FIELD: chemistry.
SUBSTANCE: invention relates to chemical methods of purifying natural diamonds, where contaminants are in form of organic and mineral deposits and metallic impurities formed through enrichment of diamond-bearing rocks, as well as synthetic diamonds in which metallic impurities accompany synthesis, with the aim of using the said diamonds as grinding powder in electroplating when making a precision diamond tool. The method involves treatment of diamond at normal atmospheric conditions in a solution with the following composition: water, hydrofluoric acid, nitric acid, sulphuric acid and hydrogen peroxide in volume ratio of 5:1:1:2:(1-10) respectively, with periodic addition of hydrogen peroxide in proportion to its consumption. Nickel metal is added to the solution before treatment of the diamond.
EFFECT: invention provides comprehensive purification of fine diamond (4-160 micrometres) from organic contaminants and metal microinclusions.
1 ex
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