不同实验条件下卤水-碱法制备氧化镁的活性研究  

Preparation of Active Magnesium Oxide Powder under Different Conditions by Brine-alkali method

作　　者：赵娜[1] 张琴[1] 翟俊[1] 黄春晖[1] 宗俊[1] 

机构地区：[1]华东师范大学化学与分子工程学院,上海200241

出　　处：《盐业与化工》2015年第9期10-13,共4页Jounral of Salt and Chemical Industry

摘　　要：文章以卤水和烧碱为原料,在80℃下沉淀反应30 min制备氧化镁前驱体。实验通过改变原料摩尔比、反应浓度、反应温度、滴加方式和干燥方式等条件制备氢氧化镁,再经煅烧后得氧化镁粉。所得粉体经XRD、SEM分析,并用柠檬酸活性法探究其活性规律。结论为:当卤水与烧碱的摩尔比约为1∶1.88,80℃水浴中直接沉淀法正向滴加,正丁醇共沸蒸馏法干燥,然后在450℃下煅烧2.5 h烧制出多孔的片状活性氧化镁,其CAA值约为8 s。The magnesium oxide precursor is prepared with the raw material of brine and so- dium hydroxide for 30 minutes at 80 ℃. The reaction temperature, reaction time, reaction concen- tration, drop way and drying methods and so on are studied in the experiment to determine the opti- mal experiment condition. Magnesium oxide is got by heating magnesium hydroxide, which activity is measured by citric acid method. Finally, magnesium oxide＇s morphology characteristics are ana- lyzed by X - ray diffraction （ XRD ） and scanning electron microscope （ SEM ）. The study found that active magnesium oxide of small particle size, high dispersion and porous surface can be pre- pared in the optimal experiment conditions when the molar ratio of brine and caustic soda is about 1 ： 1.88, forward dropping, n- butyl alcohol azeotropic distillation drying and then burning at 450 ℃ for 2.5 h. The active reaction time is about 8 seconds （ CAA = 8 s）.

关 键 词：卤水-烧碱法 活性氧化镁 柠檬酸法 

分 类 号：TQ132.2[化学工程—无机化工]