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A low-temperature preparation method of α-phase low-sodium alumina powder

A technology of sodium alumina and alumina, which is applied in the field of alumina powder preparation, can solve the problems of irregular alumina grain shape, high alumina calcination temperature, and high impurity content, achieve uniform particle size, and reduce sintering temperature , the effect of low calcination temperature

Active Publication Date: 2021-05-18
BEIJING UNIV OF POSTS & TELECOMM +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The low-temperature preparation method of α-phase low-sodium alumina powder provided by the present invention uses industrial alumina as raw material, and prepares low-sodium alumina powder (Na 2 The O content is 0.01-0.02%), which solves the problems of high production cost, high alumina calcination temperature, irregular alumina grain shape, uneven size, and high impurity content in the prior art.

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[0037] A low-temperature preparation method of α-phase low-sodium alumina powder, comprising the following steps:

[0038] (a) grinding a mixture of industrial alumina and water to obtain a refined alumina precursor slurry;

[0039] The present invention uses industrial alumina as raw material, and prepares low-sodium alumina powder (Na 2 O content is 0.01-0.02%). The method has the advantages of wide source of raw materials, simple production process, low production cost, low calcining temperature, no pollution to the environment and the like. With the help of ball milling and ultrasonic external force, the size of industrial alumina raw materials is reduced, the contact area between industrial alumina and liquid is increased, and a force is formed on the surface of industrial alumina particles, so that impurities such as sodium oxide are stripped from the surface of industrial alumina.

[0040] Wherein, in some preferred embodiments, the water is deionized water, and the m...

Embodiment 1

[0062] The preparation method of low-temperature α-phase low-sodium alumina powder of the present invention comprises the following steps:

[0063] (1) Mix industrial alumina and deionized water, the amount of deionized water added is equivalent to twice the weight of industrial alumina, make an alumina slurry with a concentration of 30%, and then put it into a planetary ball mill for ball milling . The medium of ball milling is zirconia ball, the diameter of zirconia ball is 0.5mm, and the grinding time is 3h.

[0064] (2) Add composite additives to the alumina precursor slurry prepared in step (1), the addition of hydrochloric acid in the composite additives is 0.03% of the weight of alumina, and the addition of aluminum fluoride is 0.1% of the weight of alumina , and prepare alumina precursor slurry.

[0065] (3) Put the alumina precursor slurry prepared in step (2) into a 35°C water bath, and stir for 60 minutes with a magnetic stirrer, the rotating speed of the magnetic...

Embodiment 2

[0073] The preparation method of low-temperature α-phase low-sodium alumina powder of the present invention comprises the following steps:

[0074] (1) Mix industrial alumina and deionized water, the amount of deionized water added is equivalent to twice the weight of industrial alumina, make an alumina slurry with a concentration of 30%, and then put it into a planetary ball mill for ball milling . The medium of ball milling is zirconia ball, the diameter of zirconia ball is 1mm, and the grinding time is 5h.

[0075] (2) Add composite additives to the alumina precursor slurry prepared in step (1), the addition of hydrochloric acid in the composite additives is 0.08% of the weight of alumina, and the addition of aluminum fluoride is 0.2% of the weight of alumina , and prepare alumina precursor slurry.

[0076] (3) Put the alumina precursor slurry prepared in step (2) into a 50°C water bath, and stir for 60 minutes with a magnetic stirrer, the rotating speed of the magnetic s...

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Abstract

The invention provides a low-temperature preparation method of α-phase low-sodium alumina powder. Using industrial alumina as raw material, low-sodium alumina powder (Na 2 The O content is 0.01-0.02%), which solves the problems of high production cost, high alumina calcination temperature, irregular shape, uneven size and high impurity content of alumina crystal grains in the prior art. The method has the advantages of wide source of raw materials, simple production process, low production cost, low calcining temperature, no pollution to the environment and the like. Moreover, with the help of ball milling and ultrasonic external force, the size of industrial alumina raw materials is reduced, the contact area between industrial alumina and liquid is increased, and a force is formed on the surface of industrial alumina particles, so that impurities such as sodium oxide are stripped from the surface of industrial alumina .

Description

technical field [0001] The invention relates to the technical field of preparation methods of alumina powder, in particular to a low-temperature preparation method of α-phase low-sodium alumina powder. Background technique [0002] α-phase alumina has good thermal and chemical stability, insoluble in water, insoluble in acid and alkali, fine particle size, high hardness and a series of excellent physical and chemical properties, and is widely used in the preparation of advanced refractory materials and transparent ceramics And battery separator materials and precision polishing materials and other products. In addition, with the development of science and technology, the application of α-phase alumina has also been rapidly expanded, and has extensively promoted the progress and development of related industries. However, compared with the internationally produced alumina products, the high-quality alumina currently produced still has disadvantages such as irregular grain sh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
CPCC01F7/021C01F7/023C01P2006/80
Inventor 毕科张家萌毕作振王莹雷鸣
Owner BEIJING UNIV OF POSTS & TELECOMM
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