Method for purifying and refining high-purity scandium oxide from scandium hydroxide intermediate product

Abstract

The invention discloses a method for purifying and refining high-purity scandium oxide from a scandium hydroxide intermediate product, which comprises the following steps: calcining the scandium hydroxide intermediate product to obtain crude scandium oxide; adding water into the crude scandium oxide for slurrying, adding inorganic acid to adjust the pH value to 1.0-3.0, and conducting filtering and washing to obtain first-stage leaching residues; putting the first-stage leaching residues into an inorganic acid solution, and conducting filtering to obtain a second-stage leaching solution; performing extraction and phase splitting on the second-stage leaching solution by using an extraction agent P350, and then performing reverse extraction and phase splitting to obtain a scandium-containingreverse extraction solution; adding an oxalic acid solution into the scandium-containing reverse extraction solution, adding a back-regulating agent to regulate the pH value to 0.5-2.0, and conducting filtering and washing to obtain scandium oxalate precipitate; and calcining the scandium oxalate precipitate to obtain refined high-purity scandium oxide. Aiming at the characteristic difference ofscandium oxide and impurity elements, the high-purity scandium oxide is prepared by combining the segmented leaching and extraction processes, so that the process flow can be greatly shortened.

Description

technical field [0001] The invention belongs to the field of rare earth metallurgy, and in particular relates to a method for purifying high-purity scandium oxide from scandium hydroxide intermediate products. Background technique [0002] As a rare earth metal element, scandium is widely used in lighting industry, alloy industry, ceramic materials, catalytic materials and other fields. For example, aluminum-scandium alloys made of scandium and aluminum are widely used in aerospace, aviation, missiles, ships and other fields due to their advantages such as low density, high strength, high hardness, and good thermal stability, and are gradually turned to civilian applications, such as sports equipment, computers, etc. , mobile phone case, etc. Scandium sodium halogens made of scandium oxide are widely used in lighting in various occasions due to their good luminosity, energy saving, long life, and strong fog breaking ability. Lasers made of high-purity scandium oxide and va...

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Problems solved by technology

[0004] In view of the cumbersome process and poor pertinence of the preparation of high-purity scandium oxide in the prior art, the present invention uses scandium hydroxide as the starting material, and aims at the difference in properties between scandium oxide and impurity elements, and combines the process of segmental leaching and extraction, Prepared high-purity scandium oxide, which can greatly shorten the process flow

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