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A samarium-containing rare earth polishing powder and its preparation process

A rare earth polishing powder and preparation process technology, applied in polishing compositions containing abrasives, etc., can solve the problems of low value of samarium element, overstocked resources, inability to form market sales, etc., and achieve a wide source of raw materials, little pollution, and good grinding The effect of efficiency and recycling performance

Active Publication Date: 2020-05-19
甘肃稀土新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low-purity samarium elements are not only low in value but also unable to form market sales, resulting in a large backlog of resources

Method used

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  • A samarium-containing rare earth polishing powder and its preparation process
  • A samarium-containing rare earth polishing powder and its preparation process
  • A samarium-containing rare earth polishing powder and its preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The rare earth compound is prepared as a salt solution, and the composition of the salt solution is calculated as Sm in molar ratio 2 o 3 / TREO=1.4×10 -4 , La 2 o 3 / TREO=0.104,Pr 7 o 11 / TREO=0.0022,Nd 2 o 3 / TREO=0.0045, the balance is CeO 2 / TREO=0.36, the molar concentration of the salt solution is 0.59mol / L. Add 1m into the reaction vessel 3 The raw material solution was heated up to 96°C. Ammonium bicarbonate is prepared as a solution of 0.885 mol / L, and ammonium fluoride is added to the ammonium bicarbonate solution so that the fluoride ion concentration in the ammonium bicarbonate solution is 0.236 mol / L. Press filter the fluorine-containing ammonium bicarbonate solution, and take the clear liquid. Add fluorine-containing ammonium bicarbonate solution into the reactor until the pH value of the system is 7.0, and the synthesis process control time is 5 hours. The precipitate was washed and filtered, dried at 300°C for 36 hours, and the dried material ...

Embodiment 2

[0029] The rare earth compound is prepared as a salt solution, and the composition of the salt solution is calculated as Sm in molar ratio 2 o 3 / TREO=0.014, La 2 o 3 / TREO=0.104,Pr 7 o 11 / TREO=8.6×10 -6 ,Nd 2 o 3 / TREO=2.97×10 -4 , the balance is CeO 2 / TREO=0.28, the molar concentration of the salt solution is 1.78mol / L. Add 1m into the reaction vessel 3 The raw material solution was heated up to 90°C. Ammonium bicarbonate is prepared as a solution of 2.67 mol / L, and ammonium fluoride is added to the ammonium bicarbonate solution so that the fluoride ion concentration in the ammonium bicarbonate solution is 0.712 mol / L. Press filter the fluorine-containing ammonium bicarbonate solution, and take the clear liquid. Add fluorine-containing ammonium bicarbonate solution into the reactor until the pH value of the system is 7.0, and the synthesis process control time is 0.5 hour. The precipitate was washed and filtered, dried at 650°C for 6 hours, and the dried mater...

Embodiment 3

[0031] The rare earth compound is prepared as a salt solution, and the composition of the salt solution is calculated as Sm in molar ratio 2 o 3 / TREO=0.014, La 2 o 3 / TREO=0.06,Pr 7 o 11 / TREO=0.0022,Nd 2 o 3 / TREO=0.0045, balance CeO 2 / TREO=0.37, the molar concentration of the salt solution is 0.59mol / L. Add 1m into the reaction vessel 3The raw material solution was heated up to 93°C. Sodium carbonate is prepared as a 2.655mol / L solution, and sodium fluoride is added to the ammonium bicarbonate solution to make the fluoride ion concentration in the ammonium bicarbonate solution 0.59mol / L. Press filter the fluorine-containing ammonium bicarbonate solution, and take the clear liquid. Add fluorine-containing ammonium bicarbonate solution into the reactor until the pH value of the system is 7.0, and the synthesis process control time is 2.5 hours. The precipitate was washed and filtered, dried at 600°C for 12 hours, and the dried material was calcined at 1080°C for 8...

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Abstract

A samarium-containing rare earth polishing powder, the composition of which is calculated by molar ratio: Sm 2 o 3 / TREO=1.4×10 ‑4 ~0.014, La 2 o 3 / TREO=0.06~0.12, Pr 7 o 11 / TREO=8.6×10 ‑6 ~0.0047, Nd 2 o 3 / TREO=2.97×10 ‑5 ~0.0074, the balance is CeO 2 / TREO=0.27~0.46. The rare earth polishing powder uses samarium-containing rare earth salt solution as the main raw material, adds fluorine-containing precipitant solution to the raw material, controls the fluorine content in the product by adjusting the fluoride ion concentration in the precipitant, and then washes, dries and calcines , crushing and grading processes. The main difference between this process and other production processes is that samarium element is introduced into the rare earth raw material, and fluorine element is introduced into the precipitant, which has the advantages of simple preparation process and wide source of raw materials. The prepared rare earth polishing powder has uniform crystal grains, obvious edges and corners, and fast cutting speed.

Description

technical field [0001] The invention relates to the technical field of rare earth materials, in particular to a samarium-containing rare earth polishing powder and a preparation process thereof. Background technique [0002] Rare earth abrasives are widely used as abrasive materials for glass materials. Especially in recent years, the field of electrical and electronic equipment such as mobile phone glass, liquid crystal display (LCD), and photomask has grown rapidly, and the demand for polishing materials for their glass substrates has increased. With the continuous development of manufacturing technology in the industry, higher grinding speed and better surface accuracy are required for the grinding of substrates and other glass. At the same time, abrasive materials are required to have high recycling performance and reduce environmental problems that may be caused by fluorine. [0003] Patent CN201310403538.2 discloses a fluorine doping process using rare earth polishin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09G1/02
Inventor 李虎平魏其东姜霁涛史俊龙牛娟娟蒋春虎马相琴
Owner 甘肃稀土新材料股份有限公司
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