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Co-sintering preparation method of a fly ash-based ceramic microfiltration membrane

A technology for ceramic microfiltration and fly ash is applied in the field of co-sintering preparation of low-cost fly ash-based ceramic microfiltration membranes, which can solve the problems of high preparation cost of ceramic membranes, and achieve the effect of reducing raw material cost and sintering energy consumption.

Active Publication Date: 2021-06-22
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 of a fly ash-based ceramic microfiltration membrane
  • Co-sintering preparation method of a fly ash-based ceramic microfiltration membrane
  • Co-sintering preparation method of a fly ash-based ceramic microfiltration membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0023] First, use a 100-mesh sieve to classify the fly ash, and mix the classified fly ash and alumina whiskers (the mass ratio of rigid oxide whiskers and fly ash is 1:6) by stirring for 1 min. Add glycerin accounting for 2% of the total mass of fly ash and alumina whiskers to the final powder for mixing, smelting, and preparing the green sheet type fly ash / whisker carrier through the dry pressing molding process, and the pressure is controlled. At 5Mpa, the residence time is 60s. Secondly, the 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 liquid under the action of an ultrasonic instrument. The mass fraction of alumina in the prepared film-making liquid 5 wt. %, the mass fraction of the thickener is controlled at 20 wt. %, and the pH value of the final film-forming solution is 2. The film-forming liquid was sprayed on the green flake-type fly ash / whi...

Embodiment 2

[0025] First, use a 1000-mesh sieve to classify the fly ash, and mix the classified fly ash and silicon carbide whiskers (the mass ratio of rigid oxide whiskers and fly ash is 1:10) by traditional stirring for 60 minutes. Add polyvinyl alcohol, which accounts for 10% of the total mass of fly ash and alumina whiskers, to the mixed powder for mixing, smelting, and preparing green sheet-type fly ash / whisker by dry pressing. Carrier, the control pressure is 30Mpa, and the residence time is 5s. Secondly, the 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-forming liquid under the action of an ultrasonic instrument, and the quality of the alumina in the prepared film-making liquid is The fraction is 35 wt.%, the mass fraction of the thickener is controlled at 5 wt.%, and the pH value of the final film-forming solution is 4. The film-forming liquid was sprayed o...

Embodiment 3

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

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Abstract

The invention relates to a co-sintering preparation method of a low-cost fly ash-based ceramic membrane. By doping rigid oxide whiskers in fly ash whiskers, and then coating alumina ceramic microfiltration membranes on the green fly ash-based carrier, the fly ash-based ceramic microfiltration membrane was prepared by one-step sintering by co-sintering technology. filter membrane. The doping of rigid whiskers alleviates the excessive shrinkage of the fly ash carrier, matches the thermodynamic properties of the top alumina film, and can prepare a complete and defect-free fly ash-based ceramic film in one step by co-sintering technology. The preparation of fly ash-based ceramic microfiltration membrane greatly reduces the raw material cost and sintering energy consumption of the ceramic membrane, and has higher performance than the ceramic microfiltration membrane reported in the literature.

Description

technical field [0001] The invention relates to a co-sintering preparation method of a low-cost fly ash-based ceramic microfiltration membrane, and belongs to the field of membrane material preparation. Background technique [0002] Ceramic membranes show incomparable advantages of organic membranes in many harsh application systems due to their excellent material properties, 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 simplifies the original multiple sintering process into a single 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 the material, and shorten the...

Claims

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Application Information

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