Effect of Basicity on the Sulfur Precipitation and Occurrence State in Kambara Reactor Desulfurization Slag
Abstract
:1. Introduction
2. Experimental Procedure
2.1. Synthetic Slag Composition
2.2. Preparation Process of Synthetic Slag
2.3. Analysis Method
3. Thermodynamic Calculation of Synthetic Slag Solidification
4. Results
4.1. Analysis of Synthetic Slag
4.2. Microstructure of the Slag Samples
5. Discussion
5.1. Effect of Basicity on the Sulfur Precipitation Behavior
5.2. Effect of Basicity on the Occurrence State of Sulfur in Slag
6. Conclusions
- (1)
- According to the calculated results of molten slag solidification process based on thermodynamic database FactSage8.1, it was concluded that sulfur in KR desulfurization slag was mainly precipitated in the form of CaS, and the crystallization temperature of CaS in slag decreased with the increase of basicity;
- (2)
- CaS grains mainly precipitated along silicate grain boundaries in low-basicity (R = 2.5 and 3.0) slags, and the precipitation behavior of CaS was mainly heterogeneous nucleation. There were fewer CaS grains precipitated along silicate grain boundaries in molten slags with high basicity (R = 3.5, 4.0 and 4.5), and the precipitation behavior of sulfur in matrix phase was mainly homogeneous nucleation;
- (3)
- The number and the size of CaS grains decreased and increased respectively with the increase of the slag basicity.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Sample | CaO | SiO2 | Al2O3 | MgO | CaS | CaF2 | CaO%/SiO2% |
---|---|---|---|---|---|---|---|
S1 | 59.23 | 23.69 | 6.00 | 3.00 | 3.38 | 6.58 | 2.50 |
S2 | 61.96 | 20.65 | 6.00 | 3.00 | 3.38 | 6.88 | 3.00 |
S3 | 64.07 | 18.31 | 6.00 | 3.00 | 3.38 | 7.12 | 3.50 |
S4 | 65.76 | 16.44 | 6.00 | 3.00 | 3.38 | 7.31 | 4.00 |
S5 | 67.13 | 14.92 | 6.00 | 3.00 | 3.38 | 7.46 | 4.50 |
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Zhu, R.; Li, J.; Jiang, J.; Yu, Y.; Zhu, H. Effect of Basicity on the Sulfur Precipitation and Occurrence State in Kambara Reactor Desulfurization Slag. Minerals 2021, 11, 977. https://doi.org/10.3390/min11090977
Zhu R, Li J, Jiang J, Yu Y, Zhu H. Effect of Basicity on the Sulfur Precipitation and Occurrence State in Kambara Reactor Desulfurization Slag. Minerals. 2021; 11(9):977. https://doi.org/10.3390/min11090977
Chicago/Turabian StyleZhu, Renlin, Jianli Li, Jiajun Jiang, Yue Yu, and Hangyu Zhu. 2021. "Effect of Basicity on the Sulfur Precipitation and Occurrence State in Kambara Reactor Desulfurization Slag" Minerals 11, no. 9: 977. https://doi.org/10.3390/min11090977