NUMERICAL-METHOD FOR COMPUTING HYDROMETALLURGICAL ACTIVITY-ACTIVITY DIAGRAMS

被引：30

作者：

OSSEOASARE, K

机构：

[1] Metallurgy Section, Department of Materials Science and Engineering, The Pennsylvania State University, University Park

[2] Department of Geological Sciences, University of British Columbia, Vancouver

来源：

HYDROMETALLURGY | 1979年 / 4卷 / 03期

关键词：

D O I：

10.1016/0304-386X(79)90013-6

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

A modification of the DIAGRAM computer program has been developed to facilitate graphical representation of hydrometallurgical equilibria. The method is based on dissociation equations with corresponding log equilibrium constants, Ki, and log reaction quotients, Qi; Ki equals Qi at equilibrium. The ith dissociation equation is written in terms of Qi, the log activity of the ith metallic species (Pi), and a certain set of variables (Vj), representing the log activities of species whose stability fields are not to be plotted (e.g., log{Me2+}, log{e}, log{H+}): Qi = BiPi + ∑ j=i nCijVj where Bi is the reaction coefficient of the ith metallic species in the ith dissociation equation, and Cij is the reaction coefficient of the jth variable in the ith dissociation equation. One of the variables is designated the balancing variable and allows comparison of the relative stability of any two metallic species to be made in terms of a single equation. By means of the balancing variable, the program generates internally the m(m-1)/2 relative stability equations linking pairs of the m metal-containing species. The stability region of each metallic species is then determined by a systematic scanning of the plotting area using the criterion (KL>QL?). DIAGRAM can calculate and plot stability diagrams using any two of the system variables. Thus not only Eh-pH diagrams, but additional plots of log {Metal}-pH, log{Metal}-Eh, log{NH2 + NH4+}-pH, etc. can be generated readily. The numerical and thermodynamic bases of the program are described and the capability of DIAGRAM is illustrated with some selected hydrometallurgical examples. © 1979.

引用

页码：217 / 232

页数：16

共 18 条

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