Silicon refining process

Details Silicon refining process Silicon refining process

1978-12-26

1980-12-30

Lutter, Frank W.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

156DIG64, 164 55, 164 68, 164133, 266217, 422247, C30B 1102

Patent

active

042421756

ABSTRACT:
Metallurgical grade silicon is melted and the resulting impure molten metal is continuously flowed downwardly as a thin film through an atmosphere of impurity-reactive gas or gases directly into a crucible, wherein it is subjected to directional solidification. The preferred apparatus for carrying out the process comprises a heated reaction chamber fed peripherally from a superimposed melting chamber, the reaction chamber having horizontally rippled interior wall surfaces of a substantially non-reactive material, such as graphite, silicon carbide, or silicon nitride, so the descending film of molten metal will be agitated and spread laterally. Means are provided for introducing the reactive gas or gases near the bottom of the reaction chamber and for exhausting the spent gas at the top. The reaction chamber is superimposed above and in vertically spaced relationship with an electric furnace, which encircles a columnar crucible. The reaction chamber has a bottom discharge orifice disposed directly above the open mouth of the crucible, and means are provided for gradually raising the furnace relative to the crucible so solidification of received molten metal progresses gradually from the bottom of the crucible upwardly. Means may be provided for introducing an inert gas, such as argon, into the furnace enclosure to prevent reactive gas from entering the furnace area with the molten metal. In either case, the resulting silicon billet is extracted from the crucible and relatively pure and relatively impure portions are separated therefrom.

REFERENCES:
patent: 1889510 (1932-11-01), Amsler
patent: 2734244 (1956-02-01), Herres
patent: 2866701 (1958-12-01), Strauss
patent: 2997384 (1961-08-01), Feichtinger
patent: 3008887 (1961-11-01), Herglotz
patent: 3086850 (1963-04-01), Marino, Jr. et al.
patent: 3337303 (1967-08-01), Lorenzini
patent: 3356489 (1967-12-01), Feichtinger
patent: 4097584 (1978-06-01), Reuschel et al.

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