Method for treating solution containing rare earth
US10253394B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 24, 2013 |
| Grant date | Apr 9, 2019 |
| Priority date | — |
| Expiry date | Feb 18, 2036 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
The present invention provides a treating method for a solution containing rare earth, wherein the method comprising: (1) performing a fine-grained clay adsorption on the solution containing rare earth with fine-grained clay, the conditions of the fine-grained clay adsorption allow that solution adsorbed by said fine-grained clay contains rare earth with a concentration calculated by rare earth oxides not higher than 1 mg/L; (2) performing a coarse-grained clay adsorption on the solution adsorbed by said fine-grained clay with coarse-grained clay, the conditions of coarse-grained clay adsorption allow that solution adsorbed by said coarse-grained clay contains rare earth with a concentration calculated by rare earth oxides not higher than 0.5 mg/L; the grain diameter of at least 90% of said fine-grained clay particles is smaller than the grain diameter of said coarse-grained clay particles, and the grain diameter of said fine-grained clay is within a range of 1-250 μm, and the grain diameter of said coarse-grained clay is within a range of 150-1,000 μm; and (3) desorbing rare earth from said fine-grained clay undergone the fine-grained clay adsorption and said coarse-grained clay u…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.