水合氯化镁焙烧得到的氧化镁的水化研究  

Research on hydration of magnesium oxide from roasting hydrated magnesium chloride

作　　者：冯刚[1] 孙庆国[1] 

机构地区：[1]中国科学院青海盐湖研究所

出　　处：《无机盐工业》2008年第4期15-18,共4页Inorganic Chemicals Industry

摘　　要：通过正交试验,考察反应温度、反应时间、氧化镁与反应液的固液比、水化剂对水合氯化镁焙烧得到的氧化镁水化的影响。采用X射线衍射、扫描电子显微镜、氮气吸附来表征产品。实验结果表明,氧化镁水化的最优组合是:反应温度为90℃,反应时间为4 h,固液质量体积比为0.1 g/mL,水化剂采用氯化镁。水化剂、反应温度和反应时间对氧化镁水化的影响较大。反应温度升高,氧化镁的水化率增加;反应时间越长,氧化镁的水化率越高。反应温度对比表面积的影响比反应时间的影响大,而且70℃时得到的产品的比表面积最大,90℃时次之,50℃时最小。在常压条件下通过氧化镁水化制备高质量的氢氧化镁是比较困难的。In this study, the effects of temperature, time, solid to liquid ratio of magnesium oxide to reaction solution and hydrating agents on the hydration of magnesium oxide from roasting hydrated magnesium chloride were investigated by means of an orthogonal test. X - ray diffraction, scanning electron microscopy and nitrogen absorption were employed to characterize the products. The experiment results showed that the combinatorial optimization of magnesium oxide hydration is ： temperature =90 ℃ ,time =4 h,solid to liquid ratio of magnesium oxide to reaction solution =0. 1 g/mL and magnesium chloride as hydrating agent. Hydrating agent, reaction temperature and time have greater effect on hydration of magnesium oxide. The degree of hydration increased with an increase in temperature. Moreover,the longer the time is, the higher the hydration rate is. The effect of reaction temperature on specific surface area is larger than reaction time. The product obtained at 70 ℃ has the largest specific surface area,which get smaller at 90 ℃ ,and the smallest at 50 ℃. It is hard to prepare high quality magnesium hydroxide by hydration of magnesium oxide at atmospheric pressure.

关 键 词：水合氯化镁 氧化镁 水化 正交试验 

分 类 号：TQ132.2[化学工程—无机化工]