Development of technology for producing compound coal binder

Abstract

The paper discusses the need of developing an alternative binder to produce anodes. The possibility has been studied of using the tars from semi-coking coal for the production of pitch. It has been shown that the pitch produced from the above tar does not meet the requirements for the pitch used to produce anodes. A technology has been suggested to produce compound pitch by combined heat treatment of low-temp coking coal tar with high-temp coking coal tar. The resulting product is, then, oxidized to produce pitch of anode quality. For combined heat treatment, in addition to the tar obtained by hightemperature coking, it is feasible to use either tar from semi-coking coal or a heavy residue obtained by distilling such tar. The share of the tar from semi-coking coal can be 40-50% in the above mixture. The share of the heavy residue can be 20-30%. The resulting compound pitch meets the requirements for high-temperature pitch of anode quality. Moreover, it shows low carcinogenicity.