Preparation of a Carbon-Containing Pellet with High Strength and High Reactivity by Vapor Deposition of Tar to a Cold-Bonded Pellet

Abstract

The optimum conditions for the preparation of carbon-containing pellets (composites) in which the carbonaceous materials derived from coke oven gas (COG) tar are completely filled into the pores of cold-bonded pellets (CPs) by vapor deposition are first investigated using a flow-type quartz fixed-bed reactor. The distribution of carbonaceous material and the crushing strength of the composites are then investigated against prepared composites by means of N2 adsorption measurements, scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy, and a tensile and compression testing machine. The maximum crushing strength of 10 daN is observed in the case of the composite prepared by a combination of tar pyrolysis at 700 °C and vapor deposition at 350 °C; this value matches the maximum crushing strength of commercial metallurgical coke with the same size fraction. Moreover, the 2 nm pores observed in the original CP are absent in the prepared composite. Carbonaceous material derived from ta...