TG-DSC联用技术在磷矿石热分解上的应用

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40¹ 100℃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6001 100℃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600⁸00℃吸热分解过程的活化能,平均值为202.80 kJ/mol,为磷矿石的资源化利用提供依据.

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

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.