Sulfidation roasting of lead and zinc carbonate with sulphur by temperature gradient method
来源期刊：中南大学学报(英文版)2015年第5期
论文作者：ZHENG Yong-xing LIU Wei QIN Wen-qing JIAO Fen HAN Jun-wei YANG Kang LUO Hong-lin
文章页码：1635 - 1642
Key words：lead and zinc carbonate; sulphur; roasting; temperature gradient; pyrometallurgy
Abstract: In order to enhance the lead and zinc recovery from the refractory Pb-Zn oxide ore, a new technology was developed based on sulfidation roasting with sulphur by temperature gradient method. the solid-liquid reaction system was established and the sulfidation thermodynamics of lead and zinc carbonate was calculated with the software HSC 5.0. The effects of roasting temperature, molar ratio of sulphur to lead and zinc carbonate and reaction time in the first step roasting, and holding temperature and time in the second roasting on the sulfidation extent were studied at a laboratory-scale. The experimental results show that the sulfidation extents of lead and zinc are 96.50% and 97.29% under the optimal conditions, respectively, and the artificial galena, sphalerite and wurtzite were formed. By the novel sulfidizing process, it is expected that the sulphides can be recovered by conventional flotation technology.
ZHENG Yong-xing(郑永兴), LIU Wei(刘维), QIN Wen-qing(覃文庆), JIAO Fen(焦芬), HAN Jun-wei(韩俊伟), YANG Kang(杨康), LUO Hong-lin(罗虹霖)
(School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China)
Abstract:In order to enhance the lead and zinc recovery from the refractory Pb-Zn oxide ore, a new technology was developed based on sulfidation roasting with sulphur by temperature gradient method. the solid-liquid reaction system was established and the sulfidation thermodynamics of lead and zinc carbonate was calculated with the software HSC 5.0. The effects of roasting temperature, molar ratio of sulphur to lead and zinc carbonate and reaction time in the first step roasting, and holding temperature and time in the second roasting on the sulfidation extent were studied at a laboratory-scale. The experimental results show that the sulfidation extents of lead and zinc are 96.50% and 97.29% under the optimal conditions, respectively, and the artificial galena, sphalerite and wurtzite were formed. By the novel sulfidizing process, it is expected that the sulphides can be recovered by conventional flotation technology.
Key words:lead and zinc carbonate; sulphur; roasting; temperature gradient; pyrometallurgy
