亜鉛・鉛製錬の現状と今後の展望

[3K0301-05-04] 四阪製錬所におけるEAFダスト処理技術開発について

○高谷 悟¹、工藤 万雄¹、山本 恵介¹ (1. 株式会社四阪製錬所)

司会：川村 茂（秋田大学）

キーワード：電炉ダスト、亜鉛リサイクル、ウェルツキルンプロセス、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.