Method for implementing efficient extraction of vanadium from converter through CO2

Abstract

The invention belongs to the technical field of metallurgy, and relates to a method for implementing the efficient extraction of vanadium from a converter by using CO2 to solve the technical problems of lower oxidation conversation rate of vanadium and the like caused by the difficulty in temperature control and poor mixing capacity in the smelting process of a vanadium extracting converter. In the method, the amount of the CO2 supplied in the converter is controlled at different time intervals during the vanadium extraction; the CO2 is involved in the temperature control and strong mixing ofmolten pool reaction; the molten pool temperature is controlled to be between 1350 DEG C and 1400 DEG C in the reaction process of vanadium extraction; the mixing in the molten pool is enhanced; the partial pressure of CO in the converter is improved; the decarburizing reaction is inhibited; the extraction of the vanadium and the protection of carbon are promoted; and the oxidation conversation rate of the vanadium and the level of vanadium slag are improved. The method belongs to an environment-friendly process for extracting the vanadium, and is suitable for a 30 to 300-ton vanadium extracting converter, wherein the CO2 consumption for 1-ton steel is 5-50kg / t. When the method is adopted, the vanadium extraction rate of the converter can be improved by 3-15%, the level of the vanadium slag can be improved by more than 1%, and the purpose of effectively extracting the vanadium from the converter can be achieved.

Description

technical field [0001] The invention belongs to the field of metallurgical technology, and in particular relates to a high-efficiency vanadium extraction method suitable for a 30-300-ton vanadium extraction converter, which improves the oxidation conversion rate of vanadium in the converter, reduces residual vanadium in semi-steel, and improves the grade of vanadium slag. Background technique [0002] The converter vanadium extraction process usually uses oxygen as an oxidant to complete oxidation reactions such as vanadium extraction. Since oxygen reacts with silicon, manganese, vanadium, titanium and some carbon elements, a large amount of heat is generated, so the temperature of the molten pool in the converter vanadium extraction process quickly rises to 1400 The conditions for vanadium extraction will be worse if the temperature is higher than ℃. At this stage, the temperature is mainly controlled by adding block coolants such as pig iron, iron ore, iron oxide scale, a...

AI Technical Summary

Problems solved by technology

At this stage, the temperature is mainly controlled by adding block coolants such as pig iron, iron ore, iron oxide scale, and scrap steel, which has achieved certain results. At the same time, due to the fast vanadium extraction rhythm and low temperature, the block coolant is not easy to completely melt, and its effective cooling effect cannot be fully exerted, which is not conducive to the smooth progress of the vanadium extraction reaction.

[0003] The content of vanadium in vanadium-containing iron water is only 0.25%-0.4%, and the process of vanadium extraction is inhibited by the carbon-oxygen reaction, and the reaction kinetics conditions are poor. Therefore, the reaction speed and degree of vanadium in the process of vanadium extraction are limited by the mass transfer rate. , which not only prolongs the blowing time, but also affects the recovery rate of vanadium, resulting in high iron loss in the remaining vanadium in the semi-steel and in the slag, resulting in a waste of resources