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Preparation method of anhydrous aluminum chloride

A technology of anhydrous aluminum chloride and aluminum ore, which is applied in the direction of aluminum chloride and aluminum halide, can solve the problems of complex anhydrous aluminum chloride process, etc., and achieve easy industrial large-scale production, easy-to-obtain raw materials, and low-cost raw materials Effect

Active Publication Date: 2014-07-23
GUIYANG AL-MG DESIGN & RES INST
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Problems solved by technology

The feature of alumina powder method is that the price of raw material alumina is relatively low, but the process of obtaining anhydrous aluminum chloride is relatively complicated

Method used

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  • Preparation method of anhydrous aluminum chloride
  • Preparation method of anhydrous aluminum chloride
  • Preparation method of anhydrous aluminum chloride

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Embodiment Construction

[0033] The present invention will be described in further detail below in conjunction with the examples, but not as a limitation to the present invention.

[0034] A method for preparing anhydrous aluminum chloride, using fly ash (containing more than 25% of the mass fraction of alumina) or aluminous ore (such as bauxite, coal gangue, etc. containing more than 25% of the mass fraction of alumina) as raw materials, The aluminum sulfate solution is obtained by leaching with sulfuric acid, and after concentration and crystallization, aluminum sulfate crystals are obtained; the aluminum sulfate crystals are preheated at a temperature higher than 80°C for more than 30 minutes to remove crystal water to obtain aluminum sulfate. Mix aluminum sulfate with solid carbon (petroleum coke, activated carbon, calcined coke, charcoal or coal coke, etc.) and use a quantitative screw feeder to make the molar ratio of solid carbon to aluminum sulfate greater than 3.5 and then add the mixture at a...

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Abstract

The invention discloses a preparation method of anhydrous aluminum chloride; and the method is as follows: using fly ash or aluminum ore with more than 25% of alumina as a raw material for leaching with sulfuric acid to obtain an aluminum sulfate solution, then concentrating for crystallization to obtain an aluminum sulfate crystal, and preheating at above 80 DEG C for more than 30 minutes to remove crystal water to obtain aluminum sulfate; mixing the aluminum sulfate and solid carbon, then adding into a chlorination furnace with the temperature above 600 DEG C and the pressure of normal pressure or slightly negative pressure, letting in chlorine gas to produce an anhydrous aluminum chloride mixed gas with the mass percent content of more than 30%, and then refining and purifying to obtain the anhydrous aluminum chloride with a purity above 99%. Chlorination tail gas is washed with water, absorbed by use of an alkaline solution, and then discharged. The preparation method has the characteristics cheap and easily-available raw materials, less energy consumption, simple process, easiness in industrial large-scale production and the like. Because of the characteristics, the preparation method is especially suitable for the anhydrous aluminum chloride preparation in the production of metal aluminum by aluminum chloride molten salt electrolysis method.

Description

technical field [0001] The invention relates to a method for preparing anhydrous aluminum chloride, in particular to a method for preparing anhydrous aluminum chloride by using aluminum ore with a mass fraction greater than 25%. Background technique [0002] Aluminum trichloride, molecular formula AlCl 3 , English name Aluminum trichloride, density 2.44, acid corrosive product hazard mark 20, anhydrous aluminum trichloride belongs to organic chemical products, is the main raw material for the preparation of dyes, and is widely used in the synthesis of catalysts, petroleum cracking, synthetic dyes, The preparation of rubber, medicine, detergent, spices, pesticides and organic aluminum compounds can also be used in metal smelting and wetting oil processing. [0003] In recent years, with the depletion of global bauxite resources, the production cost of anhydrous aluminum chloride has gradually decreased, and it is most likely to become the source of raw materials to replace a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/58
Inventor 席灿明周小淞
Owner GUIYANG AL-MG DESIGN & RES INST
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