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Granularity-controllable boehmite preparation method

A boehmite and particle size technology, applied in the field of boehmite preparation, can solve the problems of complex process, non-uniform morphology, wide particle size range, etc., and achieve the effects of high purity, uniform morphology and narrow particle size distribution

Inactive Publication Date: 2015-09-30
ANHUI ESTONE MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are many methods for preparing boehmite, but there are common characteristics such as complex process, severe agglomeration, wide particle size range, and uneven morphology.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Al(OH) 3 Mix with water to form a suspension with a concentration of 20-35% (mass fraction), adjust the pH to less than 5, treat it at a temperature of 170-200°C and a pressure of 1.5-1.7MPa for 24-40 hours, then filter and dry , and break up to obtain monodisperse boehmite, the monodisperse boehmite particle size is 0.1-0.8 micron.

Embodiment 2

[0023] Al(OH) 3 Mix with water to form a suspension with a concentration of 35-40% (mass fraction), adjust the pH to 5-7, treat at a temperature of 200-220°C and a pressure of 1.0-1.3MPa for 24-40 hours, then filter and dry , and break up to obtain monodisperse boehmite, the monodisperse boehmite particle size is 1-3 microns.

Embodiment 3

[0025] Al(OH) 3 Mix with water to form a suspension with a concentration of 40-60% (mass fraction), adjust the pH to 7-9, treat at a temperature of 220-240°C and a pressure of 1.0-1.3MPa for 24-40 hours, then filter and dry , and break up to obtain monodisperse boehmite, the monodisperse boehmite particle size is 3-10 microns.

[0026] See attached picture, figure 1 It is the particle size distribution diagram of the 0.6 micron high-purity boehmite prepared by the present invention. It can be seen from the figure that the nano-scale boehmite prepared by the present invention has the characteristics of narrow and uniform particle size distribution.

[0027] See attached picture, figure 2 and image 3 The scanning electron microscope (SEM) photo of the boehmite prepared for the present invention shows that the boehmite prepared by the present invention has a regular flaky structure, uniform particle size and good dispersion.

[0028] Table 1 Product parameters of boehmite o...

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Abstract

The invention provides a granularity-controllable boehmite preparation method and relates to the field of new materials. The granularity-controllable boehmite preparation method comprises the following steps: mixing Al(OH)3 and water to form a suspension with the concentration of 20-60% (by weight percent); adjusting the pH of the suspension to be 2-9; treating the suspension for 24-40 h at the temperature of 170-240 DEG C and the pressure of 1.0-1.7 MPa; filtering, drying and dispersing the treated suspension to obtain monodispersed boehmite with the granularity of 0.1-10 micrometers. The granularity-controllable boehmite preparation method is a wet preparation method of boehmite, and the prepared high-purity boehmite is narrow in grain distribution, uniform in appearance, controllable in granularity and favorable in dispersity. The granularity of boehmite can be adjusted through adjusting the pH value and the time of reaction and the granularities of the raw materials.

Description

Technical field [0001] The invention relates to the field of new materials, and specifically relates to a method for preparing boehmite with controllable particle size. Background technique [0002] Boehmite is also called boehmite. Its structural formula is AlO(0H) and its molecular formula is Al. 2 0 3 ·H 2 0. Boehmite is soluble in acid and alkali. This mineral is formed in acidic media and is mainly produced in sedimentary bauxite. It is characterized by symbiosis with siderite. It can be replaced by diaspore, gibbsite, kaolinite, etc., dehydrated and transformed into diaspore and alpha corundum, and hydrated into gibbsite. The flammable properties of synthetic resin are made suitable for use by the addition of flame retardants. Among many flame retardants, aluminum hydroxide (Al(0H) 3 ) is the most widely used due to its rich structural water, good flame retardant effect, excellent acid and alkali resistance, and low cost. [0003] Boehmite is an important flame-r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02B82Y30/00
Inventor 蒋学鑫王亚娟张超郭敬新
Owner ANHUI ESTONE MATERIAL TECH CO LTD
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