Method for preparing aluminum oxide through hydrochloric acid leaching and two-stage electrolysis of bauxite and comprehensively utilizing aluminum oxide

A hydrochloric acid leaching and bauxite technology, applied in aluminum compounds, rare earth metal compounds, chemical instruments and methods, etc., can solve the problems of long process, high energy consumption, inability to comprehensively utilize, etc., to save a lot of costs and product purity. High, improve the effect of resource utilization

Active Publication Date: 2017-09-05
NORTHEASTERN UNIV
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  • Application Information

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Problems solved by technology

[0013] The purpose of the present invention is to solve the technical problems of long flow process, high energy consumption and inability to comprehensively utilize existing technologies. The present invention provides a method for preparing alumina by step-by-step electrolysis of bauxite hydrochloric acid leaching and its comprehensive utilization. By reacting bauxite with hydrochloric acid, the bauxite can be obtained by step-by-step leaching, solid-liquid separation, and purification to obtain ferric chloride mixed solution and aluminum chloride mixed solution. From the mixed solution of aluminum chloride and ferric chloride Separation and extraction of scandium chloride and gallium chloride, after purification, high-purity s

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  • Method for preparing aluminum oxide through hydrochloric acid leaching and two-stage electrolysis of bauxite and comprehensively utilizing aluminum oxide

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Embodiment 1

[0052] A kind of bauxite hydrochloric acid leaching step-by-step electrolytic preparation of alumina and its comprehensive utilization method, the process flow chart is as follows figure 1 As shown, it specifically includes the following steps:

[0053] (1) Mix bauxite trihydrate and hydrochloric acid with a mass concentration of 36% according to the solid mass and liquid volume ratio of 1:1, send it into the reactor and heat it to 50°C, the reaction time is 1h, and carry out solidification after the reaction cools down. Liquid separation and purification treatment, respectively to obtain aluminum chloride mixed solution and ferric chloride mixed solution;

[0054] (2) Separate and purify the aluminum chloride mixed solution and the ferric chloride mixed solution obtained in step (1) respectively to obtain scandium chloride with a purity of 98.5% and gallium chloride with a purity of 98.5%, and aqueous aluminum chloride and Ferric chloride aqueous solution;

[0055] (3) The ...

Embodiment 2

[0061] A kind of bauxite hydrochloric acid leaching step-by-step electrolytic preparation of alumina and its comprehensive utilization method, the process flow chart is as follows figure 1 As shown, it specifically includes the following steps:

[0062] (1) Mix bauxite and hydrochloric acid with a mass concentration of 5% according to the solid mass to liquid volume ratio of 1:20; mix them, send them into the reactor and heat them to 250°C, the reaction time is 10h, and the reaction is carried out after cooling down Solid-liquid separation and purification treatment to obtain aluminum chloride mixed solution and ferric chloride mixed solution respectively;

[0063] (2) Separate and purify the aluminum chloride mixed solution and the ferric chloride mixed solution obtained in step (1) respectively to obtain scandium chloride with a purity of 98.5% and gallium chloride with a purity of 98.5%, and aqueous aluminum chloride and Ferric chloride aqueous solution;

[0064] (3) The ...

Embodiment 3

[0070] A kind of bauxite hydrochloric acid leaching step-by-step electrolytic preparation of alumina and its comprehensive utilization method, the process flow chart is as follows figure 1 As shown, it specifically includes the following steps:

[0071] (1) Bauxite monohydrate and hydrochloric acid with a mass concentration of 36% are mixed according to the solid mass to liquid volume ratio of 1:5, and heated to 100°C in the reactor, and the reaction time is 3h, and solidification is carried out after the reaction cools down. Liquid separation and purification treatment, respectively to obtain aluminum chloride mixed solution and ferric chloride mixed solution;

[0072] (2) Separate and purify the aluminum chloride mixed solution and the ferric chloride mixed solution obtained in step (1) respectively to obtain scandium chloride with a purity of 98.5% and gallium chloride with a purity of 98.5%, and aqueous aluminum chloride and Ferric chloride aqueous solution;

[0073] (3)...

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Abstract

The invention relates to a method for preparing aluminum oxide through hydrochloric acid leaching and two-stage electrolysis of bauxite and comprehensively utilizing aluminum oxide. The method comprises the following steps: carrying out hydrochloric acid leaching, solid-liquid separation and purification on bauxite on bauxite, so as to obtain an iron chloride mixed solution and an aluminum chloride mixed solution; respectively separating and purifying the iron chloride mixed solution and the aluminum chloride mixed solution, so as to obtain scandium chloride, gallium chloride, an aluminum chloride water solution and an iron chloride water solution; setting electrolytic voltage and current density, and respectively carrying out two-stage electrolysis on the aluminum chloride water solution and the iron chloride water solution, so as to respectively obtain aluminum hydroxide, hydrogen and chlorine as well as iron hydroxide, hydrogen and chlorine; preparing a hydrochloric acid solution by using the generated hydrogen and chlorine, and returning the hydrochloric acid solution to a leaching stage for recycling; and roasting aluminum hydroxide, so as to obtain metallurgy level aluminum oxide or chemical aluminum oxide. Compared with a traditional acid method, the electrolysis method for recycling aluminum oxide in the bauxite and processing the bauxite has the advantages that the evaporation step and equipment, the concentration step and equipment are omitted, the operation is simplified, meanwhile, the cost is substantially lowered, and the product has relatively high purity.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of alumina production, and in particular relates to a step-by-step electrolytic preparation of alumina by hydrochloric acid leaching of bauxite and a comprehensive utilization method. [0003] Background technique: [0004] Three bauxites of gibbsite type, boehmite type and diaspore type are the raw materials for the production of aluminum industry, and there are also two or more mixed types of bauxite. my country is rich in bauxite resources, but the vast majority of bauxite resources in my country belong to the diaspore type ore, and the diaspore type bauxite has the characteristics of perfect crystallization and compact structure. Especially difficult. The bauxite with aluminum-silicon ratio between 4-7 accounts for about 80% of the total reserves in my country's proven bauxite reserves. This determines that when my country uses the pure Bayer process to produce alumina, the dissolution conditions...

Claims

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Application Information

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IPC IPC(8): C01F7/22C01G49/02C01F17/00C01G15/00C25B1/02C25B1/22C25B1/26C25B1/00C01B7/01
CPCC01B7/012C01F7/22C01F17/271C01G15/00C01G49/02C01P2006/12C01P2006/80C25B1/00C25B1/02C25B1/22C25B1/26
Inventor 张廷安吕国志豆志河刘燕王龙赵秋月牛丽萍傅大学张伟光
Owner NORTHEASTERN UNIV
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