Lead is most commonly present in the leaching slag from copper smelting dust as lead sulfate. Sodium carbonate is added into slurry of leaching slag, in which lead sulfate is converted into lead carbonate with lower solubility, and then reduction smelting for leaching slag converted into carbonate is carried out to produce lead bismuth alloy, matte and smelting slag. In this experiment, preliminary optimum process conditions of leaching slag from copper smelting dust converted into carbonate is summarized a...