摘要
模拟了煤矿井酸性水环境,以三价铁离子为氧化剂对不同粒径的煤系黄铁矿样品进行了氧化溶解动力学实验研究,对实验过程进行了pH,Eh及γ(电导率)在线监测.结果表明,在不同粒径反应体系中随着固-液相反应的进行,pH及Eh值呈下降趋势,说明黄铁矿的氧化产酸和消耗氧化剂的过程;电导率值表现为先升后降,表明反应前期主要是溶解氧化反应,后期发生了氢氧化铁共沉淀反应.对于煤系纯度较低的黄铁矿在液相中的氧化反应,平均反应速率与矿物颗粒粒径倒数成正比,即颗粒小的黄铁矿易氧化,产酸快.
The oxidation kinetic behavior in pyrite of different sizes from coal mine with an acid water environment was investigated by using Fe3+ as the oxidant. The online measurement of pH, Eh, andγ(electric conductivity) shows that, with the progress of solid-liquid reaction, the pH and Eh in different size systems have a decrease tendency, indicating that the oxidation reaction of pyrite is dominant at first and the co-precipitation of ferric hydroxide is dominant late. The average oxidation reaction rate of impure pyrite from coal-bearing measures is inversely proportional to particle size of minerals; namely, fine particle pyrite is oxidized easily, and so forms acid quickly.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2004年第6期641-645,共5页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(40272128)教育部优秀博士基金项目(200045)安徽省教育厅自然科学基金项目(2004kj104zd)
