METHOD FOR PREPARING IRON PHOSPHATE FROM LITHIUM EXTRACTION SLAG OF WASTE LITHIUM IRON PHOSPHATE POSITIVE ELECTRODE POWDER AND APPLICATION

摘要

The present invention relates to the technical field of lithium battery new energy materials, and provides a method for preparing iron phosphate from lithium extraction slag of waste lithium iron phosphate positive electrode powder and an application. The method comprises: dissolving the lithium extraction slag of the waste lithium iron phosphate positive electrode powder by means of an acid solution to obtain an acidic iron-phosphorus solution, heating the acidic iron-phosphorus solution, stirring the heated acidic iron-phosphorus solution to separate out an iron phosphate precipitate, and further treating the iron phosphate precipitate to obtain a finished iron phosphate product. The method is low in energy consumption, low in costs and simple in operation, and implements resource utilization of a waste lithium iron phosphate battery positive electrode material; and the prepared iron phosphate can be used as a raw material for preparing the lithium iron phosphate positive electrode material, and can also be used for manufacturing ceramics, coatings and the like.