Chloride removal from zinc ash


Sahin F. , DERIN B. , Yucel O.

Scandinavian Journal of Metallurgy, vol.29, no.5, pp.224-230, 2000 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 29 Issue: 5
  • Publication Date: 2000
  • Doi Number: 10.1034/j.1600-0692.2000.d01-26.x
  • Title of Journal : Scandinavian Journal of Metallurgy
  • Page Numbers: pp.224-230
  • Keywords: zinc ash, roasting, alkali washing, Na2CO3 addition, solid/liquid ratio, chloride removing, RECOVERY, DUST

Abstract

Zinc ash generated during the galvanising of steel and iron contains appreciable amount of zinc in the form of metallic zinc, zinc oxide, zinc chloride and zinc oxy-chloride. The chloride removal from zinc ash is very important for producing zinc metal or zinc oxide. In this study, 3 different types of ash containing varying levels of chloride have been subjected, to 3 types of treatments. Various parameters, such as roasting temperature and time, alkali washing temperature and time, solid/liquid ratio and alkali addition, have been studied. Based on the laboratory-scale experiments. large-scale operations have been carried out for chloride removal from the zinc ash. The results indicate that pyrometallurgical roasting followed by alkali wash treatment with sodium carbonate of the ash will be useful in the removal of chloride from zinc ash.