机械活化对闪锌矿物化性质及焙烧动力学的影响  

Effect of mechanical activation on physical and chemical properties and roasting kinetics of sphalerite

作　　者：田磊[1] 张廷安[1] 吕国志[1] 刘燕[1] 周双[1] 张伟光[1] 张国权[1] 

机构地区：[1]东北大学多金属共生矿生态化冶金教育部重点实验室,沈阳110819

出　　处：《中国有色金属学报》2015年第12期3535-3542,共8页The Chinese Journal of Nonferrous Metals

基　　金：国家高技术研究发展计划资助项目(2012AA062303);国家自然科学基金资助项目(U1402271);高等学校博士学科点专项科研基金资助项目(20120042110011)

摘　　要：研究机械活化对闪锌矿的物化性质以及焙烧宏观动力学的影响,采用X射线衍射仪、扫描电镜、激光粒度分析仪、比表面积测试仪、热重分析,分析活化前后闪锌矿的晶体结构、表观形貌、粒度和比表面积的变化规律。使用MDTA分析法研究未活化与机械活化闪锌矿在空气气氛下的氧化焙烧宏观动力学。结果表明:机械活化使闪锌矿的物化性质发生明显改变。在焙烧过程中,经过机械活化的闪锌矿氧化速率远大于未活化闪锌矿的。机械活化可显著提高闪锌矿的反应活性。经机械活化30、120 min后,闪锌矿在焙烧过程中的表观活化能由未活化时的239.78 kJ/mol分别降至171.25和57.17 kJ/mol。并计算出其相应的非等温氧化动力学方程。The sphalerite was mechanically activated by a high performance ball,and the physical and chemical properties and roasting kinetics were studied.The effects of the variation in crystalline structure,morphology,panicle size and specific surface area of the non-activated and mechanically activated sphalerite concentrates were characterized by X-ray diffractometry,scanning electron microscopy,thermal analysis,particle size analyzer and volumetric adsorption analyzer,respectively.The roasting macrokinetics of unactivated and mechanically activated were investigated using differential thermal analysis（DTA） in oxygen.The results show that the physicochemical properties of sphalerite are changed obviously by mechanically activation.In the roasting process,the oxidation rate of sphalerite activated sphalerite is much faster than that of non-activated sphalerite.Reaction activity of sphalerite is significantly improved by mechanical activation.When sphalerite is mechanically activated for 30 min and 120 min,the apparent activation energy decreases from 239.78 kJ/mol of non-activated sphalerite to 171.25 and 57.17 kJ/mol,respectively.The corresponding non-isothermal oxidation kinetics equations were calculated.

关 键 词：闪锌矿 焙烧宏观动力学 机械活化 表观活化能 非等温动力学方程 

分 类 号：TF813[冶金工程—有色金属冶金]