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A process for producing al2o3 balls

A process and ball forming technology, which is applied in the field of Al2O3 ball production, can solve the problems of unsatisfactory and harsh raw material requirements, and achieve the effect of qualified product quality and wide application range

Active Publication Date: 2016-04-20
中铝山东有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above technical problems, the present invention provides a method for producing Al 2 o 3 The process of balls solves the problem of harsh requirements on raw materials and products that cannot meet the requirements of Al in industrial applications. 2 o 3 The question of the different needs of the ball

Method used

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  • A process for producing al2o3 balls

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Experimental program
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Effect test

Embodiment 1

[0025] In terms of molar ratio, 25.6 moles of dry gibbsite produced by Bayer process is used as aluminum-containing raw material, 0.25 moles of ammonium sulfate is used as grain control agent, and 5.12 moles of aluminum-containing hydrate (the crystal water is 0.56 moles) is used as orientation control agent , then add water and mix evenly, and adjust the pH value to about 3 through a pH regulator; stir the above-mentioned mixture at room temperature at 100 rpm for 20 minutes, then raise the temperature to 180°C and keep it warm for 5 hours at a speed of 100 rpm; Centrifugal spray drying molding: the air inlet temperature is lower than 250°C, the air outlet temperature is controlled at 80-85°C; the water content is controlled at 4-8%. After roasting, the roasting temperature is 500-900 ° C, and the roasting time is 2-5 hours, and the alumina ball product is made.

Embodiment 2

[0027] In terms of molar ratio, 15 moles of gibbsite dehydration product (rh-type alumina) produced by Bayer process is used as aluminum-containing raw material, 1.0 moles of sodium sulfate is used as grain control agent, and acetic acid is used as pH regulator. Control agent; add water and mix evenly, adjust the pH to about 4, stir the above mixture at room temperature at 100 rpm for 20 minutes, then heat up to 180°C and keep warm at 100 rpm at 200°C 2h, through centrifugal spray drying: the air inlet temperature is lower than 300-450℃, the air outlet temperature is controlled at 80-115℃; the water content is controlled at 4-8%. After roasting: the roasting temperature is 500-900°C, and the roasting time is 2-5h to make alumina ball products.

Embodiment 3

[0029] In terms of molar ratio, 20 moles of gibbsite dehydration product (γ-type alumina) produced by Bayer process is used as aluminum-containing raw material, and 0.6 moles of sodium sulfate and ammonium sulfate mixed salt is used as grain control agent. After adding water and mixing evenly, pass pH Regulators ammonia water and sodium hydroxide adjust the pH to about 11, stir the above mixture at room temperature at 100 rpm for 20 minutes, then raise the temperature to 180°C and keep warm at 200°C for 2 hours at a speed of 100 rpm. Formed by centrifugal spray drying: the temperature of the air inlet is lower than 250°C, the temperature of the air outlet is controlled at 80-85°C; the water content is controlled at 4-8%. After roasting: the roasting temperature is 500-900°C, and the roasting time is 2-5h to make alumina ball products.

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Abstract

The invention relates to a process for producing an Al2O3 ball. The process comprises the following steps: adding a pH value adjusting agent, a control agent and water into aluminum-containing raw materials to be reacted, uniformly mixing up at room temperature, stirring and pulping, keeping the temperature of the mixing pulp to be at 100-400 DEG C and stirring and pulping for 0.5-30 hours, balling and roasting. As a plurality of aluminum-containing raw materials can be used as production raw materials, the process is wide in application range, different market requirements can be met and the produced products are qualified only if the reagents or use amount of the reagents are changed without changing the production equipment or steps.

Description

technical field [0001] The present invention relates to Al 2 o 3 The field of ball production, specifically related to a production of Al 2 o 3 Ball craft. Background technique [0002] Alumina ball is a deep-processed product with excellent physical and chemical properties such as high strength, high hardness, small thermal expansion coefficient and wear resistance. It belongs to the active series of activated alumina, with high technical content and added value. Its particle size varies and is widely used. It is mainly used as adsorbent, desiccant, catalyst or carrier, etc. Its price is equivalent to the current industrial oxidation 6 to 15 times that of aluminum, and the market capacity is predicted to be in the range of millions to tens of millions of tons. [0003] A large number of preparation experiments of alumina peroxide balls have been carried out internationally, but they have not been able to realize industrial application on a large scale due to reasons su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
Inventor 于存贞温金德王延玲
Owner 中铝山东有限公司
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