LI Miaoyu 1, GUO Yani 1, TONG Zhi 1, WU Kui 2
(1. Xi’an Polytechnic University, Xi’an 710000, Shaanxi, China; 2. Shaanxi Modern Architectural Design and
Research Institute, Xi’an 710000, Shaanxi, China)
Abstract: Owing to the advantages of high filtration accuracy, resistance to strong acids and alkalis, stable physical and chemical properties and long service life, Ceramic membranes have been widely used in wastewater treatment and gas separation. As an important part, the support provides pore structure and flexural strength for ceramic membranes. The support of gangue ceramic membrane was prepared by using extrusion method with gangue and loess as the main raw materials, carbon powder as the poro-forming agent and carboxymethyl cellulose (CMC) as the binder. The effects of sintering temperature and poro-forming agent content on the physical and chemical properties of the support, such as flexural strength, pure water flux, crystal phase evolution and microstructure, were studied. It is demonstrated that flexural strength and pure water flux of the support rose gradually with the increase of sintering temperature. The optimal performance of the proppant was achieved at a sintering temperature of 1125 ℃ and a carbon powder addition of 10 wt.%. A low-cost high-performance inorganic ceramic membrane support, with a pure water flux of 40294.69 L·m−2·h−1·MPa−1, a flexural strength of 23.57 MPa, a sensible porosity of 29.63%，a pore size of 2504.7 nm, a rate of acid and alkali loss of 1.63%/1.02% and a porosity of 49.9%, can be produced.
Key words: coal gangue; ceramic membrane support; sintering temperature; poro-forming agent content; performance study