Process for separating off solid reaction products, such as carbon, from carbothermically produced silicon

• Main Authors: LERCHENBERGER,AUGUST, URBACH,HANS-PETER,ER.NAT, EISENRITH,KARL-HEINZ, AULICH,HUBERT,DR, SCHULZE,FRIEDRICH-W.,ER.NAT
• Format: Patent
• Language: English; German
• Published: 22.10.1987
• Edition: 4
• Subjects: AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUSPOLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR; CHEMISTRY; CRYSTAL GROWTH; METALLURGY; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE; REFINING BY ZONE-MELTING OF MATERIAL; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE; SINGLE-CRYSTAL-GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL ORUNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL

Carbon, silicon carbide and SiO2 are separated off from molten silicon, produced in an arc furnace, after a so-called holding phase at a temperature above the melting point by directed solidification of the silicon in the melting vessel, the impurity-containing surface layers, after completion of th...