65results about How to "Good filtration accuracy" patented technology

A method for preparing a double layered porous hollow fiber membrane and the device and product thereof. The method comprises preparing uncured porous hollow fiber with larger pore diameters as the inner robust supporter of the membrane from thermoplastic polymeric resins by thermal induced phase separation (TIPS) method and then binding an ultra thin coating layer with hydrophilic microfiltration or ultrafiltration function and fine pore diameters prepared on the outer surface of the robust hollow fibers from a solution of the thermoplastic polymeric resins by a coating process using non-solvent induced phase separation (NIPS) method. The double layered porous hollow fiber membranes have such excellent mechanical strength and high water permeation as the membranes prepared by thermal induced phase separation (TIPS) method, such high accurate filtration effect, high hydrophilic effect and high fouling resistance as the membranes prepared by non-solvent induced phase separation (NIPS) method, and high binding force of the membranes between the layers by the above method.

A method for preparing a composite multilayer porous hollow fiber membrane and the device and product thereof. The method comprises preparing uncured porous hollow fibers with larger pore diameters as the inner supporter of the membrane from thermoplastic macromolecule polymer resins by thermal induced phase separation method and then bonding a superthin coating layer with microfiltration or nanofiltration function and small pore diameter prepared on the outer surface of the hollow fibers from a solution of the thermoplastic macromolecule polymer resins by a coating process using non-solvent induced phase separation method. The composite multilayer porous hollow fiber membrane has such excellent mechanical strength and high water flux as the membranes prepared by thermal induced phase separation method, such high precision filter effect and high contamination resistance as the membranes prepared by non-solvent induced phase separation method, and high binding force of the membrane prepared by the above method.

The invention belongs to the field of porous ceramic materials and discloses a silicon carbide filtering film and a low temperature preparation method thereof. The silicon carbide filtering film comprises pure SiC, a surface film layer is prepared from fine grain silicon carbide through accumulation, has the pore diameter of 20 nanometers to 20 micrometers and film layer porosity of 40-50% and has high through porosity, low pressure drop, high strength, good thermal shock resistance and a high usage temperature. Film slurry is prepared from fine silicon carbide particles, an organosilicon precursor and a pore forming agent additive, the surface is spray-coated with the film slurry so that a film layer is formed, and the film layer is dried and sintered so that a pure silicon carbide film is obtained. The organosilicon precursor is cracked to produce a coupling phase, a sintering temperature is low, an aperture structure can be controlled easily, and the film layer can be used in an oxidation atmosphere and in a reduction atmosphere, has strong acid and base resistance and can be used for various high and low temperature fluid filtering purification such as coal gasification chemical engineering, IGCC and PFBC coal gasification generating, and high temperature flue gas, automobile exhaust and water purification.

The invention relates to a supported hydrophilic polyvinylidene fluoride microporous membrane and a preparation method thereof. The pore size of the microporous membrane is 0.1-20 mu m, and the thickness of the microporous membrane is 90-200 mu m. The method comprises the following steps: 1)the preparation of a casting membrane solution, dissolving a polyvinylidene fluoride resin in a solvent firstly, adding hydrophilic components and an additive, and at temperature of 30-80 DEG C, fully stirring the obtained mixture so as to form the uniform and stable casting membrane solution; and 2) membrane formation by phase inversion: casting the casting membrane solution on a support layer, carrying out membrane wiping on the support layer saturating in the casting membrane solution by using a scraper under the condition that a gap between the scraper and the support layer is 15-40 mu m, standing for 10-400 seconds in the air, and after a membrane sequentially passes through a first coagulation bath, a second coagulation bath and a third coagulation bath, taking out the membrane, and drying the membrane,,and then the hydrophilic microporous membrane is obtained. Compared with the prior art, the membrane disclosed by the invention has the advantages of thorough extraction, uniform pore size distribution, better filtering accuracy and filtering efficiency, capability of being applied to continuous mass production, stable product performances, and the like.

A high-density filtering fibreboard is prepared from sepiolite wool, paper pulp fibre, adhesive (polyvinyl alcohol or epoxy resin), wet strengthening agent (polyvinylimine, polyamide epoxy resin, or cyanuramide), and dry strengthening agent (carboxymethyl cellulose or polyacrylamide) through preparing pulp, mixing shaping, baking, and shearing by needed sizes. It has high porosity and filtering throughput.

The invention discloses an inorganic-organic composite film. A support is made of inorganic porous materials and comprises organic materials and cross-linking agents which sequentially coat the support, the thickness of the inorganic porous materials is 1mm-3mm, the thickness of the organic materials is 10-50 micrometers, and the pore diameter of the inorganic-organic composite film is 0.001-1 micrometer. The inorganic-organic composite film has high-strength, impact-resistant, high-precision and high-selectivity filtration performances, and is excellent in renewability. According to a preparation method of the inorganic-organic composite film, after prepared organic material casting solution and the cross-linking agents are poured into a tank, the surfaces of the inorganic porous materials are sequentially coated with the organic material and the cross-linking agents in a spin coating mode, film preparation procedures are finished, operation is simple and convenient, controllability is strong, and stability is high.

The invention relates to a process and device for zero discharge treatment of coal chemical wastewater and belongs to the technical field of water treatment. The process comprises the steps of adding a bio-surfactant into coal wastewater, and then causing the bio-surfactant to undergo electric flocculation treatment; causing electric flocculation sludge to undergo dehydration and incineration treatment; sending water generated by the electric flocculation into an iron carbon microelectrolysis tower for oxidation treatment; adding NaOH and Na2CO3 into the water generated by iron carbon microelectrolysis, and causing calcium and magnesium in salt-containing wastewater to precipitate; sending the obtained wastewater into a ceramic ultrafiltration membrane to be filtered, and sending a concentrated solution of a nanofiltration membrane into a first evaporator for evaporation and crystallization, and obtaining recycled Na2SO4; sending water generated by the nanofiltration membrane into a reverse osmosis membrane for filtration, sending a concentrated solution of the reverse osmosis membrane for evaporation and crystallization, and obtaining recycled NaCl.

The invention discloses a butterfly high-efficiency self-adaptive plastic-fiber mixed filter material filter. The filter consists of filter material monomers, wherein each filter material monomer is formed by connecting a weight-balancing core body and paired corrosion-resistant balancing filtering wing bodies in a matching way; the surface of the weight-balancing core body is made of plastic; the weight-balancing core body is ellipsoidal; the threshold of the average density p0 of the weight-balancing core body is between 1.30 and 1.50 g/cm<3>; the two ends of a long axis of the ellipsoidal weight-balancing core body are provided with balancing wing bodies respectively; each balancing wing body is made from fiber bundles consisting of artificial fiber yarns; and the inner ends of the artificial fiber yarns constituting each fiber bundle are fixedly connected to each end of the long axis of the weight-balancing core body and the other ends of the artificial fiber yarns are in a diffused state so as to form a whisker form. The filter has the technical advantages of high porosity, high filtering speed, high filtering accuracy, low resistance, high filth holding capacity, small backwashing water using amount, high periodic water yield, low operating cost, small floor area and high anti-load impact capacity.

The invention discloses a preparation method of a nanocomposite Al2O3 ceramic filter element with high strength. The preparation method is characterized by comprising the following steps of: firstly, preparing an Al2O3 porous matrix with macroscopic straight pores; and secondly, preparing a porous nannocomposite coating on the walls of the macroscopic straight pores of the Al2O3 porous matrix, wherein the second step comprises the following concrete steps of: (1) dissolving aluminum isopropoxide into distilled water with the temperature of 70-90 DEG C, stirring the solution, and adding nitric acid to control the pH value, wherein the aluminum isopropoxide is hydrolyzed to form a sol; (2) carrying out ultrasonic treatment at the temperature of 40 DEG C under one atmospheric pressure, and ageing the sol; (3) completely immersing the sintered Al2O3 porous matrix with the macroscopic straight pores into the aged sol, impregnating, lifting, and then carrying out freeze drying so that the sol becomes a gel; (4) carrying out thermal treatment on the gel at the temperature of 500-600 DEG C, and then, cooling along with a furnace; and (5) finally, sintering the gel at the temperature of 900-1100 DEG C to obtain the nanocomposite Al2O3 ceramic filter element.

A method of cross-flow filtration using a membrane filter has a feeding a fluid to be filtered across a membrane surface of a porous alumina membrane filter serving as the membrane filter so that the fluid flows parallel to the membrane surface to separate material to be filtered with the porous alumina membrane filter. The porous alumina membrane filter is made of an aluminum anodized film and includes micropores having a degree of ordering as defined by formula (1):

Degree of ordering (%)=B/A×100   (1)

of at least 50%, a porosity as defined by formula (2):

Porosity (%)=C/D×100   (2)

of at least 40%, and a percentage of a pore size standard deviation to an average pore size of up to 10%.

The invention relates to the technical field of image and video processing and particularly relates to a detection method for vulgar adult content of an Internet video image. The detection method comprises the following steps: reading color components R, G and B of each pixel in the Internet video image; carrying out white balance processing on the color components R, G and B of each pixel by utilizing data of changes of white blocks due to temperatures in the Internet video image, and adjusting the Internet video image into a standard-color colorful image; learning a background sample in the colorful image through a multi-level and multi-characteristic image deep learning algorithm so as to obtain a foreground image in the colorful image; and comparing an anchor image in the foreground image through an offline-acquired anchor skin nakedness receiving operation curve ROC, and determining whether the content is the vulgar adult content or not. The detection method provided by the invention has a relatively rapid detection and filtering speed, and has relatively good filtering precision and relatively low system expenditures; and the working amount of manual judgment can be extremely reduced so that the detection of the vulgar adult content of the Internet video image is efficient and intelligent.

The invention relates to the field of porous ceramic materials, and specifically relates to a dual-gradient pore-structure sialon and silicon carbide combined membrane tube and a preparation method thereof. The membrane tube material is composed of sialon and silicon carbide. The membrane tube has a dual-gradient filtering structure composed of a support body layer and a surface membrane layer. The support body layer is composed of a combination of sialon produced through a reaction and coarse silicon carbide grains, and has an average pore size of 10-50mum. The surface membrane layer is composed of a combination of sialon produced through a reaction and fine-particle silicon carbide grains, and has an average pore size of 0.1-5mum. An overall porosity of the membrane tube is within a range of 40-50%. The preparation method of the membrane tube sequentially comprises the steps of material preparation, support forming, membrane layer preparation and firing. Isostatic pressing is adopted in the forming step, wherein a forming pressure is controlled at 100-150MPa. The firing temperature is controlled at 1650-1850 DEG C, and a temperature maintaining time is 3-5h. The method is easy to realize. With the method, product performance can be ensured. The membrane tube provided by the invention has the advantages of high application temperature, high acid corrosion resistance and high alkali corrosion resistance. The membrane tube can be used in filtration purification of various fluids with high temperature or low temperature, such as high-temperature high-press gas filtration dedusting, water purification and the like.

An image forming apparatus in which ink depletion detection accuracy will not be deteriorated even if an air bubble is created in an ink supplying path. The image forming apparatus is provided with (a) an ink storage section for storing ink therein, (b) an ink supplying path for supplying, to a print head, the ink stored in the ink storage section, and (c) an electrode for detecting whether the ink is present or absent in the ink supplying path, an amount of the ink supplied into the ink supplying path being 1.0 cc or less per minute.

The invention discloses a polyamide filter element obtained through sweat soldering and a manufacturing method thereof. The polyamide filter element comprises an end cover, a lower end cover and a polyamide filter material. The polyamide filter material is of a hollow cylinder structure formed by processing polyamide materials through a melt-blowing technology, and bonding and twining blown-out superfine cellosilk. The filter material is of a loose structure and is provided with filter holes of different hole diameters. The hole diameter of the filter holes is gradually decreased from the outer layer to the inner layer of the cylinder structure. The upper end cover and the lower end cover are welded to the two ends of the filter material through a hot-melt technology. The at least one of the upper end cover and the lower end cover is provided with an oil outlet hole. The filter element has the good filter precision, pollutant carrying capacity and flow resistance parameters on the premise of ensuring that the material has the oil resistance and alcohol corrosion resistance, non-glue connection is achieved by adopting the sweat soldering scheme, and the filter requirements of oil products, chemical waste liquid and chemical waste gas are met.