Artificial diamond purification technique

A technology of artificial diamond and process method, which is applied in the field of synthesis and purification of superhard materials, can solve problems such as production environment and atmospheric environment pollution, poisoning of human health, and operator hazards, and achieve the goals of reducing labor consumption, eliminating pollution, and improving safety Effect

Inactive Publication Date: 2007-10-31
ZHONGNAN DIAMOND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. The metal and strong acid contained in the diamond synthesis block are easy to form surface passivation during the reaction process, which requires more than ten repeated cycle operations such as reaction → ball milling → elutriation → reaction, which is labor-intensive, time-consuming, and material-intensive
[0004] 2. Impurities such as graphite contained in the diamond synthesis block are also removed through the oxidation reaction of nitric-sulfur mixed acid, therefore, a large amount of concentrated nitric acid and concentrated sulfuric acid are required to be consumed
[0005] 3

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] According to the above-mentioned synthetic diamond purification process, the synthetic diamond block is first broken into small particles, put into a reaction kettle, add 10% concentration of sulfuric acid or nitric acid or hydrochloric acid aqueous solution, and react at room temperature for 48 hours to remove metals. Then take out the reaction materials, go through ball milling, elutriation to remove graphite, dry and then sieve to get the finished diamond product.

Embodiment 2

[0020] According to the above-mentioned synthetic diamond purification process, the synthetic diamond block is first broken into small particles, put into a reaction kettle, add 15% concentration of sulfuric acid or nitric acid or hydrochloric acid aqueous solution, and react at room temperature for 42 hours to remove metals. Then take out the reaction materials, go through ball milling, elutriation to remove graphite, dry and then sieve to get the finished diamond product.

Embodiment 3

[0022] According to the above-mentioned synthetic diamond purification process, the synthetic diamond block is first broken into small particles, put into a reaction kettle, add 20% concentration of sulfuric acid or nitric acid or hydrochloric acid aqueous solution, and react at room temperature for 40 hours to remove metal. Then take out the reaction materials, go through ball milling, elutriation to remove graphite, dry and then sieve to get the finished diamond product.

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PUM

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Abstract

The invention discloses a process to purify diamond, which comprises the following steps: grinding diamond synthesized block into particles; putting into autoclave; adding into the water solution of sulfuric acid or azotic acid or alcaine with density at 10-20%; reacting at normal temperature for 36-48 h; stripping metal; balling; sluicing; clearing black lead; drying; getting the purified diamond. This method does not use concentrated nitric sulfuric mixed acid and can eliminate a good deal of yellow acid mist, which can improve the safety in industrial process.

Description

technical field [0001] The invention belongs to the technical field of superhard material synthesis and purification, and relates to a synthetic diamond purification process. Background technique [0002] In the known technology, for the purification of superhard materials such as diamond block or cubic boron nitride synthesized by powder method, a high concentration nitric acid mixed acid reaction method is generally used, and the strong oxidizing property of nitric acid mixed acid is used to combine with the metal in the superhard material. React with impurities such as graphite to achieve the purpose of impurity removal and purification. There are following problems in this process method: [0003] 1. The metal contained in the diamond synthesis block and the strong acid are easy to form surface passivation during the reaction process, which requires more than ten repeated cycle operations such as reaction → ball milling → elutriation → reaction, which is labor-intensive...

Claims

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Application Information

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IPC IPC(8): C01B31/06
Inventor 刘善跃刘杰李玉健沈远李璞
Owner ZHONGNAN DIAMOND CO LTD
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