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Preparation method of disc type full silicon carbide filtering membrane

A technology of full silicon carbide and filter membrane, applied in ceramic products, applications, household appliances, etc., to achieve the effect of large separation flux, strong hydrophilicity and oil repellency, and long service life

Pending Publication Date: 2018-01-23
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the industrialized ceramic membrane products are mainly single-channel ceramic membranes, multi-channel ceramic membranes, ceramic flat-plate membranes, etc., and ceramic membranes suitable for dynamic cross-flow filtration have not yet been reported.

Method used

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  • Preparation method of disc type full silicon carbide filtering membrane
  • Preparation method of disc type full silicon carbide filtering membrane
  • Preparation method of disc type full silicon carbide filtering membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1) Preparation of disc-type full silicon carbide filter membrane support

[0039] Weigh 100 parts of silicon carbide coarse powder I with an average particle size of 40 μm, 7 parts of silicon carbide fine powder II with an average particle size of 3 μm and a purity greater than 98%, and 4 parts of sodium carboxymethylcellulose with a molecular weight of 13,000 and a purity greater than 98%. , 12 parts of carbon black with an average particle size of 0.1-10 μm, stir and dissolve sodium carboxymethyl cellulose in warm water at 40°C, then add coarse silicon carbide powder Ⅰ, fine silicon carbide powder Ⅱ and carbon black in sequence, and use high-speed The mixer is mixed evenly; among them, the SEM image of silicon carbide fine powder II is as follows figure 2 As shown, the average particle size of the particles is about 3 μm, and the particle size is relatively consistent;

[0040] The uniformly mixed mud is dried and sieved, then put into the forming mold, and dry-pres...

Embodiment 2

[0048] 1) Preparation of disc-type full silicon carbide filter membrane support

[0049] Weigh 100 parts of silicon carbide coarse powder I with an average particle size of 45 μm, 6 parts of silicon carbide fine powder II with an average particle size of 2 μm and a purity greater than 98%, and 3 parts of sodium carboxymethylcellulose with a molecular weight of 15,000 and a purity greater than 98% , 14 parts of carbon black with an average particle size of 0.1-10 μm, stir and dissolve sodium carboxymethyl cellulose in warm water at 40°C, then add coarse silicon carbide powder Ⅰ, fine silicon carbide powder Ⅱ and carbon black in sequence, and mix with high speed The feeder mixes evenly;

[0050] The evenly mixed mud material is dried and sieved, then loaded into the forming mold, and then dry-pressed on a large-tonnage press to obtain a biscuit. The pressure of the dry-press forming is bidirectional pressure, and the pressure is 8MPa;

[0051] Use silicon carbide fine powder II...

Embodiment 3

[0058] 1) Preparation of disc-type full silicon carbide filter membrane support

[0059] Weigh 100 parts of silicon carbide coarse powder I with an average particle size of 30 μm, 9 parts of silicon carbide fine powder II with an average particle size of 1 μm and a purity greater than 98%, and 4 parts of sodium carboxymethylcellulose with a molecular weight of 12,000 and a purity greater than 98%. , 11 parts of carbon black with an average particle size of 0.1-10 μm, stir and dissolve sodium carboxymethyl cellulose in warm water at 40°C, then add coarse silicon carbide powder Ⅰ, fine silicon carbide powder Ⅱ and carbon black in sequence, and mix with high speed The feeder mixes evenly;

[0060] The uniformly mixed mud is dried and sieved, then put into the forming mold, and dry-pressed on a large-tonnage press to obtain a green body. The pressure of the dry-press forming is bidirectional pressure, and the pressure is 12MPa;

[0061] Use silicon carbide fine powder II, polyvin...

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Abstract

The invention relates to a preparation method of a dynamic cross flow filtration disc type full silicon carbide filtering membrane, and belongs to the technical field of preparation of advanced ceramics. The preparation method comprises the following steps: weighing a coarse silicon carbide powder I, a fine silicon carbide powder II, a plasticizer and a pore forming material, stirring and dissolving the plasticizer into warm water, sequentially adding the coarse silicon carbide powder I, the fine silicon carbide powder II and the pore forming material, and mixing evenly; conducting compressionmoulding after drying and screening to obtain a biscuit; using the fine silicon carbide powder II and a binder to prepare a concentrated slurry, spraying the concentrated slurry on the outer edge ofthe biscuit, and adhering two biscuits together; sintering to obtain a support body for the disc type full silicon carbide filtering membrane; weighing a fine silicon carbide powder III, a dispersingagent and the binder, adding deionized water, and grinding to obtain a membrane coating solution; spraying the membrane coating solution on the outer surface of the support body, and drying to obtaina semi-finished product of the filtering membrane; and sintering the semi-finished product of the filtering membrane to obtain a finished product of the disc type full silicon carbide filtering membrane. The prepared silicon carbide ceramic membrane has the characteristics of high filtering precision and large separating flux.

Description

technical field [0001] The invention relates to a disc-type full silicon carbide filter membrane, in particular to a preparation method of a disc-type full silicon carbide filter membrane for dynamic cross-flow filtration, and belongs to the technical field of advanced ceramic preparation. Background technique [0002] Ceramic membrane is an important part of high-performance membrane materials. It belongs to the strategic emerging industry of national key development. Compared with filter materials such as organic membranes, it has high temperature resistance, chemical corrosion resistance, large permeation flux, narrow pore size distribution, and strong cleanability. Therefore, it has a good application prospect in many filtration and separation fields such as chemical industry, food, machinery and pharmaceuticals. Generally, the ceramic membrane is formed by mixing inorganic raw materials and appropriate amount of additives, and then calcined at high temperature. It conta...

Claims

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Application Information

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IPC IPC(8): C04B38/06C04B35/565C04B35/622
Inventor 李双魏春城刘爱菊孟子霖张茜
Owner SHANDONG UNIV OF TECH
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