Patent ID: 7744672
Filing Date: 2010-06-29
Classification: C05C

Abstract:
1. A process for producing a complex granulated nitrogen-potash fertilizer, said process comprises a mixing of an ammonium nitrate melt with a solid potassium chloride and a specific mineral admixture, which reduces a leachability of the fertilizer from the soil, in the presence of ammonia, a dosage of ammonia is chosen under a condition to keep a pH value of the mixture within the range of 6.5-7.5, granulation of the mixture in a drum granulator and drying of the product, characterized in that phosphogypsum is used as the specific mineral admixture and the components are fed for the mixing under the following ratios, weight %: ammonium nitrate 33-69; potassium chloride 22-65; phosphogypsum 2-9; and granulation is carried out under a recycle ratio, which is a ratio between the final product and the recycle product, being equal to 1:(2-2.5).