Takahiro Shishido

Prebaked Anode from Coal Extract (3) — Carbonization Properties of Hypercoal and Its Blends with Binder Pitch

The preparation of prebaked anodes from coal using solvent extraction technology was investigated. Several bituminous coals were extracted with methylnaphthalene-based solvent under pressurized nitrogen atmosphere at 653K, and ash-free and high purity coal extract (Hypercoal, HPC) was obtained. It was found that the HPC can be utilized as an additive for binder pitch of anode manufacturing; the HPC improves the coke yield of the pitch and reduces the ash content of the binder. It was also found that a suitable modified HPC was self-sinterable, and was successfully molded and carbonized without binder pitch to result of dense carbon specimen. These results suggest the possibility for coal-based raw materials for prebaked anodes

Prebaked Anode From Coal Extract (2) - Effects of the Properties of Hypercoal-Coke on the Preformance of Prebaked Anodes

The preparation of prebaked anodes utilizing coal solvent extraction technology is reported. A steaming coal was extracted with methylnaphthalene-based solvent under pressurized nitrogen atmosphere at 653K, and ash-free coal extract (Hypercoal, HPC) was obtained. The HPC was further heat-treated at 633 to 673 K in the presence of the methylnaphthalene solvent to alter the carbonizing properties of HPC. It was found that adjusting the H/C atomic ratio of HPC in the range 0.6-0.65 suppressed excess dilatation ability of the HPC and produced anode-quality coke. The effect of heat treatment temperature of the HPC on the resultant properties of the HPC coke (HPCC) was also investigated. It was confirmed that HPC is a suitable source of anode coke due to the low content of impurities such as sulfur, nickel, vanadium, and good chemical stability.