硫酸镁与碳酸钠反应制备碱式碳酸镁的研究  

Research on preparation of magnesium carbonate hydroxide by MgSO_4 reacting with Na_2CO_3

作　　者：赵斌[1] 马雪晴[1] 白艳[1] 郭宏飞[1] 曹吉林[1] 

机构地区：[1]河北工业大学化工学院,河北省绿色化工与高效节能重点实验室,天津300130

出　　处：《无机盐工业》2017年第9期23-27,共5页Inorganic Chemicals Industry

基　　金：国家自然科学基金项目(21076057);河北省自然科学基金项目(B2017202268)

摘　　要：围绕七水合硫酸镁和碳酸钠为原料制备碱式碳酸镁,考察了复分解反应温度、热解温度、热解时间、反应物浓度、原料配比以及原料硫酸镁中加入硫酸钠等因素对硫酸镁转化率和产品结构形貌的影响。采用X射线衍射(XRD)、扫描电镜(SEM)对样品进行表征。结果表明:制备碱式碳酸镁的适宜条件为复分解反应温度为50℃、热解温度为85℃、热解时间为2 h、原料硫酸镁的浓度为0.3 mol/L、硫酸镁与碳酸钠物质的量比为1∶1.1;所得产品碱式碳酸镁为片状结构聚集的玫瑰花样棒状;原料硫酸镁中加入一定量硫酸钠对碱式碳酸镁的制备没有明显的影响。此外,设计了制备碱式碳酸镁的工艺,并实现了母液的循环利用。Magnesium carbonate hydroxide was successfully prepared using MgSO4·7H2 O and Na2 CO3 as staring materials. The effects ofthe reaction temperature,pyrolysis temperature,pyrolysis time,reactant concentration,molar ratios of raw ma-terials,and adding Na2 SO4 into the raw material of magnesium sulfate on the conversion rate of magnesium sulfate and product structure morphology were investigated.X-ray powder diffraction and scanning electron microscopy were employed to charac-terize the samples.Results demonstrated that the suitable conditions of the preparation of magnesium carbonate hydroxide were as follows： reaction temperature was 50 益, pyrolysis temperature was 85 益, pyrolysis time was 2 h,raw material MgSO4 concentration was 0.3 mol/L,the amount of substance ratio of MgSO4 ＊7H2 O to Na2 CO3 was 1 ： 1.1 the shape of magnesium carbonate hydroxide is roses rod with lamellar structure gathering;There was no significant effect on the preparation of magnesium carbonate hydroxide,when a certain amount ofsodium sulfate was added into raw materials of magnesium sulfate. In addition,the preparation of basic magnesium carbonate process was designed and the mother liquor can be recycled.

关 键 词：碱式碳酸镁 硫酸镁 碳酸钠 硫酸钠 

分 类 号：TQ132.2[化学工程—无机化工]