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Mg-Al light thermal-insulated fireproof materials and method for preparing same

A refractory material, lightweight technology, applied in the field of lightweight thermal insulation materials to achieve uniform distribution of pores and high strength

Inactive Publication Date: 2008-10-29
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there is no alkaline light insulation material product at home and abroad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] A preparation method of a magnesium-aluminum light-weight thermal insulation refractory material: magnesite powder with a particle size of ≤44 μm, light-burned magnesia powder with a particle size of ≤88 μm, high-bauxite powder with a particle size of ≤44 μm, and bauxite powder with a particle size of ≤88 μm Al(OH) 3 Sawdust powder and sawdust powder with a particle size of ≤150 μm are respectively mixed with water at 10-70%, 0-50%, 20-35%, 0-60%, and 0-8% by weight. After 24 hours of being trapped, the material was pounded and shaped by hand. Naturally dry in the air for 24 hours, then dry at 110°C for 8 hours, and then burn at 1300-1400°C with a holding time of 1-8 hours. Apparent porosity can be obtained at 40-60%, bulk density at 1.5-2.0g / cm 3 The periclase-spinel alkaline lightweight insulation material.

Embodiment 2

[0013] A preparation method of a magnesium-aluminum light-weight thermal insulation refractory material: magnesite powder with a particle size of ≤88 μm, light-burned magnesia powder with a particle size of ≤44 μm, high-bauxite powder with a particle size of ≤44 μm, and bauxite powder with a particle size of ≤44 μm A1(OH) 3 Coke powder and coke powder with a particle size of ≤44μm are mixed in 20-80%, 0-30%, 20-70%, 0-60%, and 0-15% by weight, plus the above-mentioned mixture After the water with a content of 2-8% is stirred evenly, it is pressed into shape with a friction brick press. Dried in a desiccator at 110°C for 8 hours, fired at 1300-1500°C, and held for 1-8 hours. Alkaline light-weight thermal insulation materials with an apparent porosity of 40-60% and corundum and spinel as the main crystal phase can be produced.

Embodiment 3

[0015] A preparation method of a magnesium-aluminum light-weight thermal insulation refractory material: magnesite powder with a particle size of ≤88 μm, light-burned magnesia powder with a particle size of ≤44 μm, high-bauxite powder with a particle size of ≤44 μm, and bauxite powder with a particle size of ≤44 μm Al(OH) 3 Powder, anthracite coal powder with a particle size of ≤44 μm, and polylight balls with a particle size of ≤200 μm are respectively 20-80%, 0-40%, 20-70%, 0-60%, 0-5%, 0-2% mixing, add 2-10% water and 0-2% dextrin of the above-mentioned mixture, stir evenly, beat and shape by hand, dry at 110°C for 8 hours, and dry at 1300- Firing at 1500°C, the holding time is 1 to 8 hours. An alkaline light-weight thermal insulation refractory material with periclase-spinel as the main crystal phase and an apparent porosity of 40-70% can be obtained.

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PUM

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Abstract

The invention discloses an Mg-Al light thermal-insulated fireproof materials and method for preparation, which comprises mixing 10-80% (by weight ratio) 10-80% magnesite powder, 0-50 wt% of lightly combusted magnesium oxide powder, then mixing 20-70% of bauxite powder, 0-60% of Al2O3 powder, mixing 0-15% of combustible powder, 2-3% of water and 0-3% of bonding agent, stirring homogeneously, drying the formed blank 4-24 hours at 110 deg. C, then burning at 1300-1500 deg. C, thermally insulating 1-8 hours.

Description

1. Technical field [0001] The invention belongs to the field of lightweight thermal insulation refractory materials. In particular, it relates to a light-weight thermal insulation material with periclase, spinel and corundum as main phase components and a production method. 2. Background technology [0002] Most of the existing lightweight thermal insulation refractory materials are aluminum-silicon materials. The main chemical composition is Al 2 o 3 with SiO 2 . The main phases are corundum, mullite, quartz phase and glass phase. With the improvement of steel quality and variety requirements, the requirements for steel purity are getting higher and higher. Basic refractories are considered to be an ideal refractory material that can meet the requirements of pure steel production. In general, basic refractory materials, such as magnesia bricks, are directly used as furnace lining materials that are in direct contact with molten steel, and a layer of thermal insulatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/04C04B35/10C04B35/443C04B38/06
Inventor 李楠
Owner WUHAN UNIV OF SCI & TECH