Method for efficient separation and enrichment of lithium
US11219864B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 19, 2019 |
| Grant date | Jan 11, 2022 |
| Priority date | — |
| Expiry date | Mar 19, 2039 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2317/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for efficient separation and enrichment of lithium includes the following steps: pretreatment: diluting and filtering salina aged brine to obtain pretreated brine; separation: separating the pretreated brine via a nanofiltration separation system to obtain nanofiltration permeate and nanofiltration concentrate, wherein the operation pressure of the nanofiltration separation system is 1.0 MPa˜5.0 MPa; first concentration: carrying out first concentration on the nanofiltration permeate via a reverse osmosis system to obtain reverse osmosis concentrate and reverse osmosis permeate; and second concentration: carrying out second concentration on the reverse osmosis concentrate via an electrodialysis system to obtain electrodialysis concentrate and electrodialysis permeate, wherein the electrodialysis concentrate is a solution enriching lithium ions. The present application couples several different membrane separation technologies and adopts the monovalent ion selective nanofiltration membrane having good separation performance in the process of nanofiltration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.