METHOD FOR EXTRACTING ECONOMICALLY LITHIUM PHOSPHATE WITH HIGH PURITY FROM BRINE

摘要

PURPOSE: A method for extracting lithium phosphate of high purity from brine is provided to efficiently extract lithium without the evaporation and the concentration of brine. CONSTITUTION: A method for extracting lithium phosphate of high purity from brine includes the following: lithium contained in brine is separated by implementing an electrodialysis device equipped with a monovalent cation exchanging membrane; phosphoric acid or phosphate compounds are introduced into filtrate which is obtained from the lithium separation, and the filtrate is heated to settle lithium into lithium phosphate; and the settled lithium phosphate is filtered form the filtrate, and the separated lithium phosphate is collected.