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1.发明授权PROCESS FOR PRODUCTION OF PHOSPHORIC ACID BY CRYSTALLISATION OF PHOSPHORIC ACID HEMIHYDRATE 有权用于生产PHOSPHORIC结晶PHOSPHORIC半水
公开(公告)号：EP1171382B1
公开(公告)日：2002-12-04
申请号：EP00914207.6
申请日：2000-03-23
申请人： KEMIRA CHEMICALS OY
IPC分类号： C01B25/234
CPC分类号： C01B25/234
摘要： The invention relates to a process for producing simultaneously food-grade and fodder-grade phosphoric acid by crystallizing phosphoric acid hemihydrate, H3PO4 x 0.5 H2O, from a prepurified feed acid, which is purified and crystallized with the help of the following steps, a) after the step of froth-flotation of phosphate concentrate, the concentrate is directed to a strongly magnetic separation step in order to decrease the Mg ion amount, b) the phosphate concentrate is leached in a mixture of sulfuric acid and phosphoric acid according to the wet process, the precipitated SO4 and As ions are removed, and a silicon source is added in order to adjust the F/Si molar ratio to 58% P2O5, solids concentration of
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2.发明公开PROCESS FOR PRODUCTION OF PHOSPHORIC ACID BY CRYSTALLISATION OF PHOSPHORIC ACID HEMIHYDRATE 有权用于生产PHOSPHORIC结晶PHOSPHORIC半水
公开(公告)号：EP1171382A1
公开(公告)日：2002-01-16
申请号：EP00914207.6
申请日：2000-03-23
申请人： KEMIRA CHEMICALS OY
IPC分类号： C01B25/234
CPC分类号： C01B25/234
摘要： The invention relates to a process for producing simultaneously food-grade and fodder-grade phosphoric acid by crystallizing phosphoric acid hemihydrate, H3PO4 x 0.5 H2O, from a prepurified feed acid, which is purified and crystallized with the help of the following steps, a) after the step of froth-flotation of phosphate concentrate, the concentrate is directed to a strongly magnetic separation step in order to decrease the Mg ion amount, b) the phosphate concentrate is leached in a mixture of sulfuric acid and phosphoric acid according to the wet process, the precipitated SO4 and As ions are removed, and a silicon source is added in order to adjust the F/Si molar ratio to 58% P2O5, solids concentration of
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