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High intensity microporous mullite refractory aggregate and preparation method thereof

A refractory aggregate and mullite technology, applied in the field of high-strength microporous mullite refractory aggregate and its preparation, can solve the problems of low production efficiency, poor corrosion resistance, unevenness, etc. The effect of high compressive strength and low thermal conductivity

Active Publication Date: 2017-08-18
ANHUI JINYAN GAOLING SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main defects of this method are: (1) the large amount of water added leads to a long drying time of the product and low production efficiency; (2) adding sawdust as a pore-forming agent, the pores produced after burning out are large and uneven, resulting in product strength (3) The impurity content in coal gangue and sawdust raw materials is relatively high, which makes the prepared light mullite use temperature not high
[0005] To sum up, the current production of lightweight mullite aggregates generally consumes a lot of energy, and the obtained strength can only meet the needs of the insulation layer, and it is difficult to meet the needs of the working layer of industrial furnaces.

Method used

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  • High intensity microporous mullite refractory aggregate and preparation method thereof
  • High intensity microporous mullite refractory aggregate and preparation method thereof
  • High intensity microporous mullite refractory aggregate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A high-strength microporous mullite refractory aggregate and a preparation method thereof. The preparation method described in this embodiment is:

[0033] (1) With 50-55wt% kaolin fine powder and 45-50wt% active α-Al 2 o 3 Micropowder is used as a raw material, and 2-2.5 wt% of dextrin, 1-1.7 wt% of metal aluminum powder and 1-1.4 wt% of carbon black are added to the raw materials, and the mixture is uniformly mixed to obtain a mixture.

[0034] (2) Mix 3-5wt% of aluminum sol, 1-1.5wt% of silica sol, 0.5-0.6wt% of spodumene and 2-3wt% of water as raw materials to prepare a slurry for later use.

[0035] (3) Put the mixture into a disc granulator, and spray the slurry while granulating to obtain granules with a particle diameter of 1-10 mm.

[0036] (4) Dry the particles naturally for 24 hours, then dry them at 100-110°C for 24-48 hours, then raise the temperature to 1200-1300°C, keep them warm for 2-4 hours, cool them naturally, and sieve them to obtain high-strengt...

Embodiment 2

[0039]A high-strength microporous mullite refractory aggregate and a preparation method thereof. The preparation method described in this embodiment is:

[0040] (1) With 55-58wt% kaolin fine powder and 42-47wt% active α-Al 2 o 3 Micropowder is used as a raw material, 2.4-2.9 wt% of dextrin, 1.6-2.3 wt% of metal aluminum powder and 1.3-1.7 wt% of carbon black are added to the raw materials, and the mixture is uniformly mixed to obtain a mixture.

[0041] (2) Mix 4-6wt% of aluminum sol, 1.3-1.8wt% of silica sol, 0.6-0.7wt% of spodumene and 3-4wt% of water to prepare a slurry for later use.

[0042] (3) Put the mixture into a disc granulator, and spray the slurry while granulating to obtain granules with a particle diameter of 1-10 mm.

[0043] (4) Dry the granules naturally for 24 hours, then dry them at 100-110°C for 24-48 hours, then raise the temperature to 1250-1350°C, keep them warm for 2-4 hours, cool naturally, and sieve to obtain high-strength microporous mullite St...

Embodiment 3

[0046] A high-strength microporous mullite refractory aggregate and a preparation method thereof. The preparation method described in this embodiment is:

[0047] (1) With 56-61wt% kaolin fine powder and 39-44wt% active α-Al 2 o 3 Micropowder is used as a raw material, and 2.8-3.3 wt% of dextrin, 2.2-2.9 wt% of metal aluminum powder and 1.6-2.0 wt% of carbon black are added to the raw materials, and the mixture is uniformly mixed to obtain a mixture.

[0048] (2) Mix 5-7wt% of aluminum sol, 1.6-2.1wt% of silica sol, 0.7-0.8wt% of spodumene and 4-5wt% of water to prepare a slurry for later use.

[0049] (3) Put the mixture into a disc granulator, and spray the slurry while granulating to obtain granules with a particle diameter of 1-10 mm.

[0050] (4) Dry the granules naturally for 24 hours, then dry them at 100-110°C for 24-48 hours, then raise the temperature to 1300-1400°C, keep them warm for 2-4 hours, cool naturally, and sieve to obtain high-strength microporous mullit...

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Abstract

The invention relates to a high intensity microporous mullite refractory aggregate and a preparation method thereof. The technical solution thereof is: first using 50-70wt% of kaolin fine powder and 30-50wt% of active alpha-Al2O3 micropowder as raw materials, and additionally adding raw materials of 2-5wt% of dextrin, 1-5wt% of metal aluminum powder and 1-3wt% of carbon black for mixing evenly to obtain a mixture; evenly mixing the raw materials of 3-10wt% of alumina sol, 1-3wt% of silica sol, 0.5-1.0wt% of spodumene and 2-8wt% of water to prepare slurry; placing the mixture in a disk for pelleting, and spraying the slurry while pelleting to prepare particles with a particle size of 1-10mm; and naturally drying the particles, then drying same under the condition of 100-110 DEG C, then rising the temperature to 1200-1600 DEG C, maintaining the temperature for 2-4h, naturally cooling, and screening to prepare the high intensity microporous mullite refractory aggregate. The invention has characteristics of simple process and low preparation power consumption, and the prepared product has great compression strength, high using temperature, low volume density, and small heat conductivity coefficient.

Description

technical field [0001] The invention belongs to the technical field of mullite refractory aggregate. In particular, it relates to a high-strength microporous mullite refractory aggregate and a preparation method thereof. Background technique [0002] Mullite is Al 2 o 3 -SiO 2 It is the only stable binary compound in the system. It has the characteristics of high melting point (1850°C), low thermal expansion coefficient, low thermal conductivity, and good chemical stability. It is an ideal high-grade refractory material and is widely used in glass, metallurgy, and ceramics. and other industries. [0003] There are very few natural mullite minerals in nature, and industrial mullite is mainly artificially synthesized. In the prior art, the methods for synthesizing mullite mainly include electric melting method and sintering method. The electrofusion method is mainly made of high alumina, industrial alumina and refractory clay as raw materials in an electric arc. This met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/185C04B38/06C04B38/02
Inventor 桑绍柏舒小妹李亚伟徐义彪王庆虎
Owner ANHUI JINYAN GAOLING SCI & TECH CO LTD
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