中國有色金屬學(xué)報(bào)(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 14 No. 5 October 2004 |
ZHANG Liang-miao(張良苗)2, LU Wen-cong(陸文聰)2,
CHEN Nian-yi(陳念貽)2
（1. Institute of Image Processing and Pattern Recognition,
Shanghai Jiaotong University, Shanghai 200030, China;
2. Laboratory of Chemical Data Mining, Department of Chemistry, Shanghai University, Shanghai 200436, China）
Abstract:Pattern recognition methods were used to treat the experimentally measured data of Pitzer’s coefficients of 107 electrolytes, to find the relationships between the ionic structural parameters of these electrolytes and Pitzer’s coefficients. It is found that these relationships can be approximately expressed as linear equations of four dimensionless numbers, (R+/R-), (R++R-)/Z+Z-, (Z+/Z-) and (Rt/Rl), where R+ and R- are the cationic and anionic radii respectively; Z+ and Z- are the cationic and anionic charge numbers respectively, and (Rt/Rl) denotes the nonsphericity of some non-spherical ions. Besides, it is found that the difference of the nuclear magnetic resonance measured rotational relaxation time of water molecules around cations and anions, |Δτ|, has good correlation with Pitzer’s coefficients. The relationships can be interpreted by the theory of corresponding states of ionic solutions. Based on the relationships, an example of application to some hydrometallurgical process was discussed.
Key words: concentrated electrolyte solutions; Pitzer’s coefficients; ionic parameters; corresponding state theory
