Abstract
Oxide fraction of zinc ash originating from hot dip galvanizing plant was investigated. Chemical and phase compositions of the material were characterized in details. The zinc ash contained simonkolleite, zinc oxide and metallic zinc as main phases. Influence of solid to liquid ratio (150–500 kg/m3) and sulphuric acid concentration (20% and 25%) on dissolution of zinc and metallic impurities was investigated. 95–97% zinc recovery was obtained for 150–200 kg/m3 in 20% H2SO4, but the solutions were contaminated mainly by Mn(II) and Fe(II, III) ions. Acid leaching of the zinc ash was accompanied by exothermic effects. Precipitation purification of the leach liquor from iron ions was followed by zinc electrowinning. Final product of 99.5% purity at a current efficiency of 92% was obtained.
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