Production Process of Zinc Metal from Electric Arc Furnace Dust

采用碳或金属铁对氧化钙处理后的电炉粉尘中的氧化锌进行还原，作为回收粉尘中金属锌的可选工艺。样品为6克石灰加成反应产物与碳在ZnO/C或ZnO/Fe=1摩尔比下的混合物。该混合物在1000至1100°C氩气流或真空中加热给定时间。加热后沉积在装置冷却部位的凝结物通过XRD和ICP进行了收集和分析。利用石灰加成过程的反应产物还原氧化锌的实验结果表明，本工作成功地获得了纯金属锌。在Waelz工艺中，产物是含有大量卤素的粗氧化锌，而CaO处理后的粉尘基本不含卤素。如果精确控制冷却部分的温度，用铁还原CaO处理过的粉尘来收集液态纯锌是可能的。

Reduction of ZnO in EAF dust after the treatment with CaO by carbon or metallic iron was conducted as an optional technology for metallic Zn recovery from the dust. The specimens were six gram mixture of the reaction product from lime addition process and carbon at ZnO/C or ZnO/Fe=1/1 in molar ratio. This mixture was heated for given period at 1000 to 1100°C in Ar flow or vacuum. After heating, the condensed matters deposited on the cooling part in the apparatus was collected and analyzed by XRD and ICP. The experimental result of ZnO reduction process using the reaction products from lime addition process showed that pure metallic Zn was successfully obtained in the present work. In the Waelz process, the product is crude ZnO containing significant amount of halogens while the CaO treated dust is basically halogen-free. It may be possible to collect liquid pure zinc by the reduction of CaO treated dust with iron if the temperature of cooling part is precisely controlled.