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Method for utilizing vanadium in steel slag

A technology for steel slag and vanadium oxide, applied in the field of metallurgy, can solve the problems of low vanadium content, difficult recovery and utilization of vanadium, adverse environmental impact, etc., and achieve the effect of increasing the amount of tapping slag and meeting the needs of the smelting process.

Active Publication Date: 2015-05-13
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Vanadium-containing steel slag is an important and valuable metallurgical secondary resource, which can be used to extract V 2 o 5 However, due to its high calcium and iron content and low vanadium content, the existence state of vanadium is complex and dispersed in various mineral phases, making it difficult to recycle vanadium in it. Currently, vanadium in vanadium-containing steel slag cannot be reused as a resource , stacked in the open air, causing adverse effects on the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Smelting SS400 converter slag thickness 350mm, after entering the refining LF furnace, add lime 4kg / t steel, fluorite 1.2kg / t steel, add reducing agent 1.8kg / t steel, reducing agent is ferrosilicon powder 0.5kg / t Steel, silicon carbide 0.5kg / t steel, aluminum powder 0.8kg / t steel; CaO / SiO in steel slag 2 5, reduce phosphorus return, and use LF furnace electrode to supplement heat for 12 minutes at a temperature of 1590°C. After heating, adjust the argon flow rate to 1200nL / min for 3 minutes to increase the steel slag interface reaction and promote the reduction reaction. After the reaction, it was detected that the oxide of vanadium in the slag was 0.029%, the vanadium in molten steel was 0.010%, and the rephosphorus was 0.002%.

Embodiment 2

[0038] Smelting SS400 converter slag thickness 400mm, after entering the refining LF furnace, add lime 4.5kg / t steel, fluorite 1.5kg / t steel, add reducing agent 1.7kg / t steel, reducing agent is silicon carbide 0.8kg / t Steel, aluminum powder 0.9kg / t steel; CaO / SiO in steel slag 2 6, reduce phosphorus return, and use LF furnace electrode to supplement heat for 13 minutes at a temperature of 1620 ° C. After heating, adjust the argon flow rate to 1300nL / min for 5 minutes to increase the steel slag interface reaction and promote the reduction reaction. After the reaction, it was detected that the oxide of vanadium in the slag was 0.027%, the vanadium in molten steel was 0.012%, and the rephosphorus was 0.003%.

Embodiment 3

[0040] Smelting SS400 converter slag thickness 450mm, after entering the refining LF furnace, add lime 5.0kg / t steel, fluorite 1.8kg / t steel, add reducing agent 1.8kg / t steel, reducing agent is silicon carbide 0.9kg / t Steel, aluminum powder 0.9kg / t steel; CaO / SiO in steel slag 2 8, reduce phosphorus return, and use LF furnace electrode to supplement heat for 13 minutes at a temperature of -1600°C. After heating, adjust the argon flow rate to 1200nL / min for 4 minutes to increase the steel slag interface reaction and promote the reduction reaction. After the reaction, it was detected that the oxide of vanadium in the slag was 0.028%, the vanadium in molten steel was 0.014%, and the rephosphorus was 0.003%.

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Abstract

The invention relates to a method for utilizing vanadium in steel slag, and belongs to the technical field of metallurgy. The specific process is as follows: conveying steel slag of generated by steel discharge of a converter into a refining LF furnace, adding lime and fluorite, and adding a reducing agent to reduce vanadium oxide in the slag; meanwhile, using an LF furnace electrode to supplement heat, and adjusting argon flow to increase the interfacial reaction of the steel slag after heating, to promote the reduction reaction. During steel discharge of the converter, the discharge quantity of the steel slag is increased, the refining LF furnace is used for reducing the vanadium oxide in the steel slag, the vanadium oxide in the steel slag is reduced to be lower than 0.03%, the vanadium recovery rate in molten steel is 0.008-0.015%, the recycled phosphor is not larger than 0.003%, vanadium is used for alloying steel to achieve the purpose of resource recovery, the requirements of a smelting process can be satisfied, and an obvious effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for utilizing vanadium in steel slag. Background technique [0002] Chengde area is rich in reserves of vanadium-titanium magnetite, which is a world-class vanadium-titanium magnetite base. At present, China and most countries in the world use indirect methods to extract vanadium, that is, first smelting the ore into molten iron, and then using a converter to oxidize and blow The vanadium-containing slag is smelted as the raw material for vanadium extraction. After vanadium extraction, the semi-steel (that is, the molten iron after vanadium extraction) still contains relatively high residual vanadium. In addition, the processing capacity of individual processes in the vanadium-containing molten iron process is limited. The molten iron is directly blended into the steelmaking converter without vanadium extraction. During this process, a considerable amount of residual ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/076C21C5/28
CPCY02P10/20
Inventor 魏跃军张俊粉李凤臣王琪陈超高玲玲
Owner HEBEI IRON AND STEEL
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