Method for comprehensively utilizing vanadium slag

Abstract

The invention relates to a method for comprehensively utilizing vanadium slag, belongs to the field of resource reclamation, and aims to solve the technical problem of providing the method for comprehensively utilizing the vanadium slag. The method comprises the following steps: a, acid leaching at oxygen pressure, namely at oxygen pressure, adding sulfuric acid into the vanadium slag, stirring and filtering to obtain leaching liquid and leaching slag; b, leaching liquid extraction, namely regulating the pH value of the leaching liquid, and extracting to obtain extraction liquid and raffinate; c, vanadium-containing solution preparation, namely carrying out back extracting on the extraction liquid to obtain subnatant which is the vanadium-containing solution; d, electrolytic manganese preparation, namely regulating the pH value of the raffinate, adding ammonium sulfate and selenium dioxide, and electrolyzing to obtain the electrolytic manganese; and e, titanium dioxide preparation, namely adding sulfuric acid into the leaching slag which is obtained in the step a to perform secondary acid leaching, heating, reducing, freezing, crystallizing, filtering, hydrolyzing, filtering, washing, evaporatively crystallizing and calcining to obtain the titanium dioxide. The method can be used for comprehensively reclaiming and recycling vanadium slag.

Description

technical field [0001] The invention relates to a comprehensive utilization method of vanadium slag, which belongs to the field of resource recovery. Background technique [0002] Vanadium is an element of important strategic value. It has the advantages of hard texture, high melting point, non-magnetism, and good toughness. At the same time, as an alloy additive, it has super grain refinement and precipitation strengthening effects, so it is widely used in steel Industry, aerospace industry, and medical, battery and other fields. As the most important industrial raw material for extracting vanadium at present, converter vanadium slag has relatively complex elemental composition, low content of valuable elements, and relatively stable chemical structure. Generally, the dense vanadium-iron tips in vanadium slag can only be destroyed by means of enhanced oxidation and roasting. The spar structure can effectively recover the vanadium in the vanadium slag. At present, in the v...

AI Technical Summary

Problems solved by technology

[0005] Since the beginning of this century, there are some defects in the vanadium extraction process of converter vanadium slag roasting-leaching: (1) The process flow is long and the material consumption is large; (2) A large amount of industrial waste gas is produced, polluting the atmosphere; (3) Vanadium slag Poor comprehensive utilization of resources

This process has a good leaching effect for raw materials with high calcium content, but the roasting process is complicated, the process is long, and a large amount of harmful gases are generated during the production process, which pollutes the environment;

[0008] (3) Chinese patent 201010514573.8 "A method for extracting vanadium by wet method using vanadium-containing titanium converter slag" adopts non-calcined oxygen pressure leaching technology, and then performs ion exchange on the leaching solution to obtain relatively pure vanadium-containing exchange liquid, NaOH desorption, vanadium precipitation , calcined to obtain V 2 o 5 , but the total vanadium yield is not high;

[0009] (4) Chinese patent 201410290331.3 "Method for extracting vanadium from converter vanadium slag" provides a vanadium extraction technology using non-roasting atmospheric pressure leaching-extraction-reextraction. After four-stage cross-flow extraction, the total vanadium yield of the three-stage process reaches More than 95%, but the leachate and extract of this process must be pretreated before the next step, and the valence control of vanadium is relatively strict, and the treatment is relatively complicated;

[0010] (5) Chinese patent 20060048733.8 "Method for oxidative conversion and leaching of vanadium from converter steelmaking slag under pressure field" discloses a method of oxygen pressure for steelmaking converter vanadium slag without roasting under pressure field oxidation atmosphere conditions Extraction of vanadium by leaching technology, using 50% to 98% concentrated sulfuric acid to destroy the hard vanadium iron spinel structure in the vanadium slag, avoiding the strong corrosive products produced by adding fluoride salt fluxing, is a low-pollution treatment method, but still has many deficiencies

Images