Method of purifying metal salt, method of deacidifying titanium material and method of producing the same

Abstract

A purification method of a metal salt which comprises bringing a metal salt formed by melting an alkali metal salt, an alkaline earth metal salt or a mixture thereof into contact with titanium or the like, thereby adsorbing impurities in the metal salt, a deoxidization method by melting metallic calcium into a molten product of the metal salt purified by the purification method and bringing the same into contact with a titanium material, and a production method of the titanium material which comprises conducting molten salt electrolysis by using the molten product of the purified metal salt for an electrolytic bath. Using the purification or production method the molten metal salt can be purified simply and conveniently at good efficiency. Then, use of the purified metal salt can minimize contamination caused by the metal impurities in the molten salt and the titanium material of high quality can be produced.

Description

TECHNICAL FIELD [0001] The present invention concerns a method of purifying a metal salt, as well as a deoxidization method and a production method of a titanium material and, more in particular, it relates to a method of purifying a metal salt, as well as a deoxidization method and a production method of a titanium material for preventing contamination from a molten salt in a production step and producing products of high quality at a good yield. BACKGROUND ART [0002] In recent years, titanium has been used also as electronic materials including target materials for use in sputtering and the application field thereof has been extending. For generalized use of titanium as materials for electronic parts requiring high accuracy, it is necessary for high purity in view of quality. Recently, further improvement of the quality for use as electronic parts has been demanded and titanium of higher purity is demanded for use in them. [0003] However, since titanium is a metal which is, by nat...

AI Technical Summary

Benefits of technology

The present invention provides a purification method for a metal salt, specifically for molten salts that may contaminate titanium production. The method involves using titanium, titanium alloy, zirconium, or zirconium alloy as adsorbents for metal impurities in the molten salt. By contacting the molten salt with the adsorbents, the content of metal impurities is reduced to extremely low levels, resulting in a high-purity titanium material. The purified molten salt can also be used for deoxidization of titanium and production of titanium material with high purity. The technical effects of the invention include improved purity of titanium and titanium alloys, reduced contamination during production, and improved quality of titanium materials.

Problems solved by technology

However, since titanium is a metal which is, by nature, active, particularly at high temperature, it is liable to undergo contamination from substances in contact therewith in the production step and it is difficult to produce titanium of high purity.

Accordingly, such impurities migrate in the titanium deoxidizing process to titanium products to bring about a problem of contaminating the products.

While contamination of the products can be mitigated by using the salts of alkali metals or alkaline earth metals at the reagent guaranteed class, it industrially requires the use of the metal salt in a great amount, and use of such expensive salt in a great amount is not practical from an economical view point of the cost.

With an aim of purifying a metal salt of a usual grade, while a method of bubbling gaseous chlorine in a molten salt to purify the molten salt has been conducted generally, but this purification method mainly intends to remove the water content remaining in the molten salt and can not remove metal impurities.

Images