Technical method for electrorefining diamond

A process method and electrolytic purification technology, applied in the field of synthetic diamond synthesis and purification, can solve the problems of waste of resources, high cost of treatment, harm to operators, etc.

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

AI Technical Summary

Problems solved by technology

On the one hand, this process method is easy to form surface passivation during the reaction process between metal and strong acid, and it needs to carry out the repeated cycle operation process of more than ten processes such as reaction → ball milling → elutriation → reaction, which is labor-intensive, time-consuming, and material-intensive.
On the other hand, the graphite contained in the diamond synthesis block is also removed by the oxidation reaction of nitric acid mixed acid, thus, this method needs to consume a large amount of concentrated nitric acid and concentrated sulfuric acid
At the same time, this process method produces a large amount of yellow waste gas of nitri...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In the process of electrolytic purification of synthetic diamond according to the above-mentioned process, the batching amount of the electrolytic aqueous solution used can be: NiSO 4 or NiCL 2 100 g / ml, FeSO 4 or FeCL 2 5 g / ml, NaCl 5-10 g / ml, H 2 SO 4 5 g / ml.

Embodiment 2

[0028] In the process of electrolytic purification of synthetic diamond according to the above-mentioned process, the batching amount of the electrolytic aqueous solution used can also be: NiSO 4 or NiCL 2 150 g / ml, FeSO 4 or FeCL 2 20 g / ml, NaCl 7 g / ml, H 2 SO 4 7 g / ml.

Embodiment 3

[0030] In the process of electrolytic purification of synthetic diamond according to the above-mentioned process, the batching amount of the electrolytic aqueous solution used can also be: NiSO 4 or NiCL 2 200 g / ml, FeSO 4 or FeCL 2 40 g / ml, NaCl 10 g / ml, H 2 SO 4 10 g / ml.

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Abstract

This invention relates to a method for purifying diamond by electrolysis. The method comprises: immersing diamond synthesized by powder method into the electrolyte in an electrolytic tank as the anode, electrolyzing, precipitating metals in the synthetic diamond onto the cathode plate under current action, and removing graphite by washing with water to obtain high-purity diamond. The method utilizes electricity power as a substitute for H2SO4 and HNO3 thus can effectively eliminate environmental pollution during the purification process, and the operation is safe and reliable. Metals in the synthetic diamond can be recovered, and the recovery rate is 80-90%.

Description

technical field [0001] The invention belongs to the technical field of synthesis and purification of artificial diamond, in particular to an electrolytic purification diamond process method for synthesizing diamond by a powder method. Background technique [0002] In the known technology, for the purification of diamond blocks synthesized by powder method, the high-concentration nitric-sulfur mixed acid reaction method is generally used, and the strong oxidation of nitric-sulfur mixed acid is used to react with the metal and graphite in the diamond synthetic block to achieve the goal of impurity removal and purification. Purpose. On the one hand, this process method is easy to form surface passivation during the reaction process of metal and strong acid, and needs to carry out repeated cycles of more than ten processes such as reaction → ball milling → elutriation → reaction, which is labor-intensive, time-consuming, and material-intensive. On the other hand, the graphite c...

Claims

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Application Information

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IPC IPC(8): C01B31/06B01J3/06C25C1/24
CPCY02P10/20
Inventor 刘善跃刘杰李璞李玉健沈远
Owner ZHONGNAN DIAMOND CO LTD
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