Abstract: In the process of zinc smelting，waste water，waste gas and waste residue are produced. The waste water mostly contains heavy metals such as arsenic，mercury and zinc.The waste gas contains toxic gases such as sulfur dioxide and nitrogen oxide，and the waste residue contains heavy metals such as zinc，arsenic and cadmium.The direct discharge of the above "three wastes" dose not meet the requirements of environmental protection and pollutes the environment at the same time. In order to solve the prob⁃ lem of "three wastes" treatment in a zinc smelting enterprise in Xinjiang and realize the green metallurgy process，based on the comparative analysis of the existing waste removal process，the biological agent meth⁃ od is used to treat waste acid wastewater，and zinc oxide desulfurization method is used to treat waste gas， rotary kiln slag treatment method is used to treat waste residue，and carry out green smelting of heavy metal cadmium slag. Finally，zero waste water discharge can be realized，the exhaust gas SO₂ emission index is less than 100 mg/Nm³，and the waste slag can realize harmless.The cadmium content in the exhaust gas of cadmium smelting is less than 0.85 mg/Nm³，which achieve the double benefits of environmental protection and economy.

Key words: zinc smelting, waste water, waste gas, waste residue