The properties of porous ceramic membrane

Membrane separation technology is a kind of high-tech developed rapidly after 1960s. It is widely used in chemical industry, food, medicine, environmental protection and other fields because of its high separation efficiency, convenient operation, compact equipment and energy saving. Porous ceramic membrane has attracted more and more attention because of its stable physical and chemical properties, high mechanical strength and high temperature resistance. Especially after the 1990s, the ceramic membrane technology has developed rapidly, and the annual growth rate of its application market has reached 30 ~ 35%.

Ceramic membrane is a kind of inorganic porous membrane with separation function, which is made of ceramic material as the medium. It is mainly based on the principle of "screening" and driven by pressure difference to realize the separation of liquid-solid and gas-solid materials. At present, the ceramic membrane materials developed and applied mainly include alumina, titanium oxide, zirconia, silicon carbide, etc., which generally have an asymmetric gradient structure as shown in Figure 1, which is composed of a support body for mechanical support and a film layer for separation. Sometimes, a transition layer is added between the support body and the membrane layer to play the role of transition structure and stress change. The appearance structure of ceramic membrane has developed from the early single hole tube and porous tube to the plate type and large area porous honeycomb type. Compared with the organic membrane which is widely used in industry, ceramic membrane has the following advantages: good chemical stability, acid and alkali resistance and organic solvent resistance; good oxidation resistance; high mechanical strength; no deformation under high pressure or large pressure difference; wear resistance and erosion resistance, which can be regenerated by high pressure backwash; strong anti microbial ability, good antibacterial effect, suitable for medical and biological Engineering; high temperature resistance, up to 1000 ℃; narrow pore size distribution, high separation efficiency, high separation accuracy; non toxic, no secondary pollution, suitable for food and drug treatment; good durability and long service life. But at present, the manufacturing cost of ceramic membrane is high and the membrane area is small, resulting in the huge volume of ceramic membrane equipment, high initial installation cost, and the brittleness of ceramic materials, which brings certain difficulties to the molding and assembly of membrane.

NanoMem® is a high-tech enterprise integrating R&D, production and service of plate ceramic filtration membrane products. We are professional supplier of flat ceramic filtration membrane, plate ceramic filtration membrane unit and MBR system. If you are interested in our products, please contact us at 0086 512 6638 9461 and email: export01@szdasen.com.