Feedback | Join Now

HOME | CURRENT | ARCHIVES | ANNOUNCEMENTS | ONLINE SUBMISSION | RESOURCES | ABOUT US
 
Transactions of the INDIAN CERAMIC SOCIETY   Vol. 80  2021
Manufacture of a High Temperature Structural Insulator (HTSI) Using Electrofilter Powders Generated in the Bayer Process
José Sancho-Gorostiaga,a Antonio Bernardo-Sánchez,b José Pedro Sancho-Martínez,a Daniel Fernández-Gonzáleza, * and Luis Felipe Verdejaa
Pages : 163-173
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 cm3 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 100oC for 24 h, and after that, subjected to pre-sintering by heating up to 1050oC, and finally it was sintered at 1400o or 1450oC 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 1400oC for 24 h with no appreciable dimensional changes. [Keywords: Bayer electrofilter powder (EP), High temperature structural insulator (HTSI), Hot wall insulators, Mullite, Alumina, Waste, Circular economy]
Full text : Subscribe to Download Full Text
[Go Back]
 
MAIN PAGE | SITE MAP | PRIVACY POLICY | TERMS & CONDITIONS  | CONTACT US | FEEDBACK
Copyright Protected 2008, The Indian Ceramic Society. All right reserved.

Developed By : Hi-Tech Soft & Multimedia