Method for extracting vanadium through composite blowing of converter

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...

AI Technical Summary

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 content, if the dynamic conditions are satisfied, the oxygen supply method with higher pressure is adopted. At the same time, in order to ensure the cooling conditions and the end temperature, as the oxygen flow rate increases, the carbon element will inevitably be depleted. A large number of losses, resulting in low carbon in semi-steel, which will adversely affect subsequent steelmaking operations

Therefore, it is difficult to coordinate the kinetics and thermodynamic conditions of the vanadium extraction process by using pure oxygen for blowing, which will bring certain adverse effects to the vanadium extraction operation.

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