Patent · US Active

Method for extracting lithium from salt lake brine and simultaneously preparing aluminum hydroxide

US11414324B2 · kind B2 · utility

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19Claims
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Key dates

Filing dateApr 19, 2019
Grant dateAug 16, 2022
Priority date
Expiry dateApr 23, 2040

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC01P2006/82
  • WIPO fieldChemical engineering
  • WIPO sectorChemistry

Abstract

Described is a method for extracting lithium from salt lake brine and simultaneously preparing aluminum hydroxide. This method includes a. adding an aluminum salt to the brine, adding an alkali solution, then subjecting to crystallization reaction and solid-liquid separation to obtain lithium-containing brine; b. evaporating and concentrating the lithium-containing brine, adding an aluminum salt, adding an alkali solution dropwise to perform a co-precipitation reaction and solid-liquid separation to obtain a lithium-containing layered material filter cake, wherein in steps a and b, the alkali solution is an alkali solution free of carbonate ion; c. dispersing the lithium-containing layered material filter cake in deionized water to form a suspension slurry, then adjusting the pH value of the suspension slurry so as to carry out a lithium deintercalation reaction; d. filtering to obtain aluminum hydroxide filter cake; e. washing the aluminum hydroxide filter cake with deionized water and drying.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.