Preparation method of alkali-activated fly ash-converted carbon nanotube/leucite porous ceramic composite material
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A technology of carbon nanotubes and porous ceramics, which is applied in the field of green preparation technology of waste slag porous materials, and achieves the effects of low density, controllable pores, and simple and controllable process
Active Publication Date: 2021-12-10
NORTHEASTERN UNIV
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[0005] Aiming at the problem of low-cost green preparation of carbon nanotube / leucite porous ceramic composite material, the present invention provides a preparation method of carbon nanotube / leucite porous ceramic composite material transformed by alkali-activated fly ash. Fly ash is used as raw material to react with alkaline inorganic precursor at room temperature, and the surface functionalized carbon nanotubes are uniformly dispersed in the alkaline mixed solution. Through room temperature precursor synthesis and high-temperature calcination process, carbon nanotube / piegranate Low-cost green preparation of stone porous ceramic composites, which solves the problems of carbon nanotube dispersion and preparation of porous ceramics from fly ash
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Embodiment 1
[0027] A method for preparing a carbon nanotube / leucite porous ceramic composite material transformed by alkali-activated fly ash, the steps are as follows:
[0028] Step 1. Pretreatment of raw material fly ash and carbon nanotubes
[0029] Fly ash with a coarse particle size is ground to 1-5 μm, and the multi-walled carbon nanotubes are carboxylated with a sulfuric acid solution so that the surface has carboxyl and hydroxyl functional groups.
[0030] The raw material fly ash is low-calcium fly ash, and its composition is: 53wt% SiO 2 , 37wt% Al 2 o 3 , 3wt% CaO, 3wt% Fe 2 o 3 and 0.3 wt% MgO.
[0031] Step 2. Configure alkaline silica sol excitation solution
[0032] Potassium hydroxide was added to the silica gel solution with a mass fraction of 40% at a molar ratio of 1:1, and stirred with a 1000 rpm magnetic stirrer for 30 min to obtain an alkaline silica sol excitation solution whose main component was potassium silicate.
[0033] Step 3, mixing of carbon nanotube...
Embodiment 2
[0047] The difference from Example 1 is that the mass ratio of carbon nanotubes to the alkaline silica sol excitation solution in step 3 is 1.2:17, and the others are the same as in Example 1.
[0048] The alkali-activated fly ash converted carbon nanotube / leucite porous ceramic composite material obtained in this example has uniform pores and a density of 1.4 g / cm 3 , the compressive strength is 30.2MPa, the total porosity is 40%, and the open porosity is 34%.
Embodiment 3
[0050] The difference from Example 2 is that the mass ratio of the carbon nanotubes to the alkaline silica sol excitation solution in step 3 is 1.35:17; / min rate is cooled to normal temperature, and other is identical with embodiment 2.
[0051] The alkali-activated fly ash converted carbon nanotube / leucite porous ceramic composite material obtained in this example has uniform pores and a density of 1.4 g / cm 3 , the compressive strength is 23.7MPa, the total porosity is 39%, and the open porosity is 34%.
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Abstract
The invention provides a preparation method of an alkali-activated fly ash-converted carbon nanotube / leucite porous ceramic composite material, belonging to the technical field of green preparation of waste residue porous materials. The preparation method comprises the following steps: pretreatment of fly ash and carbon nanotubes; preparation of an alkaline silica sol activation solution; mixing of the carbon nanotubes and the alkaline silica sol activation solution; pore forming of mixed slurry; low-temperature curing molding of a porous precursor; and high-temperature sintering ceramization. According to the invention, the porous ceramic material is prepared by taking the fly ash as a raw material, allowing the fly ash to participate in room-temperature synthesis of an alkaline inorganic precursor and synchronous and uniform dispersion of the carbon nanotubes and combining room-temperature pore-forming and subsequent high-temperature calcination treatment, so problems in resource utilization of the fly ash, green preparation of porous ceramic, strength and the like are solved, the carbon nanotube / leucite porous ceramic composite material is obtained, the mechanical strength and porosity of the porous material are improved, and recycling of fly ash and preparation of a low-cost nanometer reinforced porous material are realized.
Description
technical field [0001] The invention belongs to the technical field of green preparation of waste slag porous materials, and relates to a preparation method of carbon nanotube / leucite porous ceramic composite material transformed by alkali-activated fly ash, in particular to a method of using fly ash as a raw material to participate in alkaline inorganic The room temperature synthesis of the precursor and the uniform dispersion characteristics of the carbon nanotubes, combined with the subsequent high-temperature calcination, is a method for preparing the carbon nanotube / leucite porous ceramic composite material. Background technique [0002] Ceramic materials themselves have stable physical and chemical properties, such as wear resistance, high temperature resistance, corrosion resistance, etc., so porous ceramics also have the general advantages of ceramics. In addition, because porous ceramics have a certain porosity, they can also be used as filtration, sound insulation,...
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