Investigation on coking behaviours of heavy oil-coal blends has been done by means of solvent extraction, the measurements crusible swelling number (CSN), volatile (VM), microstrength index (MSI) and polarized-light microscopic observations. Pitches were prepared from several heavy oils, which are virgin reduced crudes, sand oil and thermal tar as starting materials, by heat-treating at a temperature range of 350-580°C.
It is found that the pitches processed at a critical conditions show swelling behaviours similar to those of coking coal during coking. Compatibility between the pitches and coking coals is recognized, but not recognized for non-coking coal blends. From these results obtained here, the application of heavy oil for metallugical coke manufacturing becomes possible.
