公开(公告)号：JPS56169125A

公开(公告)日：1981-12-25

申请号：JP6384581

申请日：1981-04-27

Applicant: STAMICARBON

Inventor： KOONERISU ANTONIUSU MARIA RAET ,  YOHANNESU ANNA YANSEN

IPC: C01B25/238 ,  C01F17/00 ,  C22B59/00

公开(公告)号：JPS57118032A

公开(公告)日：1982-07-22

申请号：JP19433081

申请日：1981-12-02

Applicant: Stamicarbon

Inventor： KOONERISU ANTONIUMU MARIA UETA ,  YOHANNESU ANNA YANSEN

IPC: C01G43/00 ,  C01B25/222 ,  C01B25/238 ,  C01B25/46 ,  C22B60/02

CPC classification number: C22B60/0282 ,  C01B25/461 ,  C01B25/463

公开(公告)号：JPS57156328A

公开(公告)日：1982-09-27

申请号：JP20679081

申请日：1981-12-21

Applicant: STAMICARBON

Inventor： KOONERISU ANTONIUSU MARIA UETA ,  RUISU HENRI MARIA RAMAKERUSU ,  YOHANNESU ANNA YANSEN

IPC: C01B25/00 ,  C01F11/46 ,  C01F17/00

Abstract: Recovery of yttrium, lanthanides and radium free calcium sulphate in a phosphoric acid process by digesting phosphate rock with an excess of phosphoric acid in the presence of more than about 5 wt.% of SO4-ions calculated to the amount of phosphate rock, separating out the insoluble residue and recovering yttrium and lanthanides therefrom, precipitating calcium sulphate from the remaining solution with sulphuric acid and separating this calcium sulphate from the resulting phosphoric acid solution.