Experimental Study on Enhanced Leaching of Aluminum and Iron from Red Mud by Synergistic Dual Acids AITranslate

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Chinese Library Classification Number:TD98[矿业工程—选矿]

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To promote the recovery and utilization of aluminum and iron resources from red mud,the lea-ching behaviors of Al and Fe were studied in a dual-acid(H₂SO₄+HCl)system.The effects of dual-acid concentration,volume ratio of sulfuric acid to hydrochloric acid,leaching temperature,liquid-solid ratio,and leaching time on the leaching rates of Al and Fe were systematically investigated.The optimal leaching conditions are determined as follows:total volume fraction of sulfuric acid and hydrochloric acid of 28%,volume ratio of sulfuric acid to hydrochloric acid of 1∶1,leaching temperature of 100℃,liquid-solid ratio of 9 mL/g,and leaching time of 60 min.Under these conditions,the leaching rates of Al and Fe can reach 97.5%and 73.8%,respectively.The dual-acid leaching exhibits effective synergistic effect.Hydrochloric acid can form a stable complex with Fe³⁺,while sulfuric acid provides the necessary acidity and oxidizing ability to promote the dissolution of Al³⁺,which significantly enhances the leaching efficiency of aluminum and iron,and provides a novel approach for the resource utilization of red mud.