PREBAKED ANODE FROM COAL EXTRACT (2) - EFFECTS OF THE PROPERTIES OF HYPERCOAL-COKE ON THE PREFORMANCE OF PREBAKED ANODES

摘要

The preparation of prebaked anodes utilizing coal solventextraction technology is reported. A steaming coal was extractedwith methylnaphthalene-based solvent under pressurized nitrogenatmosphere at 653K, and ash-free coal extract (Hypercoal, HPC)was obtained. The HPC was further heat-treated at 633 to 673 Kin the presence of the methylnaphthalene solvent to alter thecarbonizing properties of HPC. It was found that adjusting theH/C atomic ratio of HPC in the range 0.6-0.65 suppressed excessdilatation ability of the HPC and produced anode-quality coke.The effect of heat treatment temperature of the HPC on theresultant properties of the HPC coke (HPCC) was alsoinvestigated. It was confirmed that HPC is a suitable source ofanode coke due to the low content of impurities such as sulfur,nickel, vanadium, and good chemical stability.