Mechanism of stibnite volatilization at high temperature
来源期刊：中南大学学报(英文版)2015年第3期
论文作者：QIN Wen-qing(覃文庆) LUO Hong-lin(罗虹霖) LIU Wei(刘维) ZHENG Yong-xing(郑永兴) YANG Kang(杨康) HAN Jun-wei(韩俊伟)
文章页码：868 - 873
Key words：stibnite; volatilization; nitrogen; thermogravimetric analysis
Abstract: The volatilization of stibnite (Sb2S3) in nitrogen from 700 to 1000 °C was investigated by using thermogravimetric analysis. The results indicate that in inert atmosphere, stibnite can be volatilized most efficiently as Sb2S3 (g) at a linear rate below 850 °C, with activation energy of 137.18 kJ/mol, and the reaction rate constant can be expressed as k=206901exp(-16.5/T). Stibnite can be decomposed into Sb and sulfur at temperature above 850 °C in a nitrogen atmosphere. However, in the presence of oxygen, stibnite is oxidized into Sb and SO2 gas at high temperature. Otherwise, Sb is oxidized quickly into antimony oxides such as Sb2O3 and SbO2, while Sb2O3 can be volatilized efficiently at high temperature.
QIN Wen-qing(覃文庆), LUO Hong-lin(罗虹霖), LIU Wei(刘维), ZHENG Yong-xing(郑永兴), YANG Kang(杨康), HAN Jun-wei(韩俊伟)
(School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China)
Abstract:The volatilization of stibnite (Sb2S3) in nitrogen from 700 to 1000 °C was investigated by using thermogravimetric analysis. The results indicate that in inert atmosphere, stibnite can be volatilized most efficiently as Sb2S3 (g) at a linear rate below 850 °C, with activation energy of 137.18 kJ/mol, and the reaction rate constant can be expressed as k=206901exp(-16.5/T). Stibnite can be decomposed into Sb and sulfur at temperature above 850 °C in a nitrogen atmosphere. However, in the presence of oxygen, stibnite is oxidized into Sb and SO2 gas at high temperature. Otherwise, Sb is oxidized quickly into antimony oxides such as Sb2O3 and SbO2, while Sb2O3 can be volatilized efficiently at high temperature.
Key words:stibnite; volatilization; nitrogen; thermogravimetric analysis
