Method For Reducing Or Eliminating Si, Fe, And Cu In Aluminum Alloys

Abstract

A method for reducing or eliminating Si contained in an aluminum alloy including: holding the aluminum alloy and Sn at a melt temperature at which the aluminum alloy and Sn are melted; lowering the melt temperature, and holding the aluminum alloy and Sn at a Si crystallization temperature at which solid Si is crystallized while maintaining a molten state of Sn and Al, and separating the solid Si; and further lowering the temperature and holding the aluminum alloy and Sn at an Al crystallization temperature at which Al is crystallized and Sn is in the molten state, to separate and recover solid Al.

1 . A method for reducing or eliminating Si contained in an aluminum alloy comprising:
 holding the aluminum alloy and Sn at a melt temperature at which the aluminum alloy and Sn are dissolved;   lowering the melt temperature, and holding the aluminum alloy and Sn at a Si crystallization temperature at which solid Si is crystallized while maintaining a molten state of Sn and Al, and separating the solid Si; and   further lowering the temperature and holding the aluminum alloy and Sn at an Al crystallization temperature at which Al is crystallized and Sn is in the molten state, to separate and recover solid Al.   
     
     
         2 . A method for reducing or eliminating Si and Fe contained in an aluminum alloy comprising:
 holding the aluminum alloy and Sn at a melt temperature at which the aluminum alloy and Sn are dissolved;   lowering the melt temperature, and holding the aluminum alloy and Sn at a Si crystallization temperature at which solid Si and/or Al 3 Fe is crystallized while maintaining a molten state of Sn, Al, and Fe, and separating the solid Si and/or Al 3 Fe; and   further lowering the temperature, and crystallizing and separating Al and/or Al 3 Fe while melting and holding Fe in molten Sn.   
     
     
         3 . A method for reducing or eliminating Si and Cu contained in an aluminum alloy comprising:
 holding the aluminum alloy and Sn at a melt temperature at which the aluminum alloy and Sn are dissolved;   lowering the melt temperature, and holding the aluminum alloy and Sn at a Si crystallization temperature at which solid Si and/or Al 2 Cu is crystallized while maintaining a molten state of Sn, Al, and Cu, and separating the solid Si and/or Al 2 Cu; and   further lowering the temperature, and crystallizing and separating Al and/or Al 2 Cu while melting and holding Cu in molten Sn.   
     
     
         4 . A method for reducing or eliminating Fe contained in an aluminum alloy comprising:
 holding the aluminum alloy and Sn at a melt temperature at which the aluminum alloy and Sn are dissolved; and   lowering the melt temperature, and crystallizing and separating Al and/or Al 3 Fe while melting and holding Fe in molten Sn.   
     
     
         5 . A method for reducing or eliminating Cu contained in an aluminum alloy comprising:
 holding the aluminum alloy and Sn at a melt temperature at which the aluminum alloy and Sn are dissolved; and   lowering the melt temperature, and crystallizing and separating Al and/or Al 2 Cu while melting and holding Cu in molten Sn.