公开(公告)号：US20170320749A1

公开(公告)日：2017-11-09

申请号：US15527512

申请日：2015-11-16

申请人： K-Max Pty Ltd

发明人： Gary Donald JOHNSON ,  Mark Daniel URBANI ,  Nicholas John VINES

IPC分类号： C01D5/02 ,  C01G49/04 ,  C01F7/74 ,  C01F5/40 ,  C01B25/26 ,  C01G49/08 ,  C01B17/50

CPC分类号： C01D5/02 ,  C01B17/501 ,  C01B25/26 ,  C01D5/00 ,  C01F5/40 ,  C01F7/741 ,  C01G49/009 ,  C01G49/04 ,  C01G49/06 ,  C01G49/08

摘要： A method for the processing of potassium containing materials comprises: (i) Separation of a potassium containing mineral from gangue minerals; (ii) Acid leaching whereby substantially all potassium, iron, aluminium and magnesium is solubilised and mixed potassium/iron double salt formed; (iii) Selectively crystallising the mixed potassium/iron double salt formed in the leach step (ii); (iv) Second separation to separate the mixed potassium/iron double salt formed in step (iii); (v) Thermal decomposition to produce an iron oxide, a potassium salt and one or more phosphates; (vi) Leaching the product of the thermal decomposition; (vii) Third separation to separate the iron oxide and phosphate from the potassium salt; (viii) Recovering the potassium salt by crystallisation; (ix) Separating the iron oxide and phosphate of step (vii) by leaching and subsequent solid liquid separation; and (x) Precipitating phosphate from liquor produced in step (ix) through the addition of a base.