Recycling method of refining hot slag

A technology for hot slag and white slag, which is applied in the field of recycling of refining hot slag, can solve the problems of low comprehensive utilization rate of LF refining slag, waste of resources, environmental pollution, etc., so as to shorten the slag formation time, facilitate desulfurization, and reduce production costs. Effect

Inactive Publication Date: 2018-03-30
WUHU XINXING DUCTILE IRON PIPES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for recycling hot refining slag, which solves the problems that the recycling technology of LF refining slag is not mature at the present stage, and the comprehensive utilization rate of LF refining slag is low, causing serious environmental pollution and waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The molten steel refined by LF white slag is poured, and the poured hot steel slag and poured molten steel produced after LF white slag are poured into the empty ladle; the next round of molten steel to be refined, poured molten steel, 40 weight % poured waste hot steel slag and lime are added to the LF refining furnace for the next round of LF white slag refining; in LF white slag refining, the refining cycle is 40 minutes, and the white slag retention time is 20 minutes. When the molten steel is supplemented with aluminum, the steel Als / Alt in water = 90%, after adding aluminum to the molten steel, feed the calcium line to the molten steel (the speed of the calcium feeding line is 0.5m / s, the depth of the calcium feeding line is 10cm, and the holding time of the calcium feeding line is 18min ) and carry out soft blowing (in the process of soft blowing, a covering agent needs to be added, and the covering agent at least includes the following raw materials in weight per...

Embodiment 2

[0027] The molten steel refined by LF white slag is poured, and the poured hot steel slag and poured molten steel produced after LF white slag are poured into the empty ladle; the next round of molten steel to be refined, poured molten steel, 50 weight % poured waste hot steel slag and lime are added to the LF refining furnace for the next round of LF white slag refining; in LF white slag refining, the refining cycle is 40 minutes, and the white slag retention time is 20 minutes. When the molten steel is supplemented with aluminum, the steel Als / Alt in water = 92%, after adding aluminum to the molten steel, feed the calcium line to the molten steel (the speed of the calcium feeding line is 2.5m / s, the depth of the calcium feeding line is 50cm, and the holding time of the calcium feeding line is 20min ) and carry out soft blowing (in the process of soft blowing, a covering agent needs to be added, and the covering agent at least includes the following raw materials in weight per...

Embodiment 3

[0029] The molten steel refined by LF white slag is poured, and the poured hot steel slag and poured molten steel produced after LF white slag are poured into the empty ladle; the next round of molten steel to be refined, poured molten steel, 45 weight % poured waste hot steel slag and lime are added to the LF refining furnace for the next round of LF white slag refining; in the LF white slag refining, the refining cycle is 50 minutes, and the white slag retention time is 30 minutes. When the molten steel is supplemented with aluminum, the steel Als / Alt in water=95%, after adding aluminum to the molten steel, feed the calcium line to the molten steel (the speed of the calcium feeding line is 2.5m / s, the depth of the calcium feeding line is 50cm, and the holding time of the calcium feeding line is 25min ) and carry out soft blowing (in the process of soft blowing, a covering agent needs to be added, and the covering agent at least includes the following raw materials in weight p...

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PUM

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Abstract

The invention discloses a recycling method of refining hot slag. The recycling method of the refining hot slag comprises the steps that molten steel subjected to LF white slag refining is cast, casting residual hot steel-making slag and casting residual molten steel generated after LF white slag refining are poured into an empty steel ladle, and to-be-refined molten steel, casting residual moltensteel, casting residual hot steel-making slag with the weight being 40-50% and lime of the next cycle are added into an LF refining furnace for LF white slag refining of the next cycle. By means of the recycling method of the refining hot slag, the problems that an LF refining slag cycling technology of the present stage is not mature yet, the LF refining slag comprehensive utilization rate is low, and severe environment pollution and resource waste are caused are solved.

Description

technical field [0001] The invention relates to the field of steelmaking, in particular to a method for recycling hot refining slag. Background technique [0002] With the increasing steel production in my country and the wide application of LF refining equipment, the production of LF refining slag is also increasing. At this stage, my country produces about 12 million tons of LF refining waste slag every year. Due to the recycling technology of LF refining slag in my country It is still immature, and the comprehensive utilization rate of LF refining slag at this stage is low, causing serious environmental pollution and waste of resources. At the same time, in the recycling of LF refining slag, the size of Ds-type (≥13 μm) inclusions exceeds the standard in molten steel. Contents of the invention [0003] The purpose of the present invention is to provide a method for recycling hot refining slag, which solves the problems of immature recycling technology of LF refining sla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/076C21C7/00
CPCC21C7/0006C21C7/0056C21C7/076Y02P10/20
Inventor 李海张洪彪解华振介瑞华陆曼范石伟
Owner WUHU XINXING DUCTILE IRON PIPES
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