Fabrication of cordierite filter by in-situ solidification for high temperature dust collection

• Published in: Powder technology Vol. 172; no. 1; pp. 57 - 62
• Main Authors: Fuji, Masayoshi, Shiroki, Yoshihiro, Menchavez, Ruben L., Takegami, Hiroaki, Takahashi, Minoru, Suzuki, Hisao, Izuhara, Seiji, Yokoyama, Toyokazu
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.03.2007; Elsevier
• Subjects: Applied sciences; Chemical engineering; Cordierite filter; Dust collection; Exact sciences and technology; Gelcasting; Holey filter; Hydrodynamics of contact apparatus; Miscellaneous; Sintering, pelletization, granulation; Solid-solid systems; Dust collection; Gelcasting; Cordierite filter; Holey filter; In situ; Polymerization; Hydrodynamics; Solidification; Design; Gas permeability; Dust; Foam; Honeycomb structure; Pressure drop; Sintering; Humidity; Thermal expansion coefficient; Ceramic materials
• ISSN: 0032-5910; 1873-328X
• DOI: 10.1016/j.powtec.2006.10.029

Cordierite ceramic filters have been shown a potential candidate for a high temperature dust collection, owing to its very low thermal expansion coefficient characteristic as an attribute of excellent thermal shock resistance. It is preferable that a design of porous cordierite filter should have low pressure drop with high permeability while keeping the structural integrity. This study describes a simple and direct approach for fabricating a porous cordierite filter with honeycomb-type structure by introducing various non-through holes into mechanically foamed slurry, which is subsequently in-situ solidified by polymerization reaction. The gelcasting cordierite-based slurry was mechanically foamed in nitrogen-filled chamber. The resulting foamed slurry was cast directly into circular molds equipped with a cover having different number of pins. The gelled-bodies were carefully dried at 25 °C with a controlled humidity, followed by sintering under optimized condition. The dust collection performance, pressure drop, and gas permeability were evaluated as a function of the number of non-through holes in porous cordierite. Based on the results of the tests, the holey porous cordierite filter offered a better filter design for dust collection application. Fig. 1. Mold assembly for porous cordierite body with non-through holes. Teflon mold (A, B, D), cover-with- pins mold (A, B), cross-section with non-through holes (C). [Display omitted]