SO2-4对电沉积法制备氢氧化镁的影响

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SO^2-₄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SO^2-₄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:SO^2-₄的质量浓度对氢氧化镁初始脱落时间影响较大，SO^2-₄的质量浓度为0.45g/L时，氢氧化镁性能最佳，初始脱落时间最短约 10min；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SO^2-₄后，能够诱导氢氧化镁以阶梯状的方式生长.

Effect of SO2-4 on Preparation of Magnesium Hydroxide by Electrode Position

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 SO^2-₄ into the electrolyte to improve the dispersion of Mg(OH)₂， the serious agglomeration can be avoided effectively. The effect of SO^2-₄ on the shedding performance， product morphology and growth mode of Mg(OH)₂ was studied. The results show that the SO^2-₄ concentration has a great influence on the initial shedding time of Mg(OH)₂. When the SO^2-₄ concentration is 0.45g/L， the performance of Mg(OH)₂ is the best， associated with the initial shedding time about 10min. 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 SO^2-₄ can induce the Mg(OH)₂ to grow in a stepped manner.