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Roasting process of lanthanum-cerium oxide rear-earth polishing powder

A rare earth polishing powder, lanthanum cerium oxide technology, applied in the fields of rare earth metal compounds, inorganic chemistry, chemical instruments and methods, etc., can solve the problem of no more detailed optimization and research, unfavorable economic and social benefits, and low overall added value. and other problems, to achieve the effect of good product technical indicators, high hardness and high added value

Inactive Publication Date: 2013-08-21
郭尧
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Rare earth polishing powder is currently used in many fields of national industry, such as optical glass, liquid crystal devices, integrated circuits and other industries and enterprises. At present, rare earth polishing powder is especially represented by cerium oxide and lanthanum cerium oxide. In practical applications, the main technical indicators of polishing powder are divided into two categories: one is the cutting rate of the polishing powder on the polished body, and the other is the scratch degree of the polishing powder on the surface of the polished piece. Products with high cutting force are easy to cause scratches, while polishing powder with small scratches has low cutting force. These two indicators are contradictory to each other. The balance between the two is very important. The quality of cutting force depends on the polishing powder crystal at high Temperature and time during calcination, the higher the temperature, the higher the crystal hardness, the higher the cutting force, the formation of the scratch depth is related to the shape of the polished crystal, and the spherical shape is recognized as the best shape, so the calcination temperature process of the polishing powder is the same as that of the polishing powder The quality of performance has a lot to do with it. At present, the high-temperature calcination temperature of domestic polishing powder is mostly around 1000°C. There has not been more detailed optimization and research on the calcination temperature curve. Although the main technical indicators of the prepared polishing powder can be It meets a certain level of demand, but there is still a certain gap compared with the performance indicators of high-end products, and the overall added value is low, which is not conducive to achieving greater economic and social benefits

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Lanthanum cerium carbonate rare earth is used as the raw material, the total content of rare earth oxides in the raw material is more than 45%, and cerium oxide accounts for more than 60% of the total rare earth oxide content, and the particle size of the material after adding deionized water and grinding in a ball mill is D50=0.8-0.95 um , you can add 4% of the total weight of rare earth oxides in hydrofluoric acid for fluorination, or not, filter and dry, put the dried material in an electric furnace, and raise the temperature from room temperature to 760°C within 100 minutes. Then raise the temperature to 970°C for 80 minutes, keep the temperature at 970°C±10°C for 180 minutes, then raise the temperature from 970°C to 1090°C within 40 minutes, keep the temperature at 1090°C±5°C for 210 minutes, then Calcination was completed by reducing the temperature from 1090°C to 100°C within 30 minutes.

Embodiment 2

[0035] Lanthanum cerium carbonate rare earth is used as the raw material, the total content of rare earth oxides in the raw material is more than 45%, and cerium oxide accounts for more than 60% of the total rare earth oxide content, and the particle size of the material after adding deionized water and grinding in a ball mill is D50=0.8-0.95 um , You can add 4% of the total weight of rare earth oxides in hydrofluoric acid for fluorination, or not, filter and dry, put the dried material in an electric furnace, and raise the temperature from room temperature to 750°C within 100 minutes. Then raise the temperature to 970°C for 90 minutes, keep the temperature within 970°C±10°C for 200 minutes, then raise the temperature from 970°C to 1090°C within 45 minutes, keep the temperature within 1090°C±5°C for 190 minutes, then Calcination was completed by reducing the temperature from 1090°C to 80°C within 30 minutes.

Embodiment 3

[0037] Lanthanum cerium carbonate rare earth is used as the raw material, the total content of rare earth oxides in the raw material is more than 45%, and cerium oxide accounts for more than 60% of the total rare earth oxide content, and the particle size of the material after adding deionized water and grinding in a ball mill is D50=0.8-0.95 um , you can add 4% of the total weight of rare earth oxides in hydrofluoric acid for fluorination, or not, filter and dry, put the dried material in an electric furnace, and raise the temperature from room temperature to 790°C within 100 minutes. Then raise the temperature to 970°C for 90 minutes, keep the temperature at 970°C±10°C for 200 minutes, then raise the temperature from 970°C to 1090°C within 50 minutes, keep the temperature at 1090°C±5°C for 210 minutes, then Calcination was completed by reducing the temperature from 1090°C to 100°C within 25 minutes.

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PUM

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Abstract

The invention discloses a roasting process of lanthanum-cerium oxide rear-earth polishing powder, which belongs to the chemical field. The roasting process comprises the following temperature courses in sequence: (a), a first heat-up stage, wherein the temperature is increased to 970 DEG C from the room temperature within 180 minutes-210 minutes; (b), a first constant-temperature stage, wherein the temperature is kept within 970 DEG C+ / - 5 DEG C for 150 minutes-180 minutes; (c), a second heat-up stage, wherein the temperature is increased to 1090 DEG C from 970 DEG C within 30 minutes-60 minutes; (d), a second constant-temperature stage, wherein the temperature is kept within 1090 DEG C+ / -5 DEG C for 180 minutes-240 minutes; and (e), a cool-down stage, wherein the temperature is reduced to 60 DEG C-100 DEG C from 1090 DEG C within 20 minutes-40 minutes. The polishing powder manufactured by the roasting process is high in cutting rate, small in scratching depth to a ground object and low in proportion.

Description

technical field [0001] The invention relates to a calcination process of polishing powder, in particular to a calcination process of rare earth polishing powder, belonging to the field of chemistry Background technique [0002] Rare earth polishing powder is currently used in many fields of national industry, such as optical glass, liquid crystal devices, integrated circuits and other industries and enterprises. At present, rare earth polishing powder is especially represented by cerium oxide and lanthanum cerium oxide. In practical applications, the main technical indicators of polishing powder are divided into two categories: one is the cutting rate of the polishing powder on the polished body, and the other is the scratch degree of the polishing powder on the surface of the polished piece. Products with high cutting force are easy to cause scratches, while polishing powder with small scratches has low cutting force. These two indicators are contradictory to each other. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00
Inventor 郭尧郭栋周玉林
Owner 郭尧
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