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Method for making aluminum oxide by utilizing crystalline aluminum chloride

A technology for crystallizing aluminum chloride and aluminum chloride, which is applied in the preparation of alumina/hydroxide, etc., which can solve problems such as difficult high-purity alumina and increased impurity concentration, and achieve improved purity, reduced viscosity, and reduced energy consumption Effect

Active Publication Date: 2014-04-23
CHINA SHENHUA ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the concentration of the evaporation process, the impurity concentration in the solution that has been removed continues to increase, making it difficult to directly prepare high-purity alumina with higher added value.

Method used

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  • Method for making aluminum oxide by utilizing crystalline aluminum chloride
  • Method for making aluminum oxide by utilizing crystalline aluminum chloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Add the above-mentioned crystalline aluminum chloride A gradually to 200ml of hydrochloric acid solution with a concentration of 16.73wt%, the operating temperature is 20°C, and keep stirring until the added crystalline aluminum chloride A is no longer dissolved, so as to obtain a saturated solution of aluminum chloride. The remaining crystalline aluminum chloride A to be purified is added to the saturated solution in an amount of 4:1 according to the liquid-solid ratio (that is, the mass ratio of the saturated aluminum chloride solution to the crystalline aluminum chloride A to be purified, the same below), Stir continuously to make it reach the equilibrium of dissolution and crystallization, and the stirring time is 60min to carry out the first purification; solid-liquid separation, to obtain a purified aluminum chloride crystal B, control the water content of the purified aluminum chloride crystal B at 2wt%~3 Between %wt; add 32wt% to 33wt% concentrated hydrochloric a...

Embodiment 2

[0045] The experiment is the same as in Example 1, except that the operating temperature of the first purification in this embodiment is 50°C, the stirring time is 60min, and the purified aluminum chloride crystals are obtained after solid-liquid separation; the temperature of the second purification is 20°C , the stirring time was 60min, the secondary purified aluminum chloride crystals were obtained after solid-liquid separation, and calcined to obtain alumina D, whose main components are shown in Table 3.

Embodiment 3

[0047] The experiment is the same as in Example 2, except that the liquid-solid ratio of the first purification in this example is 6:1. The mass ratio of the concentrated hydrochloric acid added during the second purification to the crystalline aluminum chloride obtained from the first purification is 5:1. The main components of alumina E after calcination are shown in Table 3.

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Abstract

The invention discloses a method for making high-purity aluminum oxide by utilizing crystalline aluminum chloride. The crystalline aluminum chloride is the crystalline aluminum chloride in the production process of the aluminum oxide by a fly ash acid method. The method comprises the following steps: utilizing part of the crystalline aluminum chloride to prepare an HCl solution of saturated AlCl3, performing purification on part of the crystalline aluminum chloride to obtain primary purification aluminum chloride crystals, then utilizing concentrated hydrochloric acid to perform secondary purification on the primary purification aluminum chloride crystals, and then calcining and crushing the obtained aluminum chloride to obtain the aluminum oxide. According to the method disclosed by the invention, a small part of the aluminum chloride to be purified is consumed and a large part of the aluminum chloride is purified, so that the cost is saved; furthermore, the solution after purification can be recycled; and in addition, impurity removal is performed on the crystals in the two purification processes, the purity of the aluminum chloride crystals is improved, the crystals are of large particles, the sand-like aluminum oxide is obtained after calcination, and the product purity is more than 99.9%.

Description

technical field [0001] The invention relates to a method for preparing high-purity (purity greater than 99.9%) alumina, in particular to a method for preparing high-purity alumina by using crystalline aluminum chloride, an intermediate product in the aluminum extraction process of fly ash acid method, as a raw material. Background technique [0002] High-purity alumina is mainly used in many fields such as ceramics, refractory materials, aerospace, and catalyst carriers. At present, the preparation methods of high-purity alumina mainly include aluminum ammonium sulfate pyrolysis method, aluminum ammonium carbonate pyrolysis method, spray pyrolysis method, sol-gel method, etc. [0003] The aluminum ammonium sulfate pyrolysis method is to add ammonium sulfate to the aluminum sulfate solution to react to obtain ammonium alum, and then obtain ammonium alum with high purity after repeated recrystallization, and finally calcinate the ammonium alum to obtain alumina products. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/30
Inventor 郭昭华池君洲许立军陈东董宏范培育王丽萍吴永峰
Owner CHINA SHENHUA ENERGY CO LTD
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