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Method for simultaneously removing sulfur and phosphorus from semi-steel

A dephosphorization and halving technology, applied in the field of semi-steel smelting after vanadium extraction, can solve the problems of increasing the sodium content of vanadium slag, unfavorable production of vanadium products, affecting the life of converters, etc., so as to reduce the sodium content, prolong the process time, and reduce consumption. Effect

Active Publication Date: 2014-01-29
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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AI Technical Summary

Problems solved by technology

[0006] However, the methods in the above two patent documents all use sodium compounds as dephosphorization agents and carry out dephosphorization in the vanadium extraction converter. Although this can achieve a certain dephosphorization effect, the addition of sodium compounds into the converter The furnace lining is eroded greatly, which affects the life of the converter, and at the same time increases the sodium content in the vanadium slag, which is unfavorable for the subsequent production of vanadium products

Method used

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Examples

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Effect test

example 1

[0021] Passivated lime, iron oxide powder, and sodium oxide are used as raw materials to produce blowing aids, of which 65% of passivated lime, 15% of iron oxide, and 20% of sodium oxide. Before desulfurization, put the blowing aid powder and passivated magnesium powder into different material tanks, and the material tanks are sealed with dry nitrogen.

[0022] After the vanadium extraction in the converter is completed, the non-desulfurized semi-steel obtained after the vanadium extraction converter treatment is transported to the desulfurization station. Among them, the C content of semi-steel is 3.61%, the P content is 0.068%, and the S content is 0.065%.

[0023] When the desulfurization spray gun is lowered to 50cm of the half-steel liquid level, nitrogen is used as the carrier to spray the blowing aid powder, the spray speed is 42kg / min, and the spray is 0.5min. Then, desulfurization and dephosphorization are carried out by simultaneously spraying the blowing aid powder...

example 2

[0026] Passivated lime, iron oxide powder, and sodium oxide are used as raw materials to produce blowing aids, of which 65% of passivated lime, 5% of iron oxide, and 30% of sodium oxide. Before desulfurization, put the blowing aid powder and passivated magnesium powder into different material tanks, and the material tanks are sealed with dry nitrogen.

[0027] After the vanadium extraction in the converter is completed, the non-desulfurized semi-steel obtained after the vanadium extraction converter treatment is transported to the desulfurization station. Among them, the C content of semi-steel is 3.84%, the P content is 0.070%, and the S content is 0.54%.

[0028] When the desulfurization spray gun is lowered to 100cm of the half-steel liquid level, nitrogen is used as the carrier to spray the blowing aid powder, the spray speed is 39kg / min, and the spray is 1min. Then, desulfurization and dephosphorization are carried out by spraying the blowing aid powder and passivated ma...

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Abstract

The invention provides a method for simultaneously removing sulfur and phosphorus from semi-steel. The method comprises the following steps sequentially carried out on a semi-steel sulfur removal station: carrying out first-stage injection on the semi-steel by using a sulfur removal oxygen lance, wherein an injection material is injection-assisted powder taking an inert gas as a carrier; carrying out second-stage injection on the semi-steel by using the sulfur removal oxygen lance, wherein an injection material is a mixture of the injection-assisted powder taking the inert gas as the carrier and passivating magnesium powder; carrying out third-stage injection on the semi-steel by using the sulfur removal oxygen lance, wherein the injection material is the injection-assisted powder taking the inert gas as the carrier, the semi-steel is molten iron obtained after vanadium is extracted from vanadium-containing molten iron by using a converter, and the injection-assisted powder is prepared from 55-80 parts by weight of passivating lime, 5-15 parts by weight of ferric oxide and 20-30 parts by weight of sodium oxide. The method has the advantages that the semi-steel without the vanadium can be simultaneously subjected to pretreating sulfur and phosphorus removal; the corrosion on a lining of a vanadium extracting converter can be avoided, and meanwhile, the content of sodium in vanadium residues can be reduced.

Description

technical field [0001] The invention belongs to the technical field of semi-steel smelting after vanadium extraction, and specifically relates to a method for simultaneously desulfurizing and dephosphorizing semi-steel obtained after vanadium-containing molten iron is treated after vanadium extraction. Background technique [0002] Generally, phosphorus and sulfur are harmful elements in most steel types. In recent years, with the rapid development of science and technology, low-temperature steel, marine steel, hydrogen-induced cracking-resistant steel and steel for some thick plates require both extremely low sulfur content and phosphorus content in steel <0.01% or 0.005 %. As we all know, the sulfur content directly affects the performance of steel. Excessive sulfur content in steel will lead to deterioration of the hot workability of steel, resulting in "hot embrittlement" of steel; cracks; the plasticity of steel also significantly deteriorates with the increase of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064
Inventor 陈炼陈永戈文荪王建曾建华蒋龙奎李龙杨森祥卓钧董克平
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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