Preparation method of rare earth polishing powder

A kind of rare earth polishing powder, rare earth technology, applied in the direction of polishing composition containing abrasives, etc., can solve the problems of large gap, hard polishing powder, high temperature, etc., achieve the effect of small particle size, uniform dispersion, and reduce energy and equipment consumption

Inactive Publication Date: 2014-09-03
山东麦丰新材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 eart

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation method of rare earth polishing powder comprises the following steps:

[0027] (1) Pass the mixed rare earth (the mass fraction of cerium oxide is 75%, the mass fraction of lanthanum oxide is 25%) through the mixed solution of ammonium bicarbonate and ammonia water at a temperature of 45°C (the mass ratio of ammonium bicarbonate and ammonia water is 1 :1) Precipitate, age for 12 hours, and then add mixed fluorine-containing acid (the mass ratio of hydrofluoric acid to fluorosilicic acid is 4:1, and the mass ratio of mixed fluorine-containing acid to mixed rare earth is 7%) for fluorination, Obtain fluorinated basic rare earth carbonate;

[0028] (2) Put the fluorinated basic rare earth carbonate obtained in step 1 into a shuttle industrial furnace for roasting to obtain mixed rare earth oxides. The roasting steps are as follows:

[0029] In the first stage, the temperature is raised to 420°C in 1.5 hours;

[0030] In the second stage, heat preservation ...

Embodiment 2

[0035] The preparation method of rare earth polishing powder comprises the following steps:

[0036] (1) Pass the mixed rare earth (the mass fraction of cerium oxide is 80%, the mass fraction of lanthanum oxide is 20%) through the mixed solution of ammonium bicarbonate and ammonia water at a temperature of 55°C (the mass ratio of ammonium bicarbonate and ammonia water is 1 :1) Precipitate, age for 18 hours, and then add mixed fluorine-containing acid (the mass ratio of hydrofluoric acid to fluorosilicic acid is 4:1, and the mass ratio of mixed fluorine-containing acid to mixed rare earth is 7%) for fluorination, Obtain fluorinated basic rare earth carbonate;

[0037] (2) Put the fluorinated basic rare earth carbonate obtained in step 1 into a shuttle industrial furnace for roasting to obtain mixed rare earth oxides. The roasting steps are as follows:

[0038] In the first stage, the temperature is raised to 440°C in 1.5 hours;

[0039] In the second stage, heat preservation ...

Embodiment 3

[0044] The preparation method of rare earth polishing powder comprises the following steps:

[0045] (1) Pass the mixed rare earth (the mass fraction of cerium oxide is 75%, the mass fraction of lanthanum oxide is 25%) through the mixed solution of ammonium bicarbonate and ammonia water at a temperature of 50°C (the mass ratio of ammonium bicarbonate and ammonia water is 1 :2) Precipitate, age for 12 hours, and then add mixed fluorine-containing acid (the mass ratio of hydrofluoric acid to fluorosilicic acid is 5:1, and the mass ratio of mixed fluorine-containing acid to mixed rare earth is 6%) for fluorination, Obtain fluorinated basic rare earth carbonate;

[0046] (2) Put the fluorinated basic rare earth carbonate obtained in step 1 into a shuttle industrial furnace for roasting to obtain mixed rare earth oxides. The roasting steps are as follows:

[0047] In the first stage, the temperature is raised to 480°C in 1.5 hours;

[0048] In the second stage, heat preservation ...

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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...

Claims

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Application Information

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IPC IPC(8): C09G1/02
Inventor 于长江王兆敏王猛郝丽萍
Owner 山东麦丰新材料科技股份有限公司
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