HIGH PURITY PURIFICATION METHOD OF GRAPHITE SEPARATED FROM SECONDARY BATTERY

摘要

Disclosed is a high purity purification method of graphite separated from a secondary battery, and more specifically, the method comprises: a graphite recovery step which wet digests an anode material separated from a secondary battery and then filters the same to recover graphite; a sintering step which sinters the graphite recovered through the graphite recovery step; a hydrochloric acid reaction step which mixes the graphite sintered through the sintering step with de-ionized water and a hydrochloric acid; a first cleaning and filtering step which cleans and filters the graphite treated by the hydrochloric acid through the hydrochloric acid reaction step; a sulfuric acid reaction step which mixes the graphite cleaned through the first cleaning and filtering step with the de-ionized water and a sulfuric acid; a second cleaning and filtering step which cleans and filters the graphite treated by a sulfuric acid through the sulfuric acid reaction step; and a drying step which dries the graphite cleaned through the second cleaning and filtering step. The purification method through the steps purifies graphite separated from a secondary battery to be wasted with a simple process, thereby being able to recover the same with high purification.;COPYRIGHT KIPO 2018