Abstract
Slag from a zinc cathode melting furnace contains about 60% metallic zinc. This may be increased to 80–90% in the coarse size fractions (+200 mesh) by grinding and sieving. Residual zinc oxide may be removed by leaching with 5% H 2SO 4. Zinc recovery is about 77–84%. The zinc from the coarse size fractions may be melted for ingot production, whilst the finer material is suitable for cadmium cementation (−200 mesh material is similar to zinc dross). The process has been studied on both the laboratory and plant scales and process engineering indicates that it is economic.
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