Technical method for electrorefining diamond

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...

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 nitric acid and sulfuric acid due to the participation of concentrated nitric acid and sulfuric acid mixed acid, which is not easy to absorb and treat, causing serious pollution to the production environment and the atmospheric environment, and is also easy to cause harm to the operator, and even cause burn accidents

In addition, the metal in the diamond synthesis block includes 30% to 50% of the precious metal, which enters the reaction solution after reacting with the acid and is discharged together with the waste acid solution, resulting in a large waste of resources, which is not conducive to resource regeneration. The waste acid needs to be treated, and the cost of treatment is high