以电解法氢氧化镁为原料制备纳米氧化镁  

Preparation of Nano-sized MgO Using Electrolytic Mg(OH)2

作　　者：郭丽莉 涂赣峰 冯乃祥 狄跃忠 GUO Li-li;TU Gan-feng;FENG Nai-xiang;DI Yue-zhong(School of Metallurgy,Northeastern University,Shenyang 110819,China;School of Materials,Yingkou Institute of Technology,Yingkou 115014,China)

机构地区：[1]东北大学冶金学院,辽宁沈阳110819 [2]营口理工学院材料学院,辽宁营口115014

出　　处：《东北大学学报（自然科学版）》2023年第6期783-789,共7页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(21878045).

摘　　要：采用隔膜电解法以盐湖水氯镁石为原料制备前驱体Mg(OH)_(2),煅烧后制备纳米氧化镁,实现盐湖废弃资源的高值化利用.对Mg(OH)_(2)煅烧过程进行热解动力学解析,结合热解机理和速率,考察煅烧条件对MgO性能的影响.结果表明:煅烧温度升高,MgO的比表面积降低,活性先升高后降低,晶粒变大;煅烧时间延长,MgO的比表面积和活性降低,晶粒尺寸增大,结构变得致密;升温速率增大,MgO比表面积与活性均先增大后平缓,晶粒尺寸基本不变;MgO比表面积最大为29.3 m^(2)/g,CAA最小为66 s,晶粒尺寸最小为27.8 nm.The precursor of Mg(OH)_(2)was prepared by diaphragm electrolysis with bischofite in salt lake,and then calcined to obtain nano-sized MgO,so as to realize the high-quality utilization of waste resources.The pyrolysis kinetics of the calcination process of Mg(OH)_(2)was analyzed and the effects of calcination conditions on the MgO properties were investigated,combined with the pyrolysis mechanism and rate.The results show that with increasing calcination temperature,the specific surface area of MgO decreases,the activity firstly increases and then decreases,and the grain size increases.When the calcination time increases,the specific surface area and activity of MgO decreases,the grain size increases,and the structure becomes denser.Furthermore,with the increase of heating rate,the specific surface area and activity of MgO firstly increases and then becomes stable,and the grain size mainly remains unchanged.The maximum specific surface area of MgO is 29.3 m^(2)/g,the minimum CAA is 66 s,and the minimum grain size is 27.8 nm.

关 键 词：氢氧化镁 煅烧 反应动力学 纳米氧化镁 活性 

分 类 号：O614.22[理学—无机化学]