METHOD OF PRODUCING COMPOUND MINERAL FERTILISER Russian patent published in 2011 - IPC C05G1/06 

FIELD: chemistry.

SUBSTANCE: invention relates to production of complex mineral fertiliser containing other nutrients besides nitrogen and phosphorus. The method involves premixing phosphoric acid and ammonia, followed by mixing the obtained ammonium phosphate pulp with sulphuric acid and ammonia, adding a potassium-containing additive, granulating and drying the product. Premixing concentrated phosphoric acid and ammonia is carried out in a reactor-mixer. Subsequent mixture of ammonium phosphate pulp with sulphuric acid and ammonia is carried out in a tubular reactor. The ammonium phosphate pulp and ammonium phosphate are sprayed onto a recycle mixture, potassium chloride and carbamide in an ammoniator-granulator.

EFFECT: invention increases efficiency of the process of producing fertiliser, increases content of nutrients in the fertiliser, enables utilisation of heat of neutralisation of sulphuric acid with ammonia to evaporate moisture and pulp, minimises aggressive effect of sulphuric acid on equipment.

1 dwg, 1 ex