| Zhengzhou Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences | Host |
| Citation: |
CHEN Xinyi, FANG Minghao, WANG Qi, LIU Yangai, WU Xiaowen, MI Ruiyu, HUANG zhaohui, MIN Xin. Low-Temperature Preparation of Feldspar-Corundum Composite Ceramics from Red Mud[J]. Conservation and Utilization of Mineral Resources, 2021, 41(6): 103-111. doi: 10.13779/j.cnki.issn1001-0076.2021.06.012
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Low-Temperature Preparation of Feldspar-Corundum Composite Ceramics from Red Mud
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Abstract
Using bayer red mud as the main raw material, adding vanadium clay clinker and lithium porcelain stone, feldspar-corundum ceramics were prepared at low temperature. The phase composition and morphology of ceramics were analyzed by X-ray diffractometer (XRD) and scanning electron microscope (SEM). The effects of the amount of red mud and sintering temperature on the volume density, shrinkage, water absorption, porosity and compressive strength of ceramics were studied. The results show that: When the amount of red mud is 60% and the sintering temperature is 1 050 ℃, the properties of the multiphase ceramics are the best, and the phase composition is anhydrite, corundum, hematite, quartz, glass phase and a small amount of mullite phase. The volume density is 1.85 g/cm3, the shrinkage rate is 7.34%, the water absorption rate is 19.87%, and the compressive strength is 79.48 mpa. The dissolution experiment of harmful components further showed that sodium, potassium, calcium and other harmful elements were stabilized in the product, which has a wide application prospect in the field of wall decoration and refractory materials.
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Keywords:
- red mud /
- ceramic /
- low temperature /
- solidification of harmful elements
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References
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CHEN Xinyi, FANG Minghao, WANG Qi, LIU Yangai, WU Xiaowen, MI Ruiyu, HUANG zhaohui, MIN Xin. Low-Temperature Preparation of Feldspar-Corundum Composite Ceramics from Red Mud[J]. Conservation and Utilization of Mineral Resources, 2021, 41(6): 103-111. doi: 10.13779/j.cnki.issn1001-0076.2021.06.012
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Figure 1.
XRD pattern of red mud raw materia
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Figure 2.
XRD pattern of lithium porcelain stone (a) and bauxite clinker (b)
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Figure 3.
SEM images of red mud (a) bauxite clinker (b) and lithium porcelain (c)
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Figure 4.
XRD patterns of red mud sintered at different temperatures
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Figure 5.
XRD patterns of ceramics with different red mud contents sintered at different temperatures
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Figure 6.
The change rule of volume density and linear shrinkage of ceramics with red mud content of 60% sintered at different temperatures
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Figure 7.
Water absorption and apparent porosity of ceramics sintered at different temperatures with red mud content of 60%
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Figure 8.
Compressive strength diagram of ceramics with 60% red mud added at different sintering temperatures
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Figure 9.
The change rule of volume density and linear shrinkage of ceramics with different amounts of red mud after sintering at 1 050 ℃
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Figure 10.
Diagram of water absorption and apparent porosity of ceramics sintered at 1050℃ with different amounts of red mud
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Figure 11.
Compressive strength of ceramics sintered at 1 050 ℃ with different amounts of red mud
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Figure 12.
Microstructure of ceramics sintered at different temperatures with red mud content of 60%
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Figure 13.
Micromorphology of ceramics sintered at 1 050 ℃ with different amounts of red mud