High-strength porous ceramics and low-temperature preparation method thereof

A porous ceramic, high-strength technology, applied in the field of porous ceramics, can solve the problems of low mechanical strength and high sintering temperature, and achieve the effects of excellent mechanical properties, high mechanical strength and low density

Inactive Publication Date: 2018-09-18
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The patent "foam sound-absorbing material produced by using ceramic waste and its preparation method" (CN102936151A) uses ceramic waste and ultra-fine kaolin as the main raw materials, adopts organic precursor impregnation method, and prepares foam sound-absorbing material by high-temperature firing , but the firing temperature is still high (1350-1450°C), and the mechanical strength is low

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  • High-strength porous ceramics and low-temperature preparation method thereof

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Effect test

Embodiment 1

[0035] A preparation method of high-strength porous ceramics, comprising the following steps: the percentages in the examples are mass percentages;

[0036] (1) Construction waste (mainly composed of SiO 2 : 23.5%, Al 2 o 3 : 35.0%, Fe 2 o 3 : 6.5%, CaO: 21.7%, MgO: 3.7%, Na 2 O: 2.1%, K 2 O: 2.9%, etc.) 55.2%, low-grade aluminum ore (the main component is Al 2 o 3 : 62.3%, SiO 2 : 9.1%, Fe 2 o 3 : 13.5%, TiO 2 : 4.5%, K 2 O: 6.9%, etc.) 34.8%, Na 2 CO 3 6.0%, Borax 2.0%, K 3 PO 4 2.0%, proportioned ingredients, with a ball mill at a speed of 400r / min, ball milling and mixing for 12 hours to obtain mixed raw materials;

[0037] (2) Compress the mixed raw materials under 100 MPa, dry (40° C.) to obtain a green body; the mixed raw materials can be granulated first, and then pressed to form;

[0038] (3) Put the body into a high-temperature furnace, heat up to 1050°C at a heating rate of 35°C / min for firing, and hold for 200 minutes to obtain a high-strength po...

Embodiment 2

[0041] A preparation method of high-strength porous ceramics, comprising the following steps: the percentages in the examples are mass percentages;

[0042] (1) Coal gangue (mainly composed of SiO 2 : 51.0%, Al 2 o 3 : 39.0%, Fe 2 o 3 : 2.2%, CaO: 0.9%, TiO 2 : 2.7%, K 2 O: 1.9%, Na 2 O: 0.8%, MgO: 1.3%) 33.0%, ceramic waste slag (mainly composed of SiO 2 : 48.7%, Al 2 o 3 : 32.0%, Fe 2 o 3 : 2.4%, TiO 2 : 1.5%, K 2 O: 3.4%, Na 2 O: 2.8%, MgO: 8.6%) 21.0%, low-grade clay ore (mainly composed of SiO 2 : 48.7%, Al 2 o 3 : 34.7%, Fe 2 o 3 : 2.5%, Na 2 O: 3.5%, TiO 2 : 2.5%, K 2 O: 3.8%) 10.2%, low-grade potassium feldspar (mainly composed of SiO 2 : 63.0%, Al 2 o 3 : 16.7%, K 2 O: 4.7%, Fe 2 o 3 : 4.5%, Na 2 O: 3.5%, etc.) 13.8%, KNO 3 12.0%, Phosphate (NaH 2 PO 4 and K 3 PO 4 , content is respectively 7.0%, 3.0%) 10.0%, proportioned ingredients, with ball mill with 700r / min rotating speed, ball mill mixing 4h, obtains the raw material of mixing;...

Embodiment 3

[0047] A preparation method of high-strength porous ceramics, comprising the following steps: the percentages in the examples are mass percentages;

[0048] (1) Low-grade clay ore (mainly composed of SiO 2 : 47.3%, Al 2 o 3 : 26.8%, Fe 2 o 3 : 2.8%, Na 2 O: 3.5%) 37.8%, low-grade bauxite (the main component is Al 2 o 3 : 62.9%, SiO 2 : 10.4%, Fe 2 o 3 : 11.8%, TiO 2 : 4.5%, K 2 O: 5.2%) 30.0%, low-grade mica ore (mainly composed of SiO 2 : 68.0%, Al 2 o 3 : 20.3%, Fe 2 o 3 : 1.9%, K 2 O: 4.7%) 12.2%, Na 2 HPO 4 8.0%, Sulfate (CaSO 4 and MgSO 4 , the contents were 6.0% and 2.0% respectively) 8.0%, MgCO 3 4.0%, proportioned ingredients, using a ball mill with a rotating speed of 800r / min, ball milling and mixing for 0.5h, to obtain mixed raw materials;

[0049] (2) Compress the mixed raw materials at 200MPa, dry (120°C) to obtain a green body; the mixed raw materials can be granulated first, and then pressed into shape; the mixed raw materials can first p...

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Abstract

The invention belongs to the technical field of porous ceramics, and discloses high-strength porous ceramics and a low-temperature preparation method thereof. The method comprises the steps: (1) mixing raw materials, wherein the raw materials include solid waste, low-grade minerals and an additive, and the raw materials also include an aluminum source when an aluminum element in the raw materialsis insufficient; (2) molding the mixed raw materials into green bodies; (3) firing the green bodies at the temperature of 800-1300 DEG C to obtain the high-strength porous ceramics, wherein the additive is one or more of alumina, nitrate, carbonate, sulfate, phosphate, fluoride and borax. The solid waste and the low-grade minerals are used as a part of the raw materials, the recovery and utilization of resources are realized, and the method is environmentally friendly and economical; the method has the advantages of wide range of the raw materials, simple process (one-step in-situ preparationof a whisker skeleton structure), and low production cost, and is suitable for industrial production. At the same time, the method has less energy consumption, and the prepared porous ceramics have the whisker skeleton structure and have the advantages of high porosity, low density and high mechanical strength.

Description

technical field [0001] The invention belongs to the technical field of porous ceramics, and relates to a high-strength porous ceramic and a low-temperature preparation method thereof, in particular to a porous ceramic with a whisker skeleton structure and a low-temperature preparation method thereof. Background technique [0002] Porous ceramics have functions such as heat preservation, heat insulation, sound absorption, water retention, water absorption, filtration, and catalyst carrier, and are widely used in various fields such as construction, chemical industry, light industry, metallurgy, and agriculture. The strength is generally relatively low, so porous ceramics with whisker skeleton structure reinforcement have good development prospects. [0003] In addition, my country's solid waste and low-grade minerals have increased sharply. A large amount of solid waste and low-grade minerals accumulated and landfilled not only occupy fertile land, pollute water and soil reso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B33/132C04B33/135C04B33/138C04B35/80C04B33/04C04B111/40
CPCC04B33/04C04B33/132C04B33/1324C04B33/1352C04B33/138C04B35/80C04B38/00C04B2111/40C04B2235/3217C04B2235/3409C04B2235/3463C04B2235/3472C04B2235/447C04B2235/448Y02P40/60
Inventor 税安泽花开慧马娟胡家兴李秋玲高小云
Owner SOUTH CHINA UNIV OF TECH
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