公开(公告)号：EP3331841A2

公开(公告)日：2018-06-13

申请号：EP16822283.4

申请日：2016-08-03

申请人： OCP SA ,  Samrane, Kamal ,  Kossir, Abdelaali ,  Khouloud, Mehdi

发明人： KHOULOUD, Mehdi ,  KOSSIR Abdelaali ,  SAMRANE, Kamal

IPC分类号： C05B7/00 ,  C01B25/238 ,  C05B11/00

CPC分类号： C05B7/00 ,  C01B25/28 ,  C05B11/00 ,  C05B19/00

摘要： The invention relates to a method for manufacturing an ammonium phosphate fertilizer from a phosphoric acid aqueous solution that has less than 50% P205 concentration and is obtained by wet inorganic phosphate treatment, said phosphoric acid containing traces of cadmium. Said method includes the following steps: (a) neutralizing said phosphoric acid solution (1) with ammonia (3) up to a molar ratio N/P of between 0.1 and 0.8; (b) reacting said partially neutralized solution (4) with a sulfide source (6) so as to form a cadmium sulfide precipitate (9); (c) separating said precipitate (9) so as to obtain a refined ammoniated phosphoric acid solution (10), and (d) ammoniating and granulating said refined solution (10) so as to form said fertilizer (12).