Method for preparing and comprehensively utilizing metal aluminum through coal ash pellet chlorination electrolysis

A technology for fly ash and metal aluminum, applied in chemical instruments and methods, silicon compounds, non-metallic elements, etc., can solve the problems of inability to comprehensively utilize, long process, and high energy consumption, so as to improve resource utilization and reduce emissions. , the effect of high product purity

Inactive Publication Date: 2017-09-05
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] The purpose of the present invention is to provide a method for the preparation of metal aluminum by chlorination and electrolysis of fly ash pelletizing and its comprehensive utilization in view of the technical problems of long process, high energy consumption and inability to comprehensively utilize existing technologies. Preparation of alumina by chlorination and electrolysis of aluminum fly ash pellets: through batching and pelletizing; the pellets can be chlorinated, separated, and purified to obtain anhydrous aluminum chloride, silicon tet...

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  • Method for preparing and comprehensively utilizing metal aluminum through coal ash pellet chlorination electrolysis

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Embodiment 1

[0053] A method for preparing metal aluminum by chlorination and electrolysis of fly ash pellets and its comprehensive utilization, the process flow chart is as follows figure 1 As shown, it specifically includes the following steps:

[0054] (1) Ingredients:

[0055] Get alumina content and be 25%, the high-alumina fly ash that silicon oxide content is 54%, according to mass ratio, high-alumina fly ash: coking coal: kaolin=1: 0.2: 0.01 batching, mix uniformly, form mixed material, to Add the water glass of 1.0% of the total mass of the mixed material and the water of 2.0% of the total mass of the mixed material in the mixed material;

[0056] (2) Ball making:

[0057] Mix the mixed material, water glass and water evenly, make pellets to obtain pellets with a particle size of 5mm, and air-dry the pellets naturally for 10 hours;

[0058] (3) Pellet chlorination and separation:

[0059] After the pellets are heated and chlorinated by microwaves, a mixture of anhydrous alumin...

Embodiment 2

[0067] A method for preparing metal aluminum by chlorination and electrolysis of fly ash pellets and its comprehensive utilization, the process flow chart is as follows figure 1 As shown, it specifically includes the following steps:

[0068] (1) Ingredients:

[0069] Get alumina content and be 38%, the high-alumina fly ash that silicon oxide content is 41%, according to mass ratio, high-alumina fly ash: coking coal: kaolin=1: 0.2: 0.03 batching, mix uniformly, form mixed material, to Add the water glass of 1.8% of the total mass of the mixed material and the water of 4.6% of the total mass of the mixed material in the mixed material;

[0070] (2) Ball making:

[0071] Mix the mixed material, water glass and water evenly, make pellets to obtain pellets with a particle size of 16mm, and dry the pellets naturally for 22 hours;

[0072] (3) Pellet chlorination and separation:

[0073] After the pellets are heated and chlorinated by microwaves, a mixture of anhydrous aluminum ...

Embodiment 3

[0081] A method for preparing metal aluminum by chlorination and electrolysis of fly ash pellets and its comprehensive utilization, the process flow chart is as follows figure 1 As shown, it specifically includes the following steps:

[0082] (1) Ingredients:

[0083] Get alumina content and be 33%, the high-alumina fly ash that silicon oxide content is 47%, according to mass ratio, high-alumina fly ash: coking coal: kaolin=1: 0.4: 0.02 batching, mix uniformly, form mixed material, to Add the water glass of 1.4% of the total mass of the mixed material and the water of 2.6% of the total mass of the mixed material in the mixed material;

[0084] (2) Ball making:

[0085] Mix the mixed material, water glass and water evenly, pelletize to obtain pellets with a particle size of 10mm, and air-dry the pellets naturally for 14 hours;

[0086] (3) Pellet chlorination and separation:

[0087] After the pellets are heated and chlorinated by microwaves, a mixture of anhydrous aluminum...

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Abstract

The invention discloses a method for preparing and comprehensively utilizing metal aluminum through coal ash pellet chlorination electrolysis. The method comprises the following steps: uniformly mixing coal ash, a carbon source and kaolin in a mass ratio of 1:(2-6):(0.05-0.3) so as to form a mixed material; adding a binding agent which accounts for 1.0-2.0% of the total mass of the mixed material and water which accounts for 2.0-5.0% of the total mass of the mixed material into the mixed material; uniformly mixing, pelletizing, and drying in air; performing chlorination and separation on pellets so as to respectively obtain anhydrous aluminum chloride, silicon tetrachloride and gallium chloride; directly electrolyzing the anhydrous aluminum chloride so as to obtain the metal aluminum and chlorine; feeding back the chlorine into a chlorination procedure; and further purifying the silicon tetrachloride, thereby obtaining polycrystalline silicon and zinc chloride. The method disclosed by the invention is low in cost, cheap and easy in raw material obtaining, complete in chlorination reaction through pelletization and chlorination, simple in operation process and high in electrolysis automation degree, the prepared metal aluminum is relatively high in purity, and raw materials such as chlorine and zinc can be recycled.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of industrial solid waste reuse, and in particular relates to a method for preparing metallic aluminum by chlorination and electrolysis of fly ash pellets and its comprehensive utilization. [0003] Background technique: [0004] Fly ash is a solid waste after coal combustion. The annual discharge of fly ash from coal-fired thermal power plants is nearly 400 million tons, and there are many oxides (Al 2 o 3 , SiO 2 , Fe 2 o 3 , K 2 O, Na 2 O, TiO 2 , CaO, MgO), in which the alumina content is equivalent to that in my country's medium and low-grade bauxite, and high-alumina fly ash is a potential resource that can replace bauxite in my country's alumina industry. Fly ash is the main source of suspended particulate matter, causing regional air pollution and endangering human health. [0005] High-alumina fly ash refers to fly ash with an alumina content greater than 37%. Its source is high-alumi...

Claims

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Application Information

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IPC IPC(8): C01B33/033C25C3/06C01G15/00
CPCC01B33/033C01G15/00C25C3/06
Inventor 张廷安豆志河吕国志刘燕王龙牛丽萍赵秋月傅大学张伟光
Owner NORTHEASTERN UNIV
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