Mechanism of stibnite volatilization at high temperature  

作　　者：覃文庆 罗虹霖 刘维 郑永兴 杨康 韩俊伟 

机构地区：[1]School of Minerals Processing and Bioengineering, Central South University

出　　处：《Journal of Central South University》2015年第3期868-873,共6页中南大学学报（英文版）

基　　金：Project(51204210) supported by the National Natural Science Foundation of China;Project(2011AA061001) supported by the National High Technology Research and Development Program of China;Project(2012BAC12B04) supported by the National Science&Technology Pillar Program during Twelfth Five-Year Plan of China

摘　　要：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 below850 °C, with activation energy of 137.18 k J/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 Sb O2, while Sb2O3 can be volatilized efficiently at high temperature.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 below850 °C, with activation energy of 137.18 k J/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 Sb O2, while Sb2O3 can be volatilized efficiently at high temperature.

关 键 词：stibnite volatilization nitrogen thermogravimetric analysis 

分 类 号：TF818[冶金工程—有色金属冶金]