HYDROMETALLURGICAL PROCESS FOR TREATING ZINC-CONTAINING DUST FROM ELECTRIC STEEL OVENS

摘要

Zinc-contg. dust, from electric steel making furnaces, is leached with caustic soda to extract the zinc, pref. in two stages, the first stage employing a relatively weak (pref. 200-250 g/l) caustic soda soln. to leach zinc oxide and the second stage employing a more concentrated (250-2000 g/l) caustic soda soln. to leach zinc ferrite. Use of a basic leaching soln. causes the iron in the dust to be pptd. as ferric hydroxide, thus simplifying sepn. of iron.