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Production technology for preparing boehmite microcrystalline powder

A production process and technology of microcrystalline powder, applied in the field of ceramic materials, can solve problems such as unfavorable industrial production, large fluctuations in target pressure, and difficulty in controlling the relationship between temperature and pressure, so as to achieve easy control of pressure, reduce production costs, and increase pressure. fast effect

Inactive Publication Date: 2018-07-13
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the heating process, the pressure is affected by various factors (such as solution filling degree, heating speed, etc.), which makes it difficult to control the relationship between temperature and pressure, and the target pressure fluctuates greatly, which is not conducive to industrial production

Method used

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  • Production technology for preparing boehmite microcrystalline powder
  • Production technology for preparing boehmite microcrystalline powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The raw material alumina trihydrate (D 50 =13μm) and distilled water according to 1Kg: 1.5L were mixed and poured into a high-pressure hydrothermal kettle. During the reaction process, the stirrer was always stirring at a speed of 800rpm, and steam was introduced to heat and pressurize until the pressure reached 2.0MPa. After holding for 3 hours, The slurry was taken out by pressure relief, and the resulting slurry was repeatedly suction-filtered and washed with distilled water until the filtrate was neutral, and the obtained product was dried at 200°C for 10 hours. The particle size of the boehmite microcrystalline powder prepared in this example was D 50 =2.97μm.

Embodiment 2

[0022] The raw material alumina trihydrate (D 50 =13μm) and distilled water according to 1Kg: 1.5L were mixed and poured into a high-pressure hydrothermal kettle. During the reaction process, the stirrer was always stirred at a speed of 800rpm, and steam was introduced to heat and pressurize until the pressure reached 2.5MPa. After holding for 3 hours, The slurry was taken out by pressure relief, and the resulting slurry was repeatedly suction-filtered and washed with distilled water until the filtrate was neutral, and the obtained product was dried at 200°C for 10 hours. The particle size of the boehmite microcrystalline powder prepared in this example was D 50 =3.66μm.

Embodiment 3

[0024] The raw material alumina trihydrate (D 50 =13μm) and distilled water according to 1Kg: 1.5L were mixed and poured into a high-pressure hydrothermal kettle. During the reaction process, the stirrer was always stirring at a speed of 800rpm, and steam was introduced to heat and pressurize until the pressure reached 3.0MPa. After holding for 3 hours, The slurry was taken out by pressure relief, and the resulting slurry was repeatedly suction-filtered and washed with distilled water until the filtrate was neutral, and the obtained product was dried at 200°C for 10 hours. The particle size of the boehmite microcrystalline powder prepared in this example was D 50 =3.87μm.

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Abstract

The invention discloses a production technology for preparing boehmite microcrystalline powder, and belongs to the field of ceramic materials. A high-pressure hydrothermal kettle is used, and cheap industrial alumina trihydrate with thick raw crystal (D50 is about 13 microns) is used as a raw material, and the boehmite microcrystalline powder is prepared through heating and pressurization with water vapor. The production technology comprises the following specific steps: firstly, slurrying the industrial alumina trihydrate powder with distilled water, and pouring into the high-pressure hydrothermal kettle with a stirring function, wherein the stirrer is always in a working state during a reaction; then, introducing the water vapor for heating and pressurization, preserving the pressure after a certain pressure is reached to obtain boehmite slurry; finally, naturally performing air cooling on the obtained slurry to room temperature, and then repeatedly performing suction filtration withdistilled water for washing till filtrate is neutral, and drying to obtain the boehmite microcrystalline powder which has small particle size (D50 is 2.97 microns) and diamond-shaped and uniformly distributed particles.

Description

technical field [0001] The invention belongs to the field of ceramic materials, and in particular relates to a raw material, a production process of boehmite microcrystalline powder. Background technique [0002] At present, in industrial production, alumina trihydrate is usually used as raw material to prepare boehmite microcrystalline powder through solid-state sintering, but there are many problems, such as the high-temperature calcination process, the calcination conditions are difficult to control, resulting in boehmite after high-temperature calcination The crystal grains are coarse and easy to form hard agglomerations; the product quality is difficult to improve and improve, which directly affects the performance of the product. In contrast, the hydrothermal method can not only effectively solve the problem of hard agglomeration during the calcination process, but also prepare boehmite microcrystalline powder with complete grain development and uniform dispersion. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
CPCC01F7/02C01P2002/72C01P2004/03C01P2004/61
Inventor 赵萍李卓辉刘继发庄会峰高敏
Owner QILU UNIV OF TECH
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