Method for fluxing molten-metal
OwnerC. Edward Eckertinventor
Life of this patent
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Abstract
An improved method for dispersing high levels of fluxing gas in a body of molten aluminum using an impeller or disperser 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 comprises the steps of providing a body of molten aluminum and a disperser in the body. A fluxing gas is added to the body at the rate of 1 to greater than 200 SCF/hour and dispersed by rotating the disperser in one direction and thereafter reversing the direction of rotation to a counter direction. The direction of rotation is reversed periodically to substantially reduce formation of a vortex and to provide increased shear forces in the body for purposes of improving dispersion of the fluxing gas in the molten aluminum.
Claims25
An improved method for fluxing a body of molten aluminum using a disperser to disperse 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 a disperser in said body;
- (c) adding fluxing gas to said body, said fluxing gas being provided at a rate in the range of 1 to greater than 650 SCF/hour;
- and
- (d) dispersing said fluxing gas in said body by:
- (i) rotating said disperser in one direction;
- and thereafter
- (ii) reversing the direction of rotation of said disperser to a counter direction;
- (iii) the direction of rotation of said disperser being reversed periodically to substantially reduce formation of a vortex 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 improved method for dispersing a fluxing gas in a body of molten aluminum using a disperser 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 a disperser in said body;
- (c) adding fluxing gas to said body at a rate in the range of 5 to 425 SCF/hour, the fluxing gas comprised of Cl.sub.2 and SF.sub.6 in a ratio in the range of 2:1 to 10:1 parts Cl.sub.2 to SF.sub.6 ;
- and
- (d) dispersing said fluxing gas by:
- (i) rotating said disperser in one direction;
- and thereafter
- (ii) reversing the direction of rotation of said disperser to a counter direction;
- (iii) the direction of rotation of said disperser being reversed periodically to substantially reduce formation of a vortex 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 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, the fluxing gas being added at a rate in the range of 5 to greater than 250 SCF/hour;
- and
- (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 a 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 a impeller on a hollow shaft in said body;
- (c) adding treatment fluxing gas to said body by passing said fluxing gas through said shaft at a rate in the range of 5 to 50 SCF/hour;
- and
- (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.
A method for producing increased shear forces in a body of molten aluminum by movement of the molten metal within the body, the movement providing improved dispersion of a fluxing gas within the body, the method comprising the steps of:
- (a) providing a body of molten aluminum;
- (b) providing a mixing means for applying movement to said body;
- (c) adding fluxing gas to said body at a rate in the range of 1 to 425 SCF/hour;
- and
- (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 fluxing gas therein.
A method for producing increased shear forces in a body of molten aluminum by inducing movement of portions of the molten aluminum in different directions within the body, the movement providing improved dispersion of a fluxing gas within the body, the method comprising the steps of:
- (a) providing a body of molten aluminum;
- (b) providing a mixing means for applying movement to said body;
- (c) adding a fluxing gas comprised of Cl.sub.2 and SF.sub.6 in a ratio in the range of 2:1 to 10:1 parts Cl.sub.2 to SF.sub.6 to said body at a rate in the range of 1 to 200 SCF/hour;
- and
- (d) creating shear forces by:
- (i) moving portions of said molten aluminum in one direction by applying said mixing means in one direction;
- and thereafter
- (ii) moving portions of said molten aluminum 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 fluxing gas therein.
An improved method for dispersing a fluxing gas in a body of molten aluminum using an agitator to disperse the fluxing gas in the body of molten aluminum, the body having a top surface, the method producing sub-surface turbulent mixing and 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 agitator in said body;
- (c) adding fluxing gas to said body at a rate in the range of 1 to 200 SCF/hour;
- (d) dispersing said fluxing gas 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 fluxing gas.
Dependencies are inferred from the claim text.