硼酸盐化学(XXXV):MgO·3B_2O_3-18%MgSO_4-H_2O过饱和溶液0℃结晶动力学研究  

Chemistry of Borate in Salt Lake Brines(xxxv):Study on Crystallization Kinetics of MgO·3B_2O_3-18%MgSO_4-H_2O Supersaturated Solution at 0℃

作　　者：苟国敬[1] 高世扬[1] 夏树屏[2] 朱黎霞[1] 

机构地区：[1]中国科学院青海盐湖研究所西安二部,陕西西安710043 [2]陕西师范大学应用化学研究所,陕西西安710062

出　　处：《盐湖研究》2003年第1期52-58,共7页Journal of Salt Lake Research

基　　金：国家自然科学基金资助项目 (2 99710 32 )

摘　　要：首次研究了MgO·3B2 O3 1 8%MgSO4 H2 O过饱和溶液 0℃结晶动力学过程 ,得到三方硼镁石和章氏硼镁石两种固相及其结晶动力学方程。从多聚硼氧配阴离子多粒子共存的角度提出结晶反应机制 ,分析了制约硼酸镁盐析出的因素及不同电解质 (MgCl2 和MgSO4)对硼酸镁盐结晶过程的影响。In this paper,the crystallization processes of Mg-borates from the MgO·3B 2O 3-18%MgSO 4-H 2O supersaturated solution at 0℃ was studied using kinetics method for the first time.Two solid phases were obtained,namely macallisterite(MgO·3B 2O 3·7.5H 2O)and hungchaoite(MgO·2B 2O 3·9H 2O),which were identified by IR-spectra,X-ray powder diffraction and TG-DTG-DSC thermal analysis,and the crystallization kinetics equations were fitted with the experimental data.According to the viewpoint of coexistence of polyborate anions,the crystallization reaction mechanism has been suggested,and the factors,which affect the crystallization processes of the Mg-borates,also have been discussed.

关 键 词：硼酸镁盐 三方硼镁石 章氏硼镁石 硼氧配阴离子 

分 类 号：O643.12[理学—物理化学]