Method for removing iron by utilizing autoclave during zinc hydrometallurgy production

The invention discloses a method for removing iron by utilizing an autoclave during zinc hydrometallurgy production. The method comprises the following steps of: S1) introducing two-stage leachate obtained by first-stage pressure acid leaching and second-stage pressure neutralization and a neutralizing agent into an autoclave, and introducing an oxidizing agent into the autoclave for forming a mixed solution; S2) controlling the temperature in the autoclave at 65-90 DEG C and controlling the pressure at 0.2-0.5MPa; S3) stirring the mixed solution for a preset period of time at a preset rotational speed; S4) filtering the mixed solution to get a zinc sulfate solution with the iron content of not more than 20mg/l and the pH value at the end point of 5.0-5.2; and S5) performing purification and impurity removal on the zinc sulfate solution. The method for removing the iron by utilizing the autoclave according to the embodiment of the invention has the advantages of simplicity in operation, low consumption of the neutralizing agent, a small quantity of slag, low loss of zinc metal, high metal recovery rate, capability of getting the zinc sulfate solution with the iron content of not more than 20mg/l, no need of steam for heating and effects of saving the steam and reducing energy consumption.