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A preparation method of fly ash-alumina double-layer composite microfiltration membrane

A double-layer composite, fly ash technology, applied in chemical instruments and methods, membrane, membrane technology and other directions, can solve the problems of wide average pore size distribution, low separation accuracy, difficult microfiltration membranes, etc. The effect of separation accuracy and good mechanical strength

Active Publication Date: 2022-02-22
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The generally prepared fly ash carrier has a wide average pore size distribution and low separation precision, making it difficult to continue coating a microfiltration membrane with higher precision on the carrier

Method used

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  • A preparation method of fly ash-alumina double-layer composite microfiltration membrane
  • A preparation method of fly ash-alumina double-layer composite microfiltration membrane
  • A preparation method of fly ash-alumina double-layer composite 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. Glycerin is added to the classified powder for mixing and mud refining, wherein the added mass of glycerin accounts for 2% of the total mass of fly ash. The outer diameter of the tubular green carrier extruded by the extrusion molding machine is 12mm, and the inner diameter is 8mm. The heat treatment process of the ceramic green body is as follows: drying at a temperature of 70°C for 12 hours, sintering temperature at 1050°C, holding time for 5 hours, and heating and cooling rates at 2°C / min. The aluminum oxide powder with an average particle size of 300nm, a certain amount of sulfuric acid, and a certain amount of polyethylene glycol are prepared into a stable film-forming solution under the action of an ultrasonic instrument. The mass fraction of alumina in the prepared membrane-forming solution is 5wt.%, the mass fraction of the thickener is controlled at 20wt.%, and the pH value of the final prepared membran...

Embodiment 2

[0025] Firstly, the fly ash is classified by using a 1000-mesh sieve. Add polyvinyl alcohol to the classified powder for mixing and mud refining, wherein the added mass of polyvinyl alcohol accounts for 10% of the total mass of fly ash. The outer diameter of the tubular green carrier extruded by the extrusion molding machine is 16 mm, and the inner diameter is 10 mm. The heat treatment process of the ceramic green body is: drying at a temperature of 120°C for 36 hours, the sintering temperature at 1200°C, the holding time at 0.5h, and the heating and cooling rate at 5°C / min. The alumina powder with an average particle size of 1000nm, a certain amount of hydrochloric 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 was 35wt.%, the mass fraction of the thickener was controlled at 5wt.%, and the pH value of the final pre...

Embodiment 3

[0027] First, 300-mesh sieves were used to classify the fly ash. Adding polyvinyl alcohol and glycerin to the classified powder for mixing and smelting, wherein the addition of glycerin and polyvinyl alcohol accounts for 4% of the fly ash mass. The outer diameter of the tubular green carrier extruded by the extrusion molding machine is 12mm, and the inner diameter is 8mm. The heat treatment process of the ceramic green body is: drying at a temperature of 110°C for 24 hours, the sintering temperature at 1100°C, the holding time at 2 hours, and the heating and cooling rate at 3°C / min. The aluminum oxide 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 solution under the action of an ultrasonic instrument. The mass fraction of alumina in the prepared membrane-forming solution is 25wt.%, the mass fraction of the thickener is controlled at 15wt.%, and the pH value of the...

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Abstract

The invention relates to a method for preparing a fly ash-alumina double-layer composite microfiltration membrane. Firstly, a high-performance fly ash carrier is prepared by adjusting the sintering temperature of the fly ash carrier and the amount of organic matter added, which is used for subsequent ceramics. The membrane provides good mechanical strength; secondly, the high-purity alumina powder, dispersant and thickener are configured into a stable membrane-making solution, coated on the fly ash carrier, and a double-layer membrane is prepared through a heat treatment process. Fly ash-alumina double-layer composite membrane provides high separation accuracy. This process not only makes reasonable use of fly ash, protects the environment, reduces the preparation cost of ceramic membranes, but also shows a good application prospect in emulsified oily wastewater.

Description

technical field [0001] The invention relates to the preparation of a fly ash-alumina double-layer composite microfiltration membrane, which belongs to the fields of membrane material preparation and water treatment. Background technique [0002] Ceramic membranes have a series of advantages such as good chemical stability, high mechanical strength, strong antimicrobial ability, high temperature resistance, and narrow pore size distribution. The application fields have been expanded to the environment, biochemistry, food, etc., and the development is extremely rapid. Its technology and industry Gradually occupy an important role in the membrane field. [0003] The biggest problem limiting the application of ceramic membranes is the cost issue. How to reduce the application cost of ceramic membranes and improve the comprehensive benefits of the application process has become the core issue in the field of ceramic membranes. The cost of the ceramic membrane mainly comes from t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D69/12B01D69/02B01D67/00C02F1/44
CPCB01D67/0039B01D69/02B01D69/12B01D71/025C02F1/44B01D2325/04B01D2325/24B01D2325/02
Inventor 范益群邹栋邱鸣慧陈献富
Owner NANJING TECH UNIV
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