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Aluminium oxide preparation and comprehensive utilization method through chlorination and electrolysis of fly ash

A technology of fly ash and alumina, applied in chemical instruments and methods, aluminate/alumina/aluminum hydroxide purification, electrolysis process, etc., can solve the problems of long process, high energy consumption, inability to comprehensively utilize, etc. Achieve the effect of reducing emissions, high product purity, and improving resource utilization

Inactive Publication Date: 2017-09-26
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] 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 in view of the technical problems of long process, high energy consumption and inability to comprehensively utilize existing technology. Through chemical purification and separation, the products of anhydrous aluminum chloride, silicon tetrachloride and gallium chloride can be obtained respectively, and the aluminum oxide in the fly ash can be recovered effectively while the recycling of hydrogen and chlorine can be realized.

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  • Aluminium oxide preparation and comprehensive utilization method through chlorination and electrolysis of fly ash

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Embodiment 1

[0048] A method for preparing alumina by chlorination and electrolysis of fly ash and its comprehensive utilization, the process flow chart is as follows figure 1 As shown, it specifically includes the following steps:

[0049] (1) Fly ash chlorination separation:

[0050] Take high-alumina fly ash with 25% alumina content and 55% silica content, add carbon to the high-alumina fly ash, mix it, pass chlorine gas, and carry out chlorination reaction by microwave heating, and the reaction temperature is 600°C Wherein, the addition amount is by mass ratio, high-aluminum fly ash: carbon=1: 0.2, after the chlorination reaction, adopt rectifying device, according to the difference of each material boiling point, different condensation temperatures are set, separate, obtain anhydrous chlorine respectively Aluminum chloride, silicon tetrachloride and gallium chloride, while generating tail gas and washing it with alkali solution; among them, the separated gallium chloride is enriched ...

Embodiment 2

[0062] A method for preparing alumina by chlorination and electrolysis of fly ash and its comprehensive utilization, the process flow chart is as follows figure 1 As shown, it specifically includes the following steps:

[0063] (1) Fly ash chlorination separation:

[0064] Take high-alumina fly ash with an alumina content of 37% and a silica content of 40%, add carbon to the high-alumina fly ash and mix it, then pass in chlorine gas, and carry out chlorination reaction by microwave heating, and the reaction temperature is 680°C Wherein, the amount of addition is by mass ratio, high aluminum fly ash: carbon=1: 0.4, after the chlorination reaction, adopt rectification device, according to the difference of each material boiling point, set different condensation temperature, separate, obtain anhydrous chlorine respectively Aluminum chloride, silicon tetrachloride and gallium chloride, while generating tail gas and washing it with alkali solution; among them, the separated galliu...

Embodiment 3

[0076] A method for preparing alumina by chlorination and electrolysis of fly ash and its comprehensive utilization, the process flow chart is as follows figure 1 As shown, it specifically includes the following steps:

[0077] (1) Fly ash chlorination separation:

[0078] Take high-alumina fly ash with an alumina content of 28% and a silica content of 52%, add carbon to the high-alumina fly ash for mixing, then pass in chlorine gas, and carry out chlorination reaction by microwave heating at a reaction temperature of 740°C Wherein, the addition amount is by mass ratio, high-alumina fly ash: carbon=1: 0.3, after the chlorination reaction, adopt rectifying device, according to the difference of each material boiling point, different condensation temperatures are set, separate, obtain anhydrous chlorine respectively Aluminum chloride, silicon tetrachloride and gallium chloride, while generating tail gas and washing it with alkali solution; among them, the separated gallium chlo...

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Abstract

An aluminium oxide preparation and comprehensive utilization method through chlorination and electrolysis of fly ash comprises the following steps: chloridizing and separating fly ash to obtain anhydrous aluminium chloride, silicon tetrachloride and gallium chloride; converting anhydrous aluminium chloride into an aluminium chloride water solution; controlling the voltage and the current density, and electrolyzing the aluminium chloride water solution to obtain aluminium hydroxide, hydrogen and chlorine; returning chlorine generated by electrolysis to a chlorination section; roasting aluminium hydroxide to obtain metallurgical-grade / chemical aluminium oxide; and performing distillation purification on silicon tetrachloride to generate polycrystalline silicon and zinc chloride. The aluminium oxide preparation and comprehensive utilization method is low in cost, cheap and easily accessible in raw material, simple in operation process, high in degree of automation and high in product purity, and the adopted raw materials, zinc, chlorine and the like, can be recycled.

Description

Technical field: [0001] 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 and its comprehensive utilization. Background technique: [0002] Fly ash is the fine ash collected from the flue gas after coal combustion, and is the main solid waste discharged from coal-fired power plants. The main oxide composition of fly ash in thermal power plants in my country is: SiO 2 、Al 2 o 3 , FeO, Fe 2 o 3 , CaO, TiO 2 Wait. Fly ash is one of the largest industrial wastes in my country. With the development of the power industry, the discharge of fly ash from coal-fired power plants is increasing year by year. If a large amount of fly ash is not treated, it will generate dust and pollute the atmosphere; if it is discharged into the water system, it will cause river silting, and the toxic chemicals in it will also cause harm to human bodies and organism...

Claims

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Application Information

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IPC IPC(8): C01F7/46C01B33/033C01G15/00C25B1/26C25B1/02C25C1/16
CPCC01B33/033C01F7/46C01G15/00C25B1/02C25B1/26C25C1/16Y02P10/20
Inventor 张廷安吕国志豆志河刘燕王龙牛丽萍赵秋月傅大学张伟光
Owner NORTHEASTERN UNIV
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