Technology for purifying scandium, titanium and vanadium from acid solution step by step

Abstract

The invention relates to a technology for purifying scandium, titanium and vanadium from an acid solution step by step. According to the technology, the acid solution obtained by leaching red mud through sulfuric acid is subjected to three-time extraction work, and an extraction organic phase is composed of a P507 extraction agent, a TBP synergist and sulfonated kerosene; in the first-time extraction process, the acid solution is directly subjected to scandium extraction and enrichment without pH value adjustment, after two-phase separation, a scandium-enriched organic phase and a titanium and vanadium containing solution are obtained, the scandium-enriched organic phase is subjected to sulfuric acid scrubbing and reverse extraction of sodium hydroxide, and scandium-enriched liquid is obtained; after the titanium and vanadium containing solution is subjected to pH value adjustment, the second-time extraction work is conducted for enrichment and separation of titanium, after two-phase separation, a titanium-enriched organic phase and a vanadium-containing solution are obtained, and after the titanium-enriched organic phase is subjected to sulfuric acid scrubbing and reverse extraction of hydrofluoric acid, titanium-enriched liquid and the vanadium-containing solution are obtained; and after the vanadium-containing solution is subjected to pH value adjustment and reducing treatment, the third-time extraction is conducted, and after two-phase separation, a vanadium-enriched organic phase and raffinate are obtained. The technology has the beneficial effects that the separation efficiency is high, the enrichment multiple is large, the technology is simple, and the number of the kinds of extraction agents is small.

Description

technical field [0001] The invention belongs to the technical field of separation and purification of rare metals, and in particular relates to a stepwise purification process of scandium, titanium and vanadium in an acid solution. Background technique [0002] Scandium, titanium and vanadium are important transition rare elements, which are widely used in lighting industry, alloy industry, ceramic materials, catalytic chemistry, nuclear energy industry and fuel cells due to their good physical and chemical properties. There are very few rich deposits of such rare and precious metals, especially scandium content in the earth's crust is very low. It is generally believed that the content of scandium in the ore is 0.002% to 0.005% which is an important scandium resource. Red mud is the tailings produced during the production of alumina from bauxite, and generally contains scandium, titanium, vanadium and other rare metals. [0003] At present, the methods of extracting rare m...

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Problems solved by technology

It is difficult to separate rare metals in the extraction process, there are many types of extraction agents and high consumption, the concentration and enrichment factor is low, and the impurity content of each rare metal solution after stripping is high and needs to be removed.

[0004] Therefore, in this method, there are many kinds of extractants and large consumption during the extraction process, the separation effect of scandium, titanium and vanadium is poor, the enrichment factor is low, the removal rate of impurity ions is low, and the impurity content in scandium-rich liquid, titanium-rich liquid and vanadium-rich liquid is high, etc. defect

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