Process for purifying lithium-containing effluents in the continuous production of lithium transition metal phosphates

摘要

The present invention relates to a process for the continuous preparation of lithium transition metal phosphates of the formula LiMPO, comprising the steps of a) providing an aqueous reaction mixture containing LiOH, HPO and a transition metal sulfate, b) reacting the reaction mixture to a lithium transition metal phosphate, c) separating the solid lithium transition metal phosphate from the soluble Part of the reaction mixture, d) subjecting the soluble part (diluate) to electrodialysis, e) isolating the part of the electrodialysate containing an aqueous LiOH solution.