High-purity high-strength light-weight mullite refractory aggregate and preparation method thereof

A technology of lightweight mullite and refractory aggregate, applied in the field of refractory materials, can solve the problems of difficulty in meeting the development needs of lightweight unshaped refractory materials, inability to balance heat insulation performance and strength, and poor high-temperature volume stability, etc., to achieve maintenance Overall structure, less impurity components, high compressive strength effect

Inactive Publication Date: 2012-09-05
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the aggregates currently used generally have some shortcomings such as the introduction of many impurities, poor high-temperature volume stability, and inability to balance heat insulation performance and strength, making it difficult to meet the development needs of lightweight monolithic refractory materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Natural silica powder and Al 2 o 3 The industrial alumina with a content of more than 98% is prepared in a ratio of 28:72, plus 30% of anthracite, 4% of dextrin, and 0.4% of hydroxymethyl cellulose (all are percentages of the total weight of the starting material). After weighing the above raw materials, put them into the barrel mill together with the grinding medium corundum balls and water. The ratio of the three is that raw material: grinding medium: water is 1:1:1 (mass ratio). The rotating speed of the barrel mill was set at 20r / m, and the co-grinding time was 24h.

[0020] The co-ground raw materials are introduced into a vacuum filter press for pressure filtration, and the filtered slurry is put into a mud extruder after being smelted, and cut to obtain a square green body after extrusion. The green body is first placed at room temperature for natural drying for 48 hours. Afterwards, the body after natural drying was dried in a dryer at 110°C for 24 hours. T...

Embodiment 2

[0022] Natural silica powder and Al 2 o 3 The industrial alumina with a content greater than 98% is prepared in a ratio of 25:75, plus 30% carbon black, 5% dextrin, and 0.7% hydroxymethyl cellulose (both percentages of the starting material). After weighing the above raw materials, put them into the barrel mill together with the grinding medium corundum balls and water. The ratio of the three is that raw material: grinding medium: water is 1:1:1.2 (mass ratio). The rotating speed of the barrel mill was set at 20r / m, and the co-grinding time was 24h. The co-ground material is introduced into a vacuum filter press for pressure filtration, and the filtered slurry is put into a mud extruder after being smelted, and cut to obtain a square green body after extrusion. The green body was first placed at room temperature for natural drying for 36 hours. Afterwards, the body after natural drying was dried in a dryer at 110°C for 36 hours. The dried green body is put into the kiln f...

Embodiment 3

[0024] Natural silica powder and Al 2 o 3 The industrial alumina with a content greater than 98% is prepared in a ratio of 20:80, plus 28% graphite, 6% dextrin, and 0.7% hydroxymethyl cellulose (both percentages of the starting material). After weighing the above raw materials, put them into the barrel mill together with the grinding medium corundum balls and water. The ratio of the three is that raw material: grinding medium: water is 1:1:1.3 (mass ratio). The rotating speed of the barrel mill was set at 24r / m, and the co-grinding time was 36h. The co-ground material is introduced into a vacuum filter press for pressure filtration, and the filtered slurry is put into a mud extruder after being smelted, and cut to obtain a square green body after extrusion. The green body is first placed at room temperature for natural drying for 72 hours. Afterwards, the body after natural drying was dried in a dryer at 110°C for 24 hours. The dried green body is put into the kiln for hi...

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Abstract

The invention discloses a high-purity high-strength light-weight mullite refractory aggregate and a preparation method thereof. Natural silica and industrial high-purity alumina are taken as initial materials and a bonder, an additive and a carbonaceous ignition loss substance evaporable at high temperature are added into the initial materials; and the method comprises the following steps of: performing wet grinding and vacuum filter-press forming; drying and calcining a blank; and crushing the calcined product to obtain the high-purity high-strength light-weight mullite refractory aggregate.The initial materials comprise 20 to 30 weight percent of natural silica and 70 to 80 weight percent of industrial high-purity alumina; and the addition amount of the bonder, additive and carbonaceous ignition loss substance respectively accounts for 4 to 6 percent, 0.3 to 1.0 percent and 25 to 35 percent of the total weight of the initial materials. The light-weight mullite refractory aggregate has excellent performance such as high purity, good volume stability at high temperature, good thermal insulation, high strength and the like.

Description

technical field [0001] The invention relates to a refractory aggregate used in the field of refractory materials, in particular to a high-purity, high-strength lightweight mullite refractory aggregate for lightweight refractory materials and a preparation method. Background technique [0002] Lightweight refractory materials can be divided into two categories according to the use temperature. One is the common type, whose service temperature is usually lower than 1200°C; the other is advanced heat insulation material, whose use temperature is usually higher than 1500°C, but it is expensive and low in strength, and it is difficult to be widely used; while the use temperature is 1200-1500°C Most of the backings of industrial kilns and thermal equipment are shaped products, which have shortcomings such as poor integrity, low strength, and insufficient construction efficiency. Therefore, it is necessary to develop light-weight unshaped refractory materials with a temperature of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B14/04
Inventor 毕玉保周宁生张三华胡书禾王慧芳于仁红孟庆新
Owner HENAN UNIV OF SCI & TECH
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