Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of cubic boron nitride purification treatment method

A cubic boron nitride and treatment method technology, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve problems such as acid gas pollution, low production efficiency, and large acid and alkali consumption, and achieve control of pollution emissions, Effect of improving production efficiency and reducing purification cost

Active Publication Date: 2020-11-24
ZHENGZHOU ZHONGNAN JETE SUPERABRASIVES
View PDF8 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com