| 摘要 |
PURPOSE:To prepare metallic silicon having high purity usable for solar battery inexpensively in large amt. and with high efficiency by charging carbon or a mixture of carbon and silicon carbide to an arc furnace from the top of the furnace, and feeding SiO2, etc. in the powder form to the high temp. zone. CONSTITUTION:Carbon and/or carbonaceous material, or a mixture thereof with SiC and/or SiO2, is packed in a zone 6 of an arc furnace 1 and SiO2 or an SiO2-cong. material is fed directly to the arc flame 9 generated between an electrode 2 and 3 to cause reaction and melting at high temp., thus, metallic silicon is obtd. The apparatus for the above-described process is constituted of an arc furnace body consisting of a refractory furnace material installed with hollow electrodes 2, 3 provided with a passage 8 for feeding SiO2 or SiO, and a heating device 4 installed to t least a part corresponding to just above the arc flame 9 at the outside of the furnace body of the arc furnace.
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