METHOD FOR PREPARING NITROGEN-SULFATE FERTILIZER AND NITROGEN-SULFATE FERTILIZER Russian patent published in 2003 - IPC

FIELD: chemical technology, fertilizers. SUBSTANCE: invention relates to methods for preparing granulated nitrogen-sulfate fertilizers based on carbamide and ammonium sulfate. Method involves mixing carbamide solution with ammonium sulfate solution taken in the amount 14-50 wt.-%, evaporation of the prepared mixture and processing at 100-140 C. Method involves feeding to mixing ammonium sulfate solution in the concentration 50-80 wt.-% and carbamide solution in the concentration 70-90 wt.-% and nitrogen-sulfate fertilizer contains, wt.-%: nitrogen, 33.5-42.4; sulfur, 12.0-3.36. The prepared fertilizer shows good agrochemical properties and its application expands the range of agriculture crops to be treated with the proposed fertilizer. EFFECT: improved and simplified preparing method, expanded assortment. 3 cl, 1 tbl, 5 ex