苦卤制备碱式碳酸镁及分离钠、钾盐工艺研究  

Preparation of basic magnesium carbonate and separation of sodium and potassium salts from bittern

作　　者：王晶瑶 郭宏飞[1] 吴耀 赵斌[1] 刘秀伍[1] 曹吉林[1] WANG Jing-yao;GUO Hong-fei;WU Yao;ZHAO Bin;LIU Xiu-wu;CAO Ji-lin(Hebei Provincial Key Lab of Green Chemical Technology and High Efficient Energy Saving,College of Chemical Engineering and Technology,Hebei University of Technology,Tianjin 300130,China)

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：《高校化学工程学报》2020年第2期383-392,共10页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(21576066);河北省自然科学基金(B2017202268,B2018202330);广东省绿色化工产品重点实验室研究基金(GC201816)。

摘　　要：苦卤是富含镁盐、钠盐及少量钾盐的复杂水盐体系,为了提高镁盐产品价值并有效分离钠盐和钾盐,提出苦卤与碳酸钠或碳酸钠和氢氧化钠混合碱反应制备碱式碳酸镁,然后再分离剩余各盐的工艺。苦卤与碳酸钠和氢氧化钠混合液反应合成碱式碳酸镁的适宜条件为:Mg^2+:CO3^2-:OH^-摩尔比为5:4.8:2,反应温度为60℃,反应时间为2.5h。此时,镁离子和碳酸根离子的转化率分别为100%和90%,得到直径为10~30μm的碱式碳酸镁球状产品。苦卤制备碱式碳酸镁后,剩余母液可依据K^+,Na^+//Cl^-,SO4^2--H2O体系和KCl-Na2CO3-H2O体系相图将其中钠盐及钾盐分离。Bittern is a complex water salt system containing a large amount of magnesium and sodium salts,and a small amount of potassium salts.In order to improve the value of magnesium salt products and effectively separate sodium and potassium salts in bittern,basic magnesium carbonate was prepared by reaction of bittern with sodium carbonate or sodium carbonate and sodium hydroxide,and then the remaining salts were separated.The optimal reaction conditions are as follows:Mg^2+:CO3^2-:OH^-=5:4:8:2,reaction temperature=60℃and reaction time=2.5 h.The conversion of magnesium ion and carbonate ion were 100%and 91%,respectively,and the basic magnesium carbonate was spherical with diameter of 10~30μm.After the preparation of basic magnesium carbonate from bittern.The remaining mother liquor can be separated from sodium salt and potassium salt according to the phase diagrams of K^+,Na^+//Cl^-,SO4^2--H2O system and KCl-NaCl-H2O system.

关 键 词：苦卤 碱式碳酸镁 转化率 相图 

分 类 号：TQ132.2[化学工程—无机化工]