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Process for recovery and purification of hexagonal boron nitride in cubic boron nitride synthetic tailings

A technology of hexagonal boron nitride and cubic boron nitride, which is applied in nitrogen compounds, inorganic chemistry, chemical instruments and methods, etc., can solve problems such as waste and loss, and achieve low investment and consumption of process equipment, high economic return, and process The effect of simple steps

Inactive Publication Date: 2012-11-14
ZHENGZHOU ZHONGNAN JETE SUPERABRASIVES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing post-treatment purification process, this part of unconverted hexagonal boron nitride, metal catalyst and carbon and other impurities are lost in the light mine area with water in the process of shaking table separation and extraction of cubic boron nitride. , resulting in wasted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] First, collect the hexagonal boron nitride slurry in the shaker light mining area; then use a centrifuge to filter and dehydrate the hexagonal boron nitride slurry, and then dry it at 120°C; then put it into a ball mill with a ball-to-material ratio of 4:1 for 4 hours , refine the material; then put the ball-milled material into a muffle furnace and roast at 1200 ° C for 4 hours to burn off carbon impurities; put the material obtained through high-temperature roasting into the reaction kettle, and then add 10% sulfuric acid solution , the weight ratio of the material to the acid solution is 1:4, react at a temperature of 100°C for 16 hours, discharge the waste liquid from the reactor and store it for secondary use, take out the reaction material and wash it several times with clear water until it is neutral; finally, put The cleaned material is put into an oven and dried at 120°C to obtain the final product of hexagonal boron nitride with a purity of 96%.

Embodiment 2

[0029] First, collect the hexagonal boron nitride slurry in the shaker light mining area; then use a centrifuge to filter and dehydrate the hexagonal boron nitride slurry, and then dry it at 120°C; then put it into a ball mill with a ball-to-material ratio of 4:1 for 4 hours , refine the material; then put the ball-milled material into a muffle furnace and roast at 1200°C for 4 hours to burn off carbon impurities; put the material obtained through high-temperature roasting into the reaction kettle, and then add 15% concentration of hydrochloric acid solution , the weight ratio of the material to the acid solution is 1:4, react at a temperature of 100°C for 14 hours, discharge the waste liquid from the reactor and store it for secondary use, take out the reaction material and wash it several times with clear water to neutrality; finally, put The cleaned material is put into an oven and dried at 120°C to obtain the final product of hexagonal boron nitride with a purity of 96.5%. ...

Embodiment 3

[0031] First, collect the hexagonal boron nitride slurry in the shaker light mining area; then use a centrifuge to filter and dehydrate the hexagonal boron nitride slurry, and then dry it at 120°C; then put it into a ball mill with a ball-to-material ratio of 4:1 for 4 hours , to refine the material; then put the ball-milled material into a muffle furnace and roast it at 1200°C for 4 hours to burn off carbon impurities; put the material obtained through high-temperature roasting into the reaction kettle, and then add 20% sulfuric acid solution , the weight ratio of the material to the acid solution is 1:4, react at a temperature of 100°C for 12 hours, discharge the waste liquid from the reactor and store it for secondary use, take out the reaction material and wash it several times with clear water to neutrality; finally, put The washed material is put into an oven and dried at 120°C to obtain the final product of hexagonal boron nitride with a purity of 97%.

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Abstract

The invention discloses a process for recovery and purification of hexagonal boron nitride in cubic boron nitride synthetic tailings. The process includes steps: a, collecting raw materials; b, drying the raw materials; c, ball milling; d, roasting; e, removing metals; f, elutriating; and g, drying. The process is convenient, easy to implement, reduced in waste and improved in economic benefit. The cubic boron nitride synthetic tailings are used, the process which is rational and easy to implement is adopted to recover and purify the hexagonal boron nitride, process parameters reach the optimum, process steps are concise, investment and consumption of process equipment are small, and the purity of recovered and purified hexagonal boron nitride is higher and reaches more than 96%, so that the process for recovery and purification of the hexagonal boron nitride in the cubic boron nitride synthetic tailings has higher economic returns.

Description

technical field [0001] The invention relates to the technical field of cubic boron nitride synthesis and production, in particular to a process for recovering and purifying hexagonal boron nitride in cubic boron nitride synthesis tailings. Background technique [0002] At present, industrially synthesized cubic boron nitride is synthesized by using hexagonal boron nitride as a raw material under high temperature and high pressure with the participation of alkali metal or alkaline earth metal catalysts. In this process, the conversion rate of hexagonal boron nitride is generally less than 60%, and pure cubic boron nitride is obtained after removing hexagonal boron nitride, metal catalysts and other impurities through post-treatment. In the existing post-treatment purification process, this part of unconverted hexagonal boron nitride, metal catalyst and carbon and other impurities are lost in the light mine area with water in the process of shaking table separation and extract...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/064
Inventor 张相法梁浩孟令强刘云飞
Owner ZHENGZHOU ZHONGNAN JETE SUPERABRASIVES
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