Method for producing high-purity aqueous lithium salt solution
AssigneeAsaka Riken Co., Ltd.
InventorsKeita Yamada, Yukio Sakuma, Hiroto Inoue
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Abstract
Provided is a method for producing a high-purity aqueous lithium salt solution, the method allowing filtering aluminum phosphate in a short time. The method for producing a high-purity aqueous lithium salt solution includes: a step of adjusting the pH of a slurry containing a mixture of lithium phosphate and aluminum hydroxide obtained from a first aqueous lithium salt solution being a raw material to a range of 2 to 3 to obtain a precipitate of aluminum phosphate; a step of filtering off and removing the precipitate of aluminum phosphate to obtain a second aqueous lithium salt solution; and a step of purifying the second aqueous lithium salt solution to obtain a high-purity aqueous lithium salt solution.
Claims5
A method for producing an aqueous lithium salt solution, comprising:
- a step of adjusting pH of a slurry, wherein the slurry contains a mixture of lithium phosphate and aluminum hydroxide obtained from a first aqueous lithium salt solution being a raw material and containing a lithium salt in a range of 0.1 to 70 g/L in terms of lithium, to a range of 2 to 3 to obtain a precipitate of aluminum phosphate;
- a step of filtering off and removing the precipitate of aluminum phosphate from the slurry containing the mixture of lithium phosphate and aluminum hydroxide to obtain a second aqueous lithium salt solution;
- and
- a step of purifying the second aqueous lithium salt solution to obtain the aqueous lithium salt solution by adjusting pH of the second aqueous lithium salt solution to a range of 7 to 10, and filtering off resulting precipitates of lithium phosphate and aluminum hydroxide.
Dependencies are inferred from the claim text.