Sigri Gmbh

Hubert Jager

Alfred Lorenz

Carbonates, oxides, carbides or fluorides of alkaline earth metals are added to coal tar pitches before coking. After the coking, which is preferably carried out by the delayed coking process, this produces coal tar pitch cokes or coal tar pitch needle cokes which have no irreversible expansion or a strongly reduced irreversible expansion upon heating in the temperature range of 1400.degree. to 2000.degree. C.

Process for the inhibition of the puffing of cokes produced from coal

The process produces carbon bodies from coal tar pitch coke which have a strongly reduced or no irreversible thermal expansion in the temperature range of 1400.degree. to 2000.degree. C. Before shaping, a sulphonate, carboxylate or phenolate of an alkaline earth metal which is at least partially soluble in the binder is added to the mixing constituents which consist of particulate coke and a cokable binder as raw materials. After the mixing, shaping and firing, bodies are obtained which have only slight puffing upon graphitization.

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Munich, Georgia

Hubert Jager