New method of using novel extracting agent to extract scandium oxide from titanium dioxide waste acid

Abstract

The invention discloses a novel method of using a novel extracting agent to extract scandium oxide from titanium dioxide waste acid. The method comprises the following steps of: S1, preparation of rawmaterials: preparing a titanium dioxide waste acid water raw material and a concentrated sulfuric acid raw material; S2, sulfuric acid dissolution: adding water and a concentrated sulfuric acid solution into titanium dioxide waste acid water, stirring and mixing; S3, precipitation: adding a flocculating agent into the mixed solution, performing precipitation, and filtering the after-precipitationsolution; and S4, washing: adding water, sulfuric acid and hydrogen peroxide into the filtered solution, mixing and stirring, adding hydrogen peroxide, and continuously stirring. According to the method, a new extraction method is carried out by adopting dioctyl phosphate and tributyl phosphate to replace a traditional old extracting agent; during extraction, the separation effect is better, therecovery rate is high, the scandium oxide can be further purified, the extraction rate is increased from about 60% to 85%, and the price of the dioctyl phosphate and the tributyl phosphate is low; andfurthermore, the added flocculating agent is cheap and practical, and the flocculating agent is non-toxic and high in flocculating capacity.

Description

technical field

[0001] The invention specifically relates to the technical field of the chemical industry, in particular to a new method for extracting scandium oxide from titanium white waste acid with a novel extractant. Background technique

[0002] Scandium is an important rare earth element. The good application and scarcity of its oxides and alloys in the fields of aerospace, electric light source and clean energy have attracted more and more attention. At present, scandium resources mainly exist in waste titanium dioxide. In the acid, the process of domestic production of high-purity scandium oxide is mainly divided into two steps. First, the traditional extraction and alkali stripping process is used to enrich scandium oxide from the waste acid of sulfuric acid process titanium dioxide and scandium-containing materials to form scandium-containing alkali cakes. Then adopt multiple inorganic precipitation separation and impurity removal processes of acid dissolution, h...

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