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

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Method used

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Examples

Experimental program
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Effect test

Example Embodiment

[0018] Example 1

[0019] The weight ratio of the raw material formula in this example: waste activated alumina is 50% by weight, and basic magnesium carbonate is 50% by weight. Weigh the two raw materials according to the formula and place them in a ball mill for wet grinding for 24 hours. The ground slurry is filtered, dehydrated, dried and crushed. The resulting grinding material is mixed with 6wt% water in the grinding material. After the materials are uniformly mixed, the mixed materials are pressed into molding; the shaped billets are dried at 100°C for 24 hours, and the dry billets are placed in a kiln for reaction and sintering at 1410°C. After holding for 3 hours, they are cooled to room temperature to obtain the magnesium aluminum spinel material. The content of magnesium-aluminum spinel is 91.5wt%, the flexural strength is 65Mpa, and the bulk density is 2.56g / cm 3 , The porosity is 26%.

Example Embodiment

[0020] Example 2

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

Example Embodiment

[0022] Example 3

[0023] The weight ratio of the raw material formula in this example: waste activated alumina is 54 wt%, and basic magnesium carbonate is 46 wt%. Weigh the two raw materials according to the formula and place them in a ball mill for wet grinding for 24 hours. The ground slurry is filtered, dehydrated, dried and crushed. The resulting grinding material is mixed with 6wt% water in the grinding material. After the material is uniformly mixed, the mixed material is pressed into a shape; the formed billet is dried at 100°C for 24 hours, and the dry billet is placed in a kiln at 1480°C for reaction sintering. After holding for 2 hours, it is cooled to room temperature to obtain a magnesium-aluminum spinel material. The magnesium-aluminum spinel content is 95.4wt% or more, 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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