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Molecular sieve film synthesis residual liquid-based porous ceramic supporting body preparation method

A technology of porous ceramics and molecular sieve membranes, applied in the field of porous ceramic materials, can solve the problems of high energy consumption, increased ceramic material preparation costs, and high prices, and achieve the effects of protecting the environment, saving preparation costs, and high strength

Active Publication Date: 2017-08-22
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, zirconium disilicide, lithium carbonate, Y 2 o 3 The price of the material itself is high, which increases the preparation cost of ceramic materials, and the sintering temperature above 1400 ℃ will still bring high energy consumption. It has great advantages in the large-scale preparation of

Method used

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  • Molecular sieve film synthesis residual liquid-based porous ceramic supporting body preparation method
  • Molecular sieve film synthesis residual liquid-based porous ceramic supporting body preparation method
  • Molecular sieve film synthesis residual liquid-based porous ceramic supporting body preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Calculated by mass ratio, 4% NaA molecular sieve membrane synthesis residue, 20% activated carbon powder with a particle size of 1 μm, and 76% alumina powder with a particle size of 20 μm were evenly mixed. The mixed slurry is prepared by a dry pressing method to prepare a flat ceramic support body body. The pressed ceramic support body was dried in an oven at 60 °C for 60 min, and then placed in a high-temperature electric furnace to raise the temperature to 100 °C at 1 °C / min, keep it warm for 1 h, and then raise the temperature to 100 °C at 2 °C / min. 500 °C and keep it for 2 h, then raise the temperature to 900 °C at 2 °C / min, change the sintering atmosphere to nitrogen, then raise the temperature to 1100 °C at 1 °C / min, keep it for 4 h, and then cool down naturally under the air atmosphere.

[0030] The test results are: the nitrogen permeability coefficient of the prepared ceramic support is 330 m 3 / (m 2 h kPa), the flexural strength is 15.3 MPa, and the average...

Embodiment 2

[0032] Calculated by mass ratio, 8% NaA molecular sieve membrane synthesis residue, 10% activated carbon powder with a particle size of 20 μm, and 82% silicon carbide powder with a particle size of 10 μm were evenly mixed. The mixed slurry is prepared by a dry pressing method to prepare a flat ceramic support body body. The pressed ceramic support body was dried in an oven at 60 °C for 60 min, and then placed in a high-temperature electric furnace to raise the temperature to 100 °C at 1 °C / min, keep it warm for 1 h, and then raise the temperature to 100 °C at 2 °C / min. 500 °C and keep it for 1 h, then raise the temperature to 900 °C at 2 °C / min, change the sintering atmosphere to argon, then raise the temperature to 1200 °C at 1 °C / min, keep it for 6 h, and then cool down naturally in the air atmosphere.

[0033] The test results are: the nitrogen permeability coefficient of the prepared ceramic support is 120 m 3 / (m 2 h kPa), the flexural strength is 39.5 MPa, and the aver...

Embodiment 3

[0035] Calculated by mass ratio, 10% NaA molecular sieve membrane synthesis residue and 90% silicon carbide powder with a particle size of 100 μm were uniformly mixed. The mixed powder is prepared by a dry pressing method to prepare a flat ceramic support body body. The pressed ceramic support body was dried in an oven at 90 °C for 90 min, and then placed in a high-temperature electric furnace to raise the temperature to 100 °C at 1 °C / min, keep it for 1 h, and then raise the temperature to 100 °C at 3 °C / min. 500 °C and keep it for 0.5 h, then raise the temperature to 900 °C at 2 °C / min, change the sintering atmosphere to nitrogen, then raise the temperature to 1200 °C at 1 °C / min, keep it for 5 h, and then cool down naturally in the air atmosphere.

[0036] The test results are: the nitrogen permeability coefficient of the prepared ceramic support is 450 m 3 / (m 2 h kPa), the flexural strength is 45.6 MPa, and the average pore diameter is 15.3 μm.

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Abstract

The invention relates to a porous ceramic supporting body preparation method taking molecular sieve film synthesis residual liquid as a sintering aid. The preparation method comprises the following steps: adopting ceramic powder as aggregate grains, NaA molecular sieve film synthesis residual liquid as the sintering aid and activated carbon powder as a pore former, fully and uniformly mixing the components; and carrying out an extrusion formation method on a mixture to obtain a green body, drying the green body, and carrying out high-temperature sintering on the dried green body according to a procedure to prepare the porous ceramic supporting body. The ceramic material prepared by the porous ceramic supporting body preparation method has the advantages of high mechanical strength, good chemical stability, high permeability and the like and can be used for the environmental protection field of waste water treatment, atmospheric controlling and the like. As for the porous ceramic supporting body preparation method, by adopting the molecular sieve film synthesis residual liquid as a preparation raw material, waste resource utilization can be realized, an in-situ reaction sintering temperature of the ceramic material can also be lowered, the energy consumption and resources are saved, and the economic benefit and the environmental benefit are remarkable.

Description

technical field [0001] The invention belongs to the technical field of porous ceramic materials, and in particular relates to a method for preparing a porous ceramic support body based on molecular sieve membrane synthesis raffinate. Background technique [0002] Porous ceramic membrane has excellent mechanical properties, corrosion resistance and permeability, and has unique advantages in the field of gas dust removal or water treatment. The ceramic support body is the main part of the preparation of the ceramic membrane. It usually requires high-temperature reaction between the ceramic slurries to form the neck connection. The sintering temperature is generally higher than 1500 ℃. For example, the sintering temperature of pure porous SiC ceramics is generally higher than 1800 ℃. The sintering temperature of aluminum porous ceramics is 1650 ℃, and high temperature sintering is the main reason for the high cost of ceramic support preparation. Therefore, how to reduce the si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/565C04B35/64C04B38/06B01D69/10
CPCB01D69/10C04B35/10C04B35/565C04B35/64C04B38/068C04B2235/422C04B2235/96C04B2235/5436C04B2235/6562C04B2235/656C04B2235/658C04B38/0054C04B38/0074
Inventor 邢卫红杨怡仲兆祥韩峰徐鹏
Owner NANJING UNIV OF TECH
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