Characteristics of honeycomb ceramics: Ceramic materials can be widely used in various environmental protection fields due to their high strength, high temperature resistance, corrosion resistance and wear resistance, such as automobile exhaust emissions. 1. The development of porous ultra-thin ceramics and polymeric ceramic thin film ceramic inorganic membranes for microfiltration, ultrafiltration and nanofiltration began in the first century. American scientists used porous ceramic membranes to separate highly corrosive UF 6 isotopes. The inorganic membrane prepared by inorganic silicate materials such as SiO 2 , Al 2 O 3 , MgO, ZrO 2 , TiC, UC has the superiority of polymer organic film. The development and application of inorganic ceramic film since the 21st century Further development has been made. In addition to the traditional nuclear industry, aerospace, food industry, chemical industry, biology and other industries, the application and development in the environmental field has attracted the attention of all countries in the world. Germany Inlay Precision Ceramics Co., Ltd. has developed the world's leading porous ceramic film for microfiltration (1?m to 30nm), ultrafiltration (30nm to 3nm) and nanofiltration (3nm to 0.9nm). Developed a complete set of separation and filtration devices for industrial applications with various specifications and uses, such as a three-stage ceramic membrane filtration purification treatment device for wastewater containing radioactive materials. The porous ceramic membrane used for microfiltration, ultrafiltration and nanofiltration is an intermediate medium membrane for material separation and energy transmission. The membrane is made to have a desired pore size (micron, submicron and nanometer) according to actual needs. Micropores), all membranes have defined blocking filtration values ​​such as ultrafiltration (for cleaning of emulsion turbid liquids, sterilization and other chemicals) and nanofiltration (for solidification of microorganisms and cells) Bioceramic carriers, cured biofilms are used to produce biologically active substances such as proteins and vaccines). Among them, our 0.9nm pore size nanofiltration membrane is the nanofiltration ceramic membrane with the smallest pore size known in the world. The blocking filtration value is as small as 450g/mol. If the defined blocking filtration value is <1000g/mol, the test proves that Blocking of SO 4 2 - is as high as 90%. The porous ceramic support is the basis of the above three ceramic filter membranes, and determines the shape of the filter assembly and the size of the ceramic membrane. The filter components developed by our company can work normally at temperatures up to 450 ° C and 60 bar atmospheric pressure, and can be washed with various acid and alkali or steam. These ceramic carriers are manufactured by various production processes in the form of flat plates, capillary tubes, single-hole channels, porous tubes, and the like. The plate carrier has a thickness of 1 mm and can be bonded together by a plurality of disc-shaped body layers by ceramic bonding techniques as needed. The diameter of the capillary ceramic carrier can be as small as 1.1 mm. Porous pipe ceramic carriers vary in size (the standard size of the 22-channel carrier is 101 mm wide, 6 mm thick, and 3 mm hole diameter). The specific shape and size of the carrier depends on the ceramic film area and the separation and filtration application, and is used in combination with the stainless steel casing. The film is separated by one or several layers of porous ceramic bodies, and is coated on a rough porous ceramic substrate by a special process. The ceramic substrate can be a plane or a pipe of various shapes, and the preparation can be performed by a sol-gel process according to separation requirements. Process, organic foam impregnation process, addition of pore former process, etc. The mass particles on both sides of the separation membrane undergo mass transfer processes driven by a certain force difference, concentration difference, potential difference or chemical difference due to differences in size, diffusion coefficient or solubility. Differences in mass transfer rates result in selective permeation, which in turn causes separation of the mixture. We have all the nano ceramic coating process technologies known in the world, including sol coating technology. Conventional coating techniques such as dip coating, spray coating, spin coating, etc. can also be used to make the sol film, which is then converted into a ceramic film by firing or curing. Various coating technologies are suitable for different product applications. The hydrated coating technology produces a so-called colloidal solution, and the discrete particles are very stable due to the surface charge ratio. The sol layer is fired at a temperature of from 400 ° C to 600 ° C to form a interstitial porous film such as TiO 2 , ZrO 2 and γ-Al 2 O 3 , which is very suitable for ultrafiltration applications. The oligomeric polymerization solution with free hydroxyl groups is formed by controlled hydrolysis. This formation can be achieved by adding a certain amount of water or adding a certain complexing agent that inhibits water decomposition. The hydroxyl group is polycondensed at 200 ° C-500. Curing at °C, forming a ceramic microporous network system. Thus, TiO 2 , ZrO 2 , Al 2 O 3 and SiO 2 amorphous microporous ceramic membranes suitable for nanofiltration and nanoscale gas separation can be produced. The nanofiltration membrane developed by our company has a pore structure different from that of microfiltration and ultrafiltration membranes characterized by interparticle pore structure. It is an amorphous, unstructured microporous structure without single particles, which is coated by polymerized sol technology. to make. The developed ceramic film is prepared according to the specific needs of the size of the material to be filtered and separated, and the required pore size and the number of pores are determined. Therefore, each film has a defined blocking filter value depending on the use, that is, this The pore size and number of pores of the ceramic film can be adjusted during preparation depending on the application. In addition, the ceramic film technology is based on physical principles, without the aid of chemicals, without secondary pollution, high efficiency, low energy consumption, and easy operation. Very good chemical stability, corrosion resistance, high temperature resistance, stable structural shape, high mechanical strength, can withstand the impact of high-speed particle dust, can be applied in high pressure and high temperature and corrosive environment, is conducive to increase the flow rate, and can effectively on ceramics The film is subjected to acid and alkali, high pressure backflushing and high temperature steam cleaning. The liquid phase and gas separation complete industrial application equipment using our ceramic membrane has been successfully applied in many practical industrial fields including nuclear industry, aerospace, food industry, medicine, environmental protection, etc., including purification treatment of radioactive wastewater, polymer film. Ultrafiltration purification of inhibiting and excluding proteins combined with ceramic film, ceramic membrane bioreactor for purifying wastewater containing heavy metals and organic matter, ceramic membrane ultrafiltration purification device for purifying rolled emulsion, wastewater for producing glass fiber The two-stage membrane filtration purification treatment device and the like. Ceramic membranes have a wide range of applications for filtration and separation in environmental protection. When the colored wastewater of the textile or printing and dyeing plant is purified and filtered by the ceramic film, not only various harmful chemicals can be removed, but also the chemical toner molecules dissolved in the water can be separated and recycled and recycled again. Thin film ceramics can also reduce heavy metals in industrial wastewater by converting soluble metal ions into insoluble metal carbonates, which are washed when the metal carbonate on the film is deposited to a certain amount and then recovered by another filter. The economic benefits are very obvious.
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