Method for purifying diamond or cubic boron nitride abrasive

A technology of cubic boron nitride and hexagonal boron nitride, which is applied in the fields of diamond, chemical instruments and methods, and nitrogen compounds, can solve the problems of low processing efficiency, high cost, and a large amount of space, so as to achieve full response, reduce labor costs, Power Saving Effect

Active Publication Date: 2013-04-17
FUNIK ULTRAHARD MATERIAL
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Problems solved by technology

[0002] At present, in the chemical purification process of superhard material manufacturers, for impurities such as pyrophyllite silicate, hexagonal boron nitride, and silicon oxide contained in the product, the traditional purification method uses stainless steel basins to mix the material with sodium hydroxide and potassium hydroxide. Heat the reaction w

Method used

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Effect test

Embodiment 1

[0010] The purification method of the present embodiment is as follows: 100 kilograms of cubic boron nitride plus 50 kilograms of sodium hydroxide and 25 kilograms of potassium hydroxide are put into the reactor and stirred, and the internal temperature and temperature are set by the temperature controller and the heating power controller. External process parameters, control the reaction process and reaction state, keep the internal temperature up to 130°C, turn off the heating system for 4 hours, release the product through the discharge port, and complete the dilution according to the conventional cleaning method. The total content of pyrophyllite silicate, hexagonal boron nitride and silicon oxide impurities is less than 0.1%.

Embodiment 2

[0012] The purification method of this embodiment is as follows: 110 kg of cubic boron nitride containing pyrophyllite silicate, hexagonal boron nitride, and silicon oxide plus 55 kg of sodium hydroxide and 27.5 kg of potassium hydroxide are put into the reaction kettle and stirred , set the internal and external process parameters through the temperature controller and heating power controller, control the reaction process and reaction state, keep the internal temperature up to 140 ℃, turn off the heating system for 3 hours, release the product through the discharge port, and follow the conventional cleaning method Dilution is complete. The total content of pyrophyllite silicate, hexagonal boron nitride and silicon oxide impurities is less than 0.1%.

Embodiment 3

[0014] The purification method of the present embodiment is: add 120 kilograms of cubic boron nitride containing pyrophyllite silicate, hexagonal boron nitride and silicon oxide to 60 kilograms of sodium hydroxide and 30 kilograms of potassium hydroxide, and put it into the reaction kettle for stirring. Set the internal and external process parameters through the temperature controller and heating power controller, control the reaction process and reaction state, keep the internal temperature up to 150°C, turn off the heating system in 2 hours, release the product through the discharge port, and complete it according to the conventional cleaning method Just dilute. The total content of pyrophyllite silicate, hexagonal boron nitride and silicon oxide impurities is less than 0.1%.

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Abstract

The invention relates to a method for purifying a diamond or cubic boron nitride abrasive. The method comprises the following steps: adding sodium hydroxide and potassium hydroxide to diamond or cubic boron nitride containing pyrophyllite silicate, hexagonal boron nitride and silicon oxide; stirring the sodium hydroxide and the potassium hydroxide as well as the diamond or cubic boron nitride for reaction; controlling an internal temperature at 130-150 DEG C and controlling an external temperature range at 240-250 DEG C; 2-4 hours later, closing a heating system; and discharging a product through a discharging product. Through the adoption of the method provided by the invention, product quality is absolutely guaranteed; in addition, uniformity is kept in stirring; a fact that purity reaches reaches requirements of purifying reaction consistency is guaranteed; impurities and incomplete reaction phenomenon are avoided; the sodium hydroxide and the potassium hydroxide are saved by 70 % according to process statistics; the comprehensive cost is reduced by 50 %; and very good promotion and application values are obtained.

Description

technical field [0001] The invention relates to a method for purifying diamond or cubic boron nitride abrasives. technical background [0002] At present, in the chemical purification process of superhard material manufacturers, for impurities such as pyrophyllite silicate, hexagonal boron nitride, and silicon oxide contained in the product, the traditional purification method uses stainless steel basins to mix the material with sodium hydroxide and potassium hydroxide. Heat the reaction with an electric furnace to form water-soluble salts and dilute with water to remove impurities, but the treatment efficiency is very low and the cost is high. It takes about 3 hours to consume 5 kWh of electricity per 10,000 carats of product , processing about 30,000 carats each time, if the output is too large, it will require a lot of space and manpower. Contents of the invention [0003] The object of the present invention is to provide a method for purifying diamond or cubic boron n...

Claims

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Application Information

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IPC IPC(8): C01B31/06C01B21/064C09K3/14C01B32/28
Inventor 李保中范林
Owner FUNIK ULTRAHARD MATERIAL
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