SO4^2-对电沉积法制备氢氧化镁的影响

Effect of SO4^2- on Preparation of Magnesium Hydroxide by Electrode Position

以海绵钛副产品氯化镁为原料,采用水溶液电沉积法制备氢氧化镁时,氢氧化镁团聚严重,且在极板上脱落困难.通过向电解液中加入适量SO4^2-来优化氢氧化镁分散性,可有效解决氢氧化镁团聚严重的问题.探究了SO4^2-对氢氧化镁脱落性能、产物形貌及生长方式的影响.结果表明:SO4^2-的质量浓度对氢氧化镁初始脱落时间影响较大,SO4^2-的质量浓度为0.45 g/L时,氢氧化镁性能最佳,初始脱落时间最短约10 min;氢氧化镁在极板上结晶长大时,生长方式为层岛复合生长模式,同时发现添加SO4^2-后,能够诱导氢氧化镁以阶梯状的方式生长.

Using the by-product of magnesium chloride from titanium sponge as a raw material,the magnesium hydroxide[Mg(OH)2]prepared by the aqueous solution electrode position method was agglomerated dramatically and it was difficult to fall from the electrode plate.By adding a certain amount of SO4^2- into the electrolyte to improve the dispersion of Mg(OH)2,the serious agglomeration can be avoided effectively.The effect of SO4^2- on the shedding performance,product morphology and growth mode of Mg(OH)2 was studied.The results show that the SO4^2- concentration has a great influence on the initial shedding time of Mg(OH)2.When the SO4^2- concentration is 0.45 g/L,the performance of Mg(OH)2 is the best,associated with the initial shedding time about 10 min.When the Mg(OH)2 crystals grow on the electrode plate,the growth mode is the layered-island composite growth.Meanwhile,it is also found that the addition of SO4^2- can induce the Mg(OH)2 to grow in a stepped manner.