METHOD OF PRODUCING AMMONIUM SULPHATE-NITRATE Russian patent published in 2013 - IPC C05C13/00 

FIELD: chemistry.

SUBSTANCE: invention relates to agriculture. The method of producing ammonium sulphate-nitrate, which involves preparation of an aqueous pulp containing ammonium sulphate and ammonium nitrate, subsequent granulation and drying thereof in a drum granulator-drier, wherein the aqueous pulp is obtained in a high-speed ammoniator-evaporator by simultaneously feeding ammonium sulphate solution, 41-60% nitric acid solution and ammonia and the process is carried out until obtaining ammonium sulphate-nitrate at temperature of 105-110°C, and granulation and drying are carried out in two steps - first, furnace gases at 600-800°C are fed into the spraying zone and pulp with moisture content of 5-8% is obtained; the pulp is then deposited onto a curtain of granules and finish drying is carried out with gases at 180-220°C until a finished product with final moisture content of 0.3-0.5% is obtained.

EFFECT: invention enables to obtain ammonium sulphate-nitrate having good consumer properties which satisfy modern requirements, not only for strength of granules and grain-size distribution, but also for obtaining a non-caking and low-hygroscopic product.

3 cl, 4 ex