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Co-sintering preparation method for flyash-based ceramic microfiltration membrane

A technology for ceramic microfiltration and fly ash, which is applied in the production of ceramic materials, clay products, applications, etc., can solve the problems of high preparation cost of ceramic membranes, and achieve the effect of reducing the cost of raw materials and energy consumption of sintering

Active Publication Date: 2018-11-30
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With its excellent material properties, ceramic membranes show incomparable advantages of organic membranes in many harsh application systems, but the high preparation cost of ceramic membranes is a problem that cannot be ignored, and has become the main factor limiting the application of ceramic membranes. How to reduce the preparation cost of ceramic membranes has become one of the core issues in the current ceramic field.

Method used

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  • Co-sintering preparation method for flyash-based ceramic microfiltration membrane
  • Co-sintering preparation method for flyash-based ceramic microfiltration membrane
  • Co-sintering preparation method for flyash-based ceramic microfiltration membrane

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Experimental program
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Effect test

Embodiment 1

[0023] First, 100-mesh sieves were used to classify the fly ash, and the classified fly ash and alumina whiskers (the mass ratio of rigid oxide whiskers to fly ash was 1:6) were mixed for 1 min, and then mixed Add 2% glycerin to the final powder to the total mass of fly ash and alumina whiskers for mixing, mud refining, and dry pressing to prepare a green sheet fly ash / whisker carrier, and control the pressure At 5Mpa, the residence time is 60s. Secondly, alumina powder with an average particle size of 300nm, a certain amount of sulfuric acid, and a certain amount of polyvinyl alcohol are prepared into a stable film-forming solution under the action of an ultrasonic instrument. The mass fraction of alumina in the prepared film-forming solution 5wt.%, the mass fraction of the thickener is controlled at 20wt.%, and the pH value of the final prepared film-forming solution is 2. The film-forming solution was sprayed on the green sheet-type fly ash / whisker carrier by spray gun spr...

Embodiment 2

[0025] First, a 1000-mesh sieve was used to classify the fly ash, and the classified fly ash and silicon carbide whiskers (the mass ratio of the rigid oxide whiskers to the fly ash was 1:10) were mixed for 60 minutes by conventional stirring. Add polyvinyl alcohol accounting for 10% of the total mass of fly ash and alumina whiskers to the mixed powder for mixing, mud refining, and dry pressing to prepare green flake fly ash / whiskers For the carrier, the pressure is controlled at 30Mpa, and the residence time is 5s. Secondly, alumina powder with an average particle size of 1000nm, a certain amount of hydrochloric acid, and a certain amount of polyethylene glycol are prepared into a stable film-making solution under the action of an ultrasonic instrument. The quality of alumina in the prepared film-making solution The fraction is 35wt.%, the mass fraction of the thickener is controlled at 5wt.%, and the pH value of the final prepared membrane solution is 4. The film-forming sol...

Embodiment 3

[0027] First, 300-mesh sieves were used to classify the fly ash, and the classified fly ash and mullite whiskers (the mass ratio of rigid oxide whiskers to fly ash was 1:8) were mixed for 5 minutes by conventional stirring. , adding polyvinyl alcohol accounting for 4% of the total mass of fly ash and alumina whiskers to the mixed powder for mixing, refining mud, and preparing green flake fly ash / crystal whiskers through a dry pressing process. The carrier must be used, the pressure is controlled at 20Mpa, and the residence time is 20s. Secondly, alumina powder with an average particle size of 300nm, a certain amount of nitric acid, and a certain amount of methylcellulose are formulated into a stable film-forming solution under the action of an ultrasonic instrument. The quality of alumina in the prepared film-forming solution The fraction is 20wt.%, the mass fraction of the thickener is controlled at 14wt.%, and the pH value of the final prepared membrane solution is 2. The f...

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Abstract

The invention relates to a co-sintering preparation method for a flyash-based ceramic microfiltration membrane. The fly-ash-based ceramic microfiltration membrane is prepared by doping flyash whiskerswith rigid oxide whiskers, then coating a green flyash-based carrier with an alumina ceramic microfiltration membrane and then carrying out one-step sintering by using a co-sintering technology. Thedoping of the rigid whiskers alleviates the excessive shrinkage of the flyash-based carrier, and the thermodynamic properties of the top-layer aluminum oxide membrane are matched, so the complete defect-free flyash-based ceramic membrane can be prepared in one step by using the co-sintering technology. The prepared flyash-based ceramic microfiltration membrane is greatly reduced in raw material cost and sintering energy consumption, and has higher performance than the ceramic microfiltration membranes reported in the prior art.

Description

technical field [0001] The invention relates to a co-sintering preparation method of a low-cost fly ash-based ceramic microfiltration membrane, belonging to the field of membrane material preparation. Background technique [0002] With its excellent material properties, ceramic membranes show incomparable advantages of organic membranes in many harsh application systems, but the high preparation cost of ceramic membranes is a problem that cannot be ignored, and has become the main factor limiting the application of ceramic membranes. How to reduce the preparation cost of ceramic membranes has become one of the core issues in the current ceramic field. [0003] Co-sintering technology is to simplify the original multiple sintering process into one sintering process from the perspective of shortening the process and reducing energy consumption at the same time, which can greatly reduce the sintering energy consumption and preparation cost of materials, and shorten the preparat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/36C04B33/135C04B33/13C04B35/622
CPCC04B33/13C04B33/1352C04B33/36C04B35/62218C04B2235/6565C04B2235/6562C04B2235/6567C04B2235/5224C04B2235/5228C04B2235/5244Y02P40/60
Inventor 范益群邹栋邱鸣慧陈献富
Owner NANJING UNIV OF TECH
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