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Metallic filtering film with antisymmetric structure and method of preparing the same

A technology of metal filter membrane and asymmetric structure, which is applied in the field of metal filter membrane with asymmetric structure and its preparation, can solve the problems of affecting the service life of the line and the effect is not very good, so as to improve the filtration efficiency and adhesion , the effect of fluid flux increase

Active Publication Date: 2010-06-02
苏州海普过滤分离科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Often only by back-blowing and back-flushing, the effect is not very good, which directly affects its online service life and overall service life

Method used

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  • Metallic filtering film with antisymmetric structure and method of preparing the same
  • Metallic filtering film with antisymmetric structure and method of preparing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: A disk-shaped 316L stainless steel support was used to prepare an asymmetric structural metal film. The main chemical components were: Cr: 16.5%, Ni: 12.4%, Mo: 2.1%, Mn: 0.6%, Si: 1.2%, C: 0.03%, the balance is Fe, the diameter of the disc is 10cm, the thickness is 3mm, the average pore diameter of the support body is 10μm, the porosity is 45%, and the suspension slurry contains 0.5% Carbopol (Carbopol), liquid The phase was pure water, and the weight ratio of metal powder to liquid phase was 2.5:1. The metal powder is stainless steel 316L powder atomized by inert gas, with an average particle size of 3μm; after the slurry is fully stirred and mixed, it is evenly sprayed on the surface of the disc support with a modified spray gun, and then dried at room temperature for 24 hours. While coating the film, a vacuum of -0.3 atm was applied on the uncoated side of the disc; the dried workpiece was vacuum sintered at a temperature of 930° C. for 2.0 hours. The th...

Embodiment 2

[0024] Example 2: A tubular metal support was used to prepare a filter membrane with a non-paired structure. The diameter of the tube was 50 mm, the length was 200 mm, the wall thickness was 2.5 mm, and the porosity of the tubular support was 45%. The average pore diameter is 20 μm, its material is stainless steel 316L, and its chemical composition is the same as that described in Example 1. The metal powder used for the coating film is an inert gas atomized stainless steel 316L powder with an average particle size of 10 μm. The formulation of the coating slurry was the same as described in Example 1. After the slurry was thoroughly stirred and mixed, it was uniformly sprayed onto the outer surface of the tubular support with a modified spray gun, and then dried at room temperature for 24 hours. While coating the film, a vacuum of -0.3 atm was applied in the tube; the dried workpiece was vacuum sintered at a temperature of 1100° C. for 2.0 hours. The sintered filtration contr...

Embodiment 3

[0025] Example 3: This example describes the preparation method of the asymmetric structure of the two-layer film, the preparation method and process conditions of the metal support and the first layer film (transition layer) are exactly the same as those described in Example 2, In this example, a filtration control layer (second layer) with higher filtration precision is also coated on the first film (transition layer), and the metal powder used for preparing the filtration control layer is also produced by inert gas atomization. The average particle size is 1.5 μm, the suspension slurry contains 0.5% Carbopol, the liquid phase is pure water, and the weight ratio of metal powder to liquid phase is 2.5:1; Sintered for 2 hours. The thickness of the second membrane (the filtration control layer) is about 0.1 mm, and the average pore size is about 0.2 μm.

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Abstract

The invention relates to a metal filtering membrane in dissymmetrical structure. One or more metal films are coated on a metal support body with the aperture reduced layer by layer, thus forming a multi-metal-film filter material in inverted trapezium structure. The method for preparing the metal filtering membrane has the following steps that: firstly, the metal support body is washed and the surface of the metal supporting body is treated before a suspended sizing agent used for film coating is prepared; subsequently, the prepared sizing agent is uniformly coated on the surface of the metalsupporting body; finally, the metal supporting body is sintered and moulded at high temperature. The filter efficiency, the service life and the filtration precision of the metal filtering membrane are significantly improved by using the mechanism of surface filtration. By adopting the invention, the dissymmetrical metal filtering membrane in multilayer structure with the filtration precision as high as 0.2 Mu m and significantly prolonged service cycle is prepared. Compared the dissymmetrical metal filtering membrane with traditional metal membranes, the fluid flux of the dissymmetrical metalfiltering membrane can be increased by twice to four times.

Description

【Technical field】 [0001] The invention belongs to the field of new material industry, and relates to a metal filter membrane with an asymmetric structure and a preparation method thereof, which utilizes a surface filter mechanism to make the filter accuracy reach submicron level, and has the advantages of long service cycle and high flux. 【Background technique】 [0002] Energy and environmental protection are two major themes of the 21st century. In today's world, energy shortage, water resource scarcity and environmental pollution are becoming more and more serious. Membrane separation technology, with its high efficiency, energy saving and pollution-free features, has developed rapidly in a short period of time and has been widely and effectively used in petroleum Chemical industry, biochemical pharmaceutical, medical and health care, metallurgy, electronics, energy, light industry, textile, food, environmental protection, aerospace, shipping and all aspects of people's li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02
Inventor 徐小平
Owner 苏州海普过滤分离科技有限公司
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