Raw material formulation and method for preparing aluminum titanate-mullite multiple phase material by using aluminum section plant sludge

An aluminum profile factory and aluminum titanate technology, which is applied in the field of preparing aluminum titanate-mullite composite materials, can solve the difficulties in the preparation and use of aluminum titanate materials, reduce the content and performance of aluminum titanate, unstable compounds, etc. problems, to save energy and raw material processing costs, improve high-temperature performance, and high activity

Inactive Publication Date: 2009-03-11
FUZHOU UNIV
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AI Technical Summary

Problems solved by technology

Aluminum titanate material is a new type of ceramic material, which has excellent properties such as close to zero thermal expansion coefficient, low thermal conductivity, high melting point, and thermal shock resistance. It is currently the best high-temperature resistant material among low-expansion materials. ; but aluminum titanate is an unstable compound, which will decompose into Al between 800-1300°C 2 o 3 and TiO 2 , thereby reducing the content and performance of aluminum titanate, which brings difficulties to the preparation and use of aluminum titanate materials
[0003] After searching, there is no report on the preparation of aluminum titanate-mullite composite material by using industrial sludge from aluminum profile factories at home and abroad. This project is the first technology researched and invented at home and abroad.

Method used

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preparation example Construction

[0014] The specific steps of the preparation method of aluminum titanate-mullite composite material using the sludge of aluminum profile factory are as follows:

[0015] (A) According to the formula, the aluminum profile factory sludge, kaolin and TiO 2 Place in a ball mill and grind for 12-24 hours, and the ground slurry is filtered, dehydrated, dried and crushed to obtain a total material of less than 80 meshes.

[0016] (B) Adding 6-7% of the weight of the total material to the grinding material for mixing, the mixing is uniform, and the mixed material is semi-dry pressed.

[0017] (C) Dry the formed billet at 100°C for 24 hours, place the dry billet in a kiln for reaction sintering, the reaction sintering temperature is 1300-1500°C, the reaction sintering holding time is 1-6 hours, and cool to room temperature to prepare aluminum titanate — There are four crystal phases in the mullite composite material: aluminum titanate, mullite, Al 2 o 3 and TiO 2 , in which aluminu...

Embodiment 1

[0019] The weight ratio of the raw material formula of this example: the aluminum profile factory sludge is 68wt%, kaolin is 7wt%, TiO 2 is 25wt%. Weigh the three raw materials according to the formula, place them in a ball mill for wet grinding for 24 hours, filter and dehydrate the ground slurry, dry at 100°C for 24 hours, and crush to obtain a total material of less than 80 meshes. 6% water is added to the ground material for mixing, the mixing is uniform, and the mixture is semi-dry pressed. The formed billet was dried at 100°C for 24 hours, and the dry billet was placed in a kiln for reaction sintering. The reaction sintering temperature was 1420°C, the reaction sintering holding time was 2 hours, and naturally cooled to room temperature to prepare the aluminum titanate-mullite composite phase. The crystal phase content of the material: aluminum titanate is 68.0wt%, mullite is 8.1wt%, Al 2 o 3 15.9wt%, TiO 2 is 8.0 wt%.

Embodiment 2

[0021] The weight ratio of the raw material formula of this example: the aluminum profile factory sludge is 67wt%, kaolin is 13wt%, TiO 2 is 20wt%. Weigh the three raw materials according to the formula, place them in a ball mill for wet grinding for 24 hours, filter and dehydrate the ground slurry, dry at 100°C for 24 hours, and crush to obtain a total material of less than 80 meshes. 6% water is added to the ground material for mixing, the mixing is uniform, and the mixture is semi-dry pressed. The formed billet was dried at 100°C for 24 hours, and the dry billet was placed in a kiln for reaction sintering. The reaction sintering temperature was 1420°C, the reaction sintering holding time was 2 hours, and naturally cooled to room temperature to prepare the aluminum titanate-mullite composite phase. The crystal phase content of the material: aluminum titanate is 60.8wt%, mullite is 22.7wt%, Al 2 o 3 11.5wt%, TiO 2 is 5.0 wt%.

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Abstract

This invention relates to method for preparing aluminium titanate-mullite complex material made from mainly waste-mud from aluminium shaped material factory. The raw materials waste-mud, Kaolin and titanium oxide (TiO2) are mixed, pressed into shaped blocks, high temperature reacted to produce this inventive complex materials. This invention is of waste solids reutilization, with easy available of raw material, simple preparation method to produce excellent refractory, and having economic benefit.

Description

technical field [0001] The invention relates to an ecological environment material, that is, comprehensive utilization of solid waste, and more particularly relates to a raw material formula and method for preparing aluminum titanate-mullite composite material from sludge of an aluminum profile factory. technical background [0002] Aluminum profile factories will produce a large amount of milky white colloidal waste liquid during the surface treatment of aluminum profiles. The particles in this waste liquid are ultra-fine and highly dispersed. Once discharged directly, it will inevitably cause serious pollution to the environment and river waters, and destroy the ecological environment. . Therefore, a large amount of sludge in the waste liquid must be precipitated and filtered, and the remaining clarified filtrate should be discharged. A large aluminum profile factory can recycle more than 10,000 tons of sludge per year. There are hundreds of domestic aluminum profile comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/478C04B35/185
Inventor 阮玉忠沈阳于岩吴任平王成勇
Owner FUZHOU UNIV
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