公开(公告)号：US11999626B1

公开(公告)日：2024-06-04

申请号：US18373975

申请日：2023-09-28

申请人： Chongyi Zhangyuan Tungsten Co., Ltd.

发明人： Guozuan Xu ,  Daibin Zhang ,  Chenglong Huang ,  Quan Peng ,  Xin Zhang ,  Qiumin Yang

IPC分类号： C01C1/28 ,  C01G41/00 ,  C22B3/06 ,  C22B3/08 ,  C22B3/10 ,  C22B3/44 ,  C22B3/22

CPC分类号： C01C1/28 ,  C01G41/00 ,  C22B3/06 ,  C22B3/08 ,  C22B3/10 ,  C22B3/22 ,  C22B3/44

摘要： The present disclosure relates to the field of tungsten smelting, and in particular to a leaching method of scheelite, and provides a new technology that scheelite is leached in low temperature with a mixture acid of sulfuric acid and hydrochloric acid or nitric acid and hydrochloric acid, calcium is precipitated incompletely, and then the acid leaching solution is regenerated and closed-circuit recycled is provided. The new technology is able to leach scheelite sufficiently in low temperature so as to improve the recovery rate of tungstate and decrease the requirement of equipment. As well, the inner wall of the reaction kettle, the heating pipe and the temperature measuring device are made of steel lined tetrafluoro material which has high acid corrosion resistance and is able to deal with scheelite with high fluorine, resists the corrosion of HF.