煅烧温度对天然水菱镁矿结构性能的影响  

Effects of Calcining Temperature on Performance of Natural Hydromagnesite

作　　者：田海山[1] 刘立新[1] 孙志明[1] 柴滢[1] 郏梦子 郑水林[1] 

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《非金属矿》2017年第1期71-74,共4页Non-Metallic Mines

基　　金：中央高校基本科研业务费项目(2010YH10;2015QH01)

摘　　要：以产自我国西藏班戈湖地区的天然水菱镁矿为研究对象,采用X射线衍射技术、扫描电子显微技术、比表面积及孔径分布分析,研究煅烧温度对天然水菱镁矿的结构特征及调湿性能的影响。结果表明:随着煅烧温度的升高,物相主要由水菱镁矿(<200℃)、非晶态镁化合物(200~300℃)向方镁石(>400℃)发生转变,同时伴随着气体的逸出,形貌也发生明显变化;当煅烧温度为400℃时,由于晶体结构破坏及气体逸出生成的纳米级活性氧化镁具有特殊的介孔结构,比表面积达到132.445 m2/g,平衡吸湿量可达14.05%。X-ray diffraction, scanning electron microscopy, surface area and pore size distribution were carried out in order to study the effects of calcining temperature on structural characteristics and humidity control performance of natural hydromagnesite from Bangor lake area in Tibet, China. The results indicate that the phase transform from hydromagnesite （〈200 ℃）, amorphousmagnesium compound （200-300℃） to periclase （〉400℃）. Meanwhile, the morphology changed significantly with the gas evolution. Particularly, when the calcining temperature is 400℃, the products （active magnesium oxide） produced from crystal structure breaking and gas evolution have special mesopore structure. The surface area reached 132.445 m2/g and balanced moisture content was up to 14.05%.

关 键 词：水菱镁矿 煅烧温度 结构特征 调湿性能 

分 类 号：TD985[矿业工程—选矿]