METHOD FOR PREPARING AMMONIUM PHOSPHATE SOLUTION Russian patent published in 2004 - IPC

FIELD: fertilizers.

SUBSTANCE: invention proposes a method for preparing ammonium phosphate solution used as a phosphorus-containing component of completely water-soluble nitrogen-phosphorus or nitrogen-phosphorus-potassium fertilizers. Ammophos is treated with water, acidified with nitric acid solution representing a solution containing calcium nitrate and nitric acid taken in the ratio = 20ч(3:1). Consumption of nitric acid solution is maintained as measured 0.5ч2.5 g of 100% nitric acid and 6.5ч10 g of calcium nitrate per 100 g of ammophos. Solution is prepared from calcium nitrate tetrahydrate, by-side product in manufacturing complex fertilizers, in the concentration 32ч38% by calcium nitrate, neutralization is carried out to pH 5ч6 and the end product is separated from precipitate of impurities. Invention provides high effectiveness in purifying the end product from impurities of iron, aluminium and fluorine, increasing filtering capacity of impurities by above 4 times, and simplifying industrial realization of the method.

EFFECT: improved preparing method.

4 cl, 2 ex