Research Progress of Coal Based Needle Coke Technology

The paper analyzed the black dense coal tar pitch of the polycyclic aromatic hydrocarbon from the tar distillation as the basic conditions of the needle coke,studied the formation mechanism and coking process of the raw material coal tar pitch middle phase for the coal base needle coke and discussed the disadvantages existed in the production techniques of the coal base needle coke at home and abroad and the domestic needle coke production technique.The paper compared and analyzed the micro structure differences of the coal base needle coke products produced with the different production techniques at home and abroad.The micro structural difference was mainly caused by the insoluble matter of quinoline not fully been removed during the pretreatment of the domestic raw material and thus the full development of the middle phase was hindered.During the solidified coking process,the temperature and time was not effectively controlled.Therefore in comparison with the quality of the overseas needle coke,the production technique and quality of the domestic coal base needle coke shall be developed and improved.