Environment-friendly diamond purification method based on high-temperature air

Abstract

The invention provides an environment-friendly diamond purification method based on high-temperature air. The environment-friendly diamond purification method comprises the following steps: S1, weighing a proper amount of diamond synthesis blocks, pulverizing, and putting the pulverized particles into a crucible; S2, putting the crucible filled with the pulverized particles of the diamond synthesis blocks into a muffle furnace, heating to 450-550 DEG C within 50-60 minutes, and keeping the temperature at 550 DEG C for 290-310 minutes; S3, taking out the crucible after heat preservation is finished, naturally cooling to room temperature, and transferring into a round-bottom flask; S4, adding a proper amount of diluted hydrochloric acid into the round-bottom flask, heating to 120-150 DEG C,and carrying out heat preservation reaction for 40-60 minutes; S5, after the reaction is finished, cooling to room temperature, and cleaning with tap water; and S6, after cleaning is completed, dryingwater in a drying oven at a temperature of 100 DEG C to obtain the diamond particles. According to the invention, when synthetic diamond is purified, no gas polluting the environment is generated while the quality of a purified diamond sample can be remarkably improved, a diamond phase cannot be obviously lost, and the use value of the synthetic diamond is improved.

Description

technical field [0001] The invention belongs to the technical field of synthetic diamond purification methods, and in particular relates to an environment-friendly diamond purification method based on high-temperature air. Background technique [0002] At present, in the diamond system synthesized by the high temperature and high pressure method with the participation of metal catalysts, the yield of diamond is between 20% and 30%, and there are still a large amount of graphite and metal catalysts in the obtained diamond synthesis blocks. The catalyst is mainly iron. Nickel alloy, the metal catalyst is the catalyst of the reaction process, because the synthesis process is carried out under high temperature and pressure, which leads to the hard texture of the obtained diamond system, and it is extremely difficult to mix unreacted graphite, metal catalyst and diamond together. The three are separated to obtain diamond, which brings great inconvenience to the purification of di...

AI Technical Summary

Problems solved by technology

[0002] At present, in the diamond system synthesized by the high temperature and high pressure method with the participation of metal catalysts, the yield of diamond is between 20% and 30%. There are still a large amount of graphite and metal catalysts in the obtained diamond synthesis block, and the catalyst is mainly iron. Nickel alloy, metal catalyst is the catalyst of this reaction process, because it is a synthetic process under high temperature and high pressure, which leads to the hard texture of the obtained diamond system, and it is extremely difficult to mix unreacted graphite, metal catalyst and diamond together. The three are separated to obtain diamond, which brings great inconvenience to the purification of diamond.

[0003] At present, the diamond purification method is to use mixed acid treatment, that is, to mix concentrated sulfuric acid and concentrated nitric acid in a certain proportion, and to purify the diamond in the diamond synthesis block through redox reaction, but a large amount of reddish-brown, toxic The gas with pungent smell, the mixed gas is mainly nitrogen oxides, sulfur dioxide and sulfur trioxide, which will not only cause great pollution to the environment, but also increase the cost of tail gas treatment to a large extent, and at the same time There are still a small amount of impurities in the diamond obtained by this method, and the existence of these impurities seriously limits the application of diamond in more fields and affects the value of synthetic diamond after purification

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