Method for removing iron from leach liquor at two stages

The invention discloses a method for removing iron from leach liquor at two stages, which comprises the steps of: (a) performing pressurized acid leaching at first stage and neutralizing treatment at second stage on zinc sulfide concentrate; (b) filtering the leach liquor at the two sections to obtain a filtrate; (c) adding the filtrate into a reaction tank, adding a neutralizer with a predetermined content into the filtrate, introducing oxygen, controlling predetermined agitating speed, predetermined reaction temperature, predetermined reaction time and reaction finish pH value to remove the iron in the filtrate and absorb arsenic and antimony in the filtrate for co-precipitation so as to obtain an intermediate liquid supernatant with iron content smaller than or equal to 20mg/L. According to the method, the iron in the filtrate can be adequately removed so as to further reduce the iron content in the intermediate liquid supernatant and absorb the arsenic and the antimony in the filtrate for the co-precipita