Method for removing impurities of iron and aluminum from sulfuric acid leaching solution of waste ternary lithium battery

The invention discloses a method for removing impurities of iron and aluminum from a waste ternary lithium battery sulfuric acid leaching solution, which comprises the following steps: extracting the waste ternary lithium battery sulfuric acid leaching solution by using an N1923-sec-octanol-sulfonated kerosene mixed extracting agent until the pH value of a water phase end point is 4.1-4.6, and carrying out phase splitting to obtain a loaded organic phase containing iron and aluminum and a raffinate water phase without iron and aluminum. According to the method, main metal Ni < 2 + >, Co < 2 + >, Mn < 2 + > and Li < + > in the waste ternary lithium battery sulfuric acid leaching solution can be completely separated from impurity metal Fe < 3 + > and Al < 3 + >, the removal rate of the impurities Fe < 3 + > and Al < 3 + > in the process is high, the loss rate of the main metal is low, the process is simple, operation is continuous, no extra impurities are introduced, and the method is quite suitable for follow-