More

Characteristics and application of porous ceramic membrane

For the development of micro filtration, ultra thin porous ceramic filter and more than satisfied for the filtration and polymerization of ceramic film of inorganic ceramic membrane in century American scientists for the first time using porous ceramic membrane to separate the corrosive UF 6 isotope. Because of SiO2, Al2O3, MgO, ZrO2, TiC, UC and other inorganic silicate materials prepared by inorganic membranes with polymer organic film incomparable superiority, since twenty-first Century, the development and application of inorganic ceramic membrane has been further development, in addition to the nuclear industry, aerospace, food industry, chemical industry, biological the industrial application and development, especially in the field of environment caused the attention of the world.

Modern technology has developed a world leading level for microfiltration (1nm to 30nm), ultrafiltration (30nm to 3nm) and nanofiltration (3nm to 0.9nm) with porous ceramic membrane, and has developed a variety of specifications and the use of the industrial application of complete separation and filtration devices, such as the three level of ceramic membrane with radiation material waste water purification device. This is used for microfiltration ultrafiltration nanofiltration with the porous ceramic film is a kind of separation of substances and energy transmission medium diaphragm, the film can be made according to the actual needs of pore size (micron and sub micron and nanometer micropore), all of the films have been defined by blocking filter value, such as ultrafiltration (for the purification of such as latex emulsion cleaning, sterilization and other chemical substances) and nanofiltration (for biological ceramic carrier, curing microbial and cell membrane after curing for the production of proteins and vaccines such as bioactive substances). Among them, the diameter of 0.9nm our nanofiltration membrane is currently the world's smallest known aperture of nanofiltration ceramic membrane, blocking the filter value to 450g/mol, if the definition of the blocking filter is <1000g/mol, the experiment result shows that it can prevent the SO of 42 up to 90%.

Porous ceramic carrier is the basis of the above three kinds of ceramic filter membrane, and determines the shape of the filter assembly and the size of the ceramic membrane area. I developed the filter components in the high to 450 degrees C temperature and 60 bar atmospheric pressure environment can be completely normal work, can be used to wash a variety of acid and alkali liquid or steam. These ceramic carriers are produced by different production processes, such as flat plate, capillary tube, single channel, porous pipe and so on. The thickness of the plate carrier is 1mm, and the ceramic bonding technique can be used to adhere to a plurality of disk bodies when required. Capillary ceramic carrier diameter up to 1.1mm. The size of the porous ceramic carrier is different (the standard size of the 22 channel carrier is wide 101mm, thick 6mm, channel diameter 3mm). The specific shape and size of the carrier depends on the area of the ceramic membrane and the use of the separation filter, and is used in combination with the stainless steel sleeve body.

In the film interval to one or several layers of porous ceramic body with special coating process on the porous ceramic substrate roughness on the ceramic substrate can be a variety of shapes of the plane or pipeline, its preparation according to the separation requirements by sol gel process, foaming process, organic foam impregnation process, adding pore forming agent preparation process system. On both sides of the membrane material particle size, the diffusion coefficient and solubility difference, the mass transfer process in a certain driving force difference and concentration difference, potential difference or chemical potential under. The difference in the rate of mass transfer can lead to the selective permeation, which leads to the separation of the mixture.

The filtration and separation of ceramic membrane in environmental protection is very wide. In the wastewater of textile printing and dyeing factory or filtration by ceramic film, not only can remove harmful chemicals, chemical agent on the color can also be dissolved in the water of separation and recovery and recycle utility. Ceramic film can also be transformed into soluble metal ions into insoluble metal carbonate to reduce heavy metals in industrial wastewater, when metal carbonate on the film accumulation to a certain amount of washing and another filter recovery, economic benefit is very obvious.