由硫酸镁铵溶液制备Mg(OH)_2的实验研究

Preparation of Mg( OH)_2 using ammonium magnesium sulfate solution

以含NH_4^+、Mg^(2+)和SO_4^(2-)的溶液为原料,采用氨气调pH值,得到Mg(OH)_2沉淀。实验得到反应温度、反应时间、终点pH值和搅拌强度等因素与镁的提取率的关系。采用正交试验得到影响镁的沉淀率的各种因素顺序为:反应温度>终点pH值>反应时间>搅拌强度。优化的工艺条件为反应温度30℃、反应时间60分钟以上、终点pH值11以上、搅拌强度400r·min^(-1)。

NH3 gas was added into the solution that containing NH4^+,Mg^2+,SO4^2-for adjusting the pH value of the solution.Mg(OH)2 deposit was gained.The relations of magnesium's extraction rate and reaction temperature,reaction time,pH value,stirring intensity were studied.The order of influence factors for extraction rate of magnesium is reaction temperature>pH value>reaction time>stirring intensity through orthogonal experiment.The optimized process condition is reaction temperature of 30℃,reaction time of more than 60min,pH value of more than 11,stirring intensity of 400r·min^-1.