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Binary gas supply converter vanadium extraction method

A converter, vanadium-titanium technology, applied in the field of vanadium extraction in binary gas-supplied converters, can solve problems such as large carbon burning loss, increased residual vanadium, and reduced vanadium oxidation rate, and achieves good prospects for popularization and application, improved semi-steel quality, The effect of increasing the oxidation rate of vanadium

Active Publication Date: 2019-04-12
PANGANG GRP PANZHIHUA STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the temperature of molten iron is high and the exothermic elements are high, it is necessary to add a large amount of iron-containing materials and oxidants to control the process temperature to achieve the effect of reducing residual vanadium. 2 o 5 The problem of low carbon and large burning loss; when the resources of iron-containing materials are insufficient, there is no effective means and technology to control the temperature rise of the process, resulting in an increase in residual vanadium, a decrease in vanadium oxidation rate, and a decrease in vanadium recovery rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Vanadium-containing molten iron silicon 0.25wt%, molten iron temperature 1303°C, 140t vanadium-containing molten iron enters a 120-ton converter, blows gas through an oxygen lance for blowing, first blows O 2 and N 2 Mixed gas, N 2 Consumption ratio 20%, control oxygen flow rate 15000m 3 / h, nitrogen flow rate 4500m 3 / h; after blowing for 4.5min, adjust the oxygen flow rate to 13500m 3 / h, nitrogen flow 6500m 3 / h, at this time O 2 and N 2 Mixed gas, N 2 The consumption ratio is 30%, blowing 1min; the whole blowing time is 5.5min; the unit consumption of vanadium-extracting coolant is controlled at 30kg / t of vanadium-containing molten iron, which is added in batches within 2min of blowing; the semi-steel end carbon is 3.76%, and the temperature is 1385 ℃, the residual vanadium is 0.029%, the carbon burning loss rate is 11.7%, and the vanadium oxidation rate is 91.3%.

Embodiment 2

[0034] Vanadium-containing molten iron silicon 0.13wt%, molten iron temperature 1296 ° C, 140 tons of vanadium-containing molten iron enters a 120-ton converter, and blows gas through an oxygen lance for blowing. Pure O 2 Gas, control oxygen flow rate 17500m 3 / h; after blowing for 4.0min, adjust O 2 and N 2 Mixed gas, control oxygen flow rate 14500m 3 / h, nitrogen flow rate 5200m 3 / h,N 2 The consumption ratio is 22%; the unit consumption of vanadium-extracting coolant is controlled at 26kg / t of vanadium-containing molten iron, which is added in batches within 2 minutes of blowing; the semi-steel end carbon is 3.82%, the temperature is 1382°C, the residual vanadium is 0.026%, and the carbon burning rate is 10.8 %, the vanadium oxidation rate is 91.5%.

Embodiment 3

[0036] Vanadium-containing molten iron silicon 0.18wt%, molten iron temperature 1290°C, 140t vanadium-containing molten iron enters a 120-ton converter, blows gas through an oxygen lance for blowing, first blows O 2 Gas, control oxygen flow 17300m 3 / h; after blowing for 2.0min, adjust O 2 and N 2 Mixed gas, control oxygen flow rate 14500m 3 / h, nitrogen flow rate 4300m 3 / h,N 2 Consumption ratio 18%, blowing 2.0min; last 1.5min, control oxygen flow rate 13800m 3 / h, nitrogen flow rate 5600m 3 / h,N 2 The consumption ratio is 25%; the unit consumption of vanadium-extracting coolant is controlled at 28kg / t of vanadium-containing molten iron, which is added in batches within 2 minutes of blowing; the carbon at the end of semi-steel is 3.75%, the temperature is 1380°C, the residual vanadium is 0.028%, and the carbon burning rate is 11.1 %, the vanadium oxidation rate is 91.2%.

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Abstract

The invention discloses a binary gas supply converter vanadium extraction method, and belongs to the technical field of ferrous metallurgy. According to the binary gas supply converter vanadium extraction method, the gas supply blowing condition is adjusted according to different vanadium-titanium-iron melt, so that vanadium residue and the carbon burning loss are reduced, the vanadium oxidation rate is increased, and the quality of semisteel is improved. According to the method, two different gases are adopted for blowing in different proportions, the problems that the vanadium residue is high, and vanadium slag V2O5 is low under the conditions that molten iron has different temperature and different silicon contents are solved, and the vanadium residue is remarkably reduced after vanadium extraction, the vanadium oxidation rate is remarkably improved, the quality of the semisteel is improved, and the method has a good popularization and application prospect.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a method for extracting vanadium in a binary gas-supply converter. Background technique [0002] Vanadium-containing steel has the characteristics of high strength, toughness, wear resistance, and corrosion resistance, and is widely used in machine manufacturing, automobiles, aerospace, railways, bridges and other industries. With the rapid development of my country's economy, the market demand for vanadium-containing steel has increased significantly, which has led to an increase in the output of vanadium products such as high-vanadium iron and vanadium nitride. Panzhihua Iron and Steel Group Corporation is the world's second largest manufacturer of vanadium products, accounting for more than 90% of the domestic market share. The use of converters to extract vanadium from molten iron containing vanadium is a relatively common process for extracting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/30
CPCC21C5/30
Inventor 张家利李扬州杨森祥陈怀杰黄正华陈俊陈炼
Owner PANGANG GRP PANZHIHUA STEEL & VANADIUM