China's Refractories ›› 2020, Vol. 29 ›› Issue (2): 6-10.DOI: 10.19691/j.cnki.1004-4493.2020.02.002
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Application Performance of Microporous Sintered Alumina in Alumina Magnesia Castables for Ladles
HE Jian, LYU Xusheng*(
), ZHANG Jialiang, ZHOU Wei, LI Yin
- Jiangsu Jingxin New Materials Co., Ltd., Yangzhou 225264, China
-
Revised:2021-05-13Online:2020-06-15Published:2020-06-15 -
Contact:LYU Xusheng -
About author:He Jian, born in 1983, finished his junior college education from Fuzhou Command College of The Chinese People's Armed Police Forces in 2006. He has been the general manager of Jiangsu Jingxin New Materials Co., Ltd. since 2015. He won many prizes such as Jiangdu District Chief Quality Award in 2014, Yangzhou City Mayor Quality Award in 2015, Top Ten Young Entrepreneurship Stars in Jiangdu District in 2016, and Advanced Quality Individuals in Jiangdu District in 2017.
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HE Jian, LYU Xusheng, ZHANG Jialiang, ZHOU Wei, LI Yin. Application Performance of Microporous Sintered Alumina in Alumina Magnesia Castables for Ladles[J]. China's Refractories, 2020, 29(2): 6-10.
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URL: http://www.cnref.cn/EN/10.19691/j.cnki.1004-4493.2020.02.002
Table 1 Physical and chemical properties
| Samples | Al2O3 /mass% | Bulk density /(g · cm-3) | Apparent porosity /% | Closed porosity /% | Water absorption /% |
|---|---|---|---|---|---|
| Common sintered alumina | 99.3 | 3.55 | 3.6 | 6.5 | 1.02 |
| Microporous sintered alumina | 99.2 | 3.50 | 3.8 | 7.6 | 1.09 |
Table 1 Physical and chemical properties
| Samples | Al2O3 /mass% | Bulk density /(g · cm-3) | Apparent porosity /% | Closed porosity /% | Water absorption /% |
|---|---|---|---|---|---|
| Common sintered alumina | 99.3 | 3.55 | 3.6 | 6.5 | 1.02 |
| Microporous sintered alumina | 99.2 | 3.50 | 3.8 | 7.6 | 1.09 |
Fig. 1 Fracture morphology of common sintered alumina
Fig. 1 Fracture morphology of common sintered alumina
Fig. 2 Fracture morphology of microporous sintered alumina Fig. 3 Pore size distribution
Fig. 2 Fracture morphology of microporous sintered alumina Fig. 3 Pore size distribution
Fig.3 Pore size distribution
Fig.3 Pore size distribution
Table 2 Thermal conductivity of two kinds of alumina at different temperatures /(W · m-1 · K-1)
| Samples | 25 ℃ | 300 ℃ | 500 ℃ | 800 ℃ |
|---|---|---|---|---|
| Common sintered alumina | 26.114 | 12.759 | 9.202 | 7.896 |
| Microporous sintered alumina | 25.851 | 9.725 | 5.604 | 4.864 |
Table 2 Thermal conductivity of two kinds of alumina at different temperatures /(W · m-1 · K-1)
| Samples | 25 ℃ | 300 ℃ | 500 ℃ | 800 ℃ |
|---|---|---|---|---|
| Common sintered alumina | 26.114 | 12.759 | 9.202 | 7.896 |
| Microporous sintered alumina | 25.851 | 9.725 | 5.604 | 4.864 |
Table 3 Chemical composition of slag /mass%
| SiO2 | Al2O3 | CaO | MgO | Fe2O3 | MnO |
|---|---|---|---|---|---|
| 11.23 | 2.43 | 46.84 | 9.24 | 27.87 | 2.38 |
Table 3 Chemical composition of slag /mass%
| SiO2 | Al2O3 | CaO | MgO | Fe2O3 | MnO |
|---|---|---|---|---|---|
| 11.23 | 2.43 | 46.84 | 9.24 | 27.87 | 2.38 |
Fig. 4 Microstructure of sintered alumina aggregates after slag corrosion
Fig. 4 Microstructure of sintered alumina aggregates after slag corrosion
Table 4 EDS results of isolation layer /mass%
| Elements | Ca | Al | Fe | O |
|---|---|---|---|---|
| Contents | 4.91 | 46.12 | 2.69 | 46.28 |
Table 4 EDS results of isolation layer /mass%
| Elements | Ca | Al | Fe | O |
|---|---|---|---|---|
| Contents | 4.91 | 46.12 | 2.69 | 46.28 |
Table 5 High temperature properties comparison of two castables
| Castables | Refrac-toriness under load, T0.6 /℃ | Hot modulus of rupture /MPa | Retention ratio of MOR after 5 thermal shock cycles /% | Thermal conductivity at 800 ℃ / (W·m-1·K-1) |
|---|---|---|---|---|
| Common castable | 1 520 | 8.32 | 18.10 | 0.93 |
| Microporous castable | 1 518 | 8.24 | 22.57 | 0.79 |
Table 5 High temperature properties comparison of two castables
| Castables | Refrac-toriness under load, T0.6 /℃ | Hot modulus of rupture /MPa | Retention ratio of MOR after 5 thermal shock cycles /% | Thermal conductivity at 800 ℃ / (W·m-1·K-1) |
|---|---|---|---|---|
| Common castable | 1 520 | 8.32 | 18.10 | 0.93 |
| Microporous castable | 1 518 | 8.24 | 22.57 | 0.79 |
Table 6 Chemical composition of converter final slag /mass%
| SiO2 | Al2O3 | CaO | MgO | Fe2O3 | MnO | P2O5 |
|---|---|---|---|---|---|---|
| 15.51 | 2.07 | 34.75 | 7.12 | 31.10 | 2.38 | 2.00 |
Table 6 Chemical composition of converter final slag /mass%
| SiO2 | Al2O3 | CaO | MgO | Fe2O3 | MnO | P2O5 |
|---|---|---|---|---|---|---|
| 15.51 | 2.07 | 34.75 | 7.12 | 31.10 | 2.38 | 2.00 |
Fig. 5 Static crucible slag corrosion test
Fig. 5 Static crucible slag corrosion test
Table 7 Corrosion and penetration of castables
| Castables | Corrosion ratio /% | Penetration ratio /% |
|---|---|---|
| Common castable | 31.1 | 60.4 |
| Microporous castable | 9.5 | 55.3 |
Table 7 Corrosion and penetration of castables
| Castables | Corrosion ratio /% | Penetration ratio /% |
|---|---|---|
| Common castable | 31.1 | 60.4 |
| Microporous castable | 9.5 | 55.3 |
Fig. 6 Residual thickness comparison of two blocks
Fig. 6 Residual thickness comparison of two blocks
Fig. 7 Temperature field simulation of ladle outer wall
Fig. 7 Temperature field simulation of ladle outer wall
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