Technology for preparing boehmite microcrystal powder only through adjusting pressure

A technology for adjusting pressure and boehmite, applied in inorganic chemistry, chemical instruments and methods, aluminum compounds, etc., can solve problems such as corrosion of equipment, unsuitability for industrial mass production, complicated operation, etc., to avoid pollution and shorten the reaction cycle , The effect of simple process

Inactive Publication Date: 2017-03-22
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can prepare boehmite with different shapes, it needs to add other additives, introduce new impurities, and adding inorganic acid and alkali will corrode the equipment, the operation is complicated, and it is not suitable for industrial mass production.

Method used

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  • Technology for preparing boehmite microcrystal powder only through adjusting pressure
  • Technology for preparing boehmite microcrystal powder only through adjusting pressure
  • Technology for preparing boehmite microcrystal powder only through adjusting pressure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 2.0kg alumina trihydrate powder (D 50 =13μm) and 4.0L of distilled water were added to a high-pressure hydrothermal kettle, stirred at a speed of 600rpm while heating, the temperature was raised to a pressure of 1.2MPa, and the pressure was maintained for 1.5h to obtain a boehmite slurry, which was taken out and cooled to room temperature naturally. Then use distilled water to filter and wash repeatedly until the filtrate pH=7, and finally dry the filtered product at 120°C for 12 hours to prepare the required boehmite microcrystalline powder. The boehmite microcrystal powder prepared in this example Granite size D 50 =3.42μm.

Embodiment 2

[0022] 2.0kg alumina trihydrate powder (D 50 =13μm) and 4.0L of distilled water were added to a high-pressure hydrothermal kettle, stirred at a speed of 600rpm while heating, the temperature was raised to a pressure of 1.4MPa, and the pressure was maintained for 1.5h to obtain a boehmite slurry, which was taken out and cooled to room temperature naturally. Then use distilled water to filter and wash repeatedly until the filtrate pH=7, and finally dry the filtered product at 120°C for 12 hours to prepare the required boehmite microcrystalline powder. The boehmite microcrystal powder prepared in this example Granite size D 50 =3.11 μm.

Embodiment 3

[0024] 2.0kg alumina trihydrate powder (D 50 =13μm) and 4.0L of distilled water were added to a high-pressure hydrothermal kettle, stirred at a speed of 600rpm while heating, the temperature was raised to a pressure of 1.6MPa, and the pressure was maintained for 1.5h to obtain a boehmite slurry, and the slurry was taken out and naturally cooled to room temperature, and then Repeated suction filtration and washing with distilled water until the filtrate pH = 7, and finally dried the product after suction filtration at 120°C for 12 hours to prepare the required boehmite microcrystal powder, the boehmite microcrystal powder prepared in this example Stone microcrystalline powder particle size D 50 =2.97μm.

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Abstract

The invention discloses a technology for preparing boehmite microcrystal powder only through adjusting the pressure, and belongs to the field of ceramic materials. The boehmite microcrystal powder is prepared from industrial alumina trihydrate with large original crystal (D50 = about 13 [mu]m) and low price by using a high-pressure hydrothermal kettle only through adjusting the pressure in the kettle, and products with superior other performances can be prepared from the boehmite microcrystal powder. The technology concretely comprises the following steps: pulpifying the industrial alumina trihydrate with distilled water, pouring the obtained slurry into the high-pressure hydrothermal kettle with a stirring function, stirring and heating the slurry, only adjusting the pressure in the kettle to prepare a boehmite slurry, carrying out air cooling on the obtained slurry to room temperature, carrying out repeated suction filtration and washing with distilled water until the pH value of obtained filtrate is 7, and drying the filtrate to obtain the boehmite microcrystasl powder with small granularity (D50 = about 3.5 [mu]m), uniform distribution and rhombic block-shaped profile.

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] Ultrafine alumina powder is an indispensable and important raw material in the production of modern ceramic materials. It has the characteristics of macroscopic quantum tunneling effect, surface effect, volume effect and quantum size effect of nanoparticles, so it shows the characteristics that conventional materials do not have. Optical, electrical, magnetic, thermal and mechanical properties. Alumina powder can be prepared by calcining boehmite, and it is of great significance to study and control the particle size of boehmite for the preparation of alumina powder. [0003] At present, in industrial production, alumina trihydrate is usually used as raw material to prepare boehmite powder by calcination, but there are still many problems. After high-temperature c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/44
CPCC01F7/447C01P2002/72C01P2004/03C01P2004/38C01P2004/61
Inventor 赵萍李卓辉李长刚高敏刘继发
Owner QILU UNIV OF TECH
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