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Ceramic membrane and production method thereof

The technology of a ceramic membrane and a pore-forming agent is applied in the field of materials, which can solve the problems of difficult to meet the requirements of environmental conditions and processing effects, and achieve the effects of good application prospects, saving manufacturing costs, and simple process steps.

Inactive Publication Date: 2018-09-04
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the mechanical strength of ceramic membranes made of traditional metal oxides is greater than 50MPa, while the mechanical strength of ceramic membranes prepared from solid waste or minerals is usually lower than 30MPa, which is difficult to meet the current environmental conditions in the separation and filtration process. and processing effects

Method used

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  • Ceramic membrane and production method thereof
  • Ceramic membrane and production method thereof
  • Ceramic membrane and production method thereof

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preparation example Construction

[0038] The present invention also provides the preparation method of above-mentioned ceramic film, comprises the following steps:

[0039] S1 Mix fly ash, river channel bottom mud and pore-forming agent in a weight ratio of 50-80% of fly ash; 20-40% of river channel bottom mud; 5-10% of pore-forming agent.

[0040] In this step, the fly ash is solid waste discharged from coal-fired power plants, and the particle size range is 0.5-3000 μm; the river channel sediment is selected from river dredging sludge with a water content lower than 20% after dehydration, and the particle size range is 0.5-3000 μm. 0.5-3000μm.

[0041] The CaCO selected by the pore-forming agent 3 , starch, polymer microspheres or nylon, preferably CaCO 3 . The above-mentioned pore-forming agent has good dispersion in the ceramic membrane system, which can make the prepared ceramic membrane obtain smaller and uniform pores, have better separation and filtration performance, and have lower cost than other ...

Embodiment 1

[0050] S1 combined fly ash, river sediment and CaCO 3 Mix evenly according to the mass ratio of 5:2:0.5;

[0051] S2 Put 75g of the mixture in a mortar, then gradually add a total of 100ml of ethanol, grind for about 30min, then put it into a tablet press, and make multiple pieces with a diameter of about 8cm under the condition of a molding pressure of 38MPa. Flakes with a thickness of about 1 cm;

[0052] S3 Place the prepared flakes in a muffle furnace, raise the temperature in the furnace from room temperature to about 1200°C at a heating rate of 5°C / min, and calcine at a high temperature for 3 hours to obtain a pore size between 0.01 μm and 10 μm ceramic membrane with uniform pores (such as figure 1 shown).

[0053] see figure 1 and figure 2 At the same time, according to the comparison of Table 2 and Table 3, it can be seen that fly ash is selected as the main raw material in Example 1, combined with river bottom mud and pore-forming agent CaCO 3 Compared with the...

Embodiment 2

[0055] S1 mixes fly ash, river bottom mud and starch in a mass ratio of 5:2:0.5;

[0056] S2 Put 75g of the mixture in a mortar, then gradually add 100ml of ethanol in total, grind for 30 minutes, put it into a tablet press, and make multiple tablets with a diameter of about 8 cm and a thickness of about 8 cm under the condition of a molding pressure of 38 MPa. It is a thin slice of about 1 cm;

[0057] S3 Place the prepared flakes in a muffle furnace, raise the temperature in the furnace from room temperature to about 1200°C at a heating rate of 5°C / min, and calcine at a high temperature for 3 hours to obtain a pore size between 0.01 μm and 10 μm ceramic membrane.

[0058] From the comparison of Table 2 and Table 3, it can be seen that fly ash was selected as the main raw material in Example 2, and combined with river sediment and pore-forming agent starch, the ceramic membrane prepared by it was improved in terms of density, flexural strength, and oil removal rate. The com...

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Abstract

The invention provides a ceramic membrane. The ceramic membrane comprises 50-80 wt% of fly ash, 15-40 wt% of river sediment and 5-10 wt% of a pore forming agent. A production method of the ceramic membrane comprises the following steps: mixing the fly ash, the river sediment and the pore forming agent according to above weight ratio; and uniformly grinding the obtained mixture, pressing the groundmixture to form a slice by a tabletting machine, and sintering the slice in a muffle furnace at a high temperature for a period of time to form the ceramic membrane having a pore diameter of 0.01-10[mu]m. The production can be completed at one time, and the waste fly ash is selected as a main raw material, so the manufacturing cost of the ceramic membrane is greatly saved; and the river sedimentin the components is also a cheap and easily-available waste, and also can be used as a binder to facilitate the mutual bonding of the fly ash and the pore forming agent in order to improve the flexibility of the ceramic membrane, the river sediment forms the pore structure needed by the ceramic membrane after being sintered, so the produced ceramic membrane has a comparable mechanical strength with a metal oxide ceramic membrane, has an oil removal rate of above 99%, and has good separation and filtration effects.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a ceramic membrane used for separation and filtration treatment and a preparation method thereof. Background technique [0002] At present, the industrialized ceramic membrane products are mainly SiO 2 , Al 2 o 3 ,TiO 2 and ZrO 2 The ceramic membrane is based on different specifications of SiO 2 , Al 2 o 3 ,TiO 2 and ZrO 2 And other inorganic ceramic materials are used as supports, which are coated on the surface and fired at high temperature. [0003] Commercialized ceramic membranes in the prior art usually have a three-layer structure, which are a separation layer, a transition layer and a support layer. The separation layer acts as a sieve, and the existence of the transition layer is to prevent the particles of the separation layer from being washed into the support layer by water. , while the support layer provides mechanical strength to the separati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D67/00
CPCB01D67/0039B01D71/02
Inventor 唐圆圆王子铱梁琨
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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