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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 1    February 2001

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A new look atφ-pH diagram (Ⅱ)
——All-equilibrium φ-pH diagram for M-ligand-H2O system
LIU Hai-xia(刘海霞), ZHANG Chuan-fu(张传福)

Department of Metallurgical Science and Engineering, Central South University,
 Changsha 410083, P.R.China

Abstract: A new viewpoint on metal complex system was proposed on traditional M-ligand-H2O system φ- pH diagrams. Simultaneous equilibrium principle and activity term method were used to plot all-equilibrium φ- pH diagrams for M-ligand-H2O systems based on the thermochemical database developed. The mathematical and computer algorithms were described with the Cu-NH3-H2O system as an example. More quantitative information on real hydrometallurgical processes can be obtained from these diagrams compared with the conventional Pourbaix φ- pH diagram.

 

Key words:   activity term method; simultaneous equilibrium; metal-ligand-H2O system; nonlinear equation group

ISSN 1672-7029
CN 43-1423/U

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