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Method for purifying diamond concentrates through microwave oxidizing roasting

A technology of oxidation roasting and diamond, which is applied in the chemical/physical/physicochemical process of applying energy, etc.

Inactive Publication Date: 2012-03-21
CHANGSHA SYNO THERM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method for purifying diamond concentrate by microwave oxidation roasting to reduce the emission of harmful gases and environmental pollution and improve the working environment in view of the deficiencies in the existing diamond purification technology. The purpose of reducing pollution control and production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Put 200g of the 40 / 45 mesh diamond composite material after removing the metal catalyst into an industrial intermittent microwave sintering furnace, pass in air, the oxidation temperature is 650 degrees, the oxidation time is 60min, and the temperature is measured by an infrared thermometer. The processed material is boiled with soda, dried, and inspected under a microscope. No impurities are found in the diamond, and the color is bright.

Embodiment 2

[0017] Put 100g of 100 / 140 mesh diamond micropowder into an industrial intermittent microwave sintering furnace in an oxygen atmosphere, the temperature is 400 degrees, the oxidation time is 20min, and the temperature is measured by an infrared thermometer. The processed material is boiled with soda, dried, and inspected under a microscope. No impurities are found in the diamond, and the color is bright.

Embodiment 3

[0019] 200kg230 / 270mesh diamond micropowder was divided into saggers and put into an industrial continuous microwave push plate furnace. The mixed atmosphere of nitrogen and air was at a temperature of 300 degrees, and the oxidation time was 120 minutes. The temperature was measured by a thermocouple. The processed material is boiled with soda, dried, and inspected under a microscope. No impurities are found in the diamond, and the color is bright.

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PUM

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Abstract

The invention discloses a method for purifying diamond concentrates through microwave oxidizing roasting. In the method, the diamond concentrates are placed in an industrial microwave oven and subjected to oxidizing roasting in an oxidizing atmosphere for 20-120min at the roasting temperature of 300-650 DEG C, and residual graphite and amorphous carbon on surfaces of diamond and free residual graphite and amorphous carbon are removed through microwave oxidizing roasting, so that the purpose of purifying the diamond concentrates is achieved. In the invention, according to the characteristics of selective microwave heating, integral microwave heating and accelerated chemical reaction, the differences in wave absorption capacities of the graphite, the amorphous carbon and the diamond under a microwave field are utilized to rapidly oxidize the residual graphite in the diamond at the diamond oxidization temperature, meanwhile, the molecular structure of the diamond is not destroyed. Therefore, the method disclosed by the invention has many advantages of environment friendliness, simple procedures, high efficiency, reduced cost and the like.

Description

technical field [0001] The invention belongs to the technical field of post-treatment of artificially synthesized diamonds, in particular to a method for purifying diamond concentrates by microwave oxidation roasting. Background technique [0002] As a superhard material, artificial diamond has the characteristics of high hardness, good wear resistance, corrosion resistance, high thermal conductivity, and good light transmission. It is widely used in industry, science and technology, national defense, medical and health and other fields. Diamond synthesized under high temperature and high pressure needs to be purified and classified before it can be used in different fields, and the cost of purification accounts for most of the cost of diamond. At present, the production process of synthetic diamond at home and abroad mainly adopts chemical methods in the follow-up process. The process method is: diamond synthetic rod→mechanical crushing→electrolytic removal of metal catalys...

Claims

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Application Information

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IPC IPC(8): C01B31/06B01J19/12
Inventor 杨军张晓东王雄
Owner CHANGSHA SYNO THERM
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