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Preparation technique of aluminum hydroxide and aluminum oxide powder

A technology of aluminum oxide powder and aluminum hydroxide, which is applied in the preparation of aluminum hydroxide, the preparation of aluminum oxide/hydroxide, and the purification of aluminate/alumina/aluminum hydroxide, etc., can solve the difficulty of solid-liquid separation, filtration High resistance, high water content and other problems, to achieve the effect of simple raw materials, improved production efficiency and low cost

Active Publication Date: 2016-06-22
BEIJING SUN SILVER SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the aluminum hydroxide obtained by the aluminum salt precipitation method has the problems of difficult solid-liquid separation in large-scale production and the subsequent physical processing of the product agglomeration due to its initial precipitation in the form of jelly, high water content, and high filtration resistance. , these two issues hamper the application of their method in industry

Method used

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  • Preparation technique of aluminum hydroxide and aluminum oxide powder

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Effect test

Embodiment 1

[0031] Using industrial aluminum ingot as raw material, the consumption is about 0.53t / h, reacting with ammonium sulfate solution containing dilute sulfuric acid at 50°C to obtain aluminum ammonium sulfate solution. Then react with recycled ammonia water and additive ethanol in a 3000rpm stator-rotor reactor to obtain aluminum hydroxide slurry. After the slurry is separated from solid and liquid, the liquid is separated and purified by rectification and reused. After the solid is washed and dried at low temperature, the intermediate product of high-dispersion aluminum hydroxide powder can be obtained, with an output of about 1.65t / h. After high-temperature calcination, highly dispersed high-purity alumina products are obtained, with an output of about 1t / h.

Embodiment 2

[0033] Recover the catalyst supported by alumina, with a processing capacity of about 7.6t / h, and react with ammonium sulfate solution containing dilute sulfuric acid at 200°C to obtain aluminum ammonium sulfate solution. Then react with recycled ammonia water and additive ethylene glycol in a 1200rpm stator-rotor reactor to obtain aluminum hydroxide slurry. The aluminum hydroxide slurry is hydrothermally treated at 120°C and then separated from solid and liquid, and the obtained liquid is further rectified, separated and purified for reuse. After the solid obtained from solid-liquid separation is washed and dried at low temperature, the intermediate product, high-dispersion aluminum hydroxide powder, can be obtained, with a production capacity of about 13t / h. After calcining at high temperature, a highly dispersed alumina product is obtained, with an output of about 7t / h.

Embodiment 3

[0035] Recover the catalyst supported by alumina, with a processing capacity of about 16.2t / h, and react with ammonium sulfate solution containing dilute sulfuric acid at 160°C to obtain aluminum ammonium sulfate solution. Then react with recycled ammonia water and additive acetone in a 100rpm stator-rotor reactor to obtain aluminum hydroxide slurry. The aluminum hydroxide slurry is hydrothermally treated at 200°C and then separated from solid and liquid, and the obtained liquid is further rectified, separated and purified for reuse. After the solid obtained from solid-liquid separation is washed and dried at low temperature, the intermediate product, high-dispersion aluminum hydroxide powder, can be obtained, with an output of about 27t / h. After calcining at high temperature, a highly dispersed alumina product is obtained, with an output of about 15t / h.

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Abstract

The invention provides a preparation technique of aluminum hydroxide and aluminum oxide powder. The technique comprises the following steps: mixing an reaction intermediate aluminum ammonium sulfate and ammonia water in a stator-rotor reactor to react, carrying out hydrothermal treatment on the aluminum hydroxide slurry obtained by the reaction, carrying out solid-liquid separation, and treating the separated liquid, wherein most of the treated liquid can be recycled; and carrying out washing and drying on the separated solid to obtain a high-dispersity solid aluminum hydroxide material, and carrying out further roasting to obtain the aluminum oxide powder. The preparation technique provided by the invention has the advantages of low cost and no pollution. The produced aluminum hydroxide and aluminum oxide materials have the advantages of high dispersity, uniform particle size and high performance. The aluminum hydroxide can be used as an industrial additive, flame retardant or the like, and the aluminum oxide can be used as a catalyst or a raw material in electronic industry and ceramic industry.

Description

technical field [0001] The invention relates to a preparation process of aluminum hydroxide and alumina powder materials, which is characterized in that aluminum ammonia sulfate is used as a reaction intermediate, and the reaction equipment is a low-cost and pollution-free preparation process of a stator-rotor reactor, which belongs to the material and chemical industry field. Background technique [0002] Aluminum hydroxide is the largest and most widely used inorganic flame retardant additive. As a flame retardant, aluminum hydroxide can not only be flame retardant, but also prevent smoke, no dripping, and no toxic gas. Therefore, it has been widely used and its usage is increasing year by year. Often used in thermosetting plastics, thermoplastics, synthetic rubber, coatings and building materials industries for flame retardancy. [0003] The particle size of aluminum hydroxide directly affects its flame retardancy and filling properties. Increasing the surface area of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/34C01F7/42C01F7/46
CPCC01F7/34C01F7/42C01F7/46C01P2006/80
Inventor 宋云华刘欣李正林魏玉胜陈建铭李璐
Owner BEIJING SUN SILVER SCI & TECH
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