热处理强化煤系黄铁矿磁性的研究  

Study of magnetic enhancement of coal-derived pyrite by pyrolysis

作　　者：焦红光[1] 李沙[1] 王灿[1] 陈清如[2] 

机构地区：[1]河南理工大学材料科学与工程学院,河南焦作454003 [2]中国矿业大学化工学院,江苏徐州221116

出　　处：《中国矿业大学学报》2011年第3期459-463,共5页Journal of China University of Mining & Technology

基　　金：河南省重点科技攻关项目(072302190002);河南省高校科技创新人才基金项目(2009HASTIT020);煤炭加工与高效洁净利用教育部重点实验室开放基金项目(CPEUKF08-03)

摘　　要：采用自制热处理装置对宜洛结核状煤系黄铁矿进行热处理,热处理温度200~800℃,氮气流量0.1 L/min,保温时间10 min.试验结果表明：热处理温度为700℃时煤系黄铁矿比磁化率达到最大值,与未热处理试样相比提高两个数量级以上,煤系黄铁矿失重速率较大的温度段与其磁性显著增强的温度段基本一致,证明煤系黄铁矿的热分解是其磁性增强的主要原因;XRD分析结果表明600℃时试样中有磁黄铁矿生成,700℃时试样中黄铁矿完全转变为磁黄铁矿;热处理温度与煤系黄铁矿比磁化率之间符合高斯曲线的函数关系.Yiluo nodular coal-derived pyrite was pyrolyzed in a self-designed pyrolysis instrument under different pyrolysis temperatures from 200 to 800 ℃.The Nitrogen flow rate and the holding time were 0.1 L/min and 10 minutes respectively.The results show that： the magnetic susceptibility reached maximum value at 700 ℃ and increased more than two magnitude as well as no heat treatment;the temperature section of the larger weight loss rate is in accordance with that of the significant magnetism enhancement,which show that the thermal decomposition of the pyrite is the main reason for the magnetic enhancement.The pyrrhotite started forming when temperatures were between 600 ℃ and 700 ℃,and the pyrite was completely converted into pyrrhotite at 700 ℃.The heat treatment temperature and the susceptibility values of pyrite accord with gaussian curves.

关 键 词：热处理 煤系黄铁矿 比磁化率 磁性 

分 类 号：TD94[矿业工程—选矿]