About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Characterization of Minerals, Metals and Materials
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Presentation Title |
Melting and Solidification Behaviors of the Copper Slags with Different Cao Content at Various Oxygen Partial Pressures |
Author(s) |
Yannan Wang, Shuigen Huang, Bart Blanpain, Muxing Guo |
On-Site Speaker (Planned) |
Yannan Wang |
Abstract Scope |
The solidification behavior of slag plays a vital role in its recycling. In this study, Confocal Laser Scanning Microscope (CLSM) experiments were performed under various oxygen partial pressure (pO2) for FeO-SiO2-Al2O3-CaO slags with around 4 wt% and 26 wt% CaO to study their melting and solidification behaviors. Samples after the CLSM tests were analyzed by EPMA. Analysis indicated that the start melting temperature of the high CaO slag decreased with decreasing pO2 from 10-4 atm to 10-12 atm, and the CaO concentration in the slag had a significant influence on its solidification behavior at pO2 of 10-8 atm. Under pO2 of 10-8 atm with a cooling rate over 1 °C/s, wustite crystal precipitated in the CaO-rich slag at temperatures over 1200 °C, while spinel precipitated in the low CaO slag at temperatures between 1100 and 1250 °C. When the cooling rate was below 1 °C/s, the spinel precipitated firstly at temperatures over 1277°C in both slag systems. In addition, other minerals, such as melilite and fayalite, were observed respectively in the CaO-rich slag and low CaO slag. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Phase Transformations, Solidification |