| 摘要 |
PURPOSE:To obtain crude pitch coke having a low content of impurities and fine texture and being suitable as a raw material for an isotropic high density carbon material by a simple and inexpensive process by adding fine powder of a carbonaceous material to coal tar pitch contg. no quinoline insolubles, kneading the mixture and charging the mixture to a pipe furnace, and heating by a specified method. CONSTITUTION:Fine carbon powder <=10 pts.wt. is added to 100 pts.wt. coal tar pitch having quinoline insolubles adjusted to <=0.1wt.% by filtration, centrifuging, etc. The mixture is kneaded, and obtd. mixture is charged continuously to a delayed coker by heating it at 420-500 deg.C. Thus, crude pitch coke having 5-25% content of volatile matters is obtd. Suitable fine carbon powder is carbon black, fine graphite powder, etc. An isotropic high density carbon material is obtd. by pulverizing the crude pitch coke to a desired size, then molding, calcining, and graphitizing. Obtd. isotropic high density carbon material has high degree of graphitization, low electric specific resistance, and provides several carbon materials suitable to several fields of uses covering a range from graphite material having also high grindability to those having high hardness and high strength. |
