四元体系Na_2B_4O_7-Na_2CO_3-NaHCO_3-NaBO_2-H_2O多温(0～45℃)溶度研究  

Studies on the Polythermal Solubility of System Na_2B_4O_7- Na_2CO_3-NaHCO_3-NaBO_2-H_2O at 0-45 ℃

作　　者：张逢星[1] 杨琴[1] 李珺[1] 王振军[1] 李恒欣[1] 

机构地区：[1]西北大学化学系

出　　处：《高等学校化学学报》2002年第7期1236-1240,共5页Chemical Journal of Chinese Universities

摘　　要：报道了四元体系 Na2 B4 O7-Na2 CO3-Na HCO3-Na BO2 -H2 O在 0 ,1 5 ,2 5 ,3 5及 45℃时的等温溶度 ,通过数据拟合等温截面无变点溶度数据与温度的关系 ,给出了相应的溶度 -温度关系式 ,绘出了该体系 0～45℃时的多温关系图 .这些结果有助于揭示含硼碱湖的固体盐矿成因 ,给出了有关盐卤存在的反应2 Na2 CO3+Na2 B4 O7+H2 O=4Na BO2 +2 Na HCO3的相化学揭示 .The isothermal solubilities of the system Na 2B 4O 7 Na 2CO 3 NaHCO 3 NaBO 2 H 2O have been determined at 0, 15, 25, 35 and 45 ℃. On the basis of the isothermal solubilities of the system we constructed its polythermal solubility diagram at 0-45 ℃ by nonlinear fitting method. The formation temperature of Trona is _19.6 ℃, the temperature is lower than 32.7 ℃ when the system Na 2B 4O 7 Na 2CO 3H 2O is a real ternary one. These results have the values of theory and practice for finding the reason of salts mineral bed forming and phase relations of system.

关 键 词：Ns2B4O7 NA2CO3 NAHCO3 NaBO2 多温溶度图 四元体系 盐湖资源 相化学 硼酸钠 碳酸钠 

分 类 号：TS311[轻工技术与工程] O642.4[理学—物理化学]