Method for preparing precursor of nickel-cobalt-aluminum ternary positive-electrode material by utilizing high-temperature alloy waste material

The invention discloses a method for preparing a precursor of a nickel-cobalt-aluminum ternary positive-electrode material by utilizing a high-temperature alloy waste material. The method comprises the following steps: 1, carrying out electrochemical dissolution on high-temperature alloy waste to obtain an electrolyte; 2, carrying out filtration and adsorption treatment on the electrolyte to obtain a mixed solution A; 3, adjusting the nickel-cobalt-aluminum proportion and the pH value in the mixed solution A to obtain a mixed solution B; 4, adding the mixed solution B, ammonia water and a sodium hydroxide solution into a reactor containing a base solution for reaction, so as to obtain a nickel-cobalt-aluminum mixed precipitate; and 5, ageing the mixed precipitate, and performing washing, filtering and drying to obtain the precursor of the nickel-cobalt-aluminum ternary positive-electrode material. The invention aims at the difficult problems that the high-temperature alloy waste recovery is difficult, the cos