| Title |
Manufacture of a High Temperature Structural Insulator (HTSI) Using Electrofilter Powders Generated in the Bayer Process |
| ID_Doc |
7231 |
| Authors |
Sancho-Gorostiaga, J; Bernardo-Sánchez, A; Sancho-Martínez, JP; Fernández-González, D; Verdeja, LF |
| Title |
Manufacture of a High Temperature Structural Insulator (HTSI) Using Electrofilter Powders Generated in the Bayer Process |
| Year |
2021 |
| Published |
Transactions Of The Indian Ceramic Society, 80, 3 |
| DOI |
10.1080/0371750X.2021.1915872 |
| Abstract |
Electrofilter powder (EP) is a residue generated in large amounts during the calcination of aluminium hydroxide in the Bayer process. The production of high temperature structural insulator (HTSI) using EP is proposed. Different tests were made using different proportions of the starting materials, although the optimal mixture contained (in wt%) 52% EP, 14.7% silica fume (or quartz), 12% refractory aluminous cement and 21.3% water. Besides, 900 cm(3) of polystyrene flakes were added to the mixture to promote a fine structure of pores. The brick was formed using manual mixing and vibration compacting in silicone molds. Then, it was dried at 100 degrees C for 24 h, and after that, subjected to pre-sintering by heating up to 1050 degrees C, and finally it was sintered at 1400 degrees or 1450 degrees C for 2 h. At the end of the process, the brick comprised 63% mullite, 24% anorthite and 13% corundum, with the following properties: density values within 0.75 and 0.80 g.cm(-3), thermal conductivity values within 0.25 and 0.29 W.m(-1).K-1, compressive strength values higher than 3.5 MPa, total porosity in the range 75-79% and overheat stability at 1400 degrees C for 24 h with no appreciable dimensional changes. |
| Author Keywords |
Bayer electrofilter powder (EP); High temperature structural insulator (HTSI); Hot wall insulators; Mullite; Alumina; Waste; Circular economy |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:000685990100001 |
| WoS Category |
Materials Science, Ceramics |
| Research Area |
Materials Science |
| PDF |
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