Method for Production of Metal by Molten-Salt Electrolysis and Method for Production of Titanium Metal

a technology of molten salt and metal, which is applied in the field of metal recovery, can solve the problems of reducing the yield of metal, limiting the efficiency of metal recovery, and difficult to recover metal such as calcium metal efficiently by conventional methods, and achieves the effect of reducing the solubility of metal in molten sal

Inactive Publication Date: 2008-03-06
TOHO TITANIUM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005] The present invention has been completed in view of the above circumstances, and an object of the present invention is to provide a method for production of metal by molten-salt electrolysis, in which metal used for reducing, such as an oxide or chloride of titanium metal, is efficiently recovered, and another object of the present invention is to provide a method for production of titanium metal in which the metal produced by the method is used.
[0006] The method for production of metal by molten-salt electrolysis of the present invention is a method for production of metal by molten-salt electrolysis which is performed by filling molten salt of a metal chloride in an electrolysis vessel having an anode and a cathode, and a molten salt which reduces solubility of the metal in the molten salt is used.
[0008] By the method for production of metal by molten-salt electrolysis of the present invention, since the solubility of the metal in the molten salt is reduced, the metal that is deposited is difficult to dissolve in the molten salt. Therefore, the metal can be effectively recovered.

Problems solved by technology

However, since the Kroll method is a batch process in which a set of operations is repeated noncontinuously, there is a limitation to its efficiency.
However, since the calcium metal generated during the electrolytic reaction is in a liquid state and is highly soluble in calcium chloride, it dissolves easily in the calcium chloride, and there has been a problem in that the yield of the metal is reduced.
As explained above, there has been a problem in that it has been difficult to recover metal such as calcium metal efficiently by a conventional method.

Method used

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  • Method for Production of Metal by Molten-Salt Electrolysis and Method for Production of Titanium Metal
  • Method for Production of Metal by Molten-Salt Electrolysis and Method for Production of Titanium Metal

Examples

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example 1

[0042] Using the electrolysis vessel shown in FIG. 1, while maintaining the temperature of the electrolysis bath consisting of calcium chloride at 75 mol % and potassium chloride at 25 mol % at 650° C., and applying a voltage of 4.5 V between an anode 3 made of carbon and the cathode 4 made of carbon steel, the electrolysis of the molten salt of calcium chloride is started. Accompanied by the electrolysis of the molten salt, calcium metal is deposited on the cathode in a solid state. After depositing a predetermined amount of calcium metal on the cathode in a solid state, electric power supply to the positive and cathodes is stopped. After that, the cathode, having deposited calcium metal on its surface, is transferred to a recovery vessel which is heated to a temperature not less than the melting point of calcium metal, and the calcium metal deposited on the surface of the cathode is melted so that it can be recovered. The ratio of the amount of calcium metal actually recovered to ...

example 2

[0043] Using the electrolysis vessel shown in FIG. 1, while maintaining the temperature of the electrolysis bath consisting of calcium chloride at 85 mol % and potassium chloride at 15 mol % at 730° C., and applying a voltage of 5.0 V between an anode 3 made of carbon and the cathode 4 madc of low-carbon steel, the electrolysis of the molten salt of calcium chloride was started. Accompanied by the electrolysis of the molten salt, calcium metal in a solid state floated up to the bath surface around the cathode. The electrolysis bath and calcium metal were drawn off and recovered from the bath surface around the cathode. The recovered calcium content in the electrolysis bath was measured to be 50%. The amount of calcium metal generated was measured from the recovered amount and the concentration, and a ratio was calculated with a theoretical generated amount calculated from the time of electric power supply. As a result, it was confirmed that not less than 75% of calcium metal was rec...

example 3

[0044] Using the electrolysis vessel shown in FIG. 1, while maintaining the temperature of the electrolysis bath consisting of calcium chloride at 85 mol % and potassium chloride at 15 mol % at 950° C., and applying a voltage of 5.0 V between an anode 3 made of carbon and a cathode 4 made of low-carbon steel, the electrolysis of the molten salt of calcium chloride was started. Accompanied by molten-salt electrolysis, calcium metal in a melted state floated up to the bath surface around the cathode. The electrolysis bath and melted calcium metal were drawn off and recovered from the bath surface around the cathode. Melted calcium was recovered and the concentration of calcium in the electrolysis bath which was recovered was measured and was 30%. The amount of calcium metal generated was measured from the recovered amount and the concentration, and a ratio with a theoretical generated amount calculated from the time of electric power supply was calculated. As a result, it was confirme...

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Abstract

A method for production of metal by molten-salt electrolysis is a method for production of metal by molten-salt electrolysis which is performed by filling molten salt of a metal chloride in an electrolysis vessel having an anode and a cathode, and a molten salt which reduces solubility of the metal in the molten salt is used.

Description

TECHNICAL FIELD [0001] The present invention relates to the recovery of metal from a chloride thereof, and in particular, relates to a method for production of metal by molten-salt electrolysis. Furthermore, the present invention relates to a method for production of titanium metal using the metal produced by the method. BACKGROUND ART [0002] Conventionally, titanium metal, which is a simple substance, is produced by the Kroll method, in which titanium tetrachloride is reduced by molten magnesium to obtain sponge titanium, and various kinds of improvements have been made to reduce the cost of production. However, since the Kroll method is a batch process in which a set of operations is repeated noncontinuously, there is a limitation to its efficiency. [0003] To overcome this problem, a method in which titanium oxide is reduced by calcium metal in molten salt to obtain titanium metal directly (see WO99 / 064638 and Japanese Unexamined Patent Application Publication No. 2003-129268), on...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C25C3/28
CPCC22B34/129C25C3/28C25C3/02C25B1/26
Inventor YAMAGUCHI, MASANORIONO, YUICHIKOSEMURA, SUSUMUNISHIMURA, EIJIOGASAWARA, TADASHIYAMAGUCHI, MAKOTOHORI, MASAHIKOUENISHI, TORU
Owner TOHO TITANIUM CO LTD
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