FIELD: industrial inorganic synthesis.
SUBSTANCE: invention relates to the area of hydrochemical fluoride processing of tantalum stock into pure tantalum an niobium compounds. Potassium fluorotantalate is heated to 220-250°C 1-3 times with intermediate coolings to 70-80°C to achieve 85% of product with fineness -100+40 μm. Product is then subjected to ammonia treatment at ambient temperature followed by hydrochloric acid treatment. Ammonia and hydrochloric acid treatments are performed 2-4 times each.
EFFECT: achieved full decomposition of potassium fluorotantalate to form granulated precipitate, increased purity of tantalum pentoxide, moderated purity requirements for starting material and reagents, and reduced corrosion of equipment.
1 dwg, 1 tbl
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