Solution behavior of ZnS and ZnO in eutectic Na_2CO_3-NaCl molten salt used for Sb smelting  

作　　者：YE Long-gang HU Yu-jie XIA Zhi-mei TANG Chao-bo CHEN Yong-ming TANG Mo-tang 叶龙刚;胡宇杰;夏志美;唐朝波;陈永明;唐谟堂

机构地区：[1]School of Metallurgical Engineering, Hunan University of Technology [2]School of Metallurgy and Environment, Central South University

出　　处：《Journal of Central South University》2017年第6期1269-1274,共6页中南大学学报（英文版）

基　　金：Projects(51104128,51234009)supported by the National Natural Science Foundation of China

摘　　要：The solution behavior, including solubility, reactivity and sedimentation, of ZnO and ZnS in a Na₂CO₃−NaCl molten salt used for Sb smelting was investigated in the temperature range of 700-1000 ºC. The saturated amount of dissolved ZnO in the molten salt remained constant at 0.02% and was unaffected by temperature; additionally, ZnO did not react with the molten salt. In contrast, the saturated amount of dissolved ZnS in the eutectic molten salt increased with increasing temperature, and the content of ZnS was 0.53% at 1000 ºC. In addition, ZnS reacted with Na₂CO₃ above 900 ºC to give ZnO. The sedimentation rates of these three species in the molten salt followed the order of Sb>ZnS>ZnO. It was thus concluded that ZnO is an appropriate sulfur-fixing agent for low-temperature Sb smelting in a Na₂CO₃−NaCl molten medium, and that the optimal smelting temperature is below 900 ºC.The solution behavior, including solubility, reactivity and sedimentation, of ZnO and ZnS in a Na_2CO_3-NaCl molten salt used for Sb smelting was investigated in the temperature range of 700-1000 oC. The saturated amount of dissolved ZnO in the molten salt remained constant at 0.02% and was unaffected by temperature; additionally, ZnO did not react with the molten salt. In contrast, the saturated amount of dissolved ZnS in the eutectic molten salt increased with increasing temperature, and the content of ZnS was 0.53% at 1000 oC. In addition, ZnS reacted with Na_2CO_3 above 900 oC to give ZnO. The sedimentation rates of these three species in the molten salt followed the order of Sb>ZnS>ZnO. It was thus concluded that ZnO is an appropriate sulfur-fixing agent for low-temperature Sb smelting in a Na_2CO_3-NaCl molten medium, and that the optimal smelting temperature is below 900 oC.

关 键 词：solubility MOLTEN salt sulfur-fixing SMELTING SEDIMENTATION 

分 类 号：TF818[冶金工程—有色金属冶金]