Investigation of Preparation of Slag Wool from Melting-Separated Red Mud
Abstract
:1. Introduction
2. Materials and Methods
2.1. Experimental Materials
2.2. Analysis of Macroscopic Properties of Modified Melting-Separated Red Mud
2.3. Preparation and Performance Characterization of Slag Wool
3. Results and Analysis
3.1. Viscosity and Fluidity
3.2. Crystallization Performance
3.3. Morphology and Properties of Slag Wool
4. Conclusions
- (1)
- For CaO/Na2O ratios from 2.6 to 5.0, the viscosity of the modified melting-separated red mud decreases with increasing temperature; the activation energy of the particle movement of the modified melting-separated red mud shows a trend of slowly increasing–sharply increasing–decreasing with increasing CaO/Na2O, which is consistent with the trend of the melting temperature of modified melting-separated red mud.
- (2)
- The suitable fiber-forming temperature interval of modified melting-separated red mud shows a trend of increasing–decreasing–increasing with increasing CaO/Na2O. Considering the feasibility of preparing slag wool from modified melting-separated red mud, the CaO/Na2O ratio in the modified raw material system should not be higher than 3.0.
- (3)
- For CaO/Na2O ratios from 2.6 to 5.0, the precipitated mineral phases of modified melting-separated red mud during the cooling process mainly include nepheline (NaAlSiO4), anorthite (Ca2AlSi2O7, CaAl2Si2O8), perovskite (CaTiO3), melilite (Ca2Al3O7), and albite (Na2CaAl4O8, NaAlSi3O8), and the crystallization temperature first increases and then decreases. When the CaO/Na2O is 4.0, the maximum crystallization temperature of the modified melting-separated red mud during the cooling process is 1450 °C, and the increase in the crystallization temperature of the melt is not significant when the CaO/Na2O increases from 2.6 to 4.0. When the CaO/Na2O is greater than 4.0, the onset crystallization temperature of the melt decreases significantly.
- (4)
- The slag wool prepared from modified melting-separated red mud with different CaO/Na2O ratios has a smooth surface and a grayish yellow color, and the fibers are arranged crosswise and contain a small amount of slag balls. The diameters of the slag balls are all less than 7 µm, with an average diameter of 5.93 µm, and the slag ball content is 5.83%. With increasing CaO/Na2O, the diameter of the slag wool gradually decreases, but the variation is insignificant, and the slag ball content gradually increases, with a significant increase when the CaO/Na2O is greater than 3.0.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Raw Material | Al2O3 | SiO2 | CaO | Na2O | TiO2 | Fe2O3 | MgO | K2O | MnO | Other |
---|---|---|---|---|---|---|---|---|---|---|
Melting-separated red mud | 32.31 | 27.26 | 10.62 | 11.16 | 7.23 | 7.56 | 2.14 | 0.30 | 0.13 | 1.29 |
Water-quenched blast furnace slag | 14.47 | 28.32 | 38.72 | 0.32 | 2.16 | -- | 11.28 | 0.46 | 0.38 | 3.89 |
Quicklime | -- | 1.28 | 90.0 | -- | -- | -- | 1.56 | -- | -- | 7.16 |
CaO/Na2O | Quicklime | Chemical Composition | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
SiO2 | Al2O3 | CaO | Na2O | TiO2 | Fe2O3 | MgO | K2O | MnO | Other | ||
2.6 | 0 | 27.61 | 26.36 | 19.98 | 7.55 | 5.54 | 5.04 | 5.19 | 0.35 | 0.21 | 2.17 |
3.0 | 2.88% | 26.86 | 25.60 | 22.00 | 7.33 | 5.38 | 4.89 | 5.08 | 0.34 | 0.21 | 2.31 |
4.0 | 10.20% | 24.92 | 23.67 | 27.12 | 6.78 | 4.98 | 4.52 | 4.82 | 0.32 | 0.19 | 2.68 |
5.0 | 16.49% | 23.27 | 22.01 | 31.53 | 6.31 | 4.63 | 4.21 | 4.59 | 0.70 | 0.29 | 2.46 |
CaO/Na2O | 2.6 | 3.0 | 4.0 | 5.0 |
Activation energy of particle movement | 225.38 | 239.78 | 389.20 | 302.4 |
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Du, P.; Zhang, Y.; Long, Y.; Xing, L. Investigation of Preparation of Slag Wool from Melting-Separated Red Mud. Crystals 2023, 13, 1645. https://doi.org/10.3390/cryst13121645
Du P, Zhang Y, Long Y, Xing L. Investigation of Preparation of Slag Wool from Melting-Separated Red Mud. Crystals. 2023; 13(12):1645. https://doi.org/10.3390/cryst13121645
Chicago/Turabian StyleDu, Peipei, Yuzhu Zhang, Yue Long, and Lei Xing. 2023. "Investigation of Preparation of Slag Wool from Melting-Separated Red Mud" Crystals 13, no. 12: 1645. https://doi.org/10.3390/cryst13121645