Preparation method of rare earth polishing powder

Abstract

The invention discloses a preparation method of rare earth polishing powder. The preparation method comprises the following steps of (1) precipitating mixed rare earth through an ammonium hydrogen carbonate and ammonia water mixed solution, ageing, and then, adding mixed fluorine-contained acid to fluorinate to obtain fluorinated alkaline rare earth carbonate, wherein mixed rare earth is cerium lanthanum chloride rare earth or cerium lanthanum chloride rare earth, and mixed fluorine-contained acid is mixed acid of hydrofluoric acid and fluosilicic acid; (2) carrying out multi-stage roasting on fluorinated alkaline rare earth carbonate obtained in the step (1) to obtain a mixed rare earth oxide, wherein the mixed rare earth oxide is an oxygen cerium fluoride and cerium oxide mixture or an oxygen cerium lanthanum fluoride and cerium oxide mixture; (3) smashing the mixed rare earth oxide obtained in the step (2), and grading to obtain the rare earth polishing powder with the particle size of 0.3-0.5mu m. The preparation method can be used for preparing ultrafine rare earth polishing powder which is capable of reaching the angstrom grade on a glass polished surface, uniform in dispersion and small in particle size.

Description

technical field [0001] The invention relates to a preparation method of rare earth polishing powder. Background technique [0002] Rare earth polishing powder is generally used for polishing lenses, flat glass, glass shells, glasses, watch cases, etc. In recent years, it has been widely used in functional ceramics, catalysis, luminescence, gas sensors, fuel cells, and ultraviolet absorption. . In addition, the function and performance requirements of rare earth polishing powder are getting higher and higher, especially the processing size and surface requirements of blue glass are getting higher and higher. The gap between the particle size and polishing performance of the existing polishing powder is relatively large. Some manufacturers The rare earth polishing fluid was invented to solve the problem by chemically improving the polishing powder and the polishing environment, but correspondingly brought environmental problems. At present, the rare earth polishing powder is...

AI Technical Summary

Problems solved by technology

In addition, the function and performance requirements of rare earth polishing powder are getting higher and higher, especially the processing size and surface requirements of blue glass are getting higher and higher. The gap between the particle size and polishing performance of the existing polishing powder is relatively large. Some manufacturers The rare earth polishing fluid was invented, which was solved by chemically improving the polishing powder and the polishing environment, but correspondingly brought environmental problems

At present, rare earth polishing powder is generally made by one-time roasting, the temperature is high, and the fired polishing powder is relatively hard, which cannot meet the requirements.