Process for producing battery-grade lithium carbonate from wastewater solution containing lithium and sodium recovered from ternary battery

Abstract

Disclosed is a process for producing battery-grade lithium carbonate from a wastewater solution containing lithium and sodium recovered from a ternary battery, including the following steps: S1: adding activated carbon into the wastewater solution containing lithium and sodium for mixing to obtain a pretreated solution; S2: adding an extracting agent into the pretreated solution for mixing, and performing a first post-treatment for lithium precipitation, to obtain a lithium precipitation slurry and a lithium precipitation mother solution; and S3: performing a second post-treatment for the lithium precipitation slurry, to obtain battery-grade lithium carbonate. In S2, the extracting agent includes 2-ethylhexyl hydrogen-2-ethylhexyl phosphonate and 1-ethyl-3-methylimidazolium tetrafluoroborate. The technical solution described above solves the problem of low recovery rate in lithium carbonate extraction in the related art.

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