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

A technology for alumina and fly ash, which is applied in the field of fly ash pelletizing, chlorination electrolysis to prepare alumina and comprehensive utilization, can solve the problems of inability to comprehensively utilize, long process and high energy consumption, so as to improve resource utilization rate and reduce energy consumption. The effect of small emissions and high product purity

Active Publication Date: 2017-09-05
NORTHEASTERN UNIV
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Problems solved by technology

[0014] The purpose of the present invention is to provide a method for preparing alumina and its comprehensive utilization by chlorination and electrolysis of fly ash pelletizing in order to solve 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 tetrachloride, and gallium chloride products; chlorine Aluminum hydroxide s

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

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Embodiment 1

[0057] A method for preparing alumina and its comprehensive utilization by chlorination and electrolysis of fly ash pellets, the process flow chart is as follows figure 1 As shown, it specifically includes the following steps:

[0058] (1) Batching: get the high-alumina fly ash whose alumina content is 25%, and the silicon oxide content is 56%, according to the mass ratio, high-alumina fly ash: coking coal: kaolin=1: 0.2: 0.01 batching, mix evenly, Form a mixed material, add water glass of 1.0% of the total mass of the mixed material and 2.0% of the water of the total mass of the mixed material in the mixed material;

[0059] (2) Pelletizing: mix the mixed material, binder and water evenly, pelletize to obtain pellets with a particle size of 5 mm, and air-dry the pellets naturally for 10 hours;

[0060] (3) Pellet chlorination and separation: the pellets are chlorinated by microwave heating to form a mixture of anhydrous aluminum chloride, silicon tetrachloride and gallium ch...

Embodiment 2

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

[0068] (1) Batching: get the high-alumina fly ash whose alumina content is 36%, and the silicon oxide content is 40%, according to the mass ratio, high-alumina fly ash: coking coal: kaolin=1: 0.2: 0.05 ingredients, mix evenly, Form the mixed material, add the water glass of 1.7% of the total mass of the mixed material and the water of 4.3% of the total mass of the mixed material in the mixed material;

[0069] (2) Pelletizing: mix the mixed material, binder and water evenly, pelletize to obtain pellets with a particle size of 12 mm, and air-dry the pellets naturally for 16 hours;

[0070] (3) Pellet chlorination and separation: the pellets are chlorinated by microwave heating to form a mixture of anhydrous aluminum chloride, silicon tetrachloride and ...

Embodiment 3

[0077] A method for preparing alumina and its comprehensive utilization by chlorination and electrolysis of fly ash pellets, the process flow chart is as follows figure 1 As shown, it specifically includes the following steps:

[0078] (1) Batching: get the high-alumina fly ash whose alumina content is 30%, and the silicon oxide content is 48%, according to the mass ratio, high-alumina fly ash: coking coal: kaolin=1: 0.3: 0.04 batching, mix evenly, Form the mixed material, add the water glass of 1.6% of the total mass of the mixed material and the water of 4.0% of the total mass of the mixed material in the mixed material;

[0079] (2) Pelletizing: mix the mixed material, binder and water evenly, pelletize to obtain pellets with a particle size of 16 mm, and air-dry the pellets naturally for 20 hours;

[0080] (3) Pellet chlorination and separation: the pellets are chlorinated by microwave heating to form a mixture of anhydrous aluminum chloride, silicon tetrachloride and gal...

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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:(2-5):(0.1-0.5) so as to form a mixed material; adding a binding agent and water; pelletizing, and drying in air; performing chlorination, separation and purification so as to respectively obtain anhydrous aluminum chloride, silicon tetrachloride and gallium chloride; converting the anhydrous aluminum chloride into an aluminum chloride solution, controlling voltage and current density, implementing electrolysis so as to obtain aluminum hydroxide, hydrogen and chlorine, and feeding back the chlorine to a chlorination procedure; roasting the aluminum hydroxide so as to obtain metallurgy-level/chemical aluminum oxide; and purifying the silicon tetrachloride. 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, high in automation degree and high in product 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 alumina 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-alumina coal, w...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01B33/033C01G9/04C01G15/00C01G23/02C25B1/00C25B1/26
CPCC01B33/033C01F7/02C01G9/04C01G15/00C01G23/022C25B1/00C25B1/26
Inventor 张廷安豆志河刘燕吕国志王龙牛丽萍傅大学赵秋月张伟光
Owner NORTHEASTERN UNIV
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