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Silicon carbide-based porous ceramic filter membrane and preparation method thereof

A silicon carbide-based, porous ceramic technology, applied in the field of inorganic porous materials, can solve the problems of reduced acid and alkali resistance, unfavorable production and application, complicated preparation process, etc., and achieve low production energy consumption, low equipment requirements, and simple process methods Effect

Active Publication Date: 2022-02-01
CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the preparation of silicon carbide ceramics in the prior art usually requires the addition of sintering aids to reduce its sintering temperature, and the sintering aids often use oxides containing alkali metals, resulting in reduced acid and alkali resistance; in addition, the preparation of carbonized ceramics in the prior art Silicon-based porous ceramic filter membranes still have high preparation costs and complicated preparation processes, which are not conducive to actual production and application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Preparation of silicon carbide-based support: Mix silicon carbide powder, fly ash, pore-forming agent, binder, dispersant and solvent wet grinding to obtain silicon carbide-based ceramic slurry, and a certain size of polyurethane The foam is placed in the slurry and ultrasonically treated for 30 minutes to obtain a polyurethane foam composite material filled with silicon carbide-based slurry. After it is fully dried at 60°C, it is placed in a muffle furnace and sintered at 1400°C for 1 hour. That is, a silicon carbide-based support with a hierarchical pore structure is obtained. Among them, silicon carbide powder, fly ash, pore-forming agent, binder, dispersant and solvent are proportioned in parts by weight of 85 parts: 8 parts: 10 parts: 2 parts: 1 part: 25 parts; the pore-forming agent is Chitosan, binder is sodium silicate aqueous solution, dispersant is triethanolamine, solvent is H 2 O: Ethanol (volume ratio) is a mixed solution of 1:1.

[0031] (2) Preparat...

Embodiment 2

[0034] (1) Preparation of silicon carbide-based support: Mix silicon carbide powder, fly ash, pore-forming agent, binder, dispersant and solvent wet grinding to obtain silicon carbide-based ceramic slurry, and a certain size of polyurethane The foam was placed in the slurry and ultrasonically treated for 40 minutes to obtain a polyurethane foam composite material filled with silicon carbide-based slurry. After it was fully dried at 60°C, it was placed in a muffle furnace and sintered at 1400°C for 1 hour. That is, a silicon carbide-based support with a hierarchical pore structure is obtained. Among them, silicon carbide powder, fly ash, pore-forming agent, binder, dispersant and solvent are proportioned in parts by weight of 80 parts: 10 parts: 8 parts: 3 parts: 2 parts: 26 parts; the pore-forming agent is Starch, the binder is sodium silicate aqueous solution, the dispersant is triethanolamine, and the solvent is H 2 O.

[0035] (2) Preparation of silicon carbide-based transi...

Embodiment 3

[0038] (1) Preparation of silicon carbide-based support: Mix silicon carbide powder, fly ash, pore-forming agent, binder, dispersant and solvent wet grinding to obtain silicon carbide-based ceramic slurry, and a certain size of polyurethane The foam is placed in the slurry and ultrasonically treated for 30 minutes to obtain a polyurethane foam composite material filled with silicon carbide-based slurry. After it is fully dried at 60°C, it is placed in a muffle furnace and sintered at 1400°C for 1 hour. That is, a silicon carbide-based support with a hierarchical pore structure is obtained. Among them, silicon carbide powder, fly ash, pore-forming agent, binder, dispersant and solvent are proportioned in parts by weight of 85 parts: 10 parts: 10 parts: 3 parts: 3 parts: 30 parts; the pore-forming agent is Chitosan, the binder is methyl cellulose, the dispersant is triethanolamine, and the solvent is H 2 O: Ethanol (volume ratio) is a mixed solution of 1:1.

[0039] (2) Prepar...

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PUM

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Abstract

The invention provides a silicon carbide-based porous ceramic filter membrane and a preparation method thereof. The silicon carbide-based porous ceramic filter membrane is prepared from silicon carbide powder, fly ash, a pore-forming agent, a binder, a dispersant, a solvent, an additive and polyurethane foam. The pore-forming agent is one or two of starch and chitosan; the binder is composed of one or more of a silicate solution and methyl cellulose; the dispersing agent is prepared from one or more of sodium hexametaphosphate, sodium citrate, triethanolamine and amine polymethacrylate; the solvent is composed of one or more of water, ethanol or a mixture of water and ethanol; and the additive is a mixture of tungsten oxide and lanthanum oxide powder. The invention can provide the preparation method which is low in sintering temperature, low in production energy consumption, simple in process method, low in production cost, flexible to control and capable of meeting large-scale production, and the porous silicon carbide-based ceramic filter membrane material which is good in acid and alkali corrosion resistance, high in porosity of a sintered product, high in mechanical strength, large in flux and long in service life.

Description

technical field [0001] The invention relates to the technical field of inorganic porous materials, in particular to a silicon carbide-based porous ceramic filter membrane and a preparation method thereof. Background technique [0002] Porous ceramic membrane has the characteristics of high temperature resistance, corrosion resistance, high strength, good chemical stability and high fine particle collection efficiency. It is widely used as a filter material in environmental protection fields such as sewage treatment and high temperature gas dust removal. It is a very promising Gas-solid separation and liquid-solid separation materials. For example, Shandong Industrial Ceramics Research and Design Institute uses quartz, corundum, bauxite, etc. as raw materials, and uses hot casting molding technology to prepare products with a porosity of 25% to 40%, and a pore size distribution of about 10 to 200 μm, which has good acid and alkali resistance. Porous ceramic products, these p...

Claims

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Application Information

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IPC IPC(8): C04B38/06C04B35/565C04B35/622C04B35/80C04B35/64C04B35/636
CPCC04B38/0615C04B38/0645C04B35/565C04B35/62204C04B35/62218C04B35/6365C04B35/64C04B35/80C04B2235/3227C04B2235/3258C04B2235/96Y02W10/10
Inventor 李昊彭锐超刘纪根任斐鹏孙宝洋程冬兵
Owner CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION