METHOD OF AZOTOSULPHATE FERTILISER PRODUCTION Russian patent published in 2009 - IPC C05C1/00 

FIELD: chemistry.

SUBSTANCE: invention refers to production method of fertiliser containing nitrogen and sulphate sulphur, based on ammonium nitrate and sulphate and can be used in chemical industry for production of double fertiliser type NS. Substance of method consists in preparation of aqueous pulp of humidity 7÷15 wt % and temperature above 80°C, containing ammonia nitrate and ammonium sulphate, with added reagent regulating pulp pH, and granulation in granulating drying drum. Granulated is pulp prepared by mixture of ammonium nitrate and ammonium sulphate solution in mass ratio NF₄NO₃:(NH₄)₂SO₄ equal to (2÷7):1, thereafter steamed at final temperature 142÷155°C. Reagent regulating pulp pH is phosphate additive in amount 5÷20 kg P₂O₅ per 1 t of fertiliser.

EFFECT: production of fertiliser with base grain particle size 2÷5 mm and with high granule strength.

4 cl, 1 ex