TG-DSC联用技术在磷矿石热分解上的应用  

Application to the thermal decomposition of phosphate ore with TG and DSC

作　　者：王志颖[1] 马林转[1] 黄超[1] 

机构地区：[1]云南民族大学民族药资源化学国家民委-教育部重点实验室,云南昆明650500

出　　处：《云南民族大学学报（自然科学版）》2014年第1期35-38,共4页Journal of Yunnan Minzu University:Natural Sciences Edition

基　　金：国家自然科学基金(51062018);云南民族大学大学生SRT创新性实验项目(2011HX04)

摘　　要：运用TG—DSC联用技术研究了磷矿石的热分解过程，得到了磷矿石在不同粒度、不同升温速率下的TG—DSC曲线．结果显示磷矿石在40～1100℃范围内可分为4次失重阶段；随着粒度的减小。TG曲线中的失重阶段更为明显和彻底，DSC曲线的吸热峰更为尖锐；随着升温速率的提高，磷矿石热解段起始和终止温度向高温侧移动，且失重率也有增大的趋势；使用Ozawa法计算了磷矿石在600～800℃吸热分解过程的活化能，平均值为202．80kJ/mol，为磷矿石的资源化利用提供依据．The thermal decomposition process of phosphate ore was studied by using Thermogravimetric （TG） and Differential Scanning Calorimetric （DSC）. The TG-DSC curves reveal the features of different sizes and different heating rates . The result showed that phosphate ore had four weight loss stages at the range of 40-1 100 ℃. With the particle＇s size decreasing, the third weight loss stage becomes more obvious in TG curves and the endothermic peak becomes sharper in DSC curve; the starting and ending temperatures of the thermal decomposition process move to a higher degree and the weight loss rate also trends to increase; the activation energy of phosphate ore in the endothermic decomposition process has been calculated by Ozawa method in 600--800 ℃, and the average is 202.80 kJ / mol, which provides a basis for the utilization of phosphate ore.

关 键 词：TG—DSC 磷矿石 活化能 

分 类 号：TD927[矿业工程—选矿]