Sustainable Mining and Metallurgy

In view of the problems of less theoretical experiments and insufficient research on process diversification in the treatment of zinc leaching residue by SO₂ reduction leaching process, the experimental study on the treatment of high-iron acid leaching residue by pre-acidification and SO₂ reduction leaching process was carried out to explore the effect of pre-acidification on the zinc leaching rate of SO₂ reduction leaching, the reaction time of SO₂ reduction leaching section and the sedimentation of pulp after reduction. The results show that the leaching rate of zinc can reach 96% and the reaction time of SO₂ reduction section can be shortened to 1.5h under the conditions of concentrated sulfuric acid concentration of 100g/L, reaction temperature of 90℃ and reaction time of 1.5h. When the concentration of pre-acidified sulfuric acid is 90~110g/L, the slurry sedimentation after reduction is better.