硫酸浸出硼泥制备片状氢氧化镁实验研究  

Study on preparation of plate-shape magnesium hydroxide by leaching boron mud with sulphuric acid

作　　者：孙青[1] 侯会丽[1] 郑水林[1] 叶鹏[1] 

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《无机盐工业》2013年第11期21-24,共4页Inorganic Chemicals Industry

摘　　要：对硫酸浸出硼泥制备氢氧化镁进行了研究,考察了反应温度、反应时间、硫酸用量和硫酸初始浓度等因素对硼泥中镁浸出率的影响。结果表明:在浸出硫酸足量的条件下,反应温度对镁浸出率影响最大。实验得到酸浸条件:反应温度为95℃、反应时间为3 h、硫酸质量分数为40%、硫酸用量为理论量的1.2倍。在此条件下,硼泥中镁的浸出率为95.62%。反应完成后,得到初级硫酸镁浸出液,通过进一步梯度碱析和水热反应,制得纯度为99.35%的片状氢氧化镁。SEM和XRD测试表明,片状氢氧化镁具有形貌均一、颗粒分散性好和结晶度高的特征。The leaching behavior of boron mud for preparation of magnesium hydroxide in the sulphuric acid was investigated. The effect of factors, such as reaction temperature, reaction time, amount of sulfuric acid, and sulfuric acid initial concentra- tion, on the leaching rate of Mg were investigated through orthogonal experiments and factorial experiments.Results showed that the most important factor among them was reaction temperature with enough sulphuric acid.The optimal leaching condi- tions were obtained through experiments：reaction temperature was 95 ~C, reaction time was 3 h, sulfuric acid mass fraction was 40%, and amount of sulfuric acid was 1.2 times more than that of theoretical value.Under the above conditions the leach- ing rate of magnesium was 95.62%.After completion of the reaction, the primary magnesium sulfate solution was prepared.A purity of 99.35% of the plate-shape magnesium hydroxide was obtained by further gradient alkaline separation and hydrother- mal reaction.SEM and XRD results showed that the plate-shape magnesium hydroxide had characteristics of uniform mor- phology, excellent particle dispersion, and high crystallinity.

关 键 词：硫酸 硼泥 浸出 氢氧化镁 

分 类 号：TQ132.2[化学工程—无机化工]