Reduction of lead sulfate to lead sulfide with carbon monoxide
来源期刊：中南大学学报(英文版)2015年第8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：2929 - 2935
Key words：lead sulfate; reduction; carbon monoxide; lead sulfide; pyrometallurgy
Abstract: In order to decrease the solubility of PbSO4 and enhance lead recovery from PbSO4 bearing wastes, CO was employed as a reductant to transform PbSO4 into PbS. Reaction system was established and reductive thermodynamics of PbSO4 was calculated by software HSC 5.0. The effects of gas concentration, reaction temperature, time and mass of sample on reduction of PbSO4 were examined by thermogravimetry (TG) and XRD. Roasting tests further verify the conclusions of thermodynamic and TG analyses. The results show that increasing temperature in the reasonable range and CO content are favorable for the formation of PbS. The reduction process is controlled by chemical reaction and calculation value of the activation energy is 47.88 kJ/mol.
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 decrease the solubility of PbSO4 and enhance lead recovery from PbSO4 bearing wastes, CO was employed as a reductant to transform PbSO4 into PbS. Reaction system was established and reductive thermodynamics of PbSO4 was calculated by software HSC 5.0. The effects of gas concentration, reaction temperature, time and mass of sample on reduction of PbSO4 were examined by thermogravimetry (TG) and XRD. Roasting tests further verify the conclusions of thermodynamic and TG analyses. The results show that increasing temperature in the reasonable range and CO content are favorable for the formation of PbS. The reduction process is controlled by chemical reaction and calculation value of the activation energy is 47.88 kJ/mol.
Key words:lead sulfate; reduction; carbon monoxide; lead sulfide; pyrometallurgy
