不同白云石掺量的高镁磷尾矿热处理动力学研究  

Study on kinetics of heat treatment on high-magnesium phosphate tailings with different dolomite content

作　　者：崔玉格 张豪 郭今锴 王雨琦 杜本康 薛俊[1,2] Cui Yuge;Zhang Hao;Guo Jinkai;Wang Yuqi;Du Benkang;Xue Jun(Wuhan Institute of Technology Materials Science and Engineering,Wuhan Hubei 430205,China;National Research Center of Phosphorus Resources Development and Utilization Engineering Technology,Wuhan Hubei 430074,China)

机构地区：[1]武汉工程大学材料科学与工程学院,湖北武汉430205 [2]国家磷资源开发利用工程技术研究中心,湖北武汉430074

出　　处：《化工矿物与加工》2023年第6期65-70,共6页Industrial Minerals & Processing

基　　金：国家科技支撑计划项目(2013BAB07B05);湖北省自然科学基金项目(2014CFB788)。

摘　　要：为了给高镁磷尾矿煅烧提供动力学理论指导,以白云石矿粉和低品位高镁磷矿粉为原料,通过调整二者的掺量,模拟不同矿产区的高镁磷尾矿,对其进行热重-差示扫描量热法(TG-DSC)测试,利用Flynn-Wall-Ozawa法、Kissinger法、Satava-Sestak法分别对白云石非等温热分解进行计算分析,结果表明:相同白云石掺量的高镁磷尾矿煅烧时,升温速率越快,白云石热分解的起始温度和结束温度越高,白云石热分解的驱动力越大,分解速率越快;磷尾矿中白云石热分解遵循三维扩散机理,活化能为106.48 kJ/mol,指前因子为9.46×10^(5);基于研究成果,建立了磷尾矿热分解动力学模型,为悬浮煅烧高镁磷尾矿提供了理论基础。In order to provide kinetic theory guidance for the calcination of high-magnesium phosphate tailings,the fine dolomite ore sample and low-grade phosphate ore containing high magnesium were used as raw materials,and the mixing ratio of both ore sample was altered to prepare the high-magnesium phosphate tailings from different regions for conducting the TG-DSC tests on them,and the non-isothermal thermal decomposition of dolomite was calculated and analyzed by using Flynn-Wall-Ozawa method,Kissinger method and Satava-Sestak method,The results show that when high-magnesium phosphate tailings with the same content of dolomite was calcined,the higher the heating rate,the higher the starting and ending temperatures required for thermal decomposition of dolomite,the greater the force of dolomite thermal decomposition and the faster the decomposition works.It is found that the thermal decomposition of dolomite in phosphate tailings follows a three-dimensional diffusion mechanism with activation energy of 106.48 kJ/mol and a pre exponential factor of 9.46×10^(5).Based on research results,a thermal decomposition kinetics model of phosphate tailings was established and provided as theoretical basis for suspension calcination of high-magnesium phosphate tailings.

关 键 词：高镁磷尾矿 白云石 热分解 动力学 升温速率 活化能 悬浮煅烧 

分 类 号：TD926.4[矿业工程—选矿]