Method for purifying lithium-containing waste waters during the continuous manufacture of lithium transition metal phosphates
AssigneeSud-Chemie AG
InventorsJosef Fischer, Johannes Hartel
Life of this patent
Estimating the term…
Abstract
A method for continuously manufacturing lithium transition metal phosphates of the formula LiMPO4, comprising the steps of providing an aqueous reaction mixture containing LION, H3PO4, and a transition metal sulphate, converting the reaction mixture into a lithium transition metal phosphate, separating the solid lithium transition metal phosphate from the soluble part of the reaction mixture, subjecting the soluble part (diluate) to an electrodialysis, and isolating the part of the electrodialysate that contains an aqueous LiOH solution.
Claims12
A method for purifying lithium-containing waste waters during the continuous manufacture of lithium transition metal phosphates of the formula LiMPO4 starting from LiOH, comprising the steps of:
- a) providing an aqueous reaction mixture containing LiOH, H3PO4r and a transition metal sulphate;
- b) converting the reaction mixture into 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 an electrodialysis;
- and
- e) isolating the part of the electrodialysate that contains an aqueous LiOH solution.
Dependencies are inferred from the claim text.