METHOD FOR PREPARING NITROGEN-POTASSIUM FERTILIZER Russian patent published in 2006 - IPC C05G1/00 C05C1/02 C05D1/00 

FIELD: chemical industry and technology, fertilizers.

SUBSTANCE: method involves feeding ammonium nitrate melt into a mixer for mixing in the amount 33-69 wt.-%, potassium chloride in the amount 22-65 wt.-%, the special mineral additive - phosphogypsum in the amount 2-9 wt.-% and ammonia for maintaining pH value of the mixture in the range 6.5-7,5. Prepared pulp is sprayed to recycle in drum granulator, granulated at the recycle number = 1:(2-2.5) and product is dried. Stirring is carried out in optimal regimen at temperature 100-130°C for 20-30 min. Invention provides enhancing output due to acceleration of the conversion process in simultaneous enhancing fertilizer granules strength and reducing washing out from soil. Invention can be used in manufacturing granulated nitrogen-potassium mineral fertilizers.

EFFECT: improved preparing method of fertilizer.

2 cl, 1 tbl, 14 ex