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Mullite-chromium light weight castable

A technology of lightweight castables and mullite, applied in the field of high-temperature refractory materials, can solve problems such as aggravating sample damage, and achieve the effects of reducing thermal conductivity, reducing bulk density, and benefiting bulk density

Active Publication Date: 2017-06-09
JIAOZUO JINXIN HENGTUO REFRACTORIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the increase of deposited carbon, the structure of the sample becomes loose, which further promotes the carbon deposition reaction and aggravates the damage of the sample.

Method used

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Embodiment Construction

[0021] The present invention will be further described below in combination with specific embodiments, which are not intended to limit the protection scope thereof.

[0022] In order to avoid repetition, the technical parameters involved in this specific embodiment are now described in a unified manner as follows, and will not be repeated in the implementation:

[0023] Mullite microporous balls are characterized by the use of raw materials to self-decompose into pores, and the pore size distribution is controlled by controlling the internal reaction sintering process. The aggregate is fired in a high-temperature kiln without adding coal powder and other impurity materials during production. The main crystal phase is mullite. The mullite microporous spheres, Al 2 o 3 ≥65%, Fe 2 o 3 ≤1.5%, K 2 O+Na 2 O≤0.65%, bulk density≤1.5g / cm 3 , particle size 8-0.3mm.

[0024] The low-iron three-grade high-alumina clinker powder is characterized in that high-quality three-grade hig...

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Abstract

The invention provides a mullite-chromium light weight castable. The mullite-chromium light weight castable is prepared from the following raw materials in parts by weight: 50 to 65 percent by weight of mullite microporous spheres, 20 to 45 percent by weight of low-iron three-grade high-aluminum clinker powder, 1 to 5 percent by weight of chrome oxide green, 3 to 8 percent by weight of silica micropowder, 4 to 7 percent by weight of pure calcium aluminate cement, and 0.01 to 0.5 percent by weight of a dispersing agent; the mullite microporous spheres are spherical mullite granules formed by secondary granulation sintering of raw ores; the content of Fe2O3 in the low-iron three-grade high-aluminum clinker powder is not greater than 1.5 percent by weight. The mullite-chromium light weight castable has the advantages of higher strength at normal temperature and high temperature, good volume stability and lower heat conduction coefficient; direct reduction of nodules on the surface of an iron furnace lining can be reduced, and the aims of reducing the usage of a furnace lining material, saving energy and prolonging the service life of the furnace lining are achieved.

Description

technical field [0001] The invention relates to a mullite-chromium lightweight castable and a method thereof, belonging to the technical field of high-temperature refractory materials. Background technique [0002] Because low-cement and high-alumina castables have the characteristics of low impurity content, high strength at room temperature and high temperature, and stable volume, low-cement and high-alumina castables are widely used in the working layer of high-temperature furnaces. Low-cement and high-alumina castables mostly use high-alumina clinker as aggregate, so low-cement and high-alumina castables have a higher volume density, generally 2.2~2.7g / cm3 3 , The thermal conductivity at 1000°C is 0.9~1.5W / m.K. [0003] According to the basic principles of heat transfer, materials with light weight, micropores and closed cells have lower thermal conductivity. Ordinary porous clinker is sintered by adding coal powder and organic matter pressure balls to raw bauxite. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
CPCC04B35/66
Inventor 李彩霞刘涛生许兴堂李超薛鸿雁
Owner JIAOZUO JINXIN HENGTUO REFRACTORIES
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