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.

1 . A method of purifying a metal salt which comprises bringing the metal salt formed by melting an alkali metal salt, an alkaline earth metal salt or a mixture thereof into contact with one or more of titanium, titanium alloy, zirconium and zirconium alloy, thereby adsorbing impurities in the metal salt.  
     
     
         2 . A purification method of a metal salt according to  claim 1 , wherein the metal salt is melted in a vessel made of titanium or titanium alloy, or a vessel lined with titanium or titanium alloy.  
     
     
         3 . A purification method of a metal salt according to  claim 1 , wherein foil-like titanium is used as an adsorbent.  
     
     
         4 . A method of deoxidizing a titanium material comprising dissolving metallic calcium to a molten product of a metal salt purified by the purification method according to  claim 1  and bringing the same into contact with the titanium material.  
     
     
         5 . A deoxidization method of a titanium material according to  claim 4 , wherein calcium chloride is used as the molten salt.  
     
     
         6 . A deoxidization method of a titanium material according to  claim 4 , wherein the exactly same vessel used for the purification of the metal salt is used.  
     
     
         7 . A method of producing a titanium material which comprises conducting molten salt electrolysis by using a molten product of a metal salt purified by the purification method according to  claim 1  for electrolytic bath.  
     
     
         8 . A production method of a titanium material according to  claim 7 , wherein an LiCl—KCl system mixed salt is used under electrolysis as the molten salt.  
     
     
         9 . A production method of a titanium material according to  claim 7 , wherein the exactly same vessel used for the purification of metal salt is used.  
     
     
         10 . A purification method of a metal salt according to  claim 2 , wherein foil-like titanium is used as an adsorbent.  
     
     
         11 . A method of deoxidizing a titanium material comprising dissolving metallic calcium to a molten product of a metal salt purified by the purification method according to  claim 2  and bringing the same into contact with the titanium material.  
     
     
         12 . A deoxidization method of a titanium material according to  claim 5 , wherein the exactly same vessel used for the purification of the metal salt is used.  
     
     
         13 . A method of producing a titanium material which comprises conducting molten salt electrolysis by using a molten product of a metal salt purified by the purification method according to  claim 2  for electrolytic bath.  
     
     
         14 . A production method of a titanium material according to  claim 8 , wherein the exactly same vessel used for the purification of metal salt is used.