METHOD FOR MANUFACTURING AN AMMONIUM PHOSPHATE FERTILIZER HAVING LOW CADMIUM CONTENT |
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| 申请号 | PCT/MA2016000012 | 申请日 | 2016-08-03 | 公开(公告)号 | WO2017023153A3 | 公开(公告)日 | 2017-03-30 |
| 申请人 | OCP SA; | 发明人 | KHOULOUD MEHDI; KOSSIR ABDELAALI; SAMRANE KAMAL; | ||||
| 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). | ||||||
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