亜鉛・鉛製錬の現状と今後の展望

[1K62101-06-05] 四阪製錬所における最近のEAFダスト処理技術開発について

○高谷 悟¹、窪田 直樹¹、山本 恵介¹、工藤 万雄¹ (1. 株式会社四阪製錬所)

キーワード：EAFダスト、亜鉛リサイクル、ウェルツキルン、造粒

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.