| 摘要 |
FIELD: chemistry, agriculture. ^ SUBSTANCE: method of obtaining complex nitrogen-phosphorous fertiliser based on ammonium nitrate with addition of phosphate includes step-by-step neutralisation of nitric acid with ammonium, evaporating of neutralised solution, introduction of phosphate additive and product granulation. According to invention as phosphate additive, sediment of calcium phosphate, obtained by separation of preliminary ammonated pulp, formed in nitric-acid or hydrochloric-acid break-down of apatite concentrate, is used. Percentage of phosphates in fertiliser in terms of P2O5 constitutes 2-9 wt %, nitrogen - 27-32 wt %. ^ EFFECT: increase of fire-explosion safety of fertilizer and increase of phosphorus percentage. ^ 2 cl, 1 tbl, 6 ex |
