Zinc hydrometallurgy is the main zinc smelting process in the world. The leaching residues produced by different hydrometallurgical processes have different components, but usually contain valuable metals such as zinc, lead, and silver. In China, the slag is defined as hazardous waste, which needs to be treated harmlessly while recovering valuable metals. This paper introduces the process of treating zinc residue by side-submerged combustion furnace and fuming furnace developed by ENFI and makes a detailed comparison with rotary kiln, top-submerged lance smelting furnace, and fuming furnace which are used in the China.
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