Converter vanadium extraction process adopting top blowing oxygen lance to blow cooling agents

Abstract

The invention relates to a converter vanadium extraction process adopting a top blowing oxygen lance to blow cooling agents, belongs to the technical field of ferrous metallurgy, and is used for solving the problems that the temperature of a molten pool is difficult to control in the vanadium extraction course, the dynamic condition is poor and the like and increasing the oxidation conversion rate of vanadium and the quality of vanadium slag. The converter vanadium extraction process comprises a powder supply system and an oxygen supply system; and the cooling agents are blown through using a supersonic oxygen jet of the top blowing oxygen lance, and the aims of controlling the temperature of the molten pool in the vanadium extraction course and improving the stirring ability of the molten pool are achieved by utilizing a principle that powder rapidly reacts with hot iron to absorb heat, thereby achieving the technical effect of efficient vanadium extraction. The cooling agents enters the oxygen lance via a powder supply pipe in the powder blowing process; an outlet of the powder supply pipe can be positioned between the upper part of a lance body and an Raoult outlet of a blowing head; and the inner diameter of the powder supply pipeline is in the range of 15 to 180mm, the powder blowing flow rate is in the range of 20 to 800kg/min, the carrier gas flow rate is in the range of 100 to 4000Nm3/h, and the carrier gas pressure is in the range of 0.5 to 1.6Mpa. The converter vanadium extraction process is suitable for vanadium extraction converters of 200 to 300t; and by adopting the converter vanadium extraction process, the semi-steel vanadium content can be reduced to below 0.03 percent, and the quality of vanadium slag (V2O5) is increased by more than 1 percent, so that the recovery rate of vanadium resources is increased.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a smelting process for efficiently extracting vanadium by using a top-blown oxygen lance to spray a coolant in a vanadium extracting converter. Background technique [0002] Converter vanadium extraction is the use of oxygen to oxidize vanadium in molten iron into vanadium slag to obtain semi-steel that meets the requirements of the next step of steelmaking. During the vanadium extraction process, the oxidation of each element releases heat, and the temperature of the molten pool rises extremely fast. It can rise to the temperature where carbon reacts violently in 2-3 minutes, resulting in a violent carbon oxidation reaction, thereby inhibiting the oxidation of vanadium and increasing the oxidation loss of carbon elements. Therefore, in the process of extracting vanadium, it is necessary to take effective measures to prolong the reaction time of extr...

AI Technical Summary

Problems solved by technology

[0003] The traditional vanadium extraction process mainly adopts top-bottom re-blowing and special oxygen lance for vanadium extraction, etc. At the same time, massive coolants such as vanadium-containing pig iron blocks, iron ore, and iron oxide balls are added to control the temperature of the molten pool and slow down the heating rate of the molten pool. , to prolong the reaction time of vanadium extraction, but the vanadium extraction temperature of the converter is low and the blowing time is short, therefore, the cooling effect of the block coolant cannot be fully released, and it is easy to cause extreme cold and extreme heat locally in the molten pool, and even there is no coolant. The phenomenon of complete melting, unable to effectively control the temperature rise of the molten pool

[0004] The content of vanadium in vanadium-containing iron water is usually less than 1%, and the vanadium extraction process is inhibited due to the carbon-oxygen reaction, the stirring capacity of the molten pool is insufficient, and the kinetic conditions of the vanadium extraction reaction are poor. Therefore, the reaction speed and degree of the vanadium element during the vanadium extraction process Limited by mass transfer speed, it not only prolongs the blowing time, but also affects the recovery rate of vanadium, resulting in high iron loss in semi-steel residual vanadium and slag, resulting in waste of resources

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