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Application

2004100999/15, 2004-01-12

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Start date

2004-01-12

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Actual filing date

2004-01-12

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Published

2004-12-27

(72)

Inventor

Sezemin V.A.Abramov O.B.Khabibullin R.G.Bojkov S.V.Koshcheev V.A.Garaev R.M.Dedov A.S.Kiselevich P.V.Mukhacheva T.E.

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Holder

Otkrytoe Aktsionernoe Obshchestvo Khimicheskij Kombinat Imeni B.P. Konstantinova"

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

Abstract RU 2243162 C1

FIELD: mineral fertilizers.

SUBSTANCE: invention relates to technology of complex fertilizers via nitric acid method, in particular to isolation of calcium nitrate crystal hydrate from nitric-phosphoric acid solution. Initial solution is cooled to initiate crystallization. Crystals, once separated from mother liquor, are washed with cooled (from -10 to +5^оС) 5-35% nitric acid solution in proportion of 0.05-0.15 wt parts per 1 wt part crystals, then treated with nitric acid, and washed with the same cooled nitric acid solution now in proportion of 0.1-0.15 wt parts per 1 wt part treated crystals.

EFFECT: increased crystal washing efficiency allowing effective removal of nitric acid from salt crystals.

4 cl, 3 ex

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RU 2 243 162 C1

Authors

Sezemin V.A.

Abramov O.B.

Khabibullin R.G.

Bojkov S.V.

Koshcheev V.A.

Garaev R.M.

Dedov A.S.

Kiselevich P.V.

Mukhacheva T.E.

Dates

2004-12-27—Published

2004-01-12—Filed