METHOD OF PRODUCTION OF COMPLEX FERTILIZER CONTAINING NITROGEN, CALCIUM AND SULFUR Russian patent published in 2002 - IPC

FIELD: fertilizers. SUBSTANCE: invention relates to methods of production of complex fertilizers containing nitrogen, calcium and sulfur and can be used in chemical industry and agriculture. Method involves mixing ammonium nitrate melt with component or components containing calcium and sulfur, granulation of obtained mixture in drum granulator. Ammonium nitrate melt is taken in the amount 60-98 wt.% and mass ratio value of nitrogen in a mixture before drum granulator and in ready product is maintained in the range = 1.001-1.04. Gypsum, phosphogypsum, metallurgic slag and/or their mixtures are used as a component containing calcium and sulfur. Dolomite, chalk, limestone, cement dust and/or their mixtures are used as a component containing calcium. Also, sulfur, potassium sulfate, magnesium sulfate and/or their mixtures are used as a component containing sulfur. Fertilizer prepared in line with invention comprises, wt.%: N, 20.43-33.2; Ca, 0.59-11.76; S, 0.47-9.41. EFFECT: enhanced exploitation safety of method, enhanced output in producing complex fertilizer containing nitrogen, calcium and sulfur. 6 cl, 1 tbl