Continuous purification process and device for detonation synthesized diamond

Abstract

The invention relates to a continuous purification process and a device for a detonation synthesized diamond. The continuous purification process for the detonation synthesized diamond comprises the following steps: mixing detonation ash with concentrated sulfuric acid having the purity of 95-98% to obtain a raw material slurry, injecting the raw material slurry into a reaction kettle from the bottom or the lower part according to a certain flow rate, injecting 50-60% perchloric acid into the reaction kettle from the bottom of the reaction kettle according to a material treatment amount, and carrying out mixing and stirring to fully generate an oxidation reaction; introducing reactants to a next-stage reaction kettle from the bottom or the lower part according to the feed quantity and thecapacity of the reaction kettle, and supplementing perchloric acid from the bottom of the next-stage reaction kettle; carrying out continuous fractional purification until the material color changes from black to gray. As a method of continuous purification is adopted by the process provided by the invention, the purified finished product of diamond dry powder has high purity and uniform quality,and as perchloric acid is added less in each stage of purification than in an intermittent purification method, the process is safe, reliable, economical and environmentally friendly, the utilizationrate of perchloric acid is high, and the total consumption is reduced.

Description

technical field [0001] The invention relates to a diamond purification process, in particular to a continuous purification process and a device for synthesizing diamond by explosive detonation. Background technique [0002] Detonation synthetic diamond usually uses explosives such as TNT, RDX, HMX and carbon materials such as graphite as raw materials, and detonation reaction is carried out in a closed container with a protective medium , so that the unoxidized free carbon atoms are transformed into nano or micro diamonds under the action of instantaneous ultra-high temperature and high pressure. After the detonation reaction is completed, the detonation ash containing diamonds is collected for purification. [0003] Existing purification all adopts the method of pickling and oxidation to remove amorphous carbon, graphite and other impurities. ZL200620133876.4), nitric acid-sulfuric acid (Xu Kang, Xue Qunji, etc., the method for purifying carbon in synthetic diamonds-acid d...

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Problems solved by technology

What these purification methods all adopt is intermittent reaction, and the utilization ratio of oxidizing agent (such as perchloric acid commonly used) is low, causes waste, increases harmful gas emission simultaneously (Chen Hongwei, Quan Yi, environment and safety in the synthetic diamond technology of dynamic high pressure method Problem Analysis, Journal of Safety and Environment, Volume 6, No. 2, April 2006), increasing the post-processing load; large-scale production requires multiple reactors to react in parallel, and the purification reaction in each reactor is carried out independently , although the amount of reagents is added according to the specified ratio, due to some irresistible factors such as experimental equipment and operating errors, there are slight differences in the quality of finished products in each reactor

Moreover, due to the large number of reactors, the energy consumption in the heating stage is high, and the heat released in the reaction stage is also lost. In the hot summer weather, the heat released by the heating device and the reaction makes the temperature of the workshop as high as 40-50°C. bad environment

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