Izinto zokusetshenziswa zokukhiqiza ama-electrode e-graphite yi-petroleum coke, inaliti ye-coke kanye ne-coal pitch.

I-petroleum coke ingumkhiqizo oqinile ovuthayo otholakala kuzinsalela ze-petroleum kanye ne-asphalt ye-petroleum ngokufaka i-coking. Umbala umnyama futhi une-porous, isici esiyinhloko yikhabhoni, futhi okuqukethwe komlotha kuphansi kakhulu, ngokuvamile ngaphansi kuka-0.5%. I-petroleum coke iwuhlobo lwekhabhoni ye-graphitized elula, i-petroleum coke inokusetshenziswa okubanzi embonini yamakhemikhali, i-metallurgy nezinye izimboni, futhi iyimpahla eyinhloko yokukhiqiza imikhiqizo ye-graphite yokwenziwa kanye nemikhiqizo ye-electrolytic aluminium carbon.

Ngokwezinga lokushisa lokwelapha ukushisa, i-petroleum coke ingahlukaniswa ngezinhlobo ezimbili: i-coke eluhlaza kanye ne-coke e-calcined. I-coke yangaphambili ye-petroleum etholwe ekubambezelekeni kokupheka iqukethe izinto eziningi eziguquguqukayo futhi inamandla aphansi emishini. I-coke e-calcined itholakala ngokubala. Iningi lezindawo zokuhlanza e-China zikhiqiza i-coke eluhlaza kuphela, futhi imisebenzi eminingi yokubala yenziwa ezitshalweni zekhabhoni.

I-petroleum coke ingahlukaniswa ibe yi-coke ephezulu yesibabule (equkethe ngaphezu kuka-1.5% isulfure), i-coke yesibabule esiphakathi (equkethe u-0.5% -1.5% sulphur), kanye ne-coke yesulfure ephansi (equkethe ngaphansi kuka-0.5% isulfure) izinhlobo ezintathu, ama-electrode e-graphite neminye imikhiqizo yokwenziwa ye-graphite yokwenziwa ngokuvamile isebenzisa imikhiqizo ye-sulfure ephansi.

I-needle coke iwuhlobo lwe-coke yekhwalithi ephezulu enokwakheka okusobala kwe-fibrous, ikakhulukazi i-coefficient ephansi yokwandisa okushisayo kanye ne-graphitization elula. Lapho i-coke block iphuka, ingahlukaniswa ibe yizinhlayiya ze-strip ezacile ngokuya ngokuthungwa (i-aspect ratio ngokuvamile ingaphezulu kuka-1.75), futhi isakhiwo se-anisotropic fibrous singabonwa ngaphansi kwe-polarized light microscope, ngakho-ke ibizwa ngokuthi i-needle coke.

I-anisotropy engokomzimba neyomshini ye-coke yenaliti isobala kakhulu, futhi ine-conductivity enhle kagesi neyokushisa ehambisana ne-axis ende yezinhlayiya, futhi i-coefficient yokwandisa ukushisa iphansi. Ngesikhathi sokubunjwa kwe-extrusion, i-axis ende yezinhlayiya eziningi ihlelwe ngokuvumelana nesiqondiso se-extrusion. Ngakho-ke, i-coke yenaliti iwukhiye obalulekile wokukhiqiza amandla aphezulu noma ama-electrode e-graphite aphezulu, anokumelana okuphansi, i-coefficient encane yokwanda okushisayo kanye nokumelana nokushaqeka okuhle kokushisa.

I-needle coke ihlukaniswe nge-oyela yenaliti ye-coke ekhiqizwa kuzinsalela ze-petroleum kanye ne-coke yenaliti yamalahle ekhiqizwa kusuka ku-asphalt yamalahle acwengisisiwe.

I-Coal tar pitch ingenye yemikhiqizo eyinhloko yokucubungula okujulile kwetiyela lamalahle. Kuyingxube yezinhlobonhlobo zama-hydrocarbons, i-viscosity emnyama ephezulu i-semi-solid noma eqinile ekamelweni lokushisa, ngaphandle kwendawo yokuncibilika engaguquki, ethambile ngemva kokushisa, bese iyancibilika, ngobuningi obuyi-1.25-1.35g/cm3. Ngokusho iphuzu layo ukuthambisa ihlukaniswe izinga lokushisa eliphansi, okusesilinganisweni futhi izinga lokushisa eliphezulu asphalt izinhlobo ezintathu. Isivuno se-asphalt yokushisa okuphakathi singama-54-56% wetiyela lamalahle. Ukwakhiwa kwe-pitch yamalahle kuyinkimbinkimbi kakhulu, ehlobene nempahla ye-tare yamalahle kanye nokuqukethwe kwama-heteroatoms, futhi iphinde ithinteke ohlelweni lwenqubo yokupheka kanye nezimo zokucubungula i-tar yamalahle. Kukhona izinkomba eziningi ezibonisa izici ze-pitch yamalahle, njenge-asphalt softening point, i-toluene engancibilikiyo (TI), i-quinoline insoluble (QI), inani le-coking kanye nezakhiwo ze-rheological ze-pitch yamalahle.

I-pitch yamalahle isetshenziswa njenge-binder kanye ne-ejenti yokumithisa embonini yekhabhoni, futhi izakhiwo zayo zinethonya elikhulu enqubweni yokukhiqiza kanye nekhwalithi yomkhiqizo wemikhiqizo yekhabhoni. I-binder asphalt ngokuvamile isebenzisa izinga lokushisa eliphakathi nendawo noma izinga lokushisa eliphakathi nendawo eliguquliwe elinephuzu lokuthambisa elimaphakathi, inani eliphakeme lokuphekwa kanye ne-beta resin ephezulu, futhi i-ejenti yokumilisela kufanele isebenzise i-asphalt yokushisa ephakathi nendawo enephuzu eliphansi lokuthambisa, i-QI ephansi kanye ne-rheology enhle.