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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 48371 (07)
- University: Sharif University of Technology
- Department: Materials Science and Engineering
- Advisor(s): Uzebashizadeh, Hossein
- Abstract:
- Red mud, one of the most important industrial wastes, is produced from the Bayer process during the production of alumina and called as wastes. Red mud is usually composed of iron oxides, titanium, aluminum, silisium, calcium, sodium and etc. the presented work is based on the components of red mud and their applications in the preparation of ceramics and its purpose is to recover the bauxite waste and to use it in the preparation of ceramic compounds as an inexpensive source of starting material. To this end, in order to phase recognition of the produced compounds and to examine the presented compounds, XRD analysis and XRF analysis was used, respectively. Then, TGA and DSC analyses were used to determine phase changes and also to measure the sintering temperature range. All the samples containing different percentages of red mud and clay were prepared and sintered at 1000, 1100 and 1200 oC, respectively; then, chemical and physical properties of each of these samples including pressure strength, bending strength, permeability, water absorbance, density and so on were determined to find the optimal condirions for the production of the samples. According to the results, the main components of red mud are Al2O3, SiO2, Fe2O3, Na2O, CaO. Results also showed that in all sintering temperature, density was increased as water absorption and permeability were decreased. The maximum pressure strength was obtained 120.79 MPa at 1200 oC as sintering temperature for the RC (85:15). The bending strength of the same sample was 14.28 MPa at the same temperature. Density was between 2.5-3 g/cm3 at sintering temperature of 1200 oC. The permeability and water absorption of the optimal sample were also 2.15% and 0.74% respectively. Some of the samples were also glazed to investigate the characteristics of the prepared red mud as chromophere. In all these cases, the surfaces of the samples were smooth and there were no crack on them indicating matching between thermal expansion coefficient of the glaze and body. All the results were in accord with literatures and the presented standards for bricks
- Keywords:
- Red Mud ; Alumina ; Glazes ; Bayer Process ; Bauxite ; Clag Brick
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