Zinc production from steelworks fly ash comprises extraction of zinc oxide by caustic soda with precipitation of zinc hydroxide and elimination of halogens

摘要

The zinc production from steelworks fly ash has extraction of zinc oxide from electric arc furnace fly ash by caustic sosa, at 95-112 degrees C. Alternatively acid can be used in the highly selective precipitation of zinc hydroxide from the caustic liquid, by hydrolysis of a zincates complex with water. The zinc oxide (92-95 per cent) stable composition is free of halogens.