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Recovery of Cadmium, Zinc, and Lead from Lead Smelter Flue Dusts

机译：从铅冶炼厂烟尘中回收镉，锌和铅

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The Bureau of Mines has developed a technique to separate and recover the three major components, Pb, Zn, and Cd, from lead smelter flue dust. The laboratory process utilizes sulfation roasting of the flue dust followed by water leaching to extract over 95 pct of the cadmium and zinc. Ninety-nine percent of the cadmium was recovered from solution by cementing with zinc dust, and zinc was electrowon from the resulting solution after purification. Zinc electrolysis was carried out in a 1-liter cell at 35C with a cathode-current density of 8 A/sq dm in a solution containing 65 g/l Zn++ and 180 g/l H2SO4. Current efficiencies of 80 pct were obtained. The leached residue consisted largely of PbSo4, which was converted to PbCO3 and leached with H2SiF6 to produce PbSiF6 electrolyte. Ninety-five percent of the lead contained in the residue was converted to electrolyte. Lead was electrowon from solutions.

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