I-petroleum coke yimveliso eqinileyo enokutsha efunyenwe kwi-petroleum residue kunye ne-petroleum asphalt ngokuyicola. Umbala umnyama kwaye unemingxuma, into ephambili yi-carbon, kwaye umxholo womlotha uphantsi kakhulu, ngokubanzi ungaphantsi kwe-0.5%. I-petroleum coke luhlobo lwe-carbon elula eyenziwe nge-graphitized, i-petroleum coke inoluhlu olubanzi lokusetyenziswa kushishino lweekhemikhali, i-metallurgy kunye neminye imboni, kwaye yeyona nto iphambili yokwenza imveliso yeemveliso ze-graphite zokwenziwa kunye neemveliso ze-aluminium carbon ze-electrolytic.
Ngokweqondo lobushushu bonyango lobushushu, i-petroleum coke inokwahlulwa ibe ziintlobo ezimbini: i-coke eluhlaza kunye ne-calcined coke. I-coke yangaphambili ye-petroleum efunyenwe kwi-delayed coking iqulethe umxholo omninzi oguquguqukayo kwaye inamandla amancinci oomatshini. I-coke e-calcined ifunyanwa nge-calcination. Uninzi lweendawo zokuhluza eTshayina zivelisa i-coke eluhlaza kuphela, kwaye uninzi lwemisebenzi ye-calcination yenziwa kwizityalo ze-carbon.
I-coke yepetroliyam inokwahlulwa ibe yi-coke yesulfure ephezulu (equlethe i-sulfure engaphezulu kwe-1.5%), i-coke yesulfure ephakathi (equlethe i-sulfure eyi-0.5%-1.5%), kunye ne-coke yesulfure ephantsi (equlethe i-sulfure engaphantsi kwe-0.5%), ii-electrode ze-graphite kunye nezinye iimveliso ze-graphite zokwenziwa ngokubanzi zisebenzisa imveliso ye-coke yesulfure ephantsi.
I-Needle coke luhlobo lwe-coke ekumgangatho ophezulu ene-fibrous texture ecacileyo, ingakumbi i-thermal expansion coefficient ephantsi kunye ne-graphitization elula. Xa i-coke block iphuka, inokwahlulwa ibe ngamasuntswana amancinci ngokwe-texture (umlinganiselo we-aspect ngokubanzi ungaphezulu kwe-1.75), kwaye isakhiwo se-anisotropic fibrous sinokubonwa phantsi kwe-polarized light microscope, ngoko ke ibizwa ngokuba yi-needle coke.
I-anisotropy yomzimba neye-mechanical ye-needle coke icacile kakhulu, kwaye ine-conductivity entle yombane kunye ne-thermal ehambelana ne-axis ende yee-particles, kwaye i-coefficient yokwandiswa kobushushu iphantsi. Ngexesha lokubumba i-extrusion, i-axis ende yee-particles ezininzi icwangciswa ngokwendlela ye-extrusion. Ke ngoko, i-needle coke sisixhobo esibalulekileyo sokwenza ii-electrode ze-graphite ezinamandla aphezulu okanye aphezulu kakhulu, ezine-resistivity ephantsi, i-coefficient encinci yokwandiswa kobushushu kunye nokumelana okuhle kobushushu.
I-Needle coke yahlulwe yaba yi-oil needle coke eveliswa yi-petroleum residue kunye ne-coke yeenaliti zamalahle eveliswa yi-asphalt yamalahle ecoliweyo.
I-coal tar pitch yenye yezona mveliso ziphambili zokucubungula i-coal tar deep. Ngumxube wee-hydrocarbons ezahlukeneyo, i-black high viscosity semi-solid okanye i-solid kubushushu begumbi, ngaphandle kwe-fixed melting point, ithanjiswe emva kobushushu, ize inyibilike, ngobuninzi be-1.25-1.35g/cm3. Ngokwe-softening point yayo yahlulwe yaba ziintlobo ezintathu ze-asphalt eziphantsi kobushushu, eziphakathi kunye ne-high temperature asphalt. Isivuno se-asphalt esiphakathi kubushushu yi-54-56% ye-coal tar. Ukwakheka kwe-coal pitch kuyinkimbinkimbi kakhulu, oku kunxulumene nepropathi ye-coal tar kunye nomxholo we-heteroatom, kwaye kuchaphazeleka nenkqubo yenkqubo ye-coking kunye neemeko zokucubungula i-coal tar. Kukho ii-indexes ezininzi ezichaza iipropathi ze-coal pitch, ezifana ne-asphalt softening point, i-toluene insoluble (TI), i-quinoline insoluble (QI), ixabiso le-coking kunye nepropathi ye-rheological ye-coal pitch.
I-Coal pitch isetyenziswa njenge-binder kunye ne-inpregnating agent kwishishini le-carbon, kwaye iipropati zayo zinempembelelo enkulu kwinkqubo yemveliso kunye nomgangatho wemveliso yeemveliso ze-carbon. I-binder asphalt ngokubanzi isebenzisa i-asphalt eguquliweyo yobushushu obuphakathi okanye obuphakathi ene-softening point ephakathi, ixabiso eliphezulu le-coking kunye ne-beta resin ephezulu, kwaye i-impregnation agent kufuneka isebenzise i-asphalt yobushushu obuphakathi ene-softening point ephantsi, i-QI ephantsi kunye ne-rheology elungileyo.
Ixesha leposi: Feb-07-2025