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Method for purifying ad treating cubic boron nitride

A cubic boron nitride and processing method technology, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve the problems of acid gas pollution, large consumption of acid and alkali, low production efficiency, etc. The effect of reducing purification costs and improving production efficiency

Active Publication Date: 2019-10-22
ZHENGZHOU ZHONGNAN JETE SUPERABRASIVES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent document CN 103043632 B discloses a method for purifying diamond, cubic boron nitride abrasives or micropowder. This patent also uses high-concentration strong acid and strong alkali for purification, and the equipment used is strict. It also needs to collect and purify the treated tail gas Complex process and high cost
[0003] The above-mentioned purification method has great defects: (1) a large amount of strong alkali sodium hydroxide or potassium hydroxide is required, and a large amount of acid is required for subsequent neutralization, which consumes a large amount of acid and alkali, is prone to pollution and high production cost, and is easy to Causes damage and low production efficiency; (2) A large amount of concentrated acid is required to remove carbon and corrode dolomite by oxidation, which is easy to produce acid gas pollution and waste acid discharge pollution

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0024] In the present embodiment, the cBN fine material obtained through shaker sorting is passed through the first microwave tunnel kiln. 2 , heated at 600°C for 0.5 hours, oxidized to remove carbon, and converted hBN to B 2 o 3 ; Then through the second microwave tunnel kiln, pass H 2 Treatment, heating at 200°C for 4 hours to remove oxides and salts such as pyrophyllite and dolomite; after cooling the treated materials naturally, perform ultrasonic surface purification treatment at 28 KHz and 800W power for 20 minutes to remove adhered B 2 o 3 Wait for impurities and clean the surface; then wash with deionized water at 60°C; finally dry in a microwave oven to obtain pure cBN crystals.

Embodiment 2

[0026] In this embodiment, the cBN fine material obtained by shaking table sorting is passed through the first electrothermal tunnel kiln. 2 , heated at 700°C for 0.5 hours, oxidized to remove carbon, and converted hBN to B 2 o 3 ; Then through the second electric heating tunnel kiln, through H 2 Treatment, heating at 200°C for 4 hours to remove oxides and salts such as pyrophyllite and dolomite; after cooling the treated materials naturally, perform ultrasonic surface purification treatment at 28 KHz and 1000W power for 15 minutes to remove adhered B 2 o 3 Wait for impurities and clean the surface; then wash with 70°C deionized water; finally dry in a microwave oven to obtain pure cBN crystals.

Embodiment 3

[0028] In the present embodiment, the cBN fine material obtained through shaker sorting is passed through the first natural gas tunnel kiln. 2 , heated at 800°C for 1 hour, oxidized to remove carbon, and converted hBN to B 2 o 3 ; Then through the second natural gas tunnel kiln, through H 2 Treatment, heating at 400°C for 3 hours to remove oxides and salts such as pyrophyllite and dolomite; after cooling the treated materials naturally, perform ultrasonic surface purification treatment at 40 KHz and 2000W power for 15 minutes to remove adhered B 2 o 3 Wait for impurities and clean the surface; then wash with deionized water at 60°C; finally dry in a microwave oven to obtain pure cBN crystals.

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Abstract

The invention provides a method for purifying and treating cubic boron nitride, and belongs to the technical field of superhard material purification. The purification method is characterized in thatcBN concentrate by sorting a shaking table with a microwave tunnel furnace is oxidized by introducing O2 or air or an O2 and air mixed gas, and is reduced by introducing H2 in order to obtain purifiedcBN crystals, so strong acids and alkalis are avoided from being used in existing purification methods, the pollution of the purification process to the environment is reduced, and the purification cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of purification of superhard materials, in particular to a method for purification and treatment of cubic boron nitride single crystal. Background technique [0002] In the known technology, the industrial production of cubic boron nitride (cBN) usually uses hexagonal boron nitride (hBN) as raw material, and is synthesized under high temperature and high pressure with the participation of alkali metals, alkaline earth metals and their nitrides or ternary boron nitride. Yes, in addition to cBN, there are unconverted (30~50%) hBN, catalyst and a small amount of high-pressure cavity component materials (carbon, dolomite, pyrophyllite, etc.) in the obtained synthetic rod. The synthetic rod is soaked in water and shaken The cBN concentrate is sorted out, in which the cBN content is above 95%, and there are still residual hBN, pyrophyllite, dolomite, carbon, etc. After high-temperature alkali treatment, add 2-4 t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/064
CPCC01B21/0648C01P2006/80
Inventor 张相法王永凯位星张嘉琛鲁翠莲王大鹏刘红伟
Owner ZHENGZHOU ZHONGNAN JETE SUPERABRASIVES
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