METHOD OF PRODUCING GRANULAR COMPOUND FERTILISER Russian patent published in 2010 - IPC C05C1/00 C05G1/00 C05C9/00 

FIELD: chemistry.

SUBSTANCE: method involves feeding granulation centres in form of initial granular fertiliser and separate and simultaneous feeding of liquid and solid components which provide the given final composition of the product. The granulation centres used are prilled granules of ammonium nitrate, carbamide, NPK fertiliser. The liquid component used is an aqueous solution at 90-110°C and containing 70-90% ammonium nitrate or carbamide and 0.1-4.5 wt % of one additive selected from: ammonium sulphate, potassium sulphate, caustic magnesite, ammonium phosphate, iron (III) oxide, boric acid. The solid component used is calcium carbonate, magnesium carbonate, potassium sulphate, ammonium phosphate, ammonium sulphate, carbamide, zeolite, magnesium hydroxide. The liquid and solid components are fed into a granulator in ratio necessary for continuous binding of the stream of powder onto the surface of granules and minimum time of contact between the liquid and solid components.

EFFECT: invention enables to obtain fertiliser with high static strength, resistance to heating and cooling and low caking.

4 cl, 5 tbl, 21 ex