公开(公告)号：US20180162740A1

公开(公告)日：2018-06-14

申请号：US15574902

申请日：2016-04-25

申请人： Wlodzimierz MERKA ,  PAGO SP. Z O.O.

发明人： Wlodzimierz MERKA

IPC分类号： C01F11/46 ,  C01B25/32 ,  C01C1/24 ,  C01F11/18 ,  C01F11/38 ,  C01B32/50 ,  C01B7/19 ,  C05D3/02 ,  C05C5/04 ,  C05D9/00

CPC分类号： C01F11/468 ,  C01B7/191 ,  C01B25/324 ,  C01B32/50 ,  C01C1/24 ,  C01F11/18 ,  C01F11/38 ,  C01F11/46 ,  C05C5/04 ,  C05D3/02 ,  C05D9/00

摘要： A method for complex treatment of phosphogypsum comprising crushing of phosphogypsum and its washing with a solution of sulphuric acid, concentration 2-15%, and stirring at 50-80° C., wherein the resultant mixture is separated into a liquid fraction and a sediment containing mostly calcium sulphate, which is characterized in that metals are precipitated from the liquid fraction, mainly lanthanides, phosphates and sulphates of metals soluble in diluted sulphuric acid, and the sediment containing mostly calcium sulphate is converted in the presence of ammonia liquor and carbon dioxide to ammonium sulphate and calcium carbonate, wherein filtered and dried sediment of calcium carbonate is dissolved in a 15-30% solution of nitric acid while stirring continuously, and then the resultant CO2 is recirculated and used in the conversion of the first phase of the sediment, and the resultant mixture is separated into a solution of calcium nitrate with dissolved metals and a sediment of fluorides and silicates with metal precipitate.