The Reaction Behavior of 2CaO·SiO2 with CaO–SiO2–FeO–P2O5 Slag
Abstract
:1. Introduction
2. Experimental
2.1. Sample Preparation
2.2. Experimental Apparatus and Procedure
3. Results and Discussion
3.1. Diffusion of P2O5 in C2S
3.2. Clarification of Generated Solid Solution in Rim of C2S
3.3. Influence of Addition of BaO in C2S
4. Conclusions
- 1.
- The phosphorus-rich phase in the slag mainly existed in the form of an nC2S–C3P solid melt. Phosphorus existed in the form of an nC2S–C3P solid melt. The diffusion coefficient (D) of phosphorus in C2S was 9.23 × 10−14 m2·s−1. There was a positive correlation between the P2O5 and FeO contents in the C2S solid solution.
- 2.
- The surfaces of the generated solid solution layer and the shed small particles were irregular and showed some gully shapes. The phosphorus content of the raised portion of the gully shape was lower than that at the bottom. The C2S–C3P solid solution with a high phosphorus content gradually peeled off owing to residual stress.
- 3.
- The C2S solid solution was more compact and its density was improved by the addition of BaO. The Ca in C2S could be replaced by Ba. The small particles of the solid solution were more easily generated from the C2S body with the addition of BaO, which was beneficial for improving the phosphorus partition between the C2S solid phase and the liquid phase of the slag.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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CaO | SiO2 | FeOx | P2O5 | R(CaO/SiO2) |
---|---|---|---|---|
41.92 | 36.08 | 20.00 | 2.00 | 1.16 |
Point | Oxygen | Aluminum | Silicon | Phosphorus | Calcium | Ferrum | ||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
wt.% | at.% | wt.% | at.% | wt.% | at.% | wt.% | at.% | wt.% | at.% | wt.% | at.% | |
1 | 23.51 | 41.16 | 0.33 | 0.34 | 19.21 | 19.16 | 1.62 | 1.46 | 51.34 | 35.88 | 3.99 | 2.00 |
2 | 23.45 | 41.02 | 0.07 | 0.07 | 19.43 | 19.36 | 2.27 | 2.05 | 50.93 | 35.57 | 3.86 | 1.93 |
3 | 23.47 | 41.10 | 0.06 | 0.07 | 18.92 | 18.87 | 1.96 | 1.77 | 52.20 | 36.49 | 3.39 | 1.70 |
4 | 24.41 | 42.29 | 0.13 | 0.13 | 18.97 | 18.72 | 2.12 | 1.90 | 51.08 | 35.33 | 3.30 | 1.64 |
Sample | CaO | SiO2 | P2O5 | BaO |
---|---|---|---|---|
1 | 60.36 | 19.64 | 20.00 | 0 |
2 | 57.11 | 17.89 | 20.00 | 5.00 |
3 | 53.85 | 16.15 | 20.00 | 10.00 |
4 | 50.59 | 14.41 | 20.00 | 15.00 |
CaO | SiO2 | FeOx | BaO | P2O5 | R(CaO/SiO2) |
---|---|---|---|---|---|
39.20 | 33.80 | 20.00 | 5.00 | 2.00 | 1.16 |
Point | Oxygen | Aluminum | Silicon | Phosphorus | Calcium | Barium | Ferrum | |||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
wt.% | at.% | wt.% | at.% | wt.% | at.% | wt.% | at.% | wt.% | at.% | wt.% | at.% | wt.% | at.% | |
1 | 39.98 | 61.15 | 0.82 | 0.74 | 12.40 | 10.80 | 1.85 | 1.46 | 38.29 | 23.38 | 1.79 | 0.32 | 4.88 | 2.14 |
2 | 33.72 | 52.49 | 0.71 | 0.66 | 17.20 | 15.25 | 1.91 | 1.54 | 47.32 | 29.41 | 0.98 | 0.18 | 1.06 | 0.47 |
3 | 39.12 | 59.71 | 0.65 | 0.59 | 12.45 | 10.82 | 1.95 | 1.54 | 43.91 | 26.76 | 1.01 | 0.18 | 0.91 | 0.40 |
4 | 35.62 | 55.14 | 0.65 | 0.60 | 15.75 | 13.89 | 2.21 | 1.77 | 43.85 | 27.10 | 1.21 | 0.22 | 2.91 | 1.29 |
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Song, Y.; Hu, X.; Chou, K. The Reaction Behavior of 2CaO·SiO2 with CaO–SiO2–FeO–P2O5 Slag. Materials 2022, 15, 6594. https://doi.org/10.3390/ma15196594
Song Y, Hu X, Chou K. The Reaction Behavior of 2CaO·SiO2 with CaO–SiO2–FeO–P2O5 Slag. Materials. 2022; 15(19):6594. https://doi.org/10.3390/ma15196594
Chicago/Turabian StyleSong, Yansong, Xiaojun Hu, and Kuochih Chou. 2022. "The Reaction Behavior of 2CaO·SiO2 with CaO–SiO2–FeO–P2O5 Slag" Materials 15, no. 19: 6594. https://doi.org/10.3390/ma15196594