|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||PbZn 2020: The 9th International Symposium on Lead and Zinc Processing
||Refining of Zinc Chloride by the Combination of Cementation Reaction and Vaccuum Distillation
||Gen Kamimura, Hiroyuki Matsuura
|On-Site Speaker (Planned)
In order to develop an efficient recycling process of zinc from electric arc furnace (EAF) dust, several refining methods of crude zinc chloride, which can be produced through selective chlorination and evaporation process of EAF dust, were investigated. In the experiments with cementation reaction using metallic zinc at 723 K, the removal of cadmium from 40mol%ZnCl2-KCl-NaCl melt was focused on, which standard electrode potential is close to that of zinc. Cadmium chloride was effectively removed from molten salt when KCl was added to ZnCl2 rather than NaCl. With two steps of cementation reaction, cadmium was removed to about 10 massppm with adding fewer metallic zinc. In the experiments with vacuum distillation at 800 K, the separation of ZnCl2 from impurities with lower vapor pressures was investigated using a laboratory-scale electric furnace with wide temperature distribution.