Formula and low-temperature manufacturing method of a high-purity alumina hollow sphere product

A technology of alumina hollow spheres and high-purity alumina, applied in chemical instruments and methods, heat exchange materials, etc., can solve the problems of not meeting the requirements of high temperature use, reducing the service life of firing equipment, and not saving energy in the manufacturing process. Achieve good heat insulation effect, improve service life, and use high temperature

Active Publication Date: 2012-02-01
CHANGXING KEAO POTTERY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] High-purity alumina hollow sphere products have an alumina content of more than 99%, and there is no liquid phase in the sintering process. The main sintering mechanism is solid-phase diffusion and mass transfer. The sintering temperature is high, reaching 1700-1800 ° C, and it must It takes 8-10 hours of heat preservation in the high temperature stage to make it sinter, which wastes a lot of energy, and the service life of the firing equipment is greatly reduced. Although it is an energy-saving material, its manufacturing process is not energy-saving and uneconomical.
Some researchers reduce the sintering temperature of alumina hollow sphere products by introducing siliceous materials to form reaction sintering and introducing low-melting materials to form liquid phase sintering, but the drawback is that the service temperature of the products drops sharply, which cannot meet the high temperature requirements. Requirements

Method used

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  • Formula and low-temperature manufacturing method of a high-purity alumina hollow sphere product
  • Formula and low-temperature manufacturing method of a high-purity alumina hollow sphere product
  • Formula and low-temperature manufacturing method of a high-purity alumina hollow sphere product

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Effect test

Embodiment 1

[0016] Example 1: Using the production process and technical scheme described in the present invention, the oxidation content of the alumina hollow spheres is 99.2%, the particle size is 0.2-4mm, and the natural bulk density is 0.78g / cm 3 aluminum; alumina micropowder alumina content is 99.5%, the particle size is 30μm; superfine alumina micropowder alumina content is 99.4%, the particle size is 0.96μm; aluminum sol binder colloidal particle diameter distribution is 5 ~ 30nm ; The concentration of lignosulfonate aqueous solution is 30%. The materials are uniformly mixed by a high-speed mixer according to the proportion, put into the mold cavity, formed by vibration and pressure, fully dried and then fired to produce high-purity alumina hollow ball products. The material of embodiment 1 and comparative example 1 is shown in the following table according to proportioning, firing system and product performance:

[0017]

[0018]

Embodiment 2

[0019] Example 2: Using the production process and technical scheme described in the present invention, the oxidation content of the alumina hollow spheres is 99.1%, the particle size is 0.2-3mm, and the natural bulk density is 0.86g / cm 3 aluminum; alumina micropowder alumina content is 99.3%, medium particle size is 31μm; superfine alumina micropowder alumina content is 99.4%, medium particle size is 0.71μm; aluminum sol binder colloidal particle diameter distribution is 5-25nm ; The concentration of lignosulfonate aqueous solution is 30%. The materials are uniformly mixed by a high-speed mixer according to the proportion, put into the mold cavity, formed by vibration and pressure, fully dried and then fired to produce high-purity alumina hollow ball products. The material of embodiment 2 and comparative example 2 is shown in the following table according to proportioning, firing system and product performance:

[0020]

Embodiment 3

[0021] Example 3: Using the production process and technical scheme described in the present invention, the oxidation content of the alumina hollow spheres is 99.3%, the particle size is 0.2-5mm, and the natural bulk density is 0.69g / cm 3 aluminum; alumina micropowder alumina content is 99.5%, medium particle size is 30μm; superfine alumina micropowder alumina content is 99.4%, medium particle size is 1.21μm; aluminum sol binder colloidal particle diameter distribution is 5-30nm ; The concentration of lignosulfonate aqueous solution is 30%; the concentration of polyvinyl alcohol aqueous solution is 6%. The materials are uniformly mixed by a high-speed mixer according to the proportion, put into the mold cavity, formed by vibration and pressure, fully dried and then fired to produce high-purity alumina hollow ball products. The material of embodiment 3 and comparative example 3 is shown in the following table according to proportioning, firing system and product performance:

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Abstract

The invention discloses a formula of high-purity alumina hollow sphere products and a low-temperature manufacturing method. The formula includes alumina hollow sphere aggregate, alumina micropowder matrix, superfine alumina micropowder additive, and aluminum sol binder. The low-temperature manufacturing method is as follows: first, the materials formulated according to the formula are uniformly mixed by a high-speed mixer, then put into a mold cavity and formed by vibration and pressure, and finally fully dried and kept at a temperature of 1550-1610°C High-purity alumina hollow sphere products are fired in 5 to 10 hours. The present invention introduces superfine alumina micropowder and aluminum sol into the high-purity alumina hollow sphere product, and utilizes the joint effect of ultrafine alumina micropowder and alumina sol to generate activated alumina after high-temperature dehydration to increase the driving force of sintering, making it It can be fired at a temperature of 1550-1610°C for 5-10 hours, so the firing temperature is low, and the holding temperature is low and the time is short.

Description

technical field [0001] The invention relates to a formula of a high-purity alumina hollow sphere product for a working layer or an insulating layer of a high-temperature kiln and a manufacturing method thereof. Background technique [0002] High-purity alumina hollow sphere products are 60% smaller in volume density and 70% smaller in thermal conductivity than ordinary corundum bricks. They have excellent heat insulation performance, good fire resistance and high strength, and can be used as high temperature and high temperature thermal equipment. The working lining can also be used as thermal insulation material, and it can be used at a temperature of 1800°C for a long time, so that the high-temperature kiln lining can achieve good results in energy saving, consumption reduction and emission reduction. [0003] High-purity alumina hollow sphere products have an alumina content of more than 99%, and there is no liquid phase in the sintering process. The main sintering mechan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/14C04B35/10C04B35/66C04B35/622C04B35/64
Inventor 冯维银
Owner CHANGXING KEAO POTTERY IND
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