Non-cement light alumina magnesia cast material and its prepn process

A cement-free and castable technology, applied in the field of refractory materials, can solve the problems of structural spalling and lowering of medium-temperature strength, and achieve the effects of high porosity, high medium-temperature strength, and high resistance to medium erosion.

Inactive Publication Date: 2007-11-07
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it uses calcium aluminate cement as the binder, and due to the mineral phase transformation during the heating process, the medium temperature strength is reduced, and the structure is easy to peel off, which limits the use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] An aluminum-magnesium-based lightweight cement-free castable and a preparation method thereof: porous spinel ceramics with a particle size of 5-3 mm, porous spinel ceramics with a particle size of 3-1 mm, and porous spinel ceramics with a particle size of 1-0.2 mm Porous spinel ceramics, magnesia fine powder, corundum fine powder, spinel fine powder, silica micropowder and activated α alumina micropowder respectively according to 10~30wt%, 20~40wt%, 10~25wt%, 1~20wt% 5wt%, 2~10wt%, 2~4wt%, 1~3wt% and 1~5wt% mixed, plus 10~12wt% water of the above mixture, 0.2wt% sodium hexametaphosphate and 0.05wt% citric acid Stir evenly, pour and vibrate to form. The molded green body is naturally dried in the air for 24 hours, and then dried at 110°C for 24 hours.

[0012] Among them, the apparent porosity of porous spinel ceramics is 40-45%, Al 2 o 3 The content is 68-71wt%, and the average pore size is 10-15μm; the particle size of magnesia fine powder is less than 88μm, and the...

Embodiment 2

[0015] An aluminum-magnesium-based lightweight cement-free castable and its preparation method: porous corundum-spinel ceramics with a particle size of 5-3 mm, porous corundum-spinel ceramics with a particle size of 3-1 mm, and a particle size of 1-0.2mm porous corundum-spinel ceramics, magnesia fine powder, corundum-spinel fine powder, corundum fine powder, silicon oxide fine powder and activated α-alumina fine powder are respectively 10-35wt%, 15-45wt% , 10-25wt%, 6-9wt%, 5-8wt%, 2-4wt%, 1-3wt% and 1-5wt% mixed, plus 11.5-13wt% water of the above-mentioned mixture, 0.25wt% tripolyphosphoric acid Sodium and 0.02wt% sodium citrate are evenly mixed, poured and vibrated to form. The molded green body is naturally dried in the air for 24 hours, and then dried at 110°C for 24 hours.

[0016] Among them, the apparent porosity of porous corundum-spinel ceramics is 45-50%, Al 2 o 3 The content is 78-82wt%, and the average pore size is 1-5μm; the particle size of magnesia fine powd...

Embodiment 3

[0019] An aluminum-magnesium-based lightweight cement-free castable and a preparation method thereof: porous corundum ceramics with a particle size of 5 to 3 mm, porous corundum ceramics with a particle size of 3 to 1 mm, and porous corundum ceramics with a particle size of 1 to 0.2 mm , magnesia fine powder, corundum fine powder, silicon oxide fine powder and activated α-alumina fine powder according to 10~30wt%, 20~50wt%, 10~25wt%, 4~8wt%, 10~15wt%, 2~4wt% respectively It is mixed with 3-5wt%, and 12.5-15wt% of water, 0.3wt% of sodium tripolyphosphate and 0.02wt% of citric acid are added to the above-mentioned mixture, mixed evenly, and poured and vibrated for molding. The molded green body is naturally dried in the air for 24 hours, and then dried at 110°C for 24 hours.

[0020] Among them, the apparent porosity of porous corundum ceramics is 38-45%, Al 2 o 3 content>95wt%, average pore size is 5-10μm; magnesia fine powder particle size is less than 44μm, MgO content>95wt...

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Abstract

The present invention relates to one kind of no-cement light alumina-magnesia cast material and its preparation process. The technological scheme is that the alumina-magnesia cast material is prepared with porous alumina-magnesia ceramic grain in 40-70 wt% and compact alumina-magnesia grain in 0-20 wt% as aggregate, and fine alumina-magnesia powder in 5-50 wt%, fine silica powder in 1-10 wt% and fine active alpha-alumina powder in 1-8 wt% as matrix, and through adding water in the quantity of 8-20 wt % and water reducing agent in 0-3 wt% , stirring, vibrating to form and drying at 110 deg.c for 8-48 hr. The alumina-magnesia cast material has MgO and Al2O3 as main chemical components, and main crystal phases of periclase, spinel and corundum. It may be contacted directly with refractory magnesia material and refractory spinel material at high temperature, and has the features of high porosity, small average pore size, high strength, etc.

Description

technical field [0001] The invention belongs to the technical field of refractory materials. In particular, it relates to an aluminum-magnesium light cementless castable and a preparation method thereof. Background technique [0002] In traditional refractory materials, dense materials are often used as aggregates. Dense aggregates require high-temperature firing, which consumes a lot of energy. During the use of refractory materials, solvents such as slag first corrode the matrix. The matrix surrounds the aggregate, and when the matrix is ​​eroded into a metamorphic layer, the aggregate is spalled with the matrix from the refractory into the slag. Therefore, in terms of corrosion resistance, the effect of dense aggregate is not obvious. With the increasing demand for energy saving, the research and development of lightweight insulation materials is developing rapidly. In terms of lightweight unshaped refractory materials, various lightweight castables have been studied...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B14/36B28B1/14B28B1/08C04B35/443
Inventor 李楠鄢文
Owner WUHAN UNIV OF SCI & TECH
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