FIELD: chemistry.
SUBSTANCE: invention can be used in chemical industry. Method of obtaining purified solution of calcium nitrate and conversion calcium carbonate includes apatite decomposition with nitric acid, separation of calcium nitrate by method if freezing, separation of crystals of calcium nitrate tetrahydrate from nitrophosphoric solution by filtration, supply of main calcium nitrate flow for obtaining conversion calcium carbonate, processing of part of calcium nitrate solution with carbonate reagent with further separation of admixture sediment by filtration and its supply into production of conversion calcium carbonate. Admixture sediment is processed with ammonium carbonate solution and together with conversion calcium carbonate is supplied to drying.
EFFECT: invention makes it possible to utilise admixture sediment which is formed in the process of calcium nitrate solution purification.
3 cl, 3 ex
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