METHOD FOR ANNEALING OF CARBON-CONTAINING HALF-FINISHED PRODUCTS Russian patent published in 1997 - IPC

FIELD: production of fireproof bricks, graphite electrodes. SUBSTANCE: graphite half-finished is impregnated by pitch or by similar carbon-containing material is placed into autoclave, sealed, evacuated and heated. Heating is carried out in the medium of inert gas to coking temperature of impregnating material, the process is followed by heating to roasting temperature at operation pressure 7·10⁵ - 10⁸ Pa. Then half-finished products are cooled and excess gas is exhausted. Nitrogen is used as said inert gas, excess gas is purified preferably by complete combustion. EFFECT: improved efficiency. 8 cl, 1 dwg