Purification method for artificial diamond

A synthetic diamond and purification method technology, applied in the field of synthetic diamond purification, can solve the problems of health hazards for operators, generation of harmful gases and acid mist, serious environmental pollution, etc., so as to reduce the generation of harmful gases, ensure physical health, The effect of simplifying the purification process

Inactive Publication Date: 2017-01-04
江苏益林金刚石工具有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned process is a traditional chemical method, using a variety of highly corrosive acid and alkali solutions. During the operation, a large amount of harmful gas and acid mist will be generated, which will seriously pollute the environment, and poor working conditions will also affect the operators. health hazards
In order to solve environmental pollution and improve treatment efficiency, researchers at home and abroad have carried out various researches, developed and practiced a new process of purifying diamond by gas phase oxidation, but a small amount of acid solution is still used for chemical oxidation treatment in the new process , and using heavy liquid for separation, these small amounts of acid liquid and heavy liquid are still easy to pollute the environment and need to be discharged after post-treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for purifying artificial diamond, comprising the steps of:

[0018] Step 1. Mechanical crushing: In the synthetic diamond rod, the synthetic diamond, graphite, catalyst metal, and a small amount of pyrophyllite are closely mixed together, and the synthetic rod must be mechanically crushed, and the synthetic diamond rod is crushed by jaw type Machine crushed into fine particles, the diameter of fine particles is 2mm;

[0019] Step 2. Sintering oxidation: Based on the principle of gas phase oxidation, the fine particles in step 1 are sintered and oxidized at high temperature with oxygen in the air as the oxidant. The sintering temperature is 650°C, and the sintering time is 30 minutes. Part of the graphite, while using nitrogen to protect the artificial diamond contained in the fine particles, and cooling to room temperature to obtain material A; the thermal stability of artificial diamond and graphite in the air is different, that is, the initial oxidation tempe...

Embodiment 2

[0024] A method for purifying artificial diamond, comprising the steps of:

[0025] Step 1. Mechanical crushing: In the synthetic diamond rod, the synthetic diamond, graphite, catalyst metal, and a small amount of pyrophyllite are closely mixed together, and the synthetic rod must be mechanically crushed, and the synthetic diamond rod is crushed by jaw type Machine crushed into fine particles, the diameter of fine particles is 5mm;

[0026] Step 2. Sintering oxidation: Based on the principle of gas phase oxidation, the fine particles in step 1 are sintered and oxidized at high temperature with oxygen in the air as the oxidant. The sintering temperature is 550°C and the sintering time is 60 minutes. Part of the graphite, while using nitrogen to protect the artificial diamond contained in the fine particles, and cooling to room temperature to obtain material A; the thermal stability of artificial diamond and graphite in the air is different, that is, the initial oxidation temper...

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Abstract

The invention discloses a purification method for artificial diamond. The purification method comprises the following concrete steps: 1, mechanical crushing: mechanically crushing an artificial diamond synthetic rod into fine grains; 2, sintering and oxidation: removing most graphite by using a gas phase oxidation process; 3, crushing and dissociation: recovering catalyst metal by using a magnetic process and carrying out shaking-table sorting of a part of pyrophyllite; 4, separation and purification: totally remove residual graphite by using a flotation process and removing residual pyrophyllite by using a water elutriation method; and 5, drying and sorting: carrying out drying and sorting to obtain artificial diamond of different grades. The purification method has the advantages that purification process is simplified; severe pollution of a strong acid solution used in traditional purification processes to environment is mitigated; environmental protection is realized; and generation of harmful gas in the process of purification is reduced, so the working environment of operators is improved and the health of the workers is guaranteed.

Description

technical field [0001] The invention relates to the technical field of synthesis and purification of superhard materials, in particular to a method for purification of artificial diamond. Background technique [0002] Diamond has the highest hardness, excellent wear resistance and chemical stability, etc., and it has a wide range of applications in the fields of electronics, mechanics and optics. At present, artificial diamond is mostly used in industry. Artificial diamond is synthesized by using graphite and catalytic metal under high temperature and high pressure. The synthetic rod is a columnar dense mixture composed of diamond, graphite, catalytic metal and a small amount of pyrophyllite. Therefore, to obtain pure diamond, it must be purified. [0003] At present, the known artificial diamond purification process is acid-dissolving or electrolytic removal of alloy and dissociation of diamond → manual kneading and refinement → screening to remove coarse particles → manua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/06
Inventor 吴益易宏峰
Owner 江苏益林金刚石工具有限公司
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