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Light refractory bricks

A refractory brick and lightweight technology, applied in the field of refractory materials, can solve the problems of low thermal conductivity of refractory fiber, service life of lightweight refractory bricks, harmful refractory fibers, etc., and achieve the effect of reducing production costs and increasing selectivity

Inactive Publication Date: 2003-06-18
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to maintain the dual advantages of low thermal conductivity of refractory fiber and long service life of lightweight refractory bricks, overcome the disadvantage that refractory fiber is harmful to human body, and at the same time overcome the disadvantage that anorthite series refractory bricks cannot be directly used as kiln lining

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Examples

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Embodiment 1

[0028] according to figure 1 As shown, take calcined and ground coal gangue powder 31wt.%, kyanite 30wt.%, pure calcium aluminate cement 10wt.%, bauxite 19wt.%, kaolinite clay 5wt.%, Mongolian Destoned clay 5wt.%, after mixing in a mixer, add sodium citrate aqueous solution accounting for 35% of solids. The concentration of the sodium citrate aqueous solution is 0.5 wt.%. and mix into a homogeneous slurry. Prior to this, prepare rosin soap at a ratio of 0.13 for NaOH / rosin and prepare a foaming solution at a ratio of 1.2 for rosin soap / bone glue. While stirring the mud, put the foaming liquid into the foaming machine for foaming. It is necessary to grasp that when the mud is evenly stirred, the foaming machine can supply a sufficient amount of foam. The slurry is then mixed with the foam. The bulk density of anorthite combined with mullite lightweight refractory bricks is controlled by the amount of foam added. In this embodiment, the bulk density of the product is 0.48g...

Embodiment 2

[0041] according to figure 1 As shown, take kyanite 70wt.%, pure calcium aluminate cement 12wt.%, bauxite 3wt.%, kaolinite clay 4wt.%, montmorillonite clay 6wt.%, mix in the mixer Aqueous sodium citrate solution accounting for 37wt.% of solids was added after homogenization. The concentration of the sodium citrate aqueous solution is 0.5 wt.%. Then the solution is mixed with solid powder to form a uniform slurry. Prior to this, prepare rosin soap at a ratio of 0.13 for NaOH / rosin and prepare a foaming solution at a ratio of 1.2 for rosin soap / bone glue. While stirring the mud, put the foaming liquid into the foaming machine for foaming. It is necessary to grasp that when the mud is evenly stirred, the foaming machine can supply a sufficient amount of foam. The slurry is then mixed with the foam. The bulk density of anorthite combined with mullite lightweight refractory bricks is controlled by the amount of foam added. In this embodiment, the bulk density of the product i...

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Abstract

A light-weight refractory brick used for liner of high-temp furnace is prepared from mullite as primary crystal phase, huronite as binding phase, disthene and coal gangue. Its main chemical components are Al2O3 (54-57 wt.%), SiO2 (40-43), CaO (1-2), Fe2O3 (0.1-1) and impurities (0.1-0.7). Its advantages are light weight, low heat conductivity and volume density, and high strength.

Description

Technical field: [0001] The invention belongs to the field of refractory materials, and in particular relates to a high-quality refractory material for inner lining of high-temperature kilns with low thermal conductivity and long service life. Background technique: [0002] Due to the need for energy saving, the lightweight of various kiln linings has been paid more and more attention by the industry. Although the aluminum silicate refractory fiber used in a large amount at present has been fully confirmed in the aspect of kiln energy saving, there are three fatal weaknesses. The first is that the price is too expensive. For example, the price of polycrystalline mullite fiber is as high as 50,000 to 60,000 yuan per ton, and the price of zirconium-containing fiber and chromium-containing fiber is 2-3 yuan per ton; the second is the heat resistance limit of long-term use of refractory fibers. Mostly below 1200°C. Although polycrystalline mullite fiber can be used at 1300-140...

Claims

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Application Information

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IPC IPC(8): C04B35/185C04B35/63C04B35/64C04B35/66C04B38/02F27D1/00
Inventor 倪文李建平陈德平刘凤梅
Owner UNIV OF SCI & TECH BEIJING
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