期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 -, 期 -, 页码 -出版社
WILEY
DOI: 10.1111/jace.19523
关键词
lead oxide; liquidus; Ni recycling; nickel oxide; PbO-NiO-SiO2; phase equilibria; silica; slag
An integrated experimental and thermodynamic modeling investigation was conducted to characterize the phase equilibria in the PbO-NiO-SiO2 system, providing new experimental data and developing a thermodynamic database for a better understanding of the chemical reactions in Ni-containing Pb processing slags.
An integrated experimental and thermodynamic modeling investigation of the phase equilibria in the PbO-NiO-SiO2 system in air and also in equilibrium with liquid metal has been undertaken to better characterize the chemical reactions taking place in the Ni-containing Pb processing slags. New experimental phase equilibria data at 720 degrees C-1740 degrees C were obtained for this system using high-temperature equilibration of synthetic mixtures with predetermined compositions in sealed silica ampoules or in Au/Pt-Ir foils, a rapid quenching technique, and electron probe x-ray microanalysis of the equilibrated phase compositions. Phase equilibria and liquidus isotherms in the quartz/tridymite/cristobalite (SiO2), olivine (Ni2SiO4), monoxide (NiO), Ni-barysilite (Pb8NiSi6O21), massicot (PbO), and di-lead silicate (Pb2SiO4) primary phase fields were revealed and the extent of the high-SiO2 two-liquid immiscibility gap in equilibrium with cristobalite was determined. New experimental data were used in the development of a thermodynamic database describing this ternary system. Also, modeling revision of the NiO-SiO2 binary system was conducted, resulting in a smaller miscibility gap in ternary systems that was closer to the experimental results.
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