High-purity lining for an electric low shaft furnace

Details High-purity lining for an electric low shaft furnace High-purity lining for an electric low shaft furnace

1990-02-26

1990-11-20

Hill, Jr., Robert J.

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Including specific material of construction

422240, 422248, 432262, 432264, 432265, F27B 1408, F27B 1406, F27B 1410

Patent

active

049717723

ABSTRACT:
An inside lining for the reaction chamber of an electric low shaft furnace, particularly for producing high-purity silicon from silicon oxide by carbothermic reduction, is provided which has a melting crucible of dense graphite and a thermal insulation, whereby at least the floor of the reaction chamber has an inside lining of high-purity carbon. The inside lining is constructed from graphite, graphite grits or lampblack. The inside lining provides good thermal insulation and does not further contaminate the molten metal due to furnace materials. The inside lining prevents a loss of material in that seepage of molten metal into the insulation is prevented by a rapid dropoff of the temperature in the insulation below the melting point of the metal.

REFERENCES:
patent: 3227431 (1966-01-01), Steeves
patent: 4247528 (1981-01-01), Dosaj et al.
patent: 4262039 (1981-04-01), Gyarmati et al.
patent: 4390504 (1983-06-01), Enomoto et al.
patent: 4460556 (1984-07-01), Aulich et al.
patent: 4528667 (1985-07-01), Aulich et al.
patent: 4820341 (1989-04-01), Lask et al.
H. A. Aulich et al, Solar-Grade Silicon Prepared by Advanced Carbothermic Reduction of Silica, Siemens Forsch.--U. Entwickl.--Ber. Bd. 15 (1986), No. 4, Springer-Verlag, 1986, pp. 157-162.

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