FIELD: chemical technology. SUBSTANCE: method is carried out in two steps. Initially origin mixture is washed and dried. Then dry mixture is treated by oxidation mixture which comprises nitric acid (its quantity being 64-89 mass %) and sulfuric acid. Mass ratio of said dry mixture and said mixture of acids is 1:(20-25) respectively. During said treatment nitric acid is added by portions in periodic regime. Thus prepared particles are 
in size. EFFECT: improved conditions of isolation of ultradisperse diamond particles, increased their yield.
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