Method for recycling iron and aluminum in nickel-cobalt-manganese solution

A method for recycling iron and aluminum from a nickel-cobalt-manganese solution, comprising the following steps:

• performing leaching and copper removal on a battery powder to obtain a copper-removed solution, and removing iron and aluminum by adjusting a pH value in stages to obtain a goethite slag and an iron-aluminum slag respectively;
• wherein the removing iron and aluminum by adjusting a pH value in stages comprises:
• adding a neutralizer, controlling the pH value to 2-4, and heating for a reaction, to obtain the goethite slag;
• and adding a neutralizer, adjusting the pH value to 4-5, and heating for a reaction, to obtain the iron-aluminum slag and an iron-removed solution;
• wherein the goethite slag is washed and dried to obtain a goethite product;
• mixing the iron-aluminum slag with an alkaline solution, and heating and stirring, to obtain an aluminum-containing solution and an alkaline residue;
• and
• heating and stirring the aluminum-containing solution, introducing carbon dioxide, and controlling the pH value to 9.5-11.5, ending the reaction when the pH value is stable, to obtain aluminum hydroxide and an aluminum-removed solution;
• wherein after the aluminum-containing solution and the alkaline residue are obtained, the method further comprises:
• returning the alkaline residue to an acid leaching procedure;
• and the aluminum-removed solution is used as the neutralizer and returned to a system for removing iron and aluminum in stages.