Preparation method of rare earth fluoride polishing powder and preparation method of rare earth fluoride polishing solution

Abstract

The invention discloses a preparation method of rare earth fluoride polishing powder and a preparation method of a rare earth fluoride polishing solution. The preparation method of rare earth fluoridepolishing powder comprises the steps of: 1) respectively taking rare earth carbonate and rare earth fluoride as precursor raw materials, mixing the rare earth carbonate and the rare earth fluoride ina ball mill, performing ball-milling until slurry particles D50 are 2.0-2.5 [mu]m, wherein a high-energy ball mill is adopted as the ball mill, and the solid content of ball-milled slurry is controlled to be 40-50%; 2) adding polyvinylpyrrolidone into the slurry treated in the step 1), performing mixing, and performing spray drying to obtain powder; and 3) calcining, refining and grading the powder obtained in the step 2) to prepare rare earth fluoride polishing powder. The invention also discloses a preparation method of a polishing solution by mixing the polishing powder and water. After the polishing powder prepared by the invention is applied to surface treatment, the high cutting rate is achieved on the premise of ensuring no surface defects such as scratches on the surface of optical glass, the preparation method is simpler, lower in and shorter in production period, and a large wastewater treatment system does not need to be arranged for each manufacturer.

Description

technical field [0001] The invention belongs to the technical field of optical glass surface ultra-flattening treatment, and in particular relates to a preparation method of a fluoride rare earth polishing powder and a fluoride rare earth polishing liquid. Background technique [0002] In recent years, with the vigorous development of the optical industry, the requirements for surface smoothness of materials are getting higher and higher, and the rare earth polishing powder products on the market are gradually becoming diversified. Therefore, the requirements for the variety and polishing performance of rare earth cerium-based polishing powder getting stricter. Pure CeO on the market 2 The cutting efficiency of high cerium polishing powder is lower than that of fluorine-containing rare earth cerium-based polishing powder. Therefore, for hard optical glass, the market share of fluorine-containing rare earth cerium-based polishing powder is large. [0003] At present, the fl...

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Problems solved by technology

Although this patent basically synchronizes the precipitation of the precursor with the fluorination process (precipitate a part first and then add hydrofluoric acid for precipitation and fluorination together), the preparation process still uses more acid liquid and discharges a large amount of Acid wastewater, and every manufacturer that prepares according to this method needs to design a wastewater treatment system or outsource the treatment at a high cost, which greatly increases the production cost

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