FIELD: agriculture.
SUBSTANCE: complex fertiliser contains nitrogen, calcium, sulphur; its application in chemical can find of the industry. Prepare a water pulp with moisture of 5÷15 wt %, containing ammoniac saltpeter and sulphate and calcium salts, its granulating in the drum-type granulating dryer. The pulp is granulated, prepared by processing of calcium nitrate solution by sulphate of ammonium, rich with the last mentioned substance over stoichiometry, equal (0.2÷1) mol on 1 mol of calcium nitrate, with the additive of nitrate of ammonium, with the subsequent evaporation and addition to the evaporated mix of carbonate of calcium from calculation (0.8÷1.2) mol CaCO3 on 1 mol of excess sulphate of ammonium.
EFFECT: fertiliser meets modern requirements to granulometric structure, and increase in durability of granules in comparison with known ways.
7 cl, 1 ex
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