Lightweight corundum-mullite castable and preparation method thereof

A technology of mullite and castables, which is applied in the field of lightweight castables, can solve the problems of inability to prepare structural refractory materials, low chemical purity of refractory materials, and inability to cast on-site molding, and achieve controllable apparent porosity and pore size, Strong resistance to medium erosion and convenient construction

Inactive Publication Date: 2013-08-14
WUHAN UNIV OF SCI & TECH
5 Cites 24 Cited by

AI-Extracted Technical Summary

Problems solved by technology

For example, in the literature on the preparation of mullite-corundum lightweight bricks (Yang Daoyuan et al., Preparation of high-strength and low-thermal conductivity mullite-corundum lightweight bricks, Rare Metal Materials and Engineering, 2009, 38 (2): 1237-1240), Using high-alumina bauxite and silica fume as the main raw materials and polystyrene balls as the pore-forming agent, the lightweight mullite-corundum material was prepared by gel injection molding. The burning of styrene balls causes environmental pollution, and the material has low strength (2.17MPa) and low chemical purity, so it cannot be used in the working layer of high-temperature kilns or containers
Another example is the patented technology of "a corundum-mullite lightweight brick and its preparation method (201110207949.5)", which uses high-alumina bauxite fine powder as t...
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Method used

This specific embodiment adopts " a kind of porous mullite ceramic material and its preparation method (CN 200610019552.2) " patented technology that the applicant applies for to prepare porous corundum-mullite ceramic particles and porous corundum-mullite ceramic particles The prepared porous corundum-mullite ceramic particles are used as porous aggregate, and the corundum-mullite ceramic fine powder and corundum fine powder are mainly used as substrates to prepare lightweight castables, and the preparation process is simple. The chemical composition of the prepare...
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Abstract

The invention relates to a lightweight corundum-mullite castable and a preparation method thereof. The the technical scheme is that the preparation method comprises the following raw materials of 40-70wt% of porous corundum-mullite ceramic particles, 10-25wt% of porous corundum-mullite ceramic fine powder, 10-20wt% of corundum fine powder, 1-3wt% of silicon oxide micro powder, 2-4wt% of active alpha aluminum oxide micro powder, 1-5wt% of calcium aluminate cement and 1-5wt% of rho aluminum oxide fine powder; water and a water reducing agent are taken as additives, wherein the weight of the water is 8-20wt% of that of the raw materials, and the weight of the water reducing agent is 0.02-1wt% of that of the raw materials; and the method comprises the steps of: evenly stirring, casting for molding, naturally drying a molded green body for 24h, and finally, drying the product for 8-48h at the temperature of 110 DEG C. The prepared product not only has the performances of high apparent porosity, high strength, low heat conductivity, high medium erosion resistance and the like, but also has the advantages of being convenient to construct, environment-friendly, controllable in apparent porosity and pore size, small in volume change after being burnt, and the like, thus being suitable for a working layer or a permanent layer of a high-temperature kiln or container with the working temperature lower than 1600 DEG C.

Technology Topic

Ceramic particleCement Material +16

Examples

  • Experimental program(6)

Example Embodiment

[0022] Example 1
[0023] A lightweight corundum-mullite castable and a preparation method thereof: 50-70wt% porous corundum-mullite ceramic particles, 10-20wt% porous corundum-mullite ceramic fine powder, 10-15wt% porous corundum-mullite ceramic powder, Corundum fine powder, 1~2wt% silica fine powder, 3~4wt% activated alpha alumina fine powder, 1~4wt% calcium aluminate cement and 3~5wt% ρ alumina fine powder are used as raw materials, and the The raw materials are 8~12wt% water, 0.1~0.3wt% sodium tripolyphosphate and 0.1~0.3wt% sodium hexametaphosphate, stir evenly, and cast molding; Dry under conditions for 8 to 18 hours.
[0024] In this embodiment: the particle gradation ratio of porous corundum-mullite ceramic particles is: 8~5mm accounts for 8~12wt% of raw materials, 5~3mm accounts for 18~24wt% of raw materials, 3~1mm accounts for 18~24wt% of raw materials, 1~0.1mm accounts for 6~10wt% of raw materials; corundum fine powder is fused white corundum fine powder, and the particle size is less than 88μm.
[0025] The light corundum-mullite castable prepared in this example is tested: the apparent porosity is 31-41%, and the bulk density is 2.25-1.93 g/cm 3 , the flexural strength is 3~8MPa; fired at 1450~1600℃, the holding time is 3~8 hours, after testing: the apparent porosity is 33~43%, and the bulk density is 2.23~1.91g/cm 3 , the average pore size is 5~15μm, and the flexural strength is 8~16MPa.

Example Embodiment

[0026] Example 2
[0027] A lightweight corundum-mullite castable and preparation method thereof: 40-60wt% porous corundum-mullite ceramic particles, 15-25wt% porous corundum-mullite ceramic fine powder, 15-20wt% porous corundum-mullite ceramic powder, Corundum fine powder, 2~3wt% silica fine powder, 2~3wt% activated alpha alumina fine powder, 3~5wt% calcium aluminate cement and 2~4wt% ρ alumina fine powder are used as raw materials, and the The raw materials are 12~16wt% water and 0.02~0.4wt% sodium tripolyphosphate, stir evenly, cast and form; the formed body is naturally dried for 24 hours, and then dried at 110 ° C for 16~32 hours.
[0028] In this embodiment, the particle gradation ratio of porous corundum-mullite ceramic particles is: 5~3mm accounts for 15~22wt% of raw materials, 3~1mm accounts for 15~22wt% of raw materials, and 1~0.1mm accounts for 10~16wt% of raw materials ; Corundum fine powder is sintered tabular corundum fine powder, the particle size is less than 88μm.
[0029] The light corundum-mullite castable prepared in this example is tested: the apparent porosity is 39-47%, and the bulk density is 2.00-1.82 g/cm 3 and light corundum-mullite castables with flexural strength of 2~4MPa; fired at 1450~1600℃, holding time for 3~8 hours, after testing: apparent porosity is 41~49%, volume The density is 1.98~1.81g/cm 3 , the average pore size is 3~12μm, and the flexural strength is 4~9MPa.

Example Embodiment

[0030] Example 3
[0031] A light-weight corundum-mullite castable and a preparation method thereof: 40-70wt% porous corundum-mullite ceramic particles, 10-25wt% porous corundum-mullite ceramic fine powder, 10-20wt% porous corundum-mullite ceramic powder, Corundum fine powder, 2~3wt% silica fine powder, 2~4wt% activated alpha alumina fine powder, 3~5wt% calcium aluminate cement and 3~5wt% ρ alumina fine powder are used as raw materials, and the The raw materials are 15~20wt% water and 0.5~1wt% dispersible alumina, stir evenly, cast and form; the formed body is naturally dried for 24 hours, and then dried at 110°C for 30~48 hours.
[0032] In this embodiment: the particle gradation ratio of porous corundum-mullite ceramic particles is: 3~1mm accounts for 15~30wt% of raw materials, 1~0.1mm accounts for 25~40wt% of raw materials; the composition of corundum fine powder is: The white corundum fine powder accounts for 6~9wt% of the raw material, and the sintered tabular corundum fine powder accounts for 6~9wt% of the raw material, and the particle size is less than 88 μm.
[0033] The light corundum-mullite castable prepared in this example is tested: the apparent porosity is 43-53%, and the bulk density is 1.92-1.58 g/cm 3 , the flexural strength is 1~3MPa; fired at 1450~1600℃, the holding time is 3~8 hours, after testing: the apparent porosity is 44~55%, and the bulk density is 1.92~1.56g/cm 3 , the average pore size is 5~15μm, and the flexural strength is 3~6MPa.
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PUM

PropertyMeasurementUnit
Particle size<= 88.0µm
Bulk density1.93 ~ 2.25g/cm³
Flexural strength3.0 ~ 8.0MPa
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

  • High apparent porosity
  • Simple preparation process
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