Apparatus for producing high purity silicon from flames of sodiu

Details Apparatus for producing high purity silicon from flames of sodiu Apparatus for producing high purity silicon from flames of sodiu

1986-12-04

1991-06-04

Warden, Robert J.

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Soap making

422198, 423348, 423349, 423350, 239505, 239520, B01J 1400, C01B 3302

Patent

active

050212214

ABSTRACT:
Vaporized silicon halide is mixed with a vaporized alkali metala in a reactor chamber in an exothermic reaction producing liquid silicon droplets and gaseous alkali metal halide, and then passed out of the reactor chamber through a nozzle in a supersonic jet. The supersonic jet is produced by utilizing vacuum means to maintain the exit chamber at a lower pressure than the reactor chamber. Separation of the silicon from the salt by-products is performed by shock wave impaction separation technique wherein the products of the complete reaction between the alkali metal and silicon halide are made to impinge upon an unrestricted, flat surface so that the direction of flow of the gas changes abruptly and a shock zone is created above the flat surface. The silicon droplets are carried by their large forward momentum through the shock zone onto the separating surface where they are deposited. The gaseous alkali metal halide flows across the surface and is thus separated from the silicon product. The silicon droplets are removed in a variety of physical configurations to produce silicon in pellet form, sheet form, ingot form, or single crystal silicon.

REFERENCES:
patent: 3084874 (1963-04-01), Jones et al.
patent: 3497141 (1970-02-01), Rydberg
patent: 3957465 (1976-05-01), Pircon
patent: 4027053 (1977-05-01), Lesk
patent: 4102765 (1978-07-01), Fey et al.
Olson et al., Silicon Halaide-Alkali Metal Flames as a Source of Solar Grade Silicone, DOE/JPL 954777 79/7.

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