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A method for preparing alumina and its comprehensive utilization by chlorination and electrolysis of bauxite pellets

A technology of bauxite and alumina, applied in chemical instruments and methods, rare earth metal chlorides, rare earth metal compounds, etc., can solve the problems of long process, high energy consumption, and inability to comprehensively utilize, so as to reduce processing links, The effect of high product purity and improved resource utilization

Active Publication Date: 2019-02-05
NORTHEASTERN UNIV LIAONING
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  • Description
  • Claims
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Problems solved by technology

[0009] The object of the present invention is to provide a method for preparing alumina by chlorination and electrolysis of bauxite balls and its comprehensive utilization in view of the technical problems of long process, high energy consumption and inability to comprehensively utilize existing technologies. The purpose is to make bauxite into pellets through batching; the pellets can be chlorinated and separated to obtain anhydrous aluminum chloride, anhydrous ferric chloride, silicon tetrachloride, titanium tetrachloride, scandium chloride, chloride Gallium products; convert anhydrous aluminum chloride and ferric chloride into corresponding chloride solutions and directly electrolyze to obtain aluminum hydroxide, ferric hydroxide products, hydrogen products and chlorine gas; chlorine gas generated by electrolysis returns to the chlorination section; hydrogen oxidation Aluminum can be roasted to obtain metallurgical grade alumina or chemical alumina; ferric hydroxide can be calcined to obtain iron red or other iron-containing products; silicon tetrachloride can be further purified and reduced with high-purity zinc to prepare polysilicon, and the by-product zinc chloride can be electrolyzed Zinc and chlorine gas can be obtained, zinc cyclically reduces silicon tetrachloride, and chlorine gas returns to the chlorination section to realize the recycling of zinc and chlorine gas; titanium tetrachloride can be used as raw material for sponge titanium after being refined; scandium is enriched in chlorination slag, Can be used as scandium extraction raw material

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  • A method for preparing alumina and its comprehensive utilization by chlorination and electrolysis of bauxite pellets

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Embodiment 1

[0068] A method for preparing alumina and its comprehensive utilization by chlorination and electrolysis of bauxite pellets, the process flow chart is as follows figure 1 As shown, it specifically includes the following steps:

[0069] (1) Ingredients:

[0070] According to mass ratio, bauxite: coking coal: kaolin=1: 0.2: 0.01 batching, mix uniformly, form mixed material, add the water glass of 1.0% of mixed material gross mass and 2.0% of mixed material gross mass in mixed material water;

[0071] (2) Ball making:

[0072] Mix the mixed material, binder and water evenly, pelletize to obtain pellets with a particle size of 5mm, and air-dry the pellets naturally for 10 hours;

[0073] (3) Pellet chlorination and separation:

[0074] The pellets are chlorinated by microwave heating to form a mixture of anhydrous aluminum chloride, anhydrous ferric chloride, silicon tetrachloride, titanium tetrachloride, scandium chloride and gallium chloride. The materials have different bo...

Embodiment 2

[0092] A method for preparing alumina and its comprehensive utilization by chlorination and electrolysis of bauxite pellets, the process flow chart is as follows figure 1 As shown, it specifically includes the following steps:

[0093] (1) Ingredients:

[0094] According to mass ratio, bauxite: coking coal: kaolin=1: 0.3: 0.03 batching, mix uniformly, form mixed material, add the water glass of 1.6% of mixed material gross mass and 3.8% of mixed material gross mass in mixed material water;

[0095] (2) Ball making:

[0096] Mix the mixed material, binder and water evenly, pelletize to obtain pellets with a particle size of 16mm, and air-dry the pellets naturally for 18 hours;

[0097] (3) Pellet chlorination and separation:

[0098] The pellets are chlorinated by microwave heating to form a mixture of anhydrous aluminum chloride, anhydrous ferric chloride, silicon tetrachloride, titanium tetrachloride, scandium chloride and gallium chloride. The materials have different b...

Embodiment 3

[0116] A method for preparing alumina and its comprehensive utilization by chlorination and electrolysis of bauxite pellets, the process flow chart is as follows figure 1 As shown, it specifically includes the following steps:

[0117] (1) Ingredients:

[0118] According to mass ratio, bauxite monohydrate: coking coal: kaolin=1: 0.2: 0.05 batching, mix uniformly, form mixed material, add the water glass of 1.5% of mixed material gross mass and 3.5% of mixed material gross mass in mixed material water;

[0119] (2) Ball making:

[0120] Mix the mixed material, binder and water evenly, make pellets to obtain pellets with a particle size of 15mm, and air-dry the pellets naturally for 16 hours;

[0121] (3) Pellet chlorination and separation:

[0122] The pellets are chlorinated by microwave heating to form a mixture of anhydrous aluminum chloride, anhydrous ferric chloride, silicon tetrachloride, titanium tetrachloride, scandium chloride and gallium chloride. The materials h...

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Abstract

A method for preparing alumina by chlorination electrolysis and comprehensive utilization of bauxite pellets. The steps are as follows: batch bauxite, carbon source and kaolin according to the proportion, add binder and water, pelletize and air-dry, chlorine, Separate and purify to obtain anhydrous aluminum chloride, anhydrous ferric chloride, silicon tetrachloride, titanium tetrachloride, scandium chloride and gallium chloride; convert anhydrous aluminum chloride and anhydrous ferric chloride into corresponding Chloride solution is electrolyzed by controlling the voltage and current density to obtain aluminum hydroxide, ferric hydroxide, hydrogen and chlorine. The chlorine is returned to the chlorination section; aluminum hydroxide is roasted to obtain metallurgical grade / chemical alumina; ferric hydroxide is calcined to obtain iron. red or other iron-containing products; purify silicon tetrachloride; refine titanium tetrachloride to make sponge titanium raw materials; enrich scandium chloride to make scandium extraction raw materials. The method of the invention is low in cost, the raw materials are cheap and easy to obtain, the chlorination reaction is completed through pelletizing chlorination, the operation process is simple, the degree of automation is high, the product purity is high, and raw materials such as chlorine and zinc can be recycled.

Description

Technical field: [0001] The invention belongs to the technical field of bauxite utilization, and in particular relates to a method for comprehensive utilization of bauxite balls by chlorination and electrolysis. Background technique: [0002] The vast majority of bauxite in my country (>95%) is diaspore type bauxite, and only the bauxite in some areas such as Hainan is gibbsite type, but it has not been used in industry so far. my country's bauxite is characterized by high aluminum, high silicon and low iron (a small number of exceptions), that is, high alumina content and high silicon oxide content, but relatively low aluminum silicon (mostly between 4-7), aluminum silicon High-quality bauxite resources with a ratio of more than 9 only account for 18.5% of the total reserves. The weighted average aluminum-silicon ratio of bauxite in more than 40 typical mining areas across the country is only about 6. Except for a few mining areas such as Guangxi, the iron oxide content...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02C01B33/033C01G9/04C01G49/06C01G15/00C01F17/00C22B34/12C22B58/00C22B59/00C25B1/26C30B35/00
CPCC01B33/033C01F7/02C01F17/271C01G9/04C01G15/00C01G49/06C22B34/1245C22B58/00C22B59/00C25B1/26C30B35/007Y02P10/20
Inventor 张廷安豆志河吕国志刘燕王龙赵秋月牛丽萍傅大学张伟光
Owner NORTHEASTERN UNIV LIAONING
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