A thermodynamic optimization of “Cu2O-containing slags systems
Prediction of phase equilibria and thermodynamics of complex copper smelting, converting and cleaning slag system is essential for further improvements in industrial operations. The previously existing chemical thermodynamic database for the system is being improved as part of the overall integrated research program on complex copper slag-matte-metal-solids systems combining experimental and thermodynamic modeling studies. Computerized thermodynamic database for the liquid slag and solid oxide phases for the Cu2O-Al2O3-CaO-FeO-Fe2O3-MgO-SiO2-S system at conditions of equilibrium with metallic copper is further improved by critical evaluation/optimization of all previous available phase diagram-thermodynamic data and new experimental data that have been deliberately characterized in PYROSEARCH-UQ to support the present thermodynamic optimization work. The database contains parameters of models for the molten slag and solid oxide solutions such as olivine, melilite, pyroxene, monoxide, spinel, etc. The Bragg-Williams and Modified Quasi-chemical models are used to describe the Gibbs free energy of the molten slag solution. Model parameters are derived by the optimization process to reproduce all thermodynamic and phase diagram data within experimental error limits. All binary, ternary and higher order Cu-oxide-containing sub-systems are optimized simultaneously to obtain a self-consistent set of model parameters. This results in a significant improvement in the predictive ability of the computer model. The models permit extrapolation into regions of temperature and composition where experimental data are not available. Details of the recent thermodynamic optimization of the investigated system are presented. The thermodynamic database is automatically accessed by FactSage software that calculates complex multi-component, multi-phase equilibria involving simultaneously slag, metal, solid and gas phases over wide ranges of temperatures and oxygen partial pressures. The ability to calculate and predict the phase equilibria, partitioning of major and minor elements between phases, activities, vapor pressure, and other thermodynamic properties over a wide range of process conditions in copper production can enable informed decision to be made in relation to the optimum slag compositions, fluxing strategies, and operating conditions in copper smelting, converting, and slag cleaning processes for given feed and product requirement. Industrial application of the database for the copper metallurgical process is discussed.
Copper smelting thermodynamics database phase diagrams pyrometallurgy slag chemistry
Taufiq HIDAYAT Evgueni JAK
Pyrometallurgy Research Centre (PYROSEARCH), The University of Queensland, Brisbane, QLD 4072, Australia
国际会议
Ninth International Conference on Molten Slags,Fluxes and Salts(第九届国际熔渣、溶剂与熔盐学术会议 MOLTEN12)
北京
英文
1-12
2012-05-27（万方平台首次上网日期，不代表论文的发表时间）