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Preparation method of rare-earth polishing powder containing fluorine and phosphorus

A rare earth polishing powder and rare earth carbonate technology, applied in chemical instruments and methods, other chemical processes, etc., can solve problems such as the inability to effectively control the crystal formation form, and achieve good polishing performance, high grinding ability, and good surface accuracy.

Inactive Publication Date: 2012-12-12
GANSU UNITED NEW RARE EARTH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

An important method to improve polishing powder is to control the crystal form, particle shape and size, and surface physical and chemical properties by adding a second element. Adding fluorine-containing or phosphorus-containing compounds alone cannot effectively control the formation of crystals.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: a kind of preparation method of the rare earth polishing powder containing fluorine, phosphorus, is characterized in that, comprises the steps:

[0022] (1) Precipitation: add ammonium bicarbonate aqueous solution to 100 liters of rare earth chloride solution until the pH value is 6.4 to 6.8, and the precipitation is complete to obtain rare earth carbonate, which is washed with water for 2 to 3 times; the mass concentration of rare earth chloride solution is 200 grams / L, the relative content of each rare earth component (based on oxide mass) is: La 2 o 3 34%; CeO 2 56%; 6 o 11 6 %;Nd 2 o 3 4 %;

[0023] (2) Fluorine-phosphorus composite additive treatment: Take 2460 grams of sodium fluoride and 1340 grams of phosphoric acid, add 830 liters of pure water to make a composite additive solution; add the prepared composite additive to the slurry formed by rare earth carbonate precipitation and water The solution is processed, and then the so...

Embodiment 2

[0030] Example 2, the method is the same as Example 1, except that the soluble carbonate in step (1) is selected from sodium carbonate, and the addition amount of fluorine-phosphorus composite additive in step (2) is: 1870 grams of ammonium fluoride, 920 grams of pyrophosphoric acid, 640 liters of pure water was prepared as a solution.

[0031] Test results: the amount of erosion is 11.71 um, the surface finish is 6 angstroms, and there is no scratch on the surface.

Embodiment 3

[0032] Example 3, the method is the same as in Example 1, except that the soluble carbonate in step (1) is selected from potassium carbonate, and the addition amount of fluorine-phosphorus composite additive in step (2) is: 1250 grams of ammonium bifluoride, 920 grams of polyphosphoric acid, pure 1130 liters of water was made into a solution.

[0033] Test results: the amount of erosion is 12.45 um, the surface finish is 6 angstroms, and there is no scratch on the surface.

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Abstract

The invention relates to a preparation method of rare-earth polishing powder containing fluorine and phosphorus, which is characterized by comprising the following steps: precipitating, treating with a fluorine-phosphorus composite additive, roasting, crushing and grading. The elements fluorine and phosphorus are simultaneously added in the synthesis process of the polishing powder precursor to effectively control the crystal form of the polishing powder, so that the polishing powder has certain crystal defects, thereby obtaining better polishing property, higher grinding capacity and higher surface accuracy.

Description

technical field [0001] The invention relates to a preparation method of rare earth polishing powder, which belongs to the field of preparation of rare earth compound products. Background technique [0002] Rare earth polishing powder has become the first choice for glass polishing materials because of its high polishing efficiency brought about by its unique chemical-mechanical action principle. It is widely used in lenses, optical components (lenses, prisms), color TV glass shells, electronic glass for flat panel displays, Polishing of silicon wafers, disk glass substrates and other products. With the rapid development of electronic information technology, higher requirements are put forward for the polishing rate and precision of rare earth polishing powder materials, which prompts manufacturers to continuously improve production grades to meet the requirements of new technologies and new products. [0003] Rare earth polishing powder is generally prepared by hydrometallu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/14
Inventor 萧昱刘建宁萧本华展玉红罗楠颂萧萍
Owner GANSU UNITED NEW RARE EARTH MATERIAL
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