Title:
EXTRACTION METHOD FOR ION-ADSORBED RARE EARTHS
Document Type and Number:
WIPO Patent Application WO/2022/033041
Kind Code:
A1
Abstract:
The present invention provides an extraction method for ion-adsorbed rare earths. The extraction method comprises the following steps: S1, using calcium chloride solution as a leaching agent to perform leaching on ion-adsorbed rare earth ore, such that rare earths are extracted into the leaching solution in the form of ions, wherein the initial leachate containing rare earths is collected in a first container, and the subsequent leachate containing rare earths is collected in a second container; S2, using aluminum sulfate solution as a leaching agent to perform a second leaching on the ion-adsorbed rare earth ore, such that the remaining rare earths in the rare earth ore are extracted into the leaching solution in the form of ions, wherein the leachate having a pH value greater than 4 is still collected in the second container, the leachate having a pH value less than 4 is collected in the third container; S3, using lime water to leach the leached ion-adsorbed rare earth ore tailings; and then, leaching with water until the pH value of the leaching solution is greater than 6, wherein the leachate having a pH value of less than 4 is collected in the third container, and the leachate having a pH value of greater than 4 is still collected in the first container.
Inventors:
LI YONGXIU (CN)
LI HONGYANG (CN)
WANG KANG (CN)
ZHOU HUAJIAO (CN)
ZHOU XUEZHEN (CN)
LIU YANZHU (CN)
LI DONGPING (CN)
LI JING (CN)
LI HONGYANG (CN)
WANG KANG (CN)
ZHOU HUAJIAO (CN)
ZHOU XUEZHEN (CN)
LIU YANZHU (CN)
LI DONGPING (CN)
LI JING (CN)
Application Number:
PCT/CN2021/083462
Publication Date:
February 17, 2022
Filing Date:
March 27, 2021
Export Citation:
Assignee:
UNIV NANCHANG (CN)
International Classes:
C22B3/10; C22B3/08; C22B3/40; C22B59/00
Foreign References:
| CN111926180A | 2020-11-13 | |||
| CN105331836A | 2016-02-17 | |||
| CN103266224A | 2013-08-28 | |||
| CN107190140A | 2017-09-22 | |||
| CN105803227A | 2016-07-27 | |||
| FI20155097A | 2016-08-13 | |||
| JPH03291332A | 1991-12-20 |
Attorney, Agent or Firm:
SHENZHEN ZICHEN INTELLECTUAL PROPERTY AGENCY LIMITED (CN)
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