Method for preparing oil-free rare earth carbonate

Abstract

The invention discloses a scale preparation method for producing oil-free rare earth carbonate. The method is characterized by comprising the following steps of: (1) performing oil removal treatment on single or mixed rare earth chloride liquid, rare earth nitrate liquid, rare earth sulfate liquid and precipitating agent; (2) preparing single rare earth carbonate or mixed rare earth carbonate solid from sediment; and (3) bleaching, centrifuging and dehydrating the solid. The prepared oil-free single rare earth carbonate or oil-free mixed rare earth carbonate has powdery solid appearance and good acid dissolubility, the solution is clear, and the insoluble substances are less than or equal to 0.2 percent. The method has the advantages of strong adaptability, low equipment investment, convenient operation, low cost, more than 97 percent of yield and stable product quality, is easy to realize scale production of the oil-free rare earth carbonate, and solves the problem of poor acid dissolubility (the oil is much and the insoluble substances are more than 0.5 percent) of the common rare earth carbonate at the same time.

Description

technical field [0001] The invention relates to a preparation method of rare earth products, in particular to a preparation method of oil-free rare earth carbonate. Background technique [0002] Rare earths are known as "industrial vitamins". They have excellent optical, electrical, magnetic, superconducting, catalytic and other physical properties, and can be combined with other materials to form new materials with different properties and varieties. It is an indispensable core resource for strategic emerging industries such as new energy and new materials. At present, in addition to strict requirements on chemical properties such as the purity of rare earth carbonates and the content of non-rare earth impurities, the international and domestic markets also have high requirements on physical properties such as acid solubility, particle size, and specific gravity. As an intermediate compound raw material, the acid solubility of rare earth carbonate is particularly important...

AI Technical Summary

Problems solved by technology

The above-mentioned method is mainly to solve the problem of whereabouts of cerium nitrate mother liquor, involves a narrow area, and uses cerium carbonate as a filter cake to filter and remove oil, and the filtration is slow and the yield is low. It is not suitable for large-scale production of oil-free cerium carbonate, and this method is only for cerium nitrate mother liquor Degreasing was carried out, but the precipitation agent (ammonium bicarbonate water) was not degreased. The acid solubility of the oil-free cerium carbonate obtained by this method did not meet the customer's requirements