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Method for preparing aluminum oxide and co-producing hydrochloric acid from aluminum chloride hexahydrate through pyrolytic crystallization

A technology of aluminum chloride hexahydrate and by-product hydrochloric acid, which is applied in the direction of preparation of alumina/hydroxide, chlorine/hydrogen chloride, and preparation of chloride, etc., to achieve the effect of simple and clear main process, low production cost and single reactant

Active Publication Date: 2011-06-15
西安三瑞实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The current research and production status of using crystalline aluminum chloride hexahydrate to further produce downstream products is mostly the production of polyaluminum chloride, etc., and the production of alumina products that can be used in aluminum electrolysis is rarely reported in relevant literature

Method used

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  • Method for preparing aluminum oxide and co-producing hydrochloric acid from aluminum chloride hexahydrate through pyrolytic crystallization
  • Method for preparing aluminum oxide and co-producing hydrochloric acid from aluminum chloride hexahydrate through pyrolytic crystallization
  • Method for preparing aluminum oxide and co-producing hydrochloric acid from aluminum chloride hexahydrate through pyrolytic crystallization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Weigh 40kg of crystalline aluminum chloride hexahydrate and send it to the crystalline aluminum chloride hexahydrate silo through the conveying equipment. In the silo, the powder material is discharged into the belt scale through the valve and accurately measured, and then sent to the downpipe In the process, it is fed into the feeding screw of the crystalline aluminum chloride hexahydrate calciner through the feeder, and the feeding screw sends the material into the crystalline aluminum chloride hexahydrate calciner for calcination.

[0033] The raw material crystalline aluminum chloride hexahydrate has a bulk density of 0.819g / cm 3 , the particle size range is 0.6~1.2mm, and the main chemical composition is shown in the following table:

[0034] components

AlCl 3 .6H 2 o

KCl

NaCl

CaCl 2 .2H 2 o

h 2 o

content

93～95％

0.05～0.1％

0.05～0.1％

0.1～0.5％

3～5％

[0035] (2) The heating method of the...

Embodiment 2

[0041](1) Weigh 40kg of crystalline aluminum chloride hexahydrate and send it to the crystalline aluminum chloride hexahydrate silo through the conveying equipment. In the silo, the powder material is discharged into the belt scale through the valve and accurately measured, and then sent to the downpipe In the process, it is fed into the feeding screw of the crystalline aluminum chloride hexahydrate calciner through the feeder, and the feeding screw sends the material into the crystalline aluminum chloride hexahydrate calciner for calcination.

[0042] The raw material crystalline aluminum chloride hexahydrate has a bulk density of 0.819g / cm 3 , the particle size range is 0.3 ~ 0.5mm, and the main chemical composition is shown in the following table:

[0043] components

AlCl 3 .6H 2 o

KCl

NaCl

CaCl 2 .2H 2 o

h 2 o

content

93～95％

0.05～0.1％

0.05～0.1％

0.1～0.5％

3～5％

[0044] (2) The heat-carrying high-t...

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Abstract

The invention provides a method for preparing aluminum oxide and co-producing hydrochloric acid from crystallized aluminum chloride hexahydrate through pyrolysis crystallization. The method comprises the following steps: sending crystallized aluminum chloride hexahydrate used as a raw material to a pyrolyzing furnace to perform intramolecular dehydration and thermal cracking reaction at 140-900 DEG C and generate the product-aluminum oxide, and using a tail gas treatment system to absorb pyrolytic tail gas and generate the hydrochloric acid byproduct. By adopting the method in the invention, the comprehensive utilization industrial chain of fly ash can be extended, the environmental pollution problem that a lot of fly ash is stored up can be solved, strategic metal resources can be effectively recycled and great economic benefits can be created. The technological process in the invention has the single reactant, concise and clear main process, adequate and stable raw material supply and low production cost; and the emission of three wastes reaches the standard completely, the method in the invention belongs to the comprehensive utilization project of resources and meets the national industrial policy.

Description

technical field [0001] The invention relates to a method for decomposing crystalline aluminum chloride hexahydrate at high temperature by calcining to obtain high-grade aluminum oxide and by-product hydrochloric acid. Background technique [0002] The molecular formula of crystalline aluminum chloride hexahydrate (or crystalline aluminum chloride, aluminum chloride hexahydrate) is AlCl 3 ·6H 2 O, a product obtained by concentrated crystallization of aluminum chloride aqueous solution, can be used as water treatment agent, foundry hardener, wood preservative, paper sizing precipitant, etc. In addition, crystalline aluminum chloride hexahydrate can also be used for wool refining , production of aluminum hydroxide gel, production of petroleum chlorination cracking catalyst monomer, production of polyaluminum chloride and pharmaceutical industry, etc. [0003] Comprehensive utilization of fly ash or coal gangue can recover the aluminum in the form of crystalline aluminum chlor...

Claims

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Application Information

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IPC IPC(8): C01F7/30C01B7/03
Inventor 何建祥魏超杨扬
Owner 西安三瑞实业有限公司
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