KOHLENSTOFF-KIESELERDE-GEMISCH, DARAUS HERGESTELLTES SILICIUM UND VERFAHREN ZU DEREN HERSTELLUNG

摘要

The present invention relates to the production of high purity solar grade silicon from common rice hulls. A unique process for material purification and reduction includes leaching the rice hulls in acid followed by treatment with high purity water, coking the acid-cleaned hulls in a non-oxidizing ambient, compensating the carbon or silica content of the coked hulls to obtain a desired carbon to silica ratio and reducing the silica to produce high purity silicon.