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Method for preparing rare earth polishing powder

A rare earth polishing powder, polishing powder technology, applied in chemical instruments and methods, polishing compositions containing abrasives, other chemical processes, etc., can solve the problems of long use time, inability to satisfy the grinding speed at the same time, etc., to improve performance , The method is simple, the control effect is strong

Inactive Publication Date: 2010-06-16
西安迈克森新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of rare earth polishing powder, which solves the technical problem that the existing cerium-based abrasive materials in the background technology cannot simultaneously satisfy good grinding speed and long service time when grinding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Add a certain amount of La2O3 / TREO: 29.21%, CeO2 / TREO: 80.72% light rare earth solution into the reactor, start stirring, and at normal temperature will account for 4-10% by weight of the total weight of the rare earth input. The concentration is Slowly add 30-55% fluorine-containing acid solution into the rare earth solution, react for 5-10 minutes to fluoride the rare earth, and form a partially fluorinated rare earth fluoride precipitate, then heat the material in the reactor to keep the temperature of the material at 30 -45°C.

[0024] 2) At 30-45°C, add an oxalic acid solution with a concentration of 50-150g / L, which accounts for 117% of the total weight of the rare earth, dropwise at a constant speed within 30-40 minutes to the partially fluorinated rare earth material, and wait until the addition of the oxalic acid solution is completed After that, continue to stir and react for 10-12 minutes, so that the precursor precipitation of rare earth polishing powder ...

Embodiment 2

[0028] 1) Add a certain amount of La2O3 / TREO: 29.21%, CeO2 / TREO: 80.72% light rare earth solution into the reactor, start stirring, and at normal temperature will account for 5-8% by weight of the total weight of the rare earth input. The concentration is Slowly add 35-50% fluorine-containing acid solution into the rare earth solution, react for 6-8 minutes to fluoride the rare earth, and form a partially fluorinated rare earth fluoride precipitate, then heat the material in the reactor to keep the temperature of the material at 35 -40°C.

[0029] 2) At 35-40°C, add an oxalic acid solution with a concentration of 70-120 g / L, which accounts for 117% of the total weight of the rare earth, dropwise at a constant speed within 30-40 minutes to the partially fluorinated rare earth material, and wait until the addition of the oxalic acid solution is completed After that, continue to stir and react for 10-12 minutes, so that the precursor precipitation of rare earth polishing powder w...

Embodiment 3

[0033] 1) Add a certain amount of La2O3 / TREO: 29.21%, CeO2 / TREO: 80.72% light rare earth solution into the reactor, start stirring, and at normal temperature will account for 6-8% by weight of the total weight of the rare earth input. The concentration is Slowly add 40-50% fluorine-containing acid solution into the rare earth solution, react for 6-8 minutes to fluoride the rare earth, and form a partially fluorinated rare earth fluoride precipitate, then heat the material in the reactor to keep the temperature of the material at 35 -40°C.

[0034] 2) At 35-40°C, add an oxalic acid solution with a concentration of 80-100g / L, which accounts for 117% of the total weight of the rare earth, dropwise at a constant speed within 30-40 minutes to the partially fluorinated rare earth material, and wait until the addition of the oxalic acid solution is completed Then continue to stir and react for 10-12 minutes, so that the precursor precipitation of rare earth polishing powder with unif...

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Abstract

The invention relates to a method for preparing rare earth polishing powder, which specifically comprises the steps of firstly slowly mixing a certain amount of light rare earth solution with fluorine-containing acid solution, carrying out reaction for 5-10 minutes for fluoridizing rare earth, generating the precipitation of a partially fluoridized rare earth fluoride, further heating materials in a reaction kettle, keeping the temperature of the materials at 30-45 DEG C, adding oxalic acid solution, generating the precipitation of a rare earth polishing powder precursor with uniform particlesize, smashing till obtaining a precursor material with the average particle size of 1-3 mu m, roasting for 3-6h in an electric furnace at the temperature of 600-1000 DEG C, cooling, then re-smashingtill the average particle size of 2.0 mu m, and controlling the maximum particle size within 20 mu m for obtaining the rare earth polishing powder. The fluorine content is introduced when preparing the rare earth polishing powder in the method, and hydrofluoric acid solution or fluosilicic acid solution is used for direct co-precipitation with rare earth ions, thereby leading the fluorine to be bonded with the rare earth ions more evenly, producing favorable impacts on grinding and improving the performances of the rare earth polishing powder; furthermore, the method is simple and strong in controllability.

Description

technical field [0001] The invention relates to a preparation method of a rare earth polishing powder for polishing, in particular to a preparation method of a polishing powder containing a cerium group and mainly composed of lanthanum cerium oxide. Background technique [0002] Cerium-based abrasives are widely used for grinding various glass materials, especially in recent years, their application fields have been greatly expanded, and they are used for grinding glass materials of various optics and instruments, such as optical lenses, spherical optical glass, etc. . [0003] Cerium-based abrasives currently on the market are usually made from carbonates of cerium-based rare earths. However, cerium-based abrasive materials made of carbonates of cerium-based rare earths often have insufficient grinding performance. Especially in the process of high-speed polishing, not only a good grinding speed is required for the abrasive material, but also a long service life is require...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/14C09G1/02
Inventor 周成钢李勇贺晟李小剑
Owner 西安迈克森新材料有限公司
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