METHOD OF OBTAINING COMPLEX FERTILISER Russian patent published in 2008 - IPC C05B11/00 C05B11/06

Abstract RU 2336250 C2

FIELD: chemistry, agriculture.

SUBSTANCE: method of obtaining complex fertiliser includes decomposition of apatite with nitric acid, cooling of nitric-acid extract with further separation of calcium nitrate sediment from mother liquor, separation of calcium phosphates sediment from nitrate-phosphate solution and processing the latter into complex NP or NPK fertilisers, ammoniating being performed in two stages, supporting on the first stage percentage of nitric acid 0.1÷1.0% wt, and on the second stage supporting pH 4.0÷5.5. Degree of calcium release is supported within 25-64% from the supplied to ammoniating. Time of ammoniated suspension stay at the second stage constitutes 30-60 minutes.

EFFECT: productivity of filtration of ammoniated suspension according to said method exceeds productivity of ammoniated suspension filtration according to prototype.

2 cl, 3 ex

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RU 2 336 250 C2

Authors

Genkin Mikhail Vladimirovich

Kiselevich Petr Viktorovich

Dates

2008-10-20—Published

2006-04-06—Filed