Method for extracting vanadium through composite blowing of converter

A converter and nitrogen technology, applied in the manufacture of converters, etc., can solve problems such as the inability to meet the kinetic conditions of the blowing process, the difficulty in achieving mutual coordination of vanadium extraction, and the adverse effects of steelmaking operations, so as to improve oxygen utilization and meet The needs of thermodynamic conditions and kinetic conditions, the effect of improving economic and technical indicators

Inactive Publication Date: 2011-07-20
HEBEI IRON AND STEEL
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Problems solved by technology

However, the following problems often occur in the actual blowing process: due to the change of molten iron conditions, such as molten iron with high Si+Ti content, the temperature of the molten pool rises too fast during the blowing process with pure oxygen, which inhibits the oxidation of vanadium, resulting in residual In the case of high vanadium and low vanadium recovery rate, if a small flow rate of oxygen is used, the oxygen supply pressure will be small, which cannot meet the dynamic conditions of the blowing process, which also leads to high residual vanadium in semi-steel
For molten iron with low Si+Ti conten

Method used

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Experimental program
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Effect test

Embodiment 1

[0034] Vanadium extraction furnace 1:

[0035] The main components of vanadium-containing molten iron are C: 4.78%, Si+Ti: 0.82%, Mn: 0.18%, V: 0.258%, and the molten iron temperature is 1265°C. According to the above molten iron conditions, set the oxygen flow rate to 5550 m3 / h and nitrogen flow rate It is 18500m3 / h, the flow ratio of oxygen and nitrogen is 0.3, and the gas pressure after mixing is 1.2MPa. Put vanadium-containing molten iron into the converter. After the converter is shaken, the oxygen lance is lowered to the blowing position to start gas supply. After the oxygen gun is lowered to the oxygen opening point, first open the nitrogen regulating valve, and then open the oxygen regulating valve after the nitrogen flow reaches 18500m3 / h, so that oxygen and nitrogen are simultaneously supplied to the molten pool to achieve composite injection to the molten pool. During the blowing process, uniformly add loose coolants such as iron oxide skin balls, cold-solid pellets, ...

Embodiment 2

[0037] Vanadium extraction furnace 2:

[0038] The main components of vanadium-containing molten iron are C: 4.35%, Si+Ti: 0.24%, Mn: 0.20%, V: 0.333%, and molten iron temperature is 1272℃. According to the above molten iron conditions, set the oxygen flow rate to 10500 m3 / h and nitrogen flow rate It is 3500m3 / h, the flow ratio of oxygen and nitrogen is 3.0, and the gas pressure after mixing is 0.7MPa. Put vanadium-containing molten iron into the converter. After the converter is shaken, the oxygen lance is lowered to the blowing position to start gas supply. After the oxygen lance is lowered to the open oxygen point, first open the nitrogen regulating valve, and then open the oxygen regulating valve after the nitrogen flow reaches 3500m3 / h, so that oxygen and nitrogen are simultaneously supplied to the molten pool to achieve composite injection to the molten pool. During the blowing process, uniformly add loose coolants such as iron oxide skin balls, cold-solid pellets, hot-pre...

Embodiment 3

[0040] Vanadium extraction furnace 3:

[0041] The main components of vanadium-containing molten iron are C: 4.52%, Si+Ti: 0.55%, Mn: 0.14%, V: 0.288%, and the molten iron temperature is 1270℃. According to the above molten iron conditions, set the oxygen flow rate to 8500 m3 / h and nitrogen flow rate It is 8500m3 / h, the ratio of oxygen to nitrogen flow rate is 1.0, and the gas pressure after mixing is 0.85MPa. Put vanadium-containing molten iron into the converter. After the converter is shaken, the oxygen lance is lowered to the blowing position to start gas supply. After the oxygen lance drops to the oxygen opening point, first open the nitrogen regulating valve, and then open the oxygen regulating valve after the nitrogen flow reaches 8500m3 / h, so that oxygen and nitrogen are simultaneously supplied to the molten pool to achieve composite injection to the molten pool. During the blowing process, uniformly add loose coolants such as iron oxide skin balls, cold-solid pellets, h...

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Abstract

The invention relates to a method for extracting vanadium through composite blowing of a converter, and belongs to the technical field of vanadium extraction through converters in the metallurgy industry. Mixed gas of oxygen and nitrogen replaces pure oxygen to perform composite blowing on vanadium-containing molten iron; meanwhile, vanadium extraction is performed through bottom blowing of nitrogen or other inert gas of the converter; and by reducing the concentration of oxygen in a gas medium provided for a molten pool and ensuring the gas supply pressure required by stirring the molten pool, the temperature of the molten pool in the blowing process is raised stably and the requirement of vanadium extraction dynamics is met. By implementing the composite blowing in the vanadium extraction process, compared with a method of blowing with pure oxygen through an oxygen gun, the method has the advantages that: various economic and technical norms for vanadium extraction are improved obviously, considerable economic benefit is created, good conditions are created for the next procedure after the vanadium extraction, and the stable and smooth production of the previous and next procedures is ensured. The method is operated on the conventional converter gas supply system, investment is not needed to be increased, the ratio of both can be flexibly regulated, and the vanadium extraction requirements under different molten iron conditions are met.

Description

Technical field [0001] The invention relates to a converter compound injection method for extracting vanadium, belonging to the technical field of converter vanadium extraction in the metallurgical industry. Background technique [0002] The main task of converter vanadium extraction is to oxidize vanadium in the molten iron by supplying oxygen to the molten pool. At the same time, cooling materials are used to control the temperature of the molten bath and inhibit the oxidation of carbon in the molten iron to meet the requirement of converting vanadium-containing molten iron into high carbon content. And meet the requirements of semi-steel required for the next step of steelmaking, maximize the oxidation of vanadium in the molten iron into the vanadium slag, and obtain the vanadium slag suitable for the next step of extracting V2O5 by extracting vanadium. That is, the vanadium extraction process needs to maximize Realize "Vanadium removal and carbon preservation". [0003] The va...

Claims

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Application Information

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IPC IPC(8): C21C5/28
Inventor 白瑞国国富兴韩春良闫杰翁玉娟王金星
Owner HEBEI IRON AND STEEL
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