Tin smelting process recovery of valuable metals
In the electrolytic refining process of the solder, lead chloride precipitate became lead, together with the remaining insoluble antimony, arsenic, bismuth, copper, silver anode mud, iron, indium dissolved in the electrolyte. When the cathode tin is melted, the entrained electrolyte is also evaporated and concentrated on the tin liquid, which is called "oil head". The "oil head" contains indium and tin and can be recovered by solvent extraction. The anode mud is treated by chlorination distillation, and the produced tin dichloride gas is condensed and returned to the electrolyte; the crude lead remaining in the chlorination pot is electrorefined to obtain lead and can be recovered from the lead anode mud. Tin, silver, silver, etc.
The reverberatory furnace dust returns and undergoes secondary reduction smelting to reduce tin and lead to metal, and zinc , indium, cadmium and antimony are concentrated in the secondary soot and recovered therefrom. The molten slag is calcined and returned to the smelting, and the obtained soot is extracted by distillation to extract white arsenic. The copper removal slag is floated to obtain copper concentrate and fine tin product. The copper concentrate is subjected to oxidative roasting, sulfuric acid leaching, and concentrated crystallization to produce crystalline copper sulfate. Some tin mines in China recover bismuth, antimony and tungsten from smelting slag.
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