Leaching method of waste lithium ion battery powder

The invention discloses a leaching method of waste lithium ion battery powder, and relates to the technical field of battery recovery. Ferrous sulfate is adopted as a leaching agent, so that main metals and impurities except copper in the battery powder can be leached under mild conditions; the nickel-cobalt slag is used for reducing ferric iron, and the main metal concentration in feed liquid is increased while new impurities are not introduced; aluminum slag is obtained by removing aluminum through bicarbonate, a small amount of ferric ions still exist in the aluminum removal process, and under the synergistic effect of the small amount of ferric ions, the aluminum slag obtained in the aluminum removal process is in a regular disc shape, the aluminum content in the slag is high, the slag amount is small, the solid-liquid separation speed is high, and the metal loss rate is low; iron is removed after the positive powder oxidizes ferrous ions, and purified liquid is obtained. The method is simple in technolog