文献类型：期刊文献

中文题名：废弃水氯镁石反应结晶制备高纯氢氧化镁

英文题名：Synthesis of Magnesium Hydroxide used Waste Bischofite by Reaction Crystallization

作者：孙淑英[1];宋兴福[1];张登科[1];赵盼盼[1];孙玉柱[1];于建国[1]

机构：[1]华东理工大学国家盐湖资源综合利用工程技术研究中心,上海200237

年份：2010

卷号：33

期号：S2

起止页码：298

中文期刊名：环境科学与技术

外文期刊名：Environmental Science & Technology

收录：CSTPCD;;北大核心:【北大核心2008】；CSCD:【CSCD_E2011_2012】；

基金：上海市自然科学基金项目(09ZR147900);教育部新世纪人才计划(NCET-08-0776);上海市重点学科建设项目(B506)

语种：中文

中文关键词：水氯镁石;氢氧化镁;直接沉淀;粒径分布

外文关键词：bischofite;magnesium hydroxide;direct precipitation method;particle size distribution

摘要：以水氯镁石和氢氧化钠为原料,氯化钠为添加剂,采用直接沉淀法制备了粒径分布均匀、分散性良好的高纯氢氧化镁。研究了制备条件对氢氧化镁纯度、粒径、过滤性能的影响。通过马尔文粒度分析仪、XRD、SEM和化学分析等手段对产品的粒径分布、晶相、形貌和纯度进行了表征。结果表明,停留时间、搅拌速率和反应物浓度对晶体的含水量和粒径分布有重要的影响。通过该方法制得的产品为平均粒径9.4~17.2μm的球状氢氧化镁,纯度超过98.5%。该方法具有反应条件温和、操作简单的优点,适合工业化生产。
In this work,magnesium hydroxide with high purity,uniform morphology and particle size was synthesized via direct precipitation method using bischofite and NaOH solution as raw materials,NaCl solution as assistant additives.The influence of synthesis parameters on purity,the particle size and filtration property of magnesium hydroxide was investigated.The particle size and its distribution,crystal phase and morphology of the product were characterized by Malvern laser particle size analyzer,XRD and SEM.The purity of products was investigated by chemical analysis.The results indicate that the retention time,reactant concentration and stirring rate have strong effects,mainly on the water content and particle size.The particle size analysis and SEM observation showed that ball-like magnesium hydroxides with volume weighted mean at 9.4~17.2 μm are obtained.The purity of Mg(OH)2 is more than 98.5%.This simple method,which has the advantages of mild condition,simple treatment process,is promising to be scaled up for industrial production.