METHOD OF PRODUCING COMPOUND FERTILISERS Russian patent published in 2012 - IPC C05B11/00 

FIELD: agriculture.

SUBSTANCE: method of producing compound fertilisers, which includes neutralisation of phosphoric acid with ammonia, granulating the resulting pulp with simultaneous finished ammoniation of charge, drying of the product and subsequent purification of exhaust gases by absorption of ammonia and fluoride with water containing calcium sulfate; return of waste absorption solution to the neutralisation stage as water containing calcium sulfate; sewage waters are used after regeneration of H-filters containing calcium sulfate in an amount of 2-6 g/l and sulfuric acid 1-4 g/l.

EFFECT: invention enables to improve the quality of fertiliser due to reducing the porosity of the product while simultaneous increasing the degree of purification of exhaust gases.

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