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Diamond purification method

A diamond and graphite technology, applied in the field of diamond production, can solve the problems of deteriorating production environment, generation of acid waste water, tail gas, high cost of waste water treatment, etc., and achieve the effects of reducing labor intensity, optimizing the environment and reducing production cost input

Inactive Publication Date: 2016-11-09
ANQING KAILI DIAMOND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of this method are: a large amount of high-concentration strong acid is used, a large amount of sulfuric acid fume and NOx gas are generated during impurity removal and purification, and acid waste water is produced at the same time, which deteriorates the production environment and the cost of tail gas and waste water treatment is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1 A method for purifying diamond. Put the mixture of diamond and graphite in an industrial microwave oven, add magnesium carbonate and stir well at the same time. The calcination temperature is 300-600°C, and the calcination time is 60min-80min. Then cool to room temperature and send Put into shaking table to separate diamond, the consumption of described magnesium carbonate is 8% of the quality of diamond and graphite mixed material. It is measured that the purity of the diamond in this embodiment is 99.95%.

Embodiment 2

[0013] Example 2 A method for purifying diamond. Put the mixture of diamond and graphite in an industrial microwave oven, add magnesium carbonate and stir evenly. The calcination temperature is 300-600°C, and the calcination time is 60min-80min, then cooled to room temperature, sent The diamond is separated into a shaking table, and the consumption of the magnesium carbonate is 10% of the quality of the diamond and graphite mixed material. It is measured that the purity of the diamond in this embodiment is 99.97%.

Embodiment 3

[0014] Example 3 A method for purifying diamond. Put the mixture of diamond and graphite in an industrial microwave oven, add magnesium carbonate and stir well at the same time. The calcination temperature is 300-600°C, and the calcination time is 60min-80min, then cooled to room temperature, sent Put into the shaker and separate diamond, the consumption of described magnesium carbonate is 12% of the mass of diamond and graphite mixed material, and the purity of the diamond of the present embodiment is measured as 99.94%.

[0015] The principle of the present invention is that after the mixture of magnesium carbonate, diamond and graphite is evenly mixed, the magnesium carbonate adheres and penetrates into the interior of the graphite particles. During high temperature treatment, the magnesium carbonate decomposes to release carbon dioxide, and the carbon dioxide produced rapidly causes the inclusion graphite particles to deform and become deformed. It is loose and porous, and ...

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PUM

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Abstract

The invention discloses a diamond purification method. The method comprises the following steps: placing a diamond and graphite mixture in an industrial microwave oven, adding calcium carbonate, uniformly stirring the diamond and graphite mixture and calcium carbonate, roasting the stirred mixture at 300-600 DEG C for 60-80 min, cooling the roasted mixture to normal temperature, sending the cooled roasted mixture to a shaking table, and separating diamond. The method reduces a large amount of production cost investment, effectively improves the operating environment of workers, reduces the labor intensity, beautifies environment, and avoids a large amount of tail gas and wastewater treatment cost.

Description

technical field [0001] The invention relates to the technical field of diamond production, in particular to a method for purifying diamond. Background technique [0002] In the superhard material industry, synthetic diamonds are mostly synthesized by powder catalyst core column technology, high temperature and high pressure, and part of the graphite in the synthetic core column is transformed into diamond under the action of powder catalyst. In the post-processing and purification process of diamond, after the catalyst metal is extracted from the powder catalyst diamond synthesis pellet by electrochemical process, the obtained material is a mixture of diamond and graphite, and then enters the key step of diamond purification - the separation of diamond and graphite. In the known purification technology of artificially synthesized superhard materials, according to the density difference between diamond and graphite, the rough purification of diamond is completed by mineral pr...

Claims

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Application Information

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IPC IPC(8): C01B31/06
CPCC01P2006/80
Inventor 李凯
Owner ANQING KAILI DIAMOND TECH