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Method for treating high-silicon vanadium liquid iron for vanadium extracting through converter two-blowing, two-pouring and one-time slag discharging method

A converter and molten iron technology, applied in the field of metallurgy, can solve the problems of high residual vanadium in semi-steel, decreased quality and grade of vanadium slag, low slag production rate, etc., so as to reduce residual vanadium in semi-steel, improve the grade and quality of vanadium slag, and be easy to popularize and apply. Effect

Pending Publication Date: 2020-10-09
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of conventional converter vanadium extraction and steelmaking, the high content of silicon in molten iron will inhibit the oxidation of vanadium, and the vanadium slag (SiO 2 ) high content will cause problems such as thin slag state, lower quality and grade of vanadium slag, high residual vanadium in semi-steel, and low slag production rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for extracting vanadium from high-silicon medium-vanadium hot metal by two-blowing, two-pouring, and one-time slag removal in a converter, comprising the following steps:

[0025] A. Ratio of molten iron and scrap steel: Add molten iron and scrap steel to the LD converter, control the temperature of the molten iron to 1200°C, and adjust the ratio of scrap steel into the converter to 0%;

[0026] B. Oxygen supply for silicon removal and slag removal: during the 2.9 minutes before converter oxygen blowing smelting, the flow rate of oxygen supply is 6800m 3 / h, control the gun position to 1350mm for 2.4 minutes of oxygen blowing smelting, then lower the gun position to 400mm and continue blowing for the rest of the time, then lift the gun and pour out the initial high silicon slag;

[0027] C. Secondary oxygen supply for vanadium extraction: After pouring out the initial high-silicon slag, shake the converter, control the gun position to 900-1200mm, and control th...

Embodiment 2

[0031] A method for extracting vanadium from high-silicon medium-vanadium hot metal by two-blowing, two-pouring, and one-time slag removal in a converter, comprising the following steps:

[0032] A. Ratio of molten iron and scrap steel: Add molten iron and scrap steel to the LD converter, control the temperature of the molten iron to 1250°C, and adjust the ratio of scrap steel into the converter to 2%;

[0033] B. Oxygen supply to remove silicon and slag: during the 3.1 minutes before converter oxygen blowing smelting, the flow rate of oxygen supply is 7500m 3 / h, control the gun position to 1500mm for 2.6 minutes of oxygen blowing smelting, then lower the gun position to 500mm and continue blowing for the rest of the time, then lift the gun and pour out the initial high silicon slag;

[0034] C. Secondary oxygen supply for vanadium extraction: After pouring out the initial high-silicon slag, shake the converter, control the position of the gun at 900-1200mm, and control the f...

Embodiment 3

[0041] A method for extracting vanadium from high-silicon medium-vanadium hot metal by two-blowing, two-pouring, and one-time slag removal in a converter, comprising the following steps:

[0042] A. Ratio of molten iron and scrap steel: Add molten iron and scrap steel to the LD converter, control the temperature of the molten iron to 1220°C, and adjust the ratio of scrap steel into the converter to 7%;

[0043] B. Oxygen supply to remove silicon and slag: during the first 3 minutes of converter oxygen blowing smelting, the flow rate of oxygen supply is 7000m 3 / h, control the gun position to 1400mm for 2.5 minutes of oxygen blowing smelting, then lower the gun position to 450mm and continue blowing for the rest of the time, then lift the gun and pour out the initial high silicon slag;

[0044] C. Secondary oxygen supply for vanadium extraction: After pouring out the initial high-silicon slag, shake the converter, control the gun position to 900-1200mm, and control the oxygen f...

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PUM

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Abstract

The invention relates to a method for treating high-silicon vanadium liquid iron for vanadium extracting through a converter two-blowing, two-pouring and one-time slag discharging method and belongs to the technical field of smelting. The method includes the several steps of liquid iron scrap steel matching, primary oxygen supply, silicon removing and slag pouring, secondary oxygen supply and vanadium extracting, later-period temperature control and FeO reducing for vanadium slag grade maintaining, and slag discharging. The method has the beneficial effects that the high-silicon vanadium liquid iron is treated for vanadium extracting, half steel and residual vanadium are reduced, and the vanadium slag grade and quality are improved; and in the smelting process that the high-silicon liquidiron (>0.55 wt%[Si]) is used for a converter for vanadium extracting, the vanadium slag grade is improved to 10.1% from the average value of 7.8%, vanadium in the liquid iron is sufficiently recycled,the [SiO2] in the vanadium slag is controlled to be 9.91%-11.3%, and the method is easily applied and popularized.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for extracting vanadium from high-silicon medium vanadium hot metal by a converter two-blowing, two-pouring, and one-time slag removal method. Background technique [0002] Affected by the continuous rise in international iron ore prices, inland iron and steel enterprises have increased the use of poor miscellaneous ore in the surrounding areas. The resources of vanadium-titanium magnetite in the surrounding areas of Yunnan are rich, and the development of blast furnace vanadium-titanium magnetite smelting and vanadium extraction steelmaking has become a steel enterprise. best choice. When blast furnaces are smelted with vanadium-titanium magnetite, which is more difficult to smelt, due to the influence of ore structure, raw materials and fluctuations in furnace conditions, more than 5% of the molten iron cannot be used for vanadium extraction due to high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/22C21B11/00C21C5/30
CPCC22B34/22C21B11/00C21C5/30Y02P10/20
Inventor 文玉兵张卫强邹荣欧阳晨曦杨春雷潘杨勇付仕猛陈大双李金柱刘林刚
Owner WUKUN STEEL
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