Molten metal treatment

An improved method for dispersing a treatment media in a body of molten aluminum using an impeller to disperse the media in the body of molten aluminum, the method producing increased shear forces in the body of molten aluminum and reducing vortex formation, the method comprising the steps of:

• (a) providing a body of molten aluminum;
• (b) providing an impeller on a shaft in said body;
• (c) adding treatment media to said body;
• (d) dispersing said media by:
• (i) rotating said impeller in one direction;
• and thereafter
• (ii) reversing the direction of rotation of said impeller to a counter direction;
• (iii) the direction of rotation of said impeller being reversed periodically to substantially reduce formation of a vortex around the shaft of said impeller and to provide increased shear forces in said body for purposes of improving treatment of said molten aluminum by improved dispersion of said media therein.

An improved method for dispersing a fluxing gas in a body of molten aluminum using an impeller to disperse the fluxing gas in the body of molten aluminum, the method producing increased shear forces in the body of molten aluminum and reducing vortex formation, the method comprising the steps of:

• (a) providing a body of molten aluminum;
• (b) providing an impeller on a shaft in said body;
• (c) adding fluxing gas to said body by one of passing said fluxing gas through said shaft and adding said fluxing gas adjacent said impeller;
• (d) dispersing said fluxing gas by:
• (i) rotating said impeller in one direction;
• and thereafter
• (ii) reversing the direction of rotation of said impeller to a counter direction;
• (iii) the direction of rotation of said impeller being reversed periodically to substantially reduce formation of a vortex around the shaft of said impeller and to provide increased shear forces in said body for purposes of improving fluxing of said molten aluminum by improved dispersion of said fluxing gas therein.

An improved method for dispersing a fluxing gas in a body of molten aluminum using an impeller to disperse the fluxing gas in the body of molten aluminum, the method producing increased shear forces in the body of molten aluminum and reducing vortex formation, the method comprising the steps of:

• (a) providing a body of molten aluminum;
• (b) providing an impeller on a hollow shaft in said body;
• (c) adding treatment fluxing gas to said body by passing said fluxing gas through said shaft;
• (d) dispersing said fluxing gas by:
• (i) rotating said impeller in one direction;
• and thereafter
• (ii) reversing the direction of rotation of said impeller to a counter direction;
• (iii) the direction of rotation of said impeller being reversed every 0.1 seconds to 5 minutes to substantially reduce formation of a vortex around the shaft of said impeller and to provide increased shear forces in said body for purposes of improving treatment of said molten aluminum by improved dispersion of said fluxing gas therein.

An method for producing increased shear forces in a body of molten metal by movement of the molten metal within the body, the movement providing improved dispersion of a media within the body, the method comprising the steps of:

• (a) providing a body of molten metal;
• (b) projecting a mixing means into said body for applying movement to said body;
• (c) adding media to said body;
• (d) creating said shear forces by:
• (i) applying said mixing means in one direction;
• and thereafter
• (ii) reversing the direction of applying said mixing means to a counter direction;
• (iii) the direction of applying said mixing means being reversed periodically to provide said increased shear forces in said body for purposes of improving dispersion of said molten metal by improved dispersion of said media therein.

An method for producing increased shear forces in a body of molten metal by inducing movement of portions of the molten metal in different directions within the body, the movement providing improved dispersion of a media within the body, the method comprising the steps of:

• (a) providing a body of molten metal;
• (b) projecting a mixing means into said body for applying movement to said body;
• (c) adding media to said body;
• (d) creating shear forces by:
• (i) moving portions of said molten metal in one direction by applying said mixing means in one direction;
• and thereafter
• (ii) moving portions of said molten metal in another direction by changing the direction of applying said mixing means;
• (iii) the direction of applying said mixing means being changed periodically to provide said increased shear forces in said body for purposes of improving dispersion of said molten metal by improved dispersion of said media therein.

An method for producing increased shear forces in a body of molten metal for improved dispersion of a media in the body using mixing means, the method comprising the steps of:

• (a) providing a body of molten metal;
• (b) projecting a mixing means into said body;
• (c) adding treatment media to said body;
• (d) creating said shear forces by:
• (i) applying said mixing means in one direction;
• and thereafter
• (ii) reversing the direction of applying said mixing means to a counter direction;
• (iii) the direction of applying said mixing means being reversed periodically to provide said increased shear forces in said body for purposes of improving dispersion of said molten metal by improved dispersion of said media therein.

An method for producing increased shear forces in a body of molten aluminum for improved dispersion of a treatment media in the body using an impeller, the method comprising the steps of:

• (a) providing a body of molten aluminum;
• (b) providing an impeller on a shaft in said body;
• (c) adding treatment media to said body;
• (d) creating said shear forces by:
• (i) rotating said impeller in one direction;
• and thereafter
• (ii) reversing the direction of rotation of said impeller to a counter direction;
• (iii) the direction of rotation of said impeller being reversed periodically to provide said increased shear forces in said body for purposes of improving treatment of said molten aluminum by improved dispersion of said media therein.

A method for producing increased shear forces in a body of molten aluminum for improved dispersion of fluxing gas in the body using an impeller, the method comprising the steps of:

• (a) providing a body of molten aluminum;
• (b) providing an impeller on a shaft in said body;
• (c) adding fluxing gas to said body by one of passing said fluxing gas through said shaft and adding said fluxing gas adjacent said impeller;
• (d) creating said shear forces and dispersing said fluxing gas by:
• (i) rotating said impeller in one direction;
• and thereafter
• (ii) reversing the direction of rotation of said impeller to a counter direction;
• (iii) the direction of rotation of said impeller being reversed periodically to provide increased shear forces in said body for purposes of improving fluxing of said molten aluminum by improved dispersion of said fluxing gas therein.

A method for producing increased shear forces in a body of molten aluminum for improved dispersion of fluxing gas in the body using an impeller, the method comprising the steps of:

• (a) providing a body of molten aluminum;
• (b) providing an impeller on a shaft in said body;
• (c) adding fluxing gas to said body by one of passing said fluxing gas through said shaft and adding said fluxing gas adjacent said impeller;
• (d) creating said shear forces and dispersing said fluxing gas by:
• (i) rotating said impeller in one direction;
• and thereafter
• (ii) periodically reversing the direction of rotation of said impeller to a counter direction;
• (iii) the direction of rotation of said impeller being reversed after a time period in the range of 0.1 seconds to 5 minutes to provide increased shear forces in said body for purposes of improving fluxing of said molten aluminum by improved dispersion of said fluxing gas therein.

An improved method for dispersing a treatment media in a body of molten metal using an impeller to disperse the media in the body of molten metal, the body having a top surface, the method producing sub-surface turbulent mixing and increased shear forces in the body of molten metal while maintaining tile top surface substantially free of vorticity, the method comprising the steps of:

• (a) providing a body of molten metal;
• (b) providing an impeller on a shaft in said body;
• (c) adding treatment media to said body;
• (d) dispersing said media by:
• (i) rotating said impeller in one direction;
• and thereafter
• (ii) reversing the direction of rotation of said impeller to a counter direction;
• (iii) the direction of rotation of said impeller being reversed periodically to produce sub-surface turbulent mixing and to increase shear forces in said body while maintaining the top surface substantially free of vorticity for purposes of minimizing skim ingestion during treatment of said molten metal with said media.

An improved method for dispersing a treatment media in a body of molten aluminum using an impeller to disperse the media in the body of molten aluminum, the body having a surface, the method producing sub-surface turbulent mixing increased shear forces in the body of molten aluminum while maintaining the top surface substantially free of vorticity, the method comprising the steps of:

• (a) providing a body of molten aluminum;
• (b) providing an impeller on a shaft in said body;
• (c) adding treatment media to said body;
• (d) dispersing said media by:
• (i) rotating said impeller in one direction;
• and thereafter
• (ii) reversing the direction of rotation of said impeller to a counter direction;
• (iii) the direction of rotation of said impeller being reversed periodically to produce sub-surface turbulent mixing and to increase shear forces in said body while maintaining the top surface substantially free of vorticity for purposes of minimizing skim ingestion during treatment of said molten aluminum with said media.

An improved method for dispersing a treatment media in a body of molten metal using an agitator to disperse the media in the body of molten metal, the body having a top surface, the method producing sub-surface turbulent mixing and increased shear forces in the body of molten metal while maintaining the top surface substantially free of vorticity, the method comprising the steps of:

• (a) providing a body of molten metal;
• (b) providing an agitator in said body;
• (c) adding treatment media to said body;
• (d) dispersing said media by:
• (i) rotating said agitator in one direction;
• and thereafter
• (ii) reversing the direction of rotation of said agitator to a counter direction;
• (iii) the direction of rotation of said agitator being reversed periodically to produce sub-surface turbulent mixing and to increase shear forces in said body while maintaining the top surface substantially free of vorticity for purposes of minimizing skim ingestion during treatment of said molten metal with said media.