Isopiestic Studies of Thermodynamic Properties and Representation with Ion-interaction Model for Li2B4O7-MgCl2(B)-H2O System at 298.15 K

Acta Chimica Sinica ›› 2004, Vol. 62 ›› Issue (12): 1089-1094. Next Articles

Li₂B₄O₇-MgCl₂(B)-H₂O体系热力学性质的等压研究及离子相互作用模型

张爱云^1,2,3, 姚燕¹, 杨吉民¹, 宋彭生¹

1. 中国科学院青海盐湖研究所, 西宁, 810008;
2. 中国科学院研究生院, 北京, 100039;
3. 黑龙江科技学院, 哈尔滨, 160000

投稿日期:2003-12-08 修回日期:2004-03-02 发布日期:2014-02-17
通讯作者: 姚燕,E-mail:yanyao@pub.xaonline.com E-mail:yanyao@pub.xaonline.com
基金资助:
国家自然科学基金(Nos.29871034;20373084)和中国科学院基础局重点基础资助项目.

Isopiestic Studies of Thermodynamic Properties and Representation with Ion-interaction Model for Li₂B₄O₇-MgCl₂(B)-H₂O System at 298.15 K

ZHANG Ai-Yun^1,2,3, YAO Yan¹, YANG Ji-Min¹, SONG Peng-Sheng¹

1. Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008;
2. Graduate School of Chinese Academy of Sciences, Beijing 100039;
3. Heilongjiang Science and Technology College, Harbin 160000

Received:2003-12-08 Revised:2004-03-02 Published:2014-02-17

Abstract

The isopiestic molalities and the water activities have been measured by isopiestic method and the water vapor pressures and the osmotic coefficients have been calculated from the measurements in the ion-strength range from 0.0581 mol·kg^-1 to 0.6320 mol·kg^-1 at T=298.15 K for the system Li-Mg-Cl-borate-H₂O. The formation reaction equilibria of boron species of boric acid (H₃BO₃) and borate anions [B(OH)₄^-, B₃O₃(OH)₄^- and B₄O₅(OH)₄^2-] have been taken into account for the system in different total boron concentration ranges. A simplified model based on Pitzer's osmotic coefficient equations with minor modifications has been proposed by combining the same kinds of ion-interactions related to the different borate anions, which reduced the number of ion-interaction parameters from 52 in the primary model to 23 in the simplified model. The ion-interaction parameters among the groups of borate anions, Cl^-, Li⁺ and Mg²⁺ for the simplified model have been estimated using the experimental data taken from this work and references. The osmotic coefficient values determined experimentally and those calculated by using the model with the parameters are in reasonable agreement. Pitzer's ion-interaction model has been extended to represent the thermodynamic properties of the complex system containing various borate anions. These studies are useful to improve the thermodynamic model for salt lake brine systems containing lithium and borates.

Key words: Li₂B₄O₇-MgCl₂-H₂O system, isopiestic method, osmotic coefficient, ion-interaction model

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ZHANG Ai-Yun, YAO Yan, YANG Ji-Min, SONG Peng-Sheng. Isopiestic Studies of Thermodynamic Properties and Representation with Ion-interaction Model for Li₂B₄O₇-MgCl₂(B)-H₂O System at 298.15 K[J]. Acta Chimica Sinica, 2004, 62(12): 1089-1094.

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Li₂B₄O₇-MgCl₂(B)-H₂O体系热力学性质的等压研究及离子相互作用模型

Isopiestic Studies of Thermodynamic Properties and Representation with Ion-interaction Model for Li₂B₄O₇-MgCl₂(B)-H₂O System at 298.15 K

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Li2B4O7-MgCl2(B)-H2O体系热力学性质的等压研究及离子相互作用模型