Izinto zokusetshenziswa zokukhiqiza ama-electrode e-graphite yi-petroleum coke, i-needle coke kanye ne-coal pitch

I-petroleum coke iwumkhiqizo oqinile ovuthayo otholakala ku-petroleum residue kanye ne-petroleum asphalt ngokuyipheka. Umbala umnyama futhi unezimbobo, into eyinhloko yi-carbon, kanti okuqukethwe komlotha kuphansi kakhulu, ngokuvamile kungaphansi kuka-0.5%. I-petroleum coke iwuhlobo lwe-carbon elula eyenziwe nge-graphitized, i-petroleum coke inokusetshenziswa okubanzi embonini yamakhemikhali, i-metallurgy kanye neminye imboni, futhi iyinto eluhlaza eyinhloko yokukhiqizwa kwemikhiqizo ye-graphite yokwenziwa kanye nemikhiqizo ye-carbon ye-aluminium electrolytic.

Ngokwezinga lokushisa lokwelashwa kokushisa, i-petroleum coke ingahlukaniswa ngezinhlobo ezimbili: i-coke eluhlaza kanye ne-coke e-calcined. I-coke yangaphambili ye-petroleum etholakala ekuphekeni okuphuzile iqukethe okuqukethwe okuningi okuguquguqukayo futhi inamandla amancane okusebenza. I-coke e-calcined itholakala ngokuphekwa kwe-calcium. Izindawo eziningi zokuhluza eShayina zikhiqiza i-coke eluhlaza kuphela, futhi imisebenzi eminingi yokuphekwa kwe-calcium yenziwa ezitshalweni ze-carbon.

I-coke kaphethiloli ingahlukaniswa ibe yi-coke yesulfure ephezulu (equkethe i-sulfure engaphezu kuka-1.5%), i-coke yesulfure ephakathi (equkethe i-sulfure engu-0.5%-1.5%), kanye ne-coke yesulfure ephansi (equkethe i-sulfure engaphansi kuka-0.5%), ama-electrode e-graphite kanye neminye imikhiqizo ye-graphite yokwenziwa ngokuvamile isebenzisa ukukhiqizwa kwe-coke yesulfure ephansi.

I-Needle coke uhlobo lwe-coke esezingeni eliphezulu enokwakheka okusobala kwe-fibrous, ikakhulukazi i-coefficient yokukhulisa ukushisa ephansi kanye ne-graphitization elula. Lapho i-coke block iphuka, ingahlukaniswa ibe yizinhlayiya ezincane zomcu ngokuya ngokuthungwa (isilinganiso se-aspect ngokuvamile singaphezu kuka-1.75), futhi isakhiwo se-anisotropic fibrous singabonakala ngaphansi kwe-microscope yokukhanya e-polarized, ngakho-ke ibizwa ngokuthi i-needle coke.

I-anisotropy engokomzimba neyemishini ye-needle coke isobala kakhulu, futhi inomoya omuhle kagesi nowokushisa ohambisana ne-axis ende yezinhlayiya, futhi i-coefficient yokwanda kokushisa iphansi. Ngesikhathi sokubumba i-extrusion, i-axis ende yezinhlayiya eziningi ihlelwe ngokwesiqondiso se-extrusion. Ngakho-ke, i-needle coke iyinto eluhlaza eyisihluthulelo yokukhiqiza ama-electrode e-graphite anamandla aphezulu noma aphezulu kakhulu, anokumelana okuphansi, i-coefficient encane yokwanda kokushisa kanye nokumelana okuhle kokushaqeka kokushisa.

I-Needle coke ihlukaniswe nge-oyili ye-needle coke ekhiqizwa kusuka ku-petroleum residue kanye ne-coke ye-needle coke yamalahle ekhiqizwa kusuka ku-asphalt yamalahle ehlanjululwe kahle.

I-coal tar pitch ingenye yemikhiqizo eyinhloko yokucubungula i-coal tar deep. Iyingxube yezinhlobo ezahlukene zama-hydrocarbon, i-black high viscosity semi-solid noma i-solid ekushiseni kwegumbi, ngaphandle kwe-fixed melting point, ithanjiswe ngemva kokushisa, bese incibilikiswa, ngobuningi obungu-1.25-1.35g/cm3. Ngokusho kwe-softening point yayo ihlukaniswe ngezinhlobo ezintathu ze-asphalt ezisezingeni eliphansi, ezisezingeni eliphakathi kanye nezisezingeni eliphezulu. Isivuno se-asphalt esisezingeni eliphakathi singama-54-56% we-coal tar. Ukwakheka kwe-coal pitch kuyinkimbinkimbi kakhulu, okuhlobene ne-property ye-coal tar kanye nokuqukethwe kwama-heteroatom, futhi kuthinteka nohlelo lwenqubo ye-coking kanye nezimo zokucubungula ze-coal tar. Kunezinhlu eziningi ezichaza izakhiwo ze-coal pitch, njenge-asphalt softening point, i-toluene insoluble (TI), i-quinoline insoluble (QI), inani le-coking kanye nezakhiwo ze-rheological ze-coal pitch.

I-coal pitch isetshenziswa njenge-binder kanye ne-inpregnating agent embonini yekhabhoni, futhi izakhiwo zayo zinethonya elikhulu enqubweni yokukhiqiza kanye nekhwalithi yomkhiqizo wemikhiqizo yekhabhoni. I-binder asphalt ngokuvamile isebenzisa i-asphalt eguquliwe yokushisa okuphakathi noma okuphakathi enephuzu lokuthambisa elimaphakathi, inani eliphezulu lokubilisa kanye ne-beta resin ephezulu, kanti i-inpregnation agent kufanele isebenzise i-asphalt yokushisa okuphakathi enephuzu lokuthambisa eliphansi, i-QI ephansi kanye ne-rheology enhle.