Method for intensively leaching iron complex phase in zinc oxygen pressure slag

The invention discloses a method for intensively leaching an iron complex phase in zinc oxygen pressure slag. The method comprises the following steps: grinding zinc oxygen pressure slag, and carrying out proportioning according to the mass ratio of the zinc oxygen pressure slag to concentrated sulfuric acid to sulfate being 1:(0.1-2):(0-1.0); uniformly mixing the ingredients, and carrying out roasting at 200-400 DEG C for 0.5-5 hours; and leaching roasted materials through a sulfuric acid solution at the temperature of 30-100 DEG C, wherein the concentration of the sulfuric acid solution is 0-10 wt%, the solid-to-liquid ratio (g/mL) is 1:4-1:10, and the leaching time is 0.5-4 h; and carrying out filtering, and entering an iron element into the solution. According to the method, the iron complex phase in zinc oxygen pressure can be intensively leached, the leaching rate of iron is larger than or equal to 80%, and the method has the advantages of being high in recovery rate, easy and convenient to operate, low