发明名称 |
Process for the removal of cadmium from solutions of phosphoric acid. |
摘要 |
<p>Described is a process for the removal of cadmium from solutions of phosphoric acid deriving from the sulphuric and/or nitric acid digestion of phosphatic rocks, including the following fundamental operations: addition to the solution of phosphoric acid of bromide ions, up to concentrations ranging from 100 to 3500 ppm, and at least one condensed polyphosphatic compound in a concentration of from 1 to 5% by weight; elution of the mixture thus obtained on at least two beds of ion-exchange resin with a styrene-divinylbenzene matrix, at a temperature ranging from 15 to 50 DEG C. o</p> |
申请公布号 |
EP0536466(A1) |
申请公布日期 |
1993.04.14 |
申请号 |
EP19920107224 |
申请日期 |
1992.04.28 |
申请人 |
ENICHEM AGRICOLTURA S.P.A. |
发明人 |
CALICCHIO, GAETANO;BASSAN, FABIO, DR.;MEGUMI ITO, NORMA |
分类号 |
B01J47/04;C01B25/234;C01B25/238;C01G11/00;C22B7/00 |
主分类号 |
B01J47/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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