FIELD: inorganic chemistry, chemical technology.
SUBSTANCE: method for preparing calcium molybdate involves treatment of the parent potassium molybdate solution with calcium nitrate taken in the stoichiometrically necessary amount and with addition of nitric acid wherein its mass ratio to potassium carbonate containing in the parent solution is 0.90-0.96. Invention provides the extraction degree of molybdenum-containing solutions up to 99.2% and to obtain calcium molybdate without formation of waste. Invention can be used in hydrometallurgy of rare metals in processing molybdenum-containing solutions.
EFFECT: improved preparing method.
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