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A kind of method for electroconversion of magnesium chloride into high-purity magnesium oxide

A technology of magnesium chloride and magnesium oxide, which is applied in the field of electrolysis, can solve the problems of high energy consumption, high cost, and long process, and achieve the effects of high purity, energy saving, and anti-dissolution

Active Publication Date: 2019-04-26
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Aiming at the problems of long process, high energy consumption and high cost in the prior art, the present invention provides a method for electroconverting magnesium chloride into high-purity magnesium oxide, with the purpose of using a wide range of magnesium chloride resources in a short process and low energy consumption to obtain High Purity Magnesium Oxide Products

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  • A kind of method for electroconversion of magnesium chloride into high-purity magnesium oxide
  • A kind of method for electroconversion of magnesium chloride into high-purity magnesium oxide

Examples

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Embodiment 1

[0055] Present embodiment is converted into the method for high-purity magnesium oxide by magnesium chloride electricity, carries out according to the following steps:

[0056] Step 1: Carry out electrolysis to magnesium chloride aqueous solution, the process parameter of electrolysis is: temperature is 20 ℃, the voltage of electrolysis is 3V;

[0057] In described step 1, the mass concentration of described magnesium chloride aqueous solution is 50g / L;

[0058] Step 2: Introduce high-purity carbon dioxide gas into the cathode chamber 3 electrolyte in the cationic membrane electrolyzer with a flow rate of 20m 3 / h, the magnesium carbonate precipitation is directly generated in the cathode chamber 3 of the cationic membrane electrolyzer;

[0059] In the step 2, the high-purity carbon dioxide gas is introduced through the vent hole at the bottom of the cathode chamber 3 of the electrolytic cell.

[0060] Step 3: Stir the cathode chamber 3 of the cationic membrane electrolyzer,...

Embodiment 2

[0066] Present embodiment is converted into the method for high-purity magnesium oxide by magnesium chloride electricity, carries out according to the following steps:

[0067] Step 1: Carry out electrolysis to magnesium chloride aqueous solution, the process parameter of electrolysis is: temperature is 90 ℃, the voltage of electrolysis is 20V;

[0068] In described step 1, the mass concentration of described magnesium chloride aqueous solution is 500g / L;

[0069] Step 2: Introduce high-purity carbon dioxide gas into the cathode chamber 3 electrolyte in the cationic membrane electrolyzer with a flow rate of 90m 3 / h, the magnesium carbonate precipitation is directly generated in the cathode chamber 3 of the cationic membrane electrolyzer;

[0070] In the step 2, the high-purity carbon dioxide gas is introduced through the vent hole at the bottom of the cathode chamber 3 of the electrolytic cell.

[0071] Step 3: Stir the cathode chamber 3 of the cationic membrane electrolyze...

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Abstract

The invention belongs to the field of electrolysis technology, and specifically relates to a method for electrically converting magnesium chloride into high-purity magnesium oxide. The purpose is to use the extensive magnesium chloride resources to obtain high-purity magnesium oxide products in a short process and low energy consumption. The magnesium chloride solution is electrolyzed in a cationic membrane electrolytic cell and CO is introduced into the cathode area. 2 The gas reacts with the electrolyte in the cathode area to directly generate magnesium carbonate, which is stirred during electrolysis; the electrolyte in the cathode area and magnesium carbonate flow in a directional flow through the filter device for solid-liquid separation, and the filtrate is recycled back to the cathode area; the filtered product is dried to obtain magnesium carbonate or Basic magnesium carbonate is calcined to obtain high-purity magnesium oxide product, while CO 2 The gas is recycled; the anode and cathode gases are collected to obtain by-products hydrogen and chlorine. The invention uses an electrolysis method to directly convert magnesium chloride into magnesium carbonate or basic magnesium carbonate. The electrolysis process has a high degree of automation and the resulting product has high purity, which is beneficial to large-scale production and improves production efficiency.

Description

technical field [0001] The invention belongs to the technical field of electrolysis, and in particular relates to a method for electrically converting magnesium chloride into high-purity magnesium oxide. Background technique [0002] Magnesium oxide is a white powder, odorless and tasteless, insoluble in water and ethanol, with a melting point of 2852°C and a boiling point of 3600°C. It can be converted into crystals by burning at a high temperature above 1000°C, and becomes dead-burned magnesium oxide or Sintered magnesium oxide. High-purity magnesia generally refers to products with a magnesia content greater than 98%. High-purity magnesium oxide has excellent acid and alkali resistance, electrical insulation, good light transmission, high thermal conductivity, and large thermal expansion coefficient, and is widely used as a high-temperature heat-resistant material. In addition, it is widely used in the fields of electronics, electrical appliances, optics, instruments, m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/18C25B1/26C25B1/02C01F5/06
CPCC01F5/06C01P2006/80C25B1/02C25B1/18C25B1/26
Inventor 张廷安豆志河刘燕潘喜娟吕国志赵秋月牛丽萍傅大学张伟光
Owner NORTHEASTERN UNIV LIAONING
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