Method and Apparatus for Producing Metal by Molten-Salt Electrolysis
a technology of molten salt and electrolysis method, which is applied in the direction of electrolysis process, electrolysis components, cells, etc., can solve the problems of limited efficiency, high cost, and easy dissolution in calcium chloride, and achieve the effect of reducing the back reaction of calcium metal and chlorine gas generated during molten salt electrolysis of calcium chloride, reducing cost and reducing cos
Inactive Publication Date: 2008-04-03
TOHO TITANIUM CO LTD +1
View PDF5 Cites 4 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
[0006]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 calcium used for reducing, such as an oxide or chloride of titanium metal, is produced, and in which titanium metal can be obtained by using this metal calcium efficiently at low cost.
[0008]By the present invention, since one electrode of the positive or cathode is surrounding the other electrode and the molten salt flows from the area including the anode to the other area through the communicating holes arranged on the cathode, the calcium metal generated on the surface of the cathode during the molten salt electrolysis always flows to the area not including the anode, and the calcium metal is precipitated and accumulated at the electrolysis bath surface of the area. Therefore, the back reaction with chlorine gas generated on the surface of anode can be avoided, and calcium metal can be produced at high efficiency.
[0010]By this apparatus for production, as described above, calcium metal generated on the surface of the cathode by the molten salt electrolysis is always flowed to the area without the anode, and the calcium metal is precipitated and accumulated at the electrolysis bath surface of the area. Therefore, the calcium metal does not reverse react with chlorine gas generated on the surface of the anode, and the calcium metal can be produced at high efficiency.
[0013]By the present invention, the back reaction of calcium metal and chlorine gas generated during the molten-salt electrolysis of calcium chloride can be reduced, and calcium metal can be efficiently produce at low cost. Furthermore, by directly supplying titanium tetrachloride, titanium metal can also be obtained.
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 has high solubility in calcium chloride, it dissolves easily in the calcium chloride.
However, in this production method, it is necessary to prepare the complex molten salt specially, and the cost is considerable.
Thus, production efficiency is deteriorated.
As explained above, there is a problem in that it is difficult to recover an active metal such as calcium metal alone, and there is a problem in that the cost is high even if the recovery is possible.
As a result, the cost of producing titanium is increased.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
examples
[0053]Using the electrolysis vessel shown in FIG. 1, electrolysis of a molten salt of calcium chloride was performed. The temperature of the electrolysis bath consisting of calcium chloride was maintained at 850±5° C., and the temperature of the circular cathode 4 was also maintained at 850±5° C., and they were not particularly being cooled.
[0054]Molten calcium chloride which is a raw material was continuously supplied to the inside the cathode through the bath supplying pipe 6, and at the same time, the precipitated layer of calcium metal was extracted to the outside of the system through the extracting pipe immersed in the outside the cathode. Calcium metal extracted out of the system was used in a reduction reaction of titanium oxide. On the other hand, chlorine gas generated at the anode was used in a chlorination reaction of titanium ore. Calcium metal was produced corresponding to 80% of theoretical weight calculated from the amount of electricity applied to the cathode and an...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| Area | aaaaa | aaaaa |
Login to View More
Abstract
A 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 a molten salt of calcium chloride in an electrolysis vessel having a anode and a cathode, one of the anode or cathode is arranged surrounding the other electrode, the cathode has at least one hole communicating the inner area surrounded by the cathode with the outer area, and the molten salt flows through the communicating holes from one area including the anode (the inner area or outer area) to the other area.
Description
TECHNICAL FIELD[0001]The present invention relates to the production of metal from a chloride thereof, and in particular, relates to a method for producing calcium metal by molten-salt electrolysis and to a method for producing metal, including a method for producing titanium metal, by using the calcium metal, and relates to an apparatus therefor.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. To overcome this, 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. 2003-129...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): C25C3/02C25C3/28C25C7/00
CPCC22B34/129C25C7/025C25C3/28C25C3/02
Inventor YAMAGUCHI, MASANORIONO, YUICHIKOSEMURA, SUSUMUNISHIMURA, EIJIOGASAWARA, TADASHIYAMAGUCHI, MAKOTOHORI, MASAHIKOUENISHI, TORU
Owner TOHO TITANIUM CO LTD