Preparation method of large-flux ceramic membrane

A ceramic membrane, high-flux technology, used in ceramic products, chemical instruments and methods, membrane technology, etc., can solve the problems of weak acid and alkali resistance, low strength, membrane peeling, etc., and achieve acid and alkali corrosion resistance. The effect of increasing, bonding tightly and firmly, and improving the anti-pollution ability

Inactive Publication Date: 2020-07-28
山东泰禾环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] When preparing ceramic membrane supports, most manufacturers use alumina powder. However, alumina is an amphoteric oxide with weak acid and alkali resistance, and the bending strength after sintering is not high; Aluminum powder, some use zirconia or titanium oxide powder, if aluminum oxide powder is used, there are problems such as weak acid and alkali resistance, low strength after sintering, and weak hydrophilicity. Titanium powder, because the expansion and contraction coefficients of these materials are inconsistent during sintering, there will be cracking when the film layer and the support body are sintered and fused. The film layer is prone to peeling off during use
[0003] In the design of ceramic membrane pores, most manufacturers use circular flow channels. The disadvantage of circular flow channels is that the cross-sectional distribution area is limited, and the filtration area cannot be enlarged. If the filtration area is increased by increasing the pore size, the gap between the pore sizes will inevitably be reduced. The wall thickness of the circular flow channel is uneven, and it is easy to crack during sintering, which limits the filtration flux of a single ceramic membrane, thereby increasing the investment and operating costs of ceramic membrane equipment, and restricting the Application and Promotion of Ceramic Membrane

Method used

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  • Preparation method of large-flux ceramic membrane
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  • Preparation method of large-flux ceramic membrane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The preparation method of the described large-flux ceramic membrane consists of the following steps:

[0043] 1) Support body preparation:

[0044] Al with a median particle size of 30-40 μm 2 o 3 Powder, titanium oxide powder, zirconia powder and dry powder auxiliary materials are composed of dry powder materials according to the ratio of 88%: 1%: 2%: 9%. Among them, the dry powder auxiliary materials are 0.5-5μm alumina, talc, rare earth materials, cellulose , starch (mass ratio is 3:1:1:3:2), put the dry powder material into the mixer and mix evenly, then move to the kneader, add water, PVA and oil of 20% of the above dry powder weight The material is kneaded, and after the mud is practiced by the mud refining machine, it is stale for 24 hours, and the stale mud is extruded by an extruder, and the mold adopts a structural form combining regular hexagons and long hexagons (see figure 2 ), the formed embryo body is dried and shaped, and the dried embryo body is sin...

Embodiment 2

[0051] The preparation method of the described large-flux ceramic membrane consists of the following steps:

[0052] 1) Support body preparation:

[0053] The median particle size is 25-35μm Al 2 o 3 Powder, titanium oxide powder, zirconia powder and dry powder auxiliary materials are composed of dry powder materials according to the ratio of 80%: 3%; 6%: 11%. The dry powder auxiliary materials are 0.5-5μm alumina, potassium feldspar, rare earth materials, fibers Vegetarian, starch (mass ratio is 5:1:1:3:2), the dry powder material of composition is added in the mixer and mixed evenly, then moves to the kneader, adds the water and PVA of above dry powder weight 18% , oily materials kneading, and then stale for 36 hours after passing through the mud refining machine, and the stale mud is extruded by an extruder, and the mold adopts a structural form combining regular hexagons and long hexagons (see image 3 ), the formed embryo body is dried and shaped, and the dried embryo ...

Embodiment 3

[0060] The preparation method of the described large-flux ceramic membrane consists of the following steps:

[0061] 1) Support body preparation: Al with a median particle size of 15-30 μm 2 o 3 Powder, titanium oxide powder, zirconia powder and dry powder auxiliary materials are composed of dry powder materials according to the ratio of 63%: 9%; 16%: 12%. The dry powder auxiliary materials are 0.5-5μm alumina, talc, rare earth materials, cellulose, Starch (mass ratio is 6:1:1:3:2), the dry powder material of composition is fed into the mixer and mixed evenly, then moved to the kneader, add water and PVA, oil of 18% of the above dry powder weight kneading of similar materials, and then stale for 48 hours after passing through the mud refining machine, and the stale mud is extruded by an extruder, and the mold adopts a structural form combining a honeycomb structure and a special-shaped hexagonal structure (see Figure 4 ), the formed embryo body is dried and shaped, and the ...

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Abstract

The invention relates to a preparation method of a ceramic membrane, in particular to a preparation method of a large-flux ceramic membrane. The preparation method comprises the following steps: (1) preparing a support body, namely mixing aluminum oxide powder, titanium oxide powder, zirconium oxide powder and auxiliary materials according to a certain ratio, mixing, kneading, forming and drying the mixture, and finally sintering the mixture at high temperature to form the support body, wherein the flow channels in the support body are arranged in a manner of combining regular hexagonal flow channels and long hexagonal flow channels; 2) preparing a transition layer, namely mixing zirconium oxide powder, titanium oxide powder, aluminum oxide powder and auxiliary materials, and stirring, coating, drying and sintering the mixture at high temperature to form the transition layer; and 3) preparation of a filter membrane layer: mixing zirconium oxide powder, aluminum oxide powder and auxiliary materials, and performing stirring, coating, drying and high-temperature sintering to obtain the filter membrane layer with the filter precision of 20-200 nanometers. The ceramic membrane preparedby the method has the characteristics of high flux, high bending strength, strong pollution resistance and acid and alkali corrosion resistance.

Description

technical field [0001] The invention relates to a preparation method of a ceramic membrane, in particular to a preparation method of a large flux ceramic membrane. Background technique [0002] When preparing ceramic membrane supports, most manufacturers use alumina powder. However, alumina is an amphoteric oxide with weak acid and alkali resistance, and the bending strength after sintering is not high; Aluminum powder, some use zirconia or titanium oxide powder. If alumina powder is used, there are problems such as weak acid and alkali resistance, low strength after sintering, and weak hydrophilicity. If zirconia or Titanium powder, because the expansion and contraction coefficients of these materials are inconsistent during sintering, there will be cracking when the film layer and the support body are sintered and fused. The film layer is prone to peeling off during use. [0003] In the design of ceramic membrane pores, most manufacturers use circular flow channels. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622C04B35/63C04B38/00C04B41/89B01D71/02B01D69/02B01D67/00
CPCB01D67/0039B01D67/0041B01D69/02B01D71/024B01D71/025C04B35/10C04B35/622C04B35/6303C04B38/0006C04B41/009C04B41/52C04B41/89C04B2235/3224C04B2235/3232C04B2235/3244C04B2235/3445C04B2235/6021C04B2235/656C04B2235/6567C04B2235/94C04B2235/95C04B2235/96C04B38/0003C04B41/5031C04B41/4535C04B41/5041C04B41/5042C04B41/4869C04B41/4803C04B41/0072
Inventor 房军贤
Owner 山东泰禾环保科技股份有限公司
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