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Method for preparing aluminum oxide by electrolyzing aluminum chloride

A technology of aluminum chloride and alumina, applied in the field of electrolysis, can solve the problems of high cost, high energy consumption, large pollution, etc., and achieve the effects of short process flow, high purity and lower production cost

Inactive Publication Date: 2017-07-21
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems of high energy consumption, high cost and heavy pollution in the prior art, the present invention provides a method for preparing alumina by electrolysis of aluminum chloride, the purpose of which is to utilize a wide range of aluminum chloride resources in a short-process and low-energy-consumption Obtain metallurgical grade alumina or chemical alumina products

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  • Method for preparing aluminum oxide by electrolyzing aluminum chloride

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Embodiment 1

[0044] In this embodiment, the method for electroconverting aluminum chloride into alumina is carried out in the following steps:

[0045] Step 1: electrolyze the aluminum chloride aqueous solution, the process parameters of the electrolysis are: the temperature is 20°C, and the voltage of the electrolysis is 3V;

[0046] In described step 1, the mass concentration of described aluminum chloride aqueous solution is 50g / L;

[0047] Step 2: Control the electrolytic current density of the cationic membrane electrolyzer to 0.01A / cm 2 , so that aluminum hydroxide is directly generated in the cathode chamber 1 of the cationic membrane electrolyzer;

[0048] Step 3: Stir the cathode chamber 1 of the cationic membrane electrolyzer, the electrolyte and aluminum hydroxide in the cathode chamber 1 flow in a directional manner, filter through the filter device 6, and separate the solid and liquid to obtain aluminum hydroxide and filtrate, and the filtrate is circulated back to the cathod...

Embodiment 2

[0054] Step 1: electrolyzing the aluminum chloride aqueous solution, the process parameters of the electrolysis are as follows: the temperature is 90°C, and the voltage of the electrolysis is 20V;

[0055] In described step 1, the mass concentration of described aluminum chloride aqueous solution is 200g / L;

[0056] Step 2: Control the electrolytic current density of the cationic membrane electrolyzer to 0.6A / cm 2 , so that aluminum hydroxide is directly generated in the cathode chamber 1 of the cationic membrane electrolyzer;

[0057] Step 3: Stir the cathode chamber 1 of the cationic membrane electrolyzer, the electrolyte and aluminum hydroxide in the cathode chamber 1 flow in a directional manner, filter through the filter device 6, and separate the solid and liquid to obtain aluminum hydroxide and filtrate, and the filtrate is circulated back to the cathode Chamber 1 is used as the electrolyte in cathode chamber 1; the solution in anode chamber 2 is continuously extracted...

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Abstract

The invention belongs to the technical field of electrolysis and particularly relates to a method for preparing aluminum oxide by electrolyzing aluminum chloride. The method aims to obtain metallurgical grade aluminum oxide or chemical aluminum oxide products through extensive aluminum chloride with a short process and low energy consumption. An aluminum chloride solution is electrolyzed through a cation membrane electrolytic cell, and mechncial stirring is conducted on an electrolytic cell cathode zone; an electrolyte and aluminum hydroxide are subjected to solid-liquid separation through a filter device, and a filtrate circularly returns to the cathode zone; aluminum hydroxide is obtained by drying filtration products and roasted to obtain metallurgical grade aluminum oxide or chemical aluminum oxide; and anode gas and cathode gas are collected, and by-products of hydrogen and chlorine are obtained. The electrolysis method is adopted for directly converting aluminum chloride into aluminum hydroxide, the electrolysis process is high in automation degree and short in process, the production cost is reduced advantageously, and the production efficiency is improved advantageously.

Description

technical field [0001] The invention belongs to the technical field of electrolysis, and in particular relates to a method for preparing alumina by electrolyzing aluminum chloride. Background technique [0002] Alumina is a white amorphous powder, insoluble in water, soluble in inorganic acids and alkaline solutions, with a melting point of 2050°C and a boiling point of 2980°C. At present, it is generally believed that alumina mainly has two variants, α-type and γ-type, and γ-Al 2 o 3 It is made by dehydrating aluminum hydroxide at a low temperature of 140-150°C. It is also called activated alumina and aluminum glue in industry. γ-type alumina is insoluble in water, but soluble in strong acid or strong alkali solution, and it will be completely transformed into α-type alumina when heated to 1200°C. [0003] According to different uses, alumina is divided into two categories: one is alumina used as raw material for electrolytic aluminum, called metallurgical grade alumina;...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/00C25B9/00C25B15/00
CPCC25B1/00C25B9/00C25B15/00
Inventor 张廷安刘燕潘喜娟吕国志豆志河赵秋月牛丽萍傅大学张伟光王艳秀
Owner NORTHEASTERN UNIV
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