Method for producing lithium phosphate from a lithium solution
AssigneeSungeel Hitech Co., Ltd.
InventorsSuk-Hyun Byun, Kang-Myung Yi, Ki-Woong Lee, Kwang-Joong Kim, Woo-Young Jung
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Abstract
An embodiment of the present invention provides a method for producing lithium phosphate from a lithium solution, comprising the steps of, preparing a mixture in which a phosphorus-containing material is added to a lithium solution in step 1; adding a basic solution to the prepared mixture to adjust the pH to 10 to 12 in step 2; and making the pH-adjusted mixture react by raising its temperature and filtering to recover lithium phosphate in step 3.
Claims12
A method for producing lithium phosphate from a lithium solution, comprising the steps of,
- preparing a mixture in which a phosphorus-containing material is added to a lithium solution in step 1;
- adding a basic solution to the prepared mixture to adjust the pH to 10 to 12 in step 2;
- and making the pH-adjusted mixture react by raising its temperature and filtering to recover lithium phosphate in step 3.
A method for producing lithium phosphate from a lithium solution, comprising the steps of,
- preparing a mixture in which phosphoric acid is added to a lithium solution in step i;
- adding a basic solution to the prepared mixture to adjust the pH to 10 to 12 in step ii;
- and
- making the pH-adjusted mixture react by raising its temperature to 70° C. to 90° C. and filtering to recover lithium phosphate in step iii.
A method for producing lithium phosphate from a waste solution from a waste battery containing lithium, comprising the steps of,
- preparing a mixture in which phosphoric acid is added 0.8 to 1.2 times the lithium equivalent of a waste solution of a waste lithium battery containing lithium at a concentration of 1.5 g/L to 6.0 g/L, to the waste solution in step a;
- adding sodium hydroxide to the prepared mixture to adjust the pH to 10 to 12 in step b;
- and
- raising the temperature of the pH-adjusted mixture to 70° C. to 90° C. and making it react for 30 to 90 minutes and filtering to recover lithium phosphate containing 85 wt % to 98 wt % of lithium with respect to lithium in the waste solution of step a in step c.
Dependencies are inferred from the claim text.