the second step of reduction by electromagnetic stirring for 60 minutes to prepare silicon-manganese alloy, and the obtained silicon-manganese The alloy settles to the bottom of the steel slag ladle, and the slag is on the upper layer; the upp...

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Abstract

The invention discloses a method for producing an iron alloy and refining slag through steel slag aluminothermic reduction. Liquid state steel slag and metallic aluminum are contained into a first reactor according to a certain mass ratio to be stirred to obtain phosphorus containing pig iron, the remaining liquid state steel slag and metallic aluminum obtained after reacting are contained into a second reactor according to a certain mass ratio to be stirred to obtain silicomanganese, and molten slag obtained after reacting in the second step serves as the steel-making refining slag. The obtained phosphorus containing pig iron and silicomanganese can be used for producing special steel, and the refining slag can be used for producing clean steel. The method has the beneficial effects that aluminum simple substance is led into the steel slag, the problems that the steel slag resource recovery rate is low, and the added value of products is low are solved, and meanwhile, efficient utilization of liquid state steel slag sensible heat and comprehensive recycling of iron, phosphorus, manganese, silicon and molten slag in the steel slag are achieved.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of metallurgical slag, and in particular provides a method for producing ferroalloy and refining slag through aluminothermic reduction of steel slag. Background technique [0002] Steel slag is the solid waste slag produced during oxygen blowing and dephosphorization in converters. Iron and steel enterprises produce about 120-150kg of steel slag per 1 ton of steel produced on average. The main components of steel slag are CaO, SiO 2 And MgO, also contains a certain amount of metallic iron and iron oxide. Steel slag has a high alkalinity and contains a certain amount of free CaO. It could have been used as a sintering ingredient. However, since the phosphorus content in steel slag is generally 1% to 4%, returning to sintering will increase the phosphorus load of the charge, resulting in phosphorus in molten iron. Exceeding the standard limits the return of steel slag to the ironmaking pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B15/02C21B3/06C21C7/076
CPCC21B3/06C21B15/02C21C7/076Y02P10/20Y02W30/50
Inventor 高建军万新宇王锋王海风郭玉华齐渊洪严定鎏
Owner 临沂市钢铁产业协同创新中心
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