Method for producing aluminum chloride by using fly ash

A technology of aluminum trichloride and fly ash, applied in the direction of aluminum chloride, aluminum halide, etc., can solve the problem of high cost, achieve the effects of reducing environmental pressure, improving comprehensive economic benefits, and reducing production costs

Inactive Publication Date: 2012-06-13
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the cost of producing anhydrous aluminum trichloride with high-purity aluminum as r

Method used

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  • Method for producing aluminum chloride by using fly ash
  • Method for producing aluminum chloride by using fly ash
  • Method for producing aluminum chloride by using fly ash

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Experimental program
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Effect test

Embodiment 1

[0024] Fly ash (Al 2 o 3 53%, SiO 2 35%, Fe 2 o 3 2.0%, TiO 2 1.9%) mixed evenly with graphite powder, pressed balls, dried, chlorinated with chlorine gas for 30min at 1300°C in a fixed bed chlorination furnace, Al 2 o 3 Chlorination rate 95.6%, SiO 2 Chlorination rate 88.6%, Fe 2 o 3 Chlorination rate 97.7%, TiO 2 The chlorination rate is 95.3%, and the process chlorine utilization rate is 80%. The reaction product is cooled and separated into FeCl 3 , AlCl 3 , TiCl 4 、SiCl 4 Two groups, FeCl 3 , AlCl 3 After the mixture is heated to 480°C, it is added to a reduction furnace with iron chips for primary reduction. The temperature of the furnace is 450°C. The gas from the first reduction furnace enters the second reduction furnace with aluminum chips. The temperature of the furnace is At 400°C, AlCl with a purity of 99.6% was obtained 3 . TiCl 4 、SiCl 4 The mixture of SiCl with a purity greater than 99.90% is obtained after rectification 4 .

Embodiment 2

[0026] With fly ash (Al 2 o 3 38%, SiO 2 46%, Fe 2 o 3 6.5%, TiO 2 2.1%) as raw material, first remove iron by dry magnetic separation, 68% iron is removed during the iron removal process, Al 2 o 3 The loss rate is 5.3%. After iron removal, the fly ash and charcoal are mixed and dried, and the mixed material is chlorinated in a molten salt chlorination furnace at 750°C, and the process Al 2 o 3 Chlorination rate 92.5%, SiO 2 Chlorination rate 85.3%, Fe 2 o 3 Chlorination rate 99.8%, TiO 2 The chlorination rate is 95.2%, and the utilization rate of chlorine gas is 95%. The reaction product is cooled and separated into FeCl 3 , AlCl 3 , TiCl 4 、SiCl 4 Two groups, FeCl 3 , AlCl 3 After the mixture is heated to 400°C, it is added to a reduction furnace with iron chips for primary reduction. The temperature of the furnace is 550°C. The gas from the first reduction furnace enters the second reduction furnace with aluminum chips. The temperature of the furnace ...

Embodiment 3

[0028] Using fly ash as raw material (Al 2 o 3 49%, SiO 2 38%, Fe 2 o 3 2.1%, TiO 2 1.7%), first dry magnetic separation iron removal, 65% iron was removed during the iron removal process, Al 2 o 3 The loss rate is 5.0%. The fly ash after iron removal is added to the fluidized bed furnace in CO and Cl 2 Chlorination at 500°C in the atmosphere, process Al 2 o 3 Chlorination rate 78.1%, SiO 2 Chlorination rate 60.9%, Fe 2 o 3 Chlorination rate 88.6%, TiO 2 The chlorination rate is 81.5%, and the utilization rate of chlorine gas is 91%. The reaction product is cooled and separated into FeCl 3 , AlCl 3 , TiCl 4 、SiCl 4 Two groups, FeCl 3 , AlCl 3After the mixture is heated to 540°C, it is sent to a reduction furnace with iron chips for primary reduction. The temperature of the furnace is 600°C. The gas from the first reduction furnace enters the second reduction furnace with aluminum chips. The temperature of the furnace is 600°C. at 450°C to obtain AlCl w...

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Abstract

The invention discloses a method for producing aluminum chloride by using fly ash, and relates to a comprehensive utilization method for fly ash. The method is characterized in that the fly ash is adopted as the raw material; a chlorinating agent and a reducing agent are adopted to chlorinate aluminum in the fly ash into the aluminum chloride at a temperature of 500-1300 DEG C, and silicon, iron, titanium and other elements are partially chlorinated into the corresponding chlorides; the chlorinated gaseous mixing product is subjected to step-by-step cooling, wherein ferric chloride and aluminum chloride are condensed from the gaseous mixing product, and then silicon tetrachloride and titanium tetrachloride are condensed from the gaseous mixing product; the tail gas is treated and exhausted; the solid mixture comprising the ferric chloride and the aluminum chloride is heated into the gaseous mixture, and the resulting gaseous mixture is sequentially subjected to reduction reactions with scrap iron and scrap aluminum; the reduced gas is cooled to obtain the purified anhydrous aluminum chloride. With the method for producing the aluminum chloride by using the fly ash, the production cost of the anhydrous aluminum chloride can be effectively reduced, the fly ash is effectively utilized, the environment pressure is reduced, and the comprehensive economic benefits are improved.

Description

technical field [0001] A method for producing aluminum trichloride from fly ash relates to a comprehensive utilization method of fly ash. Background technique [0002] Anhydrous aluminum trichloride can be used as a catalyst and detergent for organic synthesis, and can be used in industries such as medicine, pesticides, dyes, spices, metallurgy, plastics, and lubricating oil. At present, most anhydrous aluminum chloride production enterprises use metal aluminum as raw material. After preheating the treated high-purity aluminum, it is put into a closed chlorination reaction furnace. After the reaction, anhydrous aluminum trichloride is generated, and the generated aluminum trichloride enters the condenser and is captured to obtain the product anhydrous aluminum trichloride. The disadvantage of this process is that high-purity aluminum is used as raw material, and the cost of anhydrous aluminum trichloride produced is relatively high. [0003] "Handbook of Inorganic Salt Ind...

Claims

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Application Information

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IPC IPC(8): C01F7/56
Inventor 李旺兴杨建红齐利娟李昌林张志斌周云峰刘彬
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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