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Preparation method of highly pure alumina

A high-purity alumina and alumina technology, applied in the purification of aluminate/alumina/aluminum hydroxide, etc., can solve the problems of complex process flow, serious environmental pollution and high production hazard, and achieve simple process flow and high production efficiency. Wide range of conditions, high purity effects

Inactive Publication Date: 2016-06-01
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The above-mentioned processes have the disadvantages of low production efficiency, poor controllability of the production process, long production cycle, difficulty in controlling the purity, serious environmental pollution, complicated process flow, and high production hazards; Most of the use of aluminum depends on imports

Method used

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  • Preparation method of highly pure alumina

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Experimental program
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Effect test

Embodiment 1

[0027] The raw materials of this embodiment are aluminum oxide with a purity of 99.991% and superior pure ammonia water with a concentration of 8%. Mix the above aluminum oxide and ammonia water according to the ratio of L / S (mL / g) to 18, and mix them evenly Put the slurry into a clean reaction kettle, slowly raise the temperature to 250°C, and keep it warm at 250°C for 7 hours. After the reaction, the slurry is separated from liquid to solid, and the obtained filter cake is washed 5 times with 80°C high-purity water according to the water-solid ratio of 15. Drying at ℃, the purity of the obtained product is 99.9993%.

Embodiment 2

[0029] The raw materials of this embodiment are alumina with a purity of 99.995% and superior pure ammonia water with a concentration of 3%. Mix the above alumina and ammonia water according to the ratio of L / S (mL / g) to 30, and mix them evenly Put the slurry into a clean reaction kettle, raise the temperature slowly to 200°C, and keep it warm at 200°C for 9 hours. After the reaction, the slurry is separated from liquid to solid. Drying at ℃, the purity of the obtained product is 99.9992%.

Embodiment 3

[0031] The raw materials of this embodiment are aluminum oxide with a purity of 99.95% and superior pure ammonia water with a concentration of 9%. Mix the above aluminum oxide and ammonia water according to the ratio of L / S (mL / g) to 40, and mix them evenly Put the slurry into a clean reaction kettle, slowly raise the temperature to 230°C, and keep it warm at 230°C for 20 hours. After the reaction, the slurry is separated from liquid to solid, and the obtained filter cake is washed 5 times with 95°C high-purity water according to the water-solid ratio of 15. Drying at ℃, the purity of the obtained product is 99.9991%.

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Abstract

The invention discloses a preparation method of highly pure alumina, belongs to the technical field of alumina preparation, and concretely relates to a method for preparing highly pure alumina powder with the purity of 99.999% or above from alumina with the purity of 99.95-99.995%. The method comprises the following steps: mixing a raw material alumina with a certain concentration of superior pure ammonia water according to a certain liquid / solid ratio, reacting above materials at 50-250DEG C for 0.5-20h, filtering the obtained material, washing the filtered material, and drying the washed material to obtain the highly pure alumina with the purity of 99.999% or above. The method allows the highly pure alumina to be prepared, and has the advantages of high product purity, simple process and low cost. The highly pure alumina prepared in the invention is suitable for the fields of laser crystals, transparent ceramics and LED sapphire long crystals.

Description

technical field [0001] The invention belongs to the technical field of alumina preparation. Specifically, the invention relates to a method for preparing high-purity alumina powder with a purity of 99.999% or more by using alumina with a purity of 99.95% to 99.995%. Background technique [0002] High-purity alumina generally refers to alumina with a purity above 99.999% (5N). High-purity alumina has incomparable optical properties, electrical properties, magnetic properties and thermal properties, so it is widely used in the field of high-tech materials and modern chemical industry. In terms of luminescent materials, it can be used as rare earth three-color fluorescent The main raw material of phosphor powder, long afterglow phosphor, PDP phosphor, and LED phosphor; in terms of transparent ceramics, it can be used as a fluorescent tube for high-pressure sodium lamps, and an electric programmable read-only memory window; in terms of single crystal, it can be used to make rubi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/46
Inventor 马淑花吕松青王晓辉郑诗礼
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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