Diatomite-based porous ceramic as well as preparation method and system thereof

A technology of diatomite and porous ceramics, which is applied in the field of porous ceramics, can solve the problems of low strength of porous ceramics, unfavorable industrial application, complex process, etc., and achieve the advantages of improving mixing efficiency and mixing effect, improving efficiency, and uniform pore distribution Effect

Pending Publication Date: 2019-07-23
SHENZHEN TAOTAO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this process, paraffin wax solution is used to pretreat organic foam microspheres, and oleic acid is used to treat the surface of ceramic powder and glass additives. industrial application

Method used

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  • Diatomite-based porous ceramic as well as preparation method and system thereof
  • Diatomite-based porous ceramic as well as preparation method and system thereof
  • Diatomite-based porous ceramic as well as preparation method and system thereof

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preparation example Construction

[0053] In one aspect of the present invention, the present invention proposes a preparation method of diatomite-based porous ceramics, according to the embodiments of the present invention, refer to figure 1 , the method includes:

[0054] S100: Mix diatomaceous earth, sintering aid and pore-forming agent

[0055] In this step, the diatomite, sintering aid and pore-forming agent are mixed to obtain a mixed powder. The inventors found that by mixing diatomite with sintering aids and pore-forming agents, it is beneficial to increase the contact area between diatomite, sintering aids, and pore-forming agents, thereby improving subsequent mixing efficiency and mixing effect. The sintering aid will form a liquid phase at high temperature, which can reduce the sintering temperature of porous ceramics; the pore-forming agent will volatilize at high temperature sintering, thereby leaving corresponding pores in the ceramic.

[0056] According to an embodiment of the present invention...

Embodiment 1

[0101] Diatomaceous earth, low-temperature and heavy metal-free glass powder (particle size is 1500 mesh, melting temperature is 650-750°C) and polystyrene microspheres (particle size is 20 μm) are supplied to the Mix in a ball mill to obtain a mixed powder; supply the paraffin and stearic acid to the wax mixer according to 25wt%: 5wt% for mixing, and heat until the paraffin melts to obtain a mixture containing melted paraffin; supply the mixed powder to the mixer Mix and knead with the mixture containing melted paraffin in the wax machine to obtain the mixture; hot die-cast the mixture at 70°C and 3MPa pressure to obtain the molding material; supply the molding material to the wax discharge furnace Carry out wax removal treatment, the temperature of wax removal treatment is 300 ℃, the temperature rise rate of wax removal treatment is 0.5 ℃ / min when it is below 200 ℃, and the temperature rise rate of wax removal treatment is 1 ℃ / min when it is above 200 ℃, in order to obtain D...

Embodiment 2

[0103] Diatomaceous earth, low-temperature and heavy metal-free glass powder (particle size is 2000 mesh, melting temperature is 750-850 ° C) and polymethyl methacrylate microspheres (particle size is 15 μ m) according to 55wt%: 5wt%: 10wt % is supplied to a ball mill for mixing to obtain a mixed powder; paraffin and stearic acid are supplied to a wax mixer according to 27wt%: 3wt% for mixing, and heated until the paraffin melts to obtain a mixture containing melted paraffin; the mixed powder Supply to the wax mixer and mix and knead with the mixture containing melted paraffin to obtain the mixture; hot die-cast the mixture at 70°C and 3MPa pressure to obtain the molding material; supply the molding material to The wax removal furnace performs wax removal treatment. The temperature of the wax removal treatment is 300°C. The temperature rise rate of the wax removal treatment is 0.5°C / min when the temperature is below 200°C, and the temperature rise rate of the wax removal treatm...

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Abstract

The invention discloses diatomite-based porous ceramic as well as a preparation method and system thereof. The method comprises steps as follows: (1) diatomite, a sintering aid and a pore former are mixed to obtain mixed powder; (2) the mixed powder, paraffin and a modifier are mixed to obtain a mixed material; (3) the mixed material is subjected to hot pressing casting to obtain a formed material; (4) dewaxing treatment is performed on the formed material to obtain a de-waxed material; (5) the de-waxed material is sintered to obtain the diatomite-based porous ceramic. According to the method,with organic microspheres adopted as the pore former, the diatomite-based porous ceramic with uniform pore distribution, the porosity of 40%-70%, the pore size of 5-20 mu m and the compressive strength of 5-20 MPa is obtained with a hot-pressing casting process.

Description

technical field [0001] The invention belongs to the field of porous ceramics, in particular, the invention relates to diatomite-based porous ceramics and a preparation method and system thereof. Background technique [0002] Porous ceramics are widely used in energy saving, environmental protection, petroleum, chemical, Food and other fields, and have received more and more attention in recent years. [0003] At present, the main methods for preparing porous ceramics include mechanical extrusion molding, particle accumulation, adding organic pore-forming agents, adding inorganic pore-forming agents, as well as foaming, freeze-drying and gel injection molding. The main difficulty is how to achieve precise control The pore size, pore morphology and pore distribution of porous ceramics, how to increase the porosity while maintaining compatible compressive strength, and how to reduce costs. In the prior art, organic foam microspheres are used as a pore-forming agent, and porou...

Claims

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Application Information

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IPC IPC(8): C04B38/06C04B35/14C04B35/622C04B35/634C04B35/638C04B35/64
CPCC04B38/067C04B35/14C04B35/622C04B35/63496C04B35/638C04B35/64C04B2235/6562C04B2235/6567C04B2235/96C04B38/0074C04B38/0054
Inventor 余明先李毅吴沙鸥
Owner SHENZHEN TAOTAO TECH CO LTD
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