公开(公告)号：WO2015075317A1

公开(公告)日：2015-05-28

申请号：PCT/FI2014/050891

申请日：2014-11-21

Applicant: TEKNOLOGIAN TUTKIMUSKESKUS VTT OY

Inventor： KOUKKARI, Pertti ,  MÄKINEN, Jarno ,  BOMBERG, Malin ,  LEHTONEN, Anna ,  ARNOLD, Mona

IPC: C22B59/00 ,  C22B7/00 ,  C22B3/18 ,  B03C1/00 ,  B03C1/015 ,  B03C1/02 ,  C01F17/00 ,  C02F1/48 ,  C02F101/10

CPC classification number: C22B59/00 ,  B03C1/015 ,  B03C1/02 ,  C01F17/0087 ,  C22B3/18 ,  C22B7/00 ,  Y02P10/234 ,  Y02P10/238

Abstract: The present invention relates to a method for recovering rare earth metals from waste sulphate materials, such as waste gypsum, which is a known secondary resource of rare earth metals and widely present e.g. in areas, where industrial phosphate production takes place. The present invention combines sulphate reduction treatment, such as bioreduction with sulphate reducing bacteria, and magnetic separation, which is based on an exceptionally high magnetic susceptibility of rare earth compounds compared to e.g. calcium compounds in such reductively pretreated gypsum precipitate.

Abstract translation: 本发明涉及从诸如废石膏的废硫酸盐材料中回收稀土金属的方法，废石膏是已知的稀土金属二次资源，例如广泛存在。 在发生工业磷酸盐生产的地区。 本发明将硫酸盐还原处理如生物还原细菌与硫酸盐还原细菌相结合，并将磁性分离与稀土化合物相比具有极高的磁化率。 这种还原性预处理石膏中的钙化合物沉淀。