有机胺萃取分离钾钠制备硫酸钾  

Preparation of Potassium Sulphate from Separation of Potassium and Sodium by Amine Extraction

作　　者：王丽[1] 王英滨[1] 马鸿文[1] 杨慧君[1] 

机构地区：[1]中国地质大学材料科学与工程学院,北京100083

出　　处：《高校化学工程学报》2012年第1期151-154,共4页Journal of Chemical Engineering of Chinese Universities

基　　金："十一五"国家科技支撑计划课题(2006BAD10B04)

摘　　要：以霓辉正长岩烧结物料的水浸滤液(经CO2酸化处理后)为研究对象,该溶液为简单的NaHCO3-KHCO3-H2O三元体系。在60℃等温蒸发结晶至溶液中质量比m(Na2CO3)/m(K2CO3)≈2时,按照V(有机相)/V(无机相)=3.5:1加入有机胺萃取体系,萃取体系是由V(三正丁胺)/V(正丁醇)=1:2.5均匀混合而成,利用钾、钠的碳酸氢盐在有机相-H2O混合液体系中的溶解度差异显著进行钾钠分离。在温度25℃、搅拌条件下以流速0.15 m3.h.1通入CO2 1.5 h,可分离出碳酸钠约99%,加入适量硫酸,即得硫酸钾。分析结果表明所得产品达到了国家农用硫酸钾的优等品标准。The potassium sulphate was prepared by using the lixivium of sintered Aegirine-augite syenite as raw material.The lixiviated solution can be regarded as a simple KHCO3-NaHCO3-H2O ternary system and was treated with isothermal evaporation and crystallization at 60℃ until the mass ratio of sodium carbonate and potassium carbonate reaches about 2;then added the organic amine extraction system consisted of V（organic phase）/V（inorganic phase）=3.5：1 into the solution.Since the solubility of the K＋ and Na＋ in the organic phase-H2O miscible liquid system are significantly different,the well-distributed organic amine extraction system consisted of V（tri-butyl amine）/V（n-butyl alcohol）=1：2.5 was used to separate the K＋ from Na＋ in the carbonic solution.Under the temperature of 25℃,with stirring and injecting CO2 at rate of 0.15 m^3·h·^-1 for 1.5 h,about 99% sodium carbonate could be separated out by the followed vacuum filtration.Finally,the potassium sulphate could be obtained by adding a certain amount of sulfuric acid into the filtrate.The results show that the product K2SO4 reaches the premium grades of agricultural potassium sulfate.

关 键 词：霓辉正长岩 有机胺 萃取 硫酸钾 

分 类 号：TQ443.2[化学工程—化学肥料工业] TQ028.32