Lithium adsorbent and method for lithium extraction from salt lake
AssigneeBYD Company Limited
InventorsJialiang Wei, Hongye Lin, Junlan Lian
Life of this patent
Estimating the term…
Abstract
A lithium adsorbent includes an aluminum-based adsorbing material, a binder, and a wetting and dispersing agent. The binder includes at least one of a vinylidene fluoride-chlorotrifluoroethylene (VDF-CTFE) copolymer and a fluoroolefin-vinyl ether copolymer. The wetting and dispersing agent includes one or more of polyethylene glycol, sodium polyacrylate, polyvinyl alcohol, and formaldehyde condensate.
Claims9
A lithium adsorbent, comprising an adsorbing material, a binder, and a wetting and dispersing agent, wherein the binder comprises at least a vinylidene fluoride-chlorotrifluoroethylene copolymer, and the wetting and dispersing agent comprises one or more of polyethylene glycol, sodium polyacrylate, polyvinyl alcohol, and formaldehyde condensate;
- wherein a molecular weight of the vinylidene fluoride-chlorotrifluoroethylene copolymer is 200,000 g/mol to 600,000 g/mol;
- and
- wherein a decreased proportion of weight of the lithium adsorbent after 100 cycles of adsorption-washing-desorption is less than 0.1%.
A method for lithium extraction from a salt lake, comprising:
- contacting a salt lake brine with a lithium adsorbent to perform a lithium adsorption process, and obtaining a lithium-rich adsorbent;
- and
- washing the lithium-rich adsorbent, performing a lithium desorption process with a desorbent, and obtaining a desorption solution,
- wherein the lithium adsorbent comprises an adsorbing material, a binder, and a wetting and dispersing agent, the binder comprises at least a vinylidene fluoride-chlorotrifluoroethylene copolymer, and the wetting and dispersing agent comprises one or more of polyethylene glycol, sodium polyacrylate, polyvinyl alcohol, and formaldehyde condensate;
- wherein a molecular weight of the vinylidene fluoride-chlorotrifluoroethylene copolymer is 200,000 g/mol to 600,000 g/mol;
- and
- wherein a decreased proportion of weight of the lithium adsorbent after 100 cycles of adsorption-washing-desorption is less than 0.1%.
Dependencies are inferred from the claim text.