Method for recovering nickel, cobalt and manganese, recovered material and recovery system

The invention provides a nickel-cobalt-manganese recovery method, a material obtained through recovery and a recovery system.The nickel-cobalt-manganese recovery method comprises the following steps that a waste ternary positive electrode material is sieved to obtain screen underflow, and the screen underflow comprises nickel-cobalt lithium manganate; the screen underflow is placed in the atmosphere of reducing gas to be subjected to reduction treatment, reduction materials are obtained, and the reduction materials comprise nickel elementary substances, cobalt elementary substances, manganese oxide and lithium oxide; the reduction material is leached, leached slurry is obtained, and the leached slurry comprises solids of nickel, cobalt and manganese oxides and liquid containing lithium ions; the leached slurry is filtered, leached residues are obtained, and the leached residues comprise nickel oxide, cobalt oxide and manganese oxide; and the leaching residues are subjected to water washing treatment, and nick