Method for preparing low-sulfur rare earth oxide through hydroxide precipitation

Abstract

The invention discloses a method for preparing a low-sulfur rare earth oxide through hydroxide precipitation. The method mainly comprises the following steps: 1, adding a soluble organic matter containing malic acid, acetylacetone and the like into a rare earth sulfate solution for mixing, so as to prepare a primary precipitation solution; 2, adding one or more alkaline precipitants into the primary precipitation solution for a precipitation reaction, wherein the consumption of the alkaline precipitants is 105-120% of the theoretical consumption of rare earth precipitating in the rare earth sulfate solution; and 3, carrying out solid-liquid separation to obtain a rare earth hydrate precipitate and a precipitation mother liquor, and subjecting the rare earth hydrate precipitate to calcination at 600-900 DEG C to obtain the low-sulfur rare earth oxide. The method provided by the invention has the advantages that through competitive coordination with sulfate, chemical adsorption of sulfate ions is avoided; meanwhile, a homogeneous-phase-like precipitation system can be formed, the forming of a crystalline precipitation is facilitated, and the precipitation process is simple and easy to control; the organic matter entering rare earth hydrate can be removed through roasting; and finally, the low-sulfur rare earth oxide can be obtained

Description

technical field [0001] The invention relates to the field of rare earth hydrometallurgy, in particular to a method for preparing low-sulfur rare earth oxides by a hydroxide precipitation method. Background technique [0002] Due to their unique 4f sublayer electronic structure, large atomic magnetic moment, strong spin-orbit coupling, and variable coordination numbers, the compounds formed by rare earth elements have very rich magnetic, optical, electrical, and catalytic properties. Functional properties, known as "the vitamin of modern industry" and "treasure house of new materials". Among them, rare earth oxides are an important class of rare earth compounds. They are also the main raw materials for the preparation of other rare earth compounds, and are widely used in the preparation of rare earth magnetic materials, luminescent materials, hydrogen storage materials, crystal materials, catalytic materials and other high-tech materials. . [0003] At present, there are va...

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Problems solved by technology

[0005] The present invention aims at the problem that the sulfate group in the rare earth hydroxide precipitation obtained by the precipitation of rare earth sulfuric acid solution is too high, and provides a method for preparing low-sulfur rare earth oxides by direct precipitation with simple process and convenient operation.