(1. 中南大學(xué) 化學(xué)化工學(xué)院， 長沙 410083；
2. 長沙理工大學(xué) 化學(xué)系， 長沙 410077)
摘 要: 用Calvet型微量熱計(jì)對(duì)不同條件下機(jī)械活化閃鋅礦進(jìn)行了量熱實(shí)驗(yàn)， 并對(duì)量熱前后的活化閃鋅礦進(jìn)行透射電鏡（TEM）、 X射線衍射（XRD）及激光粒度測(cè)試。 結(jié)果表明： 閃鋅礦經(jīng)機(jī)械活化后， 在量熱過程中存在能量釋放； 隨著活化時(shí)間的增加， 能量釋放依次增加；在不同氣氛下， 機(jī)械活化閃鋅礦能量釋放基本一致。 量熱前后其晶體結(jié)構(gòu)不變， 但能量釋放后顆粒變粗， 細(xì)粒子明顯減少， 表面積減小， 初步認(rèn)為該能量釋放是由于溫度升高導(dǎo)致細(xì)粒子團(tuán)聚，表面積減少而引起的。
關(guān)鍵字: 機(jī)械活化； 閃鋅礦； 量熱； 能量釋放
（1. College of Chemistry and Chemical Engineering,
Central South University, Changsha 410083, China;
2. Chemistry Department, Changsha University of Science and Technology, Changsha 410077, China）
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.
Key words: mechanically activated; sphalerite; calorimetry; the releasing energy
