PROCESS FOR MAKING RAW MATERIAL BODIES ESPECIALLY FOR THE PRODUCTION OF SILICON OR SILICON ALLOYS

摘要

Raw material bodies such as briquettes, for use in the production of silicon or silicon alloys, are formed by mixing a pitch and caking coal at a temperature above 100 DEG C. and up to 200 DEG C. to form a pitch/coal alloy. This hot binder composition is mixed with sand and a noncaking carbon carrier at a temperature in this range to form the starting composition from which preforms are pressed. The preforms are subjected to a heat treatment which involves raising the temperature to above 450 DEG C., preferably in a sand filled rotary furnace to harden the preforms into the bodies.