Phase Equilibria of “Cu2O-“FeO-SiO2-CaO Slags at PO2 at 10-8 atm in Equilibrium with Metallic Copper
Limited data are available on phase equilibria of the Cu2O-FeO-SiO2-CaO slag system at the oxygen partial pressures used in the copper smelting, converting and slag cleaning processes. Recently experimental procedures have been developed and have been successfully applied to characterise a number of complex industrial slags. The experimental procedures involve high temperature equilibration on a primary phase substrate and rapid quenching of the sample followed by the electron probe X-ray microanalysis. This technique has been used to construct the liquidus isotherms in the Cu2O-FeO-SiO2-CaO slag system in equilibrium with copper. The liquidus isotherms and solubilities of copper oxide in liquid slags at the controlled oxygen partial pressure of 10-8 atm and temperatures between 1150 and 1350 0C have been determined in equilibrium with metallic copper and the tridymite, olivine, wustite, wollastonite or pseudo-wollastonite solid phases. The new experimental data on copper solubility in slag at different temperatures have been analysed using a regular solution model to describe the activity coefficients of copper oxide as a function of temperature and liquid slag composition. The new experimental equilibrium results are presented in the form of ternary sections and the effects of slag composition on the calculated activity coefficients of liquid CuO0.5 in slag are reported. The activity coefficient γCuO0.5 is shown to significantly increase with increasing CaO/SiO2 and Fe/SiO2 weight ratios.
Hector M. Henao Peter C. Hayes Evgueni Jak
Pyrometallurgy Research Centre (PYROSEARCH), School of Chemical Engineering, The University of Queensland, Brisbane, 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）