Method for producing magnesium metal by direct electrolysis of magnesia

A technology of magnesium oxide and metal magnesium, which is applied in the field of metal materials to achieve the effect of saving energy consumption

Inactive Publication Date: 2005-09-07
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose a method for direct electrolysis of magnesium oxide to produce metal magnesium, aiming at the disadvantages that the current magnesium electrolysis industry must use magnesium oxide chlorination to obtain anhydrous magnesium chloride raw materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: In 120KA magnesium electrolyzer without clapboard, bischofite is raw material production of metallic magnesium

[0013] Using mixed molten salt of neodymium chloride and magnesium chloride as the electrolyte, the molar percentages of neodymium chloride and magnesium chloride are 20 and 80% respectively, the solubility of magnesium oxide is 10% by weight, the electrolysis temperature is 720°C, graphite is the anode, and the cell voltage is 4.8V , the current efficiency reaches 90%, the DC power consumption per kilogram of Mg is 11.77kWh, and the purity of metal magnesium is 99.95%.

Embodiment 2

[0014] Embodiment 2: in 65KA there is the magnesium electrolyzer of dividing plate to be raw material to produce metal magnesium

[0015] Using mixed molten salt of neodymium chloride and magnesium chloride as the electrolyte, the molar percentages of neodymium chloride and magnesium chloride are 30% and 70% respectively, the solubility of magnesium oxide is 8% by weight, the electrolysis temperature is 760°C, graphite is the anode, and the cell voltage is 4.5 The V current efficiency reaches 85%, the DC power consumption per kilogram of Mg is 11.68kWh, and the purity of metal magnesium is 99.95%.

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Abstract

The invention relates to a method of making magnesium through electrolyzing magnesia directly, which belongs to the metal material field, characterized in that it uses the magnesia as raw material, uses the neodymium chloride and magnesium chloride as the fused salt electrolyte, wherein the mole percent of neodymium chloride and magnesium chloride is 20~30% and 70~80%. The mixed fused salt has lower fusible point and better conductivity in the range 650~800 Deg.c, in particular that the magnesium has lower dissolvability, and the weight percentage of magnesia dissolvability is 5~10%, the electrolyzing temperature is 720~760 Deg.c, the tank voltage is 4.5~6.5V, and the electric current efficiency can reach 85~90 Deg.c, the direct current consumption of magnesium per kilogram is 11~12.5kwh, the purity of magnesium is above 99.5%. The method is a new highly-effective metallurgical technology with no pollution.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to a method for directly electrolyzing magnesium oxide to produce metal magnesium. Background technique [0002] Magnesium is an important light metal with a wide range of uses. So far, the main methods of producing magnesium in the world are magnesium chloride molten salt electrolysis and thermal reduction, of which the magnesium produced by magnesium chloride molten salt electrolysis accounts for 60%. The magnesium smelting methods of the magnesium-producing countries in the world organize the magnesium industry according to their own resource characteristics. my country is rich in magnesite resources, accounting for one-third of the world's total. Therefore, my country's magnesium electrolysis is based on magnesite to organize magnesium industrial production. Firstly, magnesite is calcined above 1000°C to obtain magnesium oxide, then chlorinated with magnesium oxide to prepare an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/04
Inventor 卢惠民
Owner UNIV OF SCI & TECH BEIJING
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