Patent ID: 7772145

Claim:
A method for manufacturing carbon-bonded refractory products, comprising: using organic binder agents consisting essentially of a powdery, graphitable coal-tar pitch with a benzo[a]pyrene content less than 500 mg/kg and a coking value of at least about 80% by weight according to DIN 51905 and a graphitable binder agent that is liquid at room temperature with a coking value of at least about 15% by weight and a benzo[a]pyrene content less than 500 ppm according to DIN 51905, wherein said liquid graphitable binder agent consists essentially of a concentration of said powdery, graphitable coal-tar pitch in an amount of 10 to 65% by weight in a high boiling aromatic oil; mixing at room temperature said organic binder agents and refractory granulations to form a mixture; transferring said mixture to a moulded body; and heat treating said mixture at a temperature of 150 to about 400° C.