Method for preparing magnesium-nickel alloy by molten salt electrolysis and device therefor

A molten salt, magnesium-nickel technology, applied in the field of nickel alloys, achieves the effects of large magnesium loss, high vacuum requirements and easy control

Inactive Publication Date: 2011-10-26
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, under the open system, there have been no relevant reports on the method of preparing magnesium-nickel alloys by molten salt electrolysis.

Method used

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  • Method for preparing magnesium-nickel alloy by molten salt electrolysis and device therefor
  • Method for preparing magnesium-nickel alloy by molten salt electrolysis and device therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The steps of the method for preparing the magnesium-nickel alloy are as follows.

[0026] Sodium fluoride and magnesium fluoride are mixed as molten salt, sodium fluoride accounts for 80% of the total mass of the molten salt, and magnesium fluoride accounts for 20% of the total mass of the molten salt.

[0027] Add magnesium oxide accounting for 3.5% of the total mass of sodium fluoride and magnesium fluoride into the molten salt and mix evenly.

[0028] Put the molten salt containing magnesium oxide in the electrolytic cell, heat the molten salt in the electrolytic cell to 1050°C, the two poles start to be energized, and the anode current density during electrolysis is 0.75A / cm 2 , the electrolysis time was 0.9h; then the corundum crucible and cathode filled with magnesium-nickel alloy at the bottom of the electrolytic cell were taken out, put into a new cathode and corundum crucible, and after chemical analysis, a magnesium-nickel alloy with a metal magnesium mass con...

Embodiment 2

[0031] The steps of the method for preparing the magnesium-nickel alloy are as follows.

[0032] Sodium fluoride and magnesium fluoride are mixed as molten salt, sodium fluoride accounts for 95% of the total mass of the molten salt, and magnesium fluoride accounts for 5% of the total mass of the molten salt.

[0033] Add magnesium oxide accounting for 4% of the total mass of sodium fluoride and magnesium fluoride into the molten salt and mix evenly.

[0034] Put the molten salt containing magnesium oxide in the electrolytic cell, heat the molten salt in the electrolytic cell to 1200°C, the two poles start to be energized, and the anode current density during electrolysis is 1A / cm 2 , the electrolysis time was 1.5h; then the corundum crucible and cathode filled with magnesium-nickel alloy at the bottom of the electrolytic cell were taken out, and put into a new cathode and corundum crucible. After chemical analysis, a magnesium-nickel alloy with a metal magnesium mass content o...

Embodiment 3

[0037] The steps of the method for preparing the magnesium-nickel alloy are as follows.

[0038] Sodium fluoride and magnesium fluoride are mixed as molten salt, sodium fluoride accounts for 60% of the total mass of the molten salt, and magnesium fluoride accounts for 40% of the total mass of the molten salt.

[0039] Add magnesium oxide accounting for 3% of the total mass of sodium fluoride and magnesium fluoride into the molten salt and mix evenly.

[0040] Put the molten salt containing magnesium oxide in the electrolytic cell, heat the molten salt in the electrolytic cell to 900°C, the two poles start to be energized, and the anode current density during electrolysis is 0.5A / cm 2 , the electrolysis time is 0.4h; then the corundum crucible and cathode filled with magnesium-nickel alloy at the bottom of the electrolytic cell are taken out, put into a new cathode and corundum crucible, and through chemical analysis, a magnesium-nickel alloy with a metal magnesium mass content...

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Abstract

The invention relates to a method for preparing a magnesium-nickel alloy by molten salt electrolysis and a device therefor. The device consists of an electrolytic cell body, an anode cylinder, a cathode, a connecting lead, a corundum crucible, a temperature thermocouple and an electrical heating body. The electrolytic cell body and the corundum crucible are of the open cylinder structures with bottoms; the anode cylinder is of the structure without a bottom and a cover; and the cathode is placed at the center of the anode cylinder. In the method, sodium fluoride and magnesium fluoride are mixed as the molten salt, and magnesium oxide accounting for 3-4% of the total mass of the sodium fluoride and the magnesium fluoride is added; the molten salt is placed into an electrolytic cell and heated to 900-1,200 DEG C, and then the two poles are electrified, the current density of the anode is 0.5-1A / cm<2>, and the electrolysis time is 0.4-1.5h; then, the corundum crucible containing the magnesium-nickel alloy and the cathode at the bottom of the electrolytic cell are taken out, and finally a new cathode and a new corundum crucible are placed into the electrolytic cell. The magnesium-nickel alloy is prepared in the open system, no metallic magnesium loss occurs, the production is easy to operate, and the magnesium content in the magnesium-nickel alloy can be controlled.

Description

technical field [0001] The invention belongs to the technical field of nickel alloys, in particular to the preparation technology of magnesium-nickel alloys. Background technique [0002] Hydrogen storage alloys have become the most widely used hydrogen storage materials due to their advantages of large hydrogen storage capacity, no pollution, safety and reliability, and long cycle life. Among them, the magnesium-nickel hydrogen storage alloy material is recognized as one of the most promising hydrogen storage materials. At present, the methods for preparing magnesium-nickel alloys include smelting method, chemical co-precipitation method, mechanical alloying method, and combustion synthesis method. [0003] At present, the method of producing magnesium-nickel alloy is mostly smelting method. This method smelts high-purity magnesium and nickel metals. This process is due to the low density of metal magnesium (magnesium density is 1.74g / cm 3 , nickel density 8.88g / cm 3 )...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/36
Inventor 边雪吴文远孙树臣涂赣峰
Owner NORTHEASTERN UNIV LIAONING
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