Method for preparing lanthanum cerium oxalate from rare earth polishing powder waste residue

Abstract

The invention relates to the technical field of material preparation, in particular to a method for preparing lanthanum cerium oxalate from rare earth polishing powder waste residue. The method comprises the following steps: reacting to leach the recovered rare earth polishing powder waste residue in concentrated sulfuric acid to obtain a lanthanum cerium sulfate solution; separating the lanthanum cerium sulfate solution from solid residue, and adding oxalic acid to obtain a lanthanum cerium oxalate precipitate; and filtering and separating the lanthanum cerium oxalate precipitate, washing to neutrality, and drying to obtain the finished lanthanum cerium oxalate product. Fluorides such as hydrogen fluoride are not required, the polishing powder waste residue is scientifically and reasonably utilized comprehensively, and the whole recovery process is environment-friendly. The method has the characteristics of small investment, low recovery cost, simple process flow, high recovery rate, environment friendliness and the like.

Description

technical field [0001] The invention relates to material preparation technology, and further refers to a method for preparing lanthanum cerium oxalate from rare earth polishing powder waste residue. Background technique [0002] With its unique physical and chemical properties and excellent polishing performance, rare earth polishing powder has been widely used in the precision polishing of glass devices such as display glass, optical glass, jewelry and precision instruments. With the increase in the amount of rare earth polishing powder and the country's protective mining of rare earth mineral resources, on the one hand, the supply of rare earth polishing powder is becoming increasingly tight; on the other hand, the waste residue of rare earth polishing powder formed during the use of rare earth polishing powder is also increasing. . Rare earth polishing powder waste residue is mainly adhering to various parts of the polishing equipment and gradually condensing massive ...

AI Technical Summary

Problems solved by technology

Although this method can effectively recover rare earth components, the traditional smelting process is complicated, the recovery cost is high, and the pollution to the environment is relatively large.