Studies on the separation and extraction of In from zinc smelting residue by sulphuric acid baking were carried out. A residue from Cd recovering process at Hikoshima smelter was used as the sample, which is composed mainly of Cd, Fe and In, amounting to 1.5%In.
The samples were firstly heated at 300°C with proper amount of sulphuric acid to facilitate sulfatization and then baked at 750°C. This rendered all of Cd water-soluble and the Fe and In, remaining insoluble. Cd-freed residues were again baked by sulphuric acid at 550°C followed by leaching with 0.1 N sulphuric acid. All of the In went into solution with only very small amount of the Fe. In short, the separation of Cd, Fe and In was accomplished nearly quantitatively by sulphric acid baking process.
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