Apparatus and method for removal of alkali and alkaline earth me

Details Apparatus and method for removal of alkali and alkaline earth me Apparatus and method for removal of alkali and alkaline earth me

1979-08-14

1981-07-07

Andrews, M. J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 93AC, 266227, C22B 902

Patent

active

042772800

ABSTRACT:
For the removal of alkali metal and alkaline earth metal contaminants molten aluminium (including Mg-free aluminium alloys), is passed through an active bed of particles of material containing aluminium fluoride, maintained continuously immersed in molten aluminium. Alkali metal and alkaline earth metal contaminants react and may release insoluble molten reaction products. In order to avoid plugging of the active bed and achieve removal of molten reaction products the molten metal is preferably passed upwardly successively through an inactive filter layer, an active bed layer and a further inactive filter layer.

REFERENCES:
patent: 3010712 (1961-11-01), Judge et al.
patent: 3528801 (1970-09-01), Bylund et al.
patent: 3907962 (1975-09-01), Ogiso
patent: 3917242 (1975-11-01), Bass

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