盐卤硼酸盐化学(非汉字字符)——MgO·nB_2O_3-18%MgCl_2-H_2O过饱和溶液20℃结晶动力学  

Chemistry of Borate(非汉字字符)——Crystallization Kinetics of Mg-borates from MgO·nB_2O_3-18%MgCl_2-H_2O Supersaturated Solution at 20 ℃

作　　者：朱黎霞[1] 高世扬[1] 郝志显[1] 夏树屏[1] 

机构地区：[1]中国科学院青海盐湖研究所西安二部,西安710043

出　　处：《高等学校化学学报》2002年第9期1753-1757,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金 (批准号 :2 99710 3 2 )资助

摘　　要：用结晶动力学方法对不同摩尔比的 Mg O/B2 O3在摩尔分数为 1 8% Mg Cl2 -H2 O中的过饱和溶液在2 0℃的结晶动力学过程进行了研究 .n(Mg O) /n(B2 O3) =1 /1和 1 /1 .5时分别结晶析出 2 Mg O· 2 B2 O3·Mg Cl2 · 1 4H2 O和 2 Mg O· 3 B2 O3· 1 5 H2 O(多水硼镁石 ) .n(Mg O) /n(B2 O3) =1 /2时依次结晶析出 Mg O·3 B2 O3· 7.5 H2 O,Mg O· 2 B2 O3· 9H2 O和 2 Mg O· 3 B2 O3· 1 5 H2 O(多水硼镁石 ) 3种固相 .n(Mg O) /n(B2 O3)=1 /3时结晶析出不同结晶水的六硼酸镁 Mg O· 3 B2 O3· 7H2 O和 Mg O· 3 B2 O3· 7.5 H2 O.析出固相采用X射线粉末衍射、红外光谱和热分析进行物相鉴定 .拟合并给出结晶动力学方程 。The MgO·\%n\%B\-2O\-3(\%n\%=1, 1.5, 2 and 3)\|18%MgCl\-2\|H\-2O supersaturated solution system were prepared and kept at 20 ℃. The crystallization processes of different hydrated Mg\|borates from MgO·\%n\%B\-2O\-3\|18%MgCl\-2\|H\-2O supersaturated solution have been studied by kinetic method and the crystallization kinetic equations were fitted with the experimental data by computer. There were five solid phases, 2MgO·2B\-2O\-3·MgCl\-2·14H\-2O, 2MgO·3B\-2O\-3·15H\-2O, MgO·2B\-2O\-3·9H\-2O, MgO·3B\-2O\-3·7.5H\-2O and MgO·3B\-2O\-3·7H\-2O in the title system. All the solid phases were identified by IR\|spectra, X\|ray powder diffraction and TG\|DTG\|DSC thermal analysis.

关 键 词：盐卤 结晶动力学 过饱和溶液 镁硼酸盐 

分 类 号：O645.5[理学—物理化学]