Process for removing alkali and alkaline earth elements from alu

Details Process for removing alkali and alkaline earth elements from alu Process for removing alkali and alkaline earth elements from alu

1988-03-14

1989-05-23

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 93AC, C22B 2100

Patent

active

048327409

ABSTRACT:
A process for removing alkali and alkaline earth metals from aluminum melts is such that aluminum fluoride powder is fed continuously to a carrier gas in an amount of 1-10 g/min. and the gas/powder mixture introduced continuously via lances into the melt which is maintained at a temperature between 690.degree. and 780.degree.C.
The process is characterized by a low consumption of aluminum fluoride per ton of melt to be treated and is particularly suitable for removing sodium and lithium from aluminum-magnesium alloy melts.

REFERENCES:
patent: 3972709 (1976-08-01), Chia
patent: 4470846 (1984-09-01), Dube 75 93 AC

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