Abstract: The thermal behavior of mechanically activated sphalerite during ageing was investigated by calorimetry, TEM, XRD and particle size analysis. The calorimetric results indicate that mechanically activated sphalerite can release the storage energy during calorimetric process. The amount of releasing energy increases with the grinding time and almost remains constant after grinding for a certain time. The release of energy is independent of grinding atmosphere. XRD results show that there is a great difference of microstructure between activated and non-activated sphalerite but the microstructure remains the same after the activated sphalerite is heated in calorimeter for the measurement of the releasing energy. The TEM test shows that particle size of the activated sphalerite becomes larger at heated in calorimeter. Therefore it can be concluded that the releasing energy come from the decrease of the specific surface energy.
Calorimetric study of mechanically activated sphalerite
Abstract:
The thermal behavior of mechanically activated sphalerite during ageing was investigated by calorimetry, TEM, XRD and particle size analysis. The calorimetric results indicate that mechanically activated sphalerite can release the storage energy during calorimetric process. The amount of releasing energy increases with the grinding time and almost remains constant after grinding for a certain time. The release of energy is independent of grinding atmosphere. XRD results show that there is a great difference of microstructure between activated and non-activated sphalerite but the microstructure remains the same after the activated sphalerite is heated in calorimeter for the measurement of the releasing energy. The TEM test shows that particle size of the activated sphalerite becomes larger at heated in calorimeter. Therefore it can be concluded that the releasing energy come from the decrease of the specific surface energy.