Abstract
Shisaka Smelting Co., Ltd. has recovered crude zinc oxide from electric arc furnace (EAF) dust using the Waelz kiln process since 1977. When the operation started, malfunctions frequently occurred in a granulation process which was previous process of a reduction roasting process. We stopped this process and shifted to the process directly charging EAF dust in the reduction rotary kiln. As a result, we had been weak in treating high-zinc EAF dust for a long time. To improve the disadvantage, we introduced a new granulation process which is off-line in 2011. Thereby, zinc recovery rate in reduction rotary kiln greatly increases and the capacity treating high-zinc EAF dust reaches 50,000 tons per year.
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