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Process for producing gama-alumina microsphere

A production method, alumina technology, applied in chemical instruments and methods, alumina/hydroxide preparation, inorganic chemistry, etc., can solve the problems of affecting the catalytic effect of microspheres, low pore volume of microspheres, increasing costs, etc., to achieve It is conducive to the promotion and application of industrialization, the production cost is low, and the effect of improving production efficiency and production capacity

Active Publication Date: 2005-06-29
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this production process, aluminum sol needs to be added during the pulping process to enhance the strength of the microspheres, and the amount of acid added is also large, which greatly increases the production cost, and the prepared microspheres have a low pore volume, which affects the catalytic performance of the microspheres. Effect

Method used

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  • Process for producing gama-alumina microsphere

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Effect test

Embodiment 1

[0020] The production method of gamma-alumina microspheres described in the present invention is formed by reacting pseudo-boehmite and nitric acid into a gel, formed by centrifugal spray drying, and then roasted, wherein:

[0021] The concentration of nitric acid used is controlled to be 65%, the addition of nitric acid accounts for 5% of the pseudo-boehmite weight, and the liquid-solid weight ratio of the gelling reaction is controlled to be 3;

[0022] The gelling temperature is 50±1°C, and the gelling time is 4 hours;

[0023] The firing temperature is 800±10°C, and the firing time is 2 hours.

Embodiment 2

[0025] The production method of gamma-alumina microspheres described in the present invention is formed by reacting pseudo-boehmite and nitric acid into a gel, formed by centrifugal spray drying, and then roasted, wherein:

[0026] The concentration of nitric acid used is controlled to be 60%, the addition of nitric acid accounts for 8% of the pseudo-boehmite weight, and the liquid-solid weight ratio of the gelling reaction is controlled to be 4;

[0027] The gelling temperature is 50±1°C, and the gelling time is 3 hours;

[0028] The firing temperature is 600±10°C, and the firing time is 3 hours.

Embodiment 3

[0030] The production method of gamma-alumina microspheres described in the present invention is formed by reacting pseudo-boehmite and nitric acid into a gel, formed by centrifugal spray drying, and then roasted, wherein:

[0031] The concentration of nitric acid used is controlled to be 70%, the addition of nitric acid accounts for 2% of the weight of pseudo-boehmite, and the liquid-solid weight ratio of the gelling reaction is controlled to be 5;

[0032] The gelling temperature is 60±2°C, and the gelling time is 2 hours;

[0033] The firing temperature is 800±15°C, and the firing time is 1.8 hours.

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Abstract

The invention relates to a method of producing ª†-alumina micro ball, using gibbsite and nitric acid to create into glue which is dried to be formed by centrifugal and then is produced by roasting. The method of producing ª†-alumina micro ball is simple and practical, with lost cost, increase the productive efficiency and productive capacity as well as satisfying the productive requirement ofª†-Al2O3 with different diameters, besides, it changes the volume, hard wearing of ª†-Al2O3 by adjust the quantity of gibbsite and acid, the products has good quality and it is benefit for spread and application in industry.

Description

technical field [0001] The invention relates to a production method of gamma-alumina microspheres, which belongs to the synthesis and preparation technology of compounds. Background technique [0002] γ-Al 2 o 3 With its own advantages, microspheres are widely used in the adsorbent and catalyst industries, especially in the catalyst industry, mainly in fluidized beds, so for γ-Al 2 o 3 Microspheres have more stringent requirements, and generally produced alumina microspheres are difficult to meet the requirements for use. [0003] The earliest, γ-Al 2 o 3 Microspheres are generally prepared by crushing large balls, and some equipment such as sugar coating machines are used to prepare microspheres. The method of crushing large balls is used to prepare microspheres. Due to the lack of particle size and sphericity, the wear is uneven. High, which directly affects the use effect, and the recovery rate of the finished product is relatively low. Now this production method is...

Claims

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Application Information

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IPC IPC(8): C01F7/24C01F7/30
Inventor 刘昌俊张少华王强樊慧芳殷晏国刘大军
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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