Method for recovering scandium in acid solution

Abstract

The invention relates to a method for recovering scandium in an acid solution. The method includes the steps that sodium hydroxide is added to the scandium-containing acid solution for stirring and impurity removing work, the acid solution obtained after impurity removing is filtered, and a high-purity scandium-containing solution is obtained; the high-purity scandium-containing solution and charcoal are mixed and are subjected to shock adsorption for 10-30 min under the conditions that the liquid and solid mass ratio is 100:0.2-1, the shock frequency is 10-30 times / min, and the shock temperature is 30-60 DEG C; adsorption saturation scandium-containing charcoal is roasted at a high temperature, and primary discandium trioxide is obtained; and then the primary discandium trioxide is leached through a hydrochloric acid solution, part of impurities are removed, and a high-purity discandium trioxide product is obtained, wherein the purity of the product is larger than 99.5%, and the scandium recovery rate is larger than 97%. Acid waste water generated in the technological process returns to serve as a leaching solvent for extracting scandium. The method has the beneficial effects that the technological operation is simple, technological parameters are easy to control, the scandium recovery rate is high, the chemical dosage is small, the product purity is high, and industrial waste water can be recycled.

Description

technical field [0001] The invention belongs to the technical field of scandium hydrometallurgy, and in particular relates to a method for recovering scandium in an acid solution. Background technique [0002] Scandium is an important transition rare earth element, which is widely used in lighting industry, alloy industry, ceramic materials, catalytic chemistry, nuclear energy industry and fuel cells due to its good physical and chemical properties. The content of scandium 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 in the process of smelting alumina in bauxite, and the content of scandium can be enriched To more than 0.01%, hydrochloric acid, sulfuric acid, etc. can be used as leaching agents to dissolve scandium into acid solution (Fan Yanjin, He Hangjun, Zhang Jianfei, et al. Research on the technology of extracting scandium...

AI Technical Summary

Problems solved by technology

Scandium-containing acid solution generally has a low concentration of scandium, and there are many types and high content of impurity ions. The extraction process requires multi-stage extraction and back-extraction operations, and impurity ions will also be extracted. The extraction tail liquid contains some organic phases that are difficult to handle. At the same time, in The extraction process is prone to emulsification, resulting in the inability to separate the two phases and the serious loss of organic chemicals, and the purity of the final product scandium trioxide is low

[0004] Therefore, this method has defects such as cumbersome extraction process operation, difficult control of process parameters, low scandium recovery rate, large dosage of medicament, low purity of product scandium trioxide and difficult wastewater treatment generated in the process.

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