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Method for purifying and synthesizing hexagonal boron nitride in synthetic cubic boron nitride tailings

A technology of cubic boron nitride and hexagonal boron nitride, which is applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve the problems of waste of hexagonal boron nitride tailings resources, etc., and achieve a fast and pollution-free purification method and improve Utilization, the effect of reducing potential threats

Inactive Publication Date: 2017-06-13
ZHENGZHOU ZHONGNAN JETE SUPERABRASIVES
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Problems solved by technology

[0004] The invention provides a method for purifying hexagonal boron nitride in the tailings of synthetic cubic boron nitride, which solves the problem of waste of resources in which hexagonal boron nitride tailings are discarded by recovering and purifying the tailings

Method used

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Embodiment 1

[0020] The recovery of hexagonal boron nitride in the tailings of synthetic cubic boron nitride (CBN120), cubic boron nitride (CBN120) is a cubic boron nitride product, the catalyst used is a lithium-based system, and there will be lithium oxide in the impurities.

[0021] A method for purifying hexagonal boron nitride in the synthesis of cubic boron nitride tailings, characterized in that, it is realized through the following steps:

[0022] Step 1: Collect the tailings, collect the tailings in the shaking table light mining area where cubic boron nitride (CBN120) is processed in the shaking table process, after dehydration by the centrifuge, put it into a plastic box according to 10kg as a standard unit, and collect 50kg of tailings For materials, 30kg will be processed at one time, and the remaining 20kg will be combined into the next batch for processing.

[0023] Step 2: Ball mill and sieve, clean the stirring ball mill, put 40kg of 8~16mm mixed steel balls, and mix accor...

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Abstract

The invention belongs to the field of synthesis of cubic boron nitride and in particular relates to a method for purifying and synthesizing hexagonal boron nitride in synthetic cubic boron nitride tailings. The method for purifying and synthesizing the hexagonal boron nitride in the synthetic cubic boron nitride tailings is characterized by being realized through the following steps: carrying out ball milling and thinningrefining; shaking to remove one part of impurities; drying at low temperature; conveying materials into a furnace body of continuous tunnel type microwave drying equipment; meanwhile, introducing mixed gas of oxygen and air into the furnace body, so as to remove carbon impurities; removing the residual impurities through diluted acid; adding the materials, the diluted acid and pure water into a reaction kettle and stirring and heating; after sufficiently reacting, obtaining materials without the impurities; washing with the pure water; neutralizing and washing with the pure water to obtain the pure hexagonal boron nitride. According to the method provided by the invention, a solid waste material, namely the hexagonal boron nitride, is purified to obtain a useful material through physical and chemical methods, so that the utilization of the raw material is greatly improved, and potential threats, caused by the solid waste material, on to the environment are also reduced.

Description

technical field [0001] The invention belongs to the field of cubic boron nitride synthesis, and in particular relates to a method for purifying hexagonal boron nitride in tailings of synthetic cubic boron nitride. Background technique [0002] Hexagonal boron nitride is an inorganic non-metallic material that does not exist in nature and is artificially synthesized. Known as white graphite, it has a graphite-like layered structure, good lubricity, excellent electrical insulation, high thermal conductivity, low thermal expansion, and excellent chemical stability. The chemical properties are stable and chemically inert to all molten metals. The formed products are easy to machine and have high corrosion resistance. Hexagonal boron nitride has a wide range of uses. Because of its excellent chemical stability and neither wetting nor reaction to most metal melts, it can be used as a high-temperature galvanic protection sleeve, a crucible and a vessel for melting metals. , pipel...

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 张相法刘云飞鲁翠莲
Owner ZHENGZHOU ZHONGNAN JETE SUPERABRASIVES
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