改进石灰卤水法制备Mg(OH)_2  

Preparation of magnesium hydroxide by improved brine-lime route

作　　者：张月琴[1] 叶旭初[1] 张林进[1] 

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京210009

出　　处：《南京工业大学学报（自然科学版）》2008年第6期54-58,共5页Journal of Nanjing Tech University(Natural Science Edition)

摘　　要：采用制盐后的卤水为原料、NH3.H2O和石灰乳作为混合沉淀剂,以卤水为底液,在一定的工艺条件下制备Mg(OH)2.考察反应温度、陈化时间、卤水的浓度和石灰乳溶液的滴加速率对Mg(OH)2性能的影响,并采用扫描电镜(SEM)、X射线衍射(XRD)等分析手段对Mg(OH)2晶体结构进行表征.试验结果表明,在反应温度60℃、陈化时间1.5 h、卤水浓度0.8 mol/L、石灰乳溶液的滴加速率7 mL/min时,得到了过滤时间短、钙镁质量比(简称钙镁比值)低和六方片状的Mg(OH)2产品.Magnesium hydroxide was prepared by sea bittern and mix precipitator of ammonia and lime milk to obtain the best technological conditions, including the reaction temperature, the aging time, the concentration of sea bittern, and the lime milk dropping rate. The crystal configuration was characterized by scanning electron microscope （SEM） and X-ray diffraction （XRD）. Under the following conditions of the reaction temperature 60℃, the aging time 1.5 h, the concentration of brine 0. 8 mol/L and the dropping rate of lime milk 7 mL/min, the prepared magnesium hydroxide of flake shape has a short filtrate time and low calcium-magnesium ratio.

关 键 词：卤水 MG(OH)2 混合沉淀剂 钙镁比值 

分 类 号：TQ016[化学工程]