The invention relates to a method for recycling valuable
metal from a waste
nickel-
cobalt-
manganese lithium ion battery. The method comprises the following steps of: dismounting, discharging and crushing the battery, soaking crushed waste
nickel-
cobalt-
manganese lithium ions into
sulfuric acid with certain concentration, adding a
reducing agent to strip positive and negative pole pieces, and leaching valuable metals of
nickel,
cobalt,
manganese and
lithium; and replacing leach liquor with
iron powder to remove
copper, carrying out hydrolyzing to remove iron and aluminum, and dosing an
impurity-removed solution to synthesize an aluminum coated nickel, cobalt and manganese ternary positive
electrode material precursor, evaporating and concentrating the synthesized solution, adding carbonateor introducing
carbon dioxide to recycle lithium. According to the method disclosed by the invention, stripping and leaching are synchronously completed, chemical
precipitation is performed to removecopper, iron and aluminum,
slag amount is small,
slag filter performances are good, and the
impurity-removed solution is used for synthesizing the aluminum coated nickel, cobalt and manganese ternaryprecursor, so that the
recovery rate of valuable
metal is increased; and the
recovery rate for nickel, cobalt and manganese is 96% or higher in the whole process, the
total recovery rate of lithium is90% or higher, the technological process is short, operation is simple, equipment is less, and the cost is low.