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Pollution-free gas-phase oxidation separation purification method for artificial diamond

A synthetic diamond, gas-phase oxidation technology, applied in chemical instruments and methods, solid separation, wet separation, etc., can solve problems such as environmental pollution of synthetic diamond powder, avoid harsh working conditions and serious environmental pollution, save raw materials, The effect of post-processing simplification

Inactive Publication Date: 2003-03-26
ZHONGBEI UNIV
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  • Abstract
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Problems solved by technology

[0003] The invention effectively solves the serious environmental pollution problem in the post-treatment production process of artificial diamond powder

Method used

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  • Pollution-free gas-phase oxidation separation purification method for artificial diamond
  • Pollution-free gas-phase oxidation separation purification method for artificial diamond

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Embodiment Construction

[0025] Adopt the step of processing method of the present invention to produce artificial diamond as follows:

[0026] The first step is primary crushing, using mechanical crushing methods to crush the synthetic rods into fine particles, such as jaw crushers or roller crushers. The fine particle diameter is preferably 3-5mm.

[0027] The second step: the pyrolysis process, using the high-temperature sintering method based on the principle of gas phase oxidation to pyrolyze the fine particles. Strictly control the pyrolysis temperature of 450°C-650°C, and use water vapor and inert gas for protection.

[0028] The third step: crushing and dissociation process, which further crushes and dissociates the fine particles treated by high temperature oxidation. Use mechanical rolling and rubbing as much as possible, such as ball milling. Strictly control the strength and add dielectric protection to prevent damage to the diamond single crystal.

[0029] The fourth step: Separation ...

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Abstract

The artificial diamond pollutionless separation purification gas phase oxidation separation method includes the following steps: 1. primary breaking, adopting mechanical breaking mode, breaking synthetic rod into fine granules, grain diameter is less than 5 mm; 2. pyrolytic process, its temperature is controlled at below 650 deg.C, using aqueous vapor and inert gas to make protection; 3. crushing dissociation process; 4. separation purification process, adopting screening, magnetic separation, heavy liquid separation and chemical oxidation combined mode to separate diamond granules from mixture and making purification; 5. granules grading process, according to the grain size dividing the diamond granules into different grades.

Description

Technical field: [0001] The invention belongs to the technical field of post-treatment of artificially synthesized diamonds, in particular to a pollution-free separation and purification process of artificial diamonds—a gas-phase oxidation separation method. Background technique: [0002] Due to its wide use in the abrasive processing industry, diamond powder has a huge market demand. The research on diamond synthesis technology has always received great attention, and the technology has developed rapidly. However, the separation and purification method as its subsequent treatment technology is rarely carried out. At present, the production process of artificial diamond at home and abroad still mainly adopts the traditional chemical method for its post-treatment process. Production material)→cleaning→grinding and dissociation→shaker gravity separation to remove graphite→acid treatment to remove graphite→cleaning and drying→alkaline treatment to remove pyrophyllite→cleaning ...

Claims

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Application Information

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IPC IPC(8): B01J3/06B02C23/08B03B5/30
Inventor 王晶禹张景林李宝成徐文峥王保国
Owner ZHONGBEI UNIV
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