CALCIUM NITRATE CRYSTALLINE HYDRATE ISOLATION METHOD Russian patent published in 2004 - IPC

Abstract RU 2240284 C1

FIELD: inorganic compounds technology.

SUBSTANCE: invention relates to complex fertilizer production technology via decomposition of naturally occurring phosphates with nitric acid, more specifically to isolation of calcium nitrate crystalline hydrate from nitric-phosphoric acid solution. Method comprises cooling acid solution, crystallization, separating crystals from mother liquor and treating them with nitric acid followed by washing crystals with 35-60% ammonium nitrate solution cooled to temperature between -10 and +10^оС, consumption of the latter being maintained within a range of 0.1 to 0.25 wt parts per 1 wt part crystals.

EFFECT: increased purity of product with regard to nitric acid impurity.

3 ex

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RU 2 240 284 C1

Authors

Sezemin V.A.

Abramov O.B.

Zakharova O.M.

Dates

2004-11-20—Published

2003-07-21—Filed