Method for Producing Ti or Ti Alloy Through Reduction by Ca
a technology of ti alloy and reduction method, which is applied in the direction of improving process efficiency, etc., can solve the problems of increased production cost, increased production cost, and remarkably high product cost, and achieves economic production and high efficiency.
Inactive Publication Date: 2007-12-27
OSAKA TITANIUM TECHNOLOGIES
View PDF8 Cites 11 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
[0013] It is an object of the present invention to provide a method for economically producing a high-purity metallic Ti or a high-purity Ti alloys with high efficiency without using an expensive reducing agent.
Problems solved by technology
However, because the product is produced in a batch manner, production cost is increased and product becomes remarkably expensive.
One of factors of increased production cost is the difficulty of enhancing a feed rate of TiCl4.
Therefore, the rate of the specific-gravity difference substitution cannot respond to the reaction rate, MgCl2 remains in the liquid surface, and TiCl4 is supplied to the MgCl2, which reduces utilization efficiency of TiCl4.
However, the countermeasure proposed in Japanese Patent Application Publication No. 8-295955 is not sufficient.
Therefore, when TiCl4 is supplied at a high rate, cooling cannot keep up with the supply of TiCl4 in the reaction area.
This also causes the feed rate of TiCl4 to be restricted.
However, because of wetting properties (adhesion properties) of the molten Mg, the generated Ti powder moves downward while aggregated, and the Ti particles are sintered to grow in size of the Ti particles due to the temperature of the molten solution during moving downward, which makes it difficult to retrieve the Ti particles toward the outside of the reactor vessel.
Therefore, in the Kroll method, the continuous production is difficult to be performed, and the improvement of the productivity is blocked.
However, it is difficult that the method described in U.S. Pat. No. 4,820,339 is adopted as the industrial Ti production method.
This is because the highly expensive metallic Ca powder is used in order to dissolve Ca in the molten salt of CaCl2.
That is, since the production cost is higher than that of the Kroll method in which the feed rate of TiCl4 is restricted.
In addition, the highly reactive Ca is extremely difficult to handle, which can also be the factor of blocking the industrial application of the method for producing Ti through the reduction by Ca.
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
Embodiment Construction
[0047] An example of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing Ti metals production apparatus according to an example of the present invention.
[0048] A reactor cell 1 in which Ti is generated by introducing Na, a separation cell 2 in which the generated Ti is separated, and an electrolytic cell 3 in which Na is generated are used in the example.
[0049] The reactor cell 1 holds a mixed molten salt of CaCl2 and NaCl, which is of the molten salt. More specifically, in the mixed molten salt, CaCl2 and NaCl are mixed together by a fraction in which a melting point becomes not more than 600° C., and the reactor cell 1 holds the mixed molten salt at the temperature ranging from the melting point to 600° C. The inside of the reactor cell 1 is separated into a Na introduction side and a raw material introduction side by a partition wall 4 except for a bottom portion.
[0050] In the reactor cell 1, the molten Na is introduc...
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 |
|---|---|---|
| Temperature | aaaaa | aaaaa |
| Fraction | aaaaa | aaaaa |
| Melting point | aaaaa | aaaaa |
Login to View More
Abstract
A mixed molten salt containing CaCl2 and NaCl is held in the reactor cell 1 at a temperature not more than 600° C. TiCl4 which is of a Ti raw material is introduced into the reactor cell 1 while Na is introduced into the reactor cell 1. Na introduced into the reactor cell 1 is replaced by Ca, Ca is dissolved in the molten salt, Ca reduces TiCl4 introduced into the reactor cell 1, and thereby Ti particles are generated. The generated Ti particles are introduced to a separation cell 2 along with the molten salt, and the Ti particles and Na are separated from the molten salt. The residual molten salt is introduced to an electrolytic cell 3 to generate Na by high-temperature electrolysis at the temperature more than 600° C. The generated Na is returned to the reactor cell 1 to replenish Na consumed in the reactor cell 1. The highly reactive Ca is not directly handled, and Na which is easy to handle is used in a circulating manner. Therefore, the Ti or Ti alloy can economically be produced by Ca reduction.
Description
TECHNICAL FIELD [0001] The present invention relates to a method for producing Ti or Ti alloys through reduction by Ca, in which a metallic chloride containing TiCl4 is reduced by Ca to produce metallic Ti or the Ti alloys. BACKGROUND ART [0002] A Kroll method for reducing TiCl4 by Mg is generally used as an industrial production method of the metallic Ti. In the Kroll method, the metallic Ti is produced through a reduction step and a vacuum separation step. In the reduction step, TiCl4 which is of a raw material of Ti is reduced in a reactor vessel to produce the sponge metallic Ti. In the vacuum separation step, unreacted Mg and MgCl2 formed as a by-product are removed from the sponge metallic Ti produced in the reactor vessel. [0003] In order to explain the reduction step in detail, in the reduction step, the reactor vessel is filled with the molten Mg, and the TiCl4 liquid is supplied from above a liquid surface of the molten Mg. This allows TiCl4 to be reduced by Mg near the li...
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): C22B34/12C25C3/28C22B5/04C22B26/20C25C3/02
CPCC22B5/04C22B34/1295C22B34/129C22B34/1272Y02P10/20
InventorOGASAWARA, TADASHIYAMAGUCHI, MAKOTOHORI, MASAHIKOUENISHI, TORUTAKEMURA, KAZUO
OwnerOSAKA TITANIUM TECHNOLOGIES