| 摘要 |
The filter cake resulting from the filtration of tar, pitch, coal extract or coal oil with the help of a filter aid, is dried by blowing an inert gas through it. Thereafter it is comminuted to a particle size of about 0.5 mm and these particles are heated in a fluidized bed at the rate of 1000 DEG C./min to a temperature of 500 DEG -1200 DEG C. There is obtained a size mix of swelled particles from which a fraction having a size of about 0.05-0.3 mm is segregated and recirculated to the filter as a filter aid. Particles having a size above or below the segregated fraction are thermally decomposed, as are gaseous and liquid products which are liberted during the thermal treatment in the fluidized bed. |
