轻烧氧化镁水化动力学  

Hydration dynamic of light-burned magnesia

作　　者：钱海燕[1] 李素英[1] 邓敏[1] 张少明[1] 

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京210009

出　　处：《化工矿物与加工》2007年第12期1-4,共4页Industrial Minerals & Processing

基　　金：江苏省自然科学基金(BK2001099)。

摘　　要：研究了不同温度下轻烧氧化镁试样和70℃碱性溶液中氧化镁的水化程度和水化时间的关系。并通过测定悬浮液的离子积常数对结果进行分析。实验表明,在不加添加剂的情况下,氧化镁的水化程度随水化时间的延长呈明显增长的趋势;加入不同的碱性添加剂,水化反应早期的水化程度有所提高,水化反应中后期的水化程度增长缓慢。OH^-的加入有利于溶液离子积常数的提高,轻烧氧化镁水化过程是化学反应控制,可用方程a=1-exp(-kt)表示,氧化镁水化反应活化能为59.2 kJ/mol。The relationship of hydration degree and time of lightburned magnesia sample at different temperature and in alkali solutions at 70℃ was investigated and the experiment result was analyzed by measuring ion product constant of MgO suspension in this paper. The experiment indicated that magnesia＇s hydration degree increased with hydration time in the condition of no additives. Adding different alkali additives, the hydration degree was improved at initial stage; the increasing extent was little at middle and later stage. Adding OH^- was favourable to improve solution＇s ion product constant. Magnesia hydrated rate was controlled by chemical reaction. Magnesia hydration activation energy was 59.2kJ/mol.

关 键 词：氧化镁 水化 碱性助剂 动力学 

分 类 号：TQ110.3[化学工程—无机化工]