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Method for preparing high-purity boehmite by dry method and high-purity boehmite

A boehmite, high-purity technology, applied in chemical instruments and methods, alumina/hydroxide preparation, inorganic chemistry, etc., can solve the problems of high residual metal impurities, lower boehmite purity, and more washing wastewater , to achieve the effect of reducing operating costs, improving product purity, and reducing raw material costs

Pending Publication Date: 2022-01-21
CHINA CHEM TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some use magnesium chloride as an additive, and the morphology of boehmite can be controlled by controlling the content of magnesium chloride in the raw material solution, but magnesium ions are introduced into the product, which ultimately reduces the purity of boehmite; Alkali metal salts are used as crystal form modifiers to adjust the boehmite crystal form, and flake or granular boehmite can be obtained; but these methods are complicated to operate, and use a large amount of alkali metal salts and alkalis, and there is a lot of washing wastewater, and The residual amount of metal impurities in the product is high, which often cannot meet the actual needs

Method used

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  • Method for preparing high-purity boehmite by dry method and high-purity boehmite
  • Method for preparing high-purity boehmite by dry method and high-purity boehmite
  • Method for preparing high-purity boehmite by dry method and high-purity boehmite

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Embodiment 1

[0048] The dry method described in the present embodiment prepares the method for high-purity boehmite, comprises the following steps:

[0049] S1. Mix 350g of aluminum hydroxide, 50g of gamma-alumina, and 20g of aluminum chloride hexahydrate uniformly with a particle size of 5 μm;

[0050] S2. Put the mixture obtained in step S1 into a 1L autoclave, heat up to 250°C at 4°C / min, and then keep the temperature for 48 hours. After the reaction, cool down, then filter and separate, wash the filter cake with deionized water, and put it in an oven Dry at 150°C to obtain high-purity granular boehmite.

[0051] Such as figure 1 Shown is the XRD figure of the high-purity granular boehmite that the present embodiment obtains; figure 2 Shown is the SEM picture of the high-purity granular boehmite obtained in this example.

Embodiment 2

[0053] The dry method described in the present embodiment prepares the method for high-purity boehmite, comprises the following steps:

[0054] S1. Mix 380g pseudo-boehmite, 20g fast powder removal, 20g aluminum nitrate nonahydrate, and 20g water; the water content is 4.55wt%;

[0055] S2. Put the mixture obtained in step S1 into a 1L autoclave, raise the temperature to 200°C at 5°C / min, and then keep the temperature for 24 hours. After the reaction, cool down, then filter and separate, wash the filter cake with deionized water, and put it in an oven Dry at 130°C to obtain high-purity parallelepiped boehmite.

[0056] Such as image 3 Shown is the SEM image of the high-purity parallelepiped boehmite obtained in this example.

Embodiment 3

[0058] The dry method described in the present embodiment prepares the method for high-purity boehmite, comprises the following steps:

[0059] S1. Mix 380g of aluminum hydroxide with a particle size of 5 μm, 20g of quick-release powder, 20g of aluminum isopropoxide, and 30g of water; the water content is 6.67wt%;

[0060] S2. Put the mixture obtained in step S1 into a 1L autoclave, heat up to 220°C at 6°C / min, and then keep the temperature for 32 hours. After the reaction, cool down, then filter and separate, wash the filter cake with deionized water, and put it in an oven Dry at 120°C to obtain high-purity flaky boehmite.

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Abstract

The invention provides a method for preparing high-purity boehmite by a dry method and high-purity boehmite, and the preparation method comprises the following steps: S1, mixing a first aluminum source, a second aluminum source, an aluminum salt additive or a solution of the aluminum salt additive, adding or not adding water, and controlling the total water content in the raw materials to be less than 15wt%, wherein the first aluminum source is one or a mixture of two of aluminum hydroxide and pseudo-boehmite, the second aluminum source is an aluminum oxide compound, and the aluminum salt additive is one or a mixture of two of inorganic aluminum salt and organic aluminum salt; S2, heating the mixture obtained in the step S1 to 170-250 DEG C in a high-pressure kettle, and then reacting for 4-60 hours to obtain the high-purity boehmite. The preparation method has the advantages of low energy consumption, low cost and easiness in operation, and the prepared boehmite is high in purity, regular in shape, high in crystallinity, adjustable in particle size and narrow in particle size distribution.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a dry method for preparing high-purity boehmite and the high-purity boehmite. Background technique [0002] Boehmite (γ-AlOOH, γ-Al 2 o 3 ·H 2 O), also known as boehmite, is a partially dehydrated aluminum hydroxide. The appearance of boehmite is a fine white crystal, which belongs to the orthorhombic crystal system and has a layered structure; in a single structure layer, oxygen ions (O 2- ) are arranged at the vertices of the octahedron in a cubic close-packed manner, aluminum ions (Al 3+ ) is located in the center of the octahedron, and the hydroxide (OH - ) is located on the surface of the layered structure, and the layers are connected by hydrogen bonds. In addition, boehmite has high thermal conductivity, good thermal stability, and low bulk density, and thermal decomposition will release water vapor, absorb a large amount of heat, and decompose Al ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/021C01F7/30C01F7/308C01F7/306C01F7/32
CPCC01F7/021C01F7/30C01F7/308C01F7/306C01F7/32C01P2004/62C01P2004/61C01P2006/80C01P2002/72C01P2004/03
Inventor 梁武洋刘中清邓兆敬赵峰
Owner CHINA CHEM TECH RES INST
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