TY - JOUR
T1 - Determination of the Carbon-Saturated SiO2-CaO-TiOx Phase Diagram at 1773 K
AU - Murata, Takashi
AU - Yamaguchi, Katsunori
N1 - Funding Information:
The authors would like to thank Tanaka Kikinzoku Kogyo K.K. for their helpful suggestions and discussions, Kagami Memorial Research Institute for Materials Science and Technology of Waseda University for the use of XRD and EPMA, and Editage (www.editage.com ) for language support during the preparation of this paper.
Publisher Copyright:
© 2022, ASM International.
PY - 2022/10
Y1 - 2022/10
N2 - In the present work, a pyrometallurgical process is considered, in which platinum group metals (PGMs) from the hydrometallurgical residue containing mainly TiO2 are concentrated in a metal phase with Cu as a collector, and TiO2 is separated into the slag phase, with SiO2 and CaO as fluxing agents. Efficient separation is thought to be possible only if the slag remains a homogenous liquid, with no solid phases present. In this study, the phase diagram of the SiO2-CaO-TiOx system equilibrated with graphite and CO gas at 1773 K was experimentally determined to find the liquid slag composition region with a large solubility of TiOx. The results showed that at high TiOx slag concentrations, a reaction occurred with the graphite crucible to form solid TiC. Additionally, the solubility of TiOx in the slag increased as the ratio of mass%CaO/mass%SiO2 decreased.
AB - In the present work, a pyrometallurgical process is considered, in which platinum group metals (PGMs) from the hydrometallurgical residue containing mainly TiO2 are concentrated in a metal phase with Cu as a collector, and TiO2 is separated into the slag phase, with SiO2 and CaO as fluxing agents. Efficient separation is thought to be possible only if the slag remains a homogenous liquid, with no solid phases present. In this study, the phase diagram of the SiO2-CaO-TiOx system equilibrated with graphite and CO gas at 1773 K was experimentally determined to find the liquid slag composition region with a large solubility of TiOx. The results showed that at high TiOx slag concentrations, a reaction occurred with the graphite crucible to form solid TiC. Additionally, the solubility of TiOx in the slag increased as the ratio of mass%CaO/mass%SiO2 decreased.
KW - phase equilibria
KW - precious metal smelting
KW - pyrometallurgy
KW - slag
KW - titanium oxide
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U2 - 10.1007/s11669-022-00997-y
DO - 10.1007/s11669-022-00997-y
M3 - Article
AN - SCOPUS:85140599366
VL - 43
SP - 547
EP - 553
JO - Bulletin of Alloy Phase Diagrams
JF - Bulletin of Alloy Phase Diagrams
SN - 1547-7037
IS - 5
ER -