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Magnesia-alumina spinel material prepared by waste activated alumina and preparation method thereof

A technology of activated alumina and magnesia-aluminum spinel, which is applied to the removal of solid waste, etc., to achieve the effect of increasing the crystal phase content, no risk of investment, and quick return on investment

Inactive Publication Date: 2009-11-18
FUZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After searching, there is no report on the preparation of magnesia-aluminum spinel materials by using waste activated alumina in China

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The weight ratio of the raw material formula of this example: waste activated alumina is 50wt%, basic magnesium carbonate is 50wt%. The two raw materials are weighed according to the formula, placed in a ball mill for wet grinding for 24 hours, the ground slurry is filtered, dehydrated, dried and crushed, and the obtained grinding material is mixed by adding 6 wt% water to the grinding material. After the mixture is evenly mixed, the mixture is pressed into shape; the molded billet is dried at 100°C for 24 hours, and the dry billet is placed in a kiln for reaction and sintering at 1410°C. After 3 hours of heat preservation, it is cooled to room temperature to obtain a magnesium aluminum spinel material. The magnesium aluminum spinel content is 91.5wt%, the flexural strength is 65Mpa, and the bulk density is 2.56g / cm 3 , The porosity is 26%.

Embodiment 2

[0021] The weight ratio of the raw material formula of this example: waste activated alumina is 52wt%, basic magnesium carbonate is 48wt%. The two raw materials are weighed according to the formula, placed in a ball mill for wet grinding for 24 hours, the ground slurry is filtered, dehydrated, dried and crushed, and the obtained grinding material is mixed by adding 6 wt% water to the grinding material. After the mixture is evenly mixed, the mixture is pressed into shape; the molded billet is dried at 100°C for 24 hours, and the dry billet is placed in a kiln for reaction and sintering at 1450°C. After 4 hours of heat preservation, it is cooled to room temperature to obtain magnesium aluminum spinel material magnesium The aluminum spinel content is more than 93.2wt%, the flexural strength is 71.6Mpa, and the bulk density is 2.72g / cm 3 , The porosity is 23.6%.

Embodiment 3

[0023] The weight ratio of the raw material formula of this example: waste activated alumina is 54wt%, basic magnesium carbonate is 46wt. The two raw materials are weighed according to the formula, placed in a ball mill for wet grinding for 24 hours, the ground slurry is filtered, dehydrated, dried and crushed, and the obtained grinding material is mixed by adding 6 wt% water to the grinding material. After the mixture is evenly mixed, the mixture is pressed and molded; the molded billet is dried at 100°C for 24 hours, and the dry billet is placed in a kiln for reaction and sintering at 1480°C. After 2 hours of heat preservation, it is cooled to room temperature to obtain a magnesium aluminum spinel material. The magnesium aluminum spinel content is more than 95.4wt%, the flexural strength is 80.1Mpa, and the bulk density is 2.85g / cm 3 , The porosity is 20.8%.

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Abstract

The invention provides a magnesia-alumina spinel material prepared by waste activated alumina and a preparation method thereof. The raw material formula mainly comprises the waste activated alumina and basic magnesium carbonate; and the preparation method comprises the following steps of: taking the waste activated alumina and the basic magnesium carbonate as raw materials, mixing, pressing and forming the raw materials, leading the raw materials to react at high temperature, cooling the reaction products, thus obtaining the prepared magnesia-alumina spinel material. The material and the method are beneficial for waste utilization and solve the severe pollution of the waste activated alumina on the environment; the produced products have high-quality refractories which have high added value and no pollution, save the production cost, and have obvious economic benefits and popularization and application values.

Description

technical field [0001] The invention relates to an ecological environment material, that is, the comprehensive utilization of solid waste, and more specifically to a raw material formula and a preparation method for preparing magnesium-aluminum spinel materials by utilizing waste activated alumina. Background technique [0002] Magnesium aluminum spinel (MA) is MgO-Al 2 o 3 The only stable binary compound in the system is a ceramic material with high melting point, small thermal expansion coefficient, low thermal conductivity, good thermal shock stability, and strong alkali corrosion resistance. It is widely used in metallurgy, chemistry, and semiconductors. , laser, aerospace, military, atomic energy and other fields. The conventional synthesis method is to use industrial alumina as the main raw material, and the conventional synthesis method is to use industrial alumina as the main raw material, and the raw material cost is high. Activated alumina is widely used as a ca...

Claims

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Application Information

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IPC IPC(8): C04B35/443C04B35/622C04B35/66B09B3/00
Inventor 阮玉忠陈奇俤
Owner FUZHOU UNIVERSITY
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