Needle coke mea he kala-hina porous paʻa me ka maopopo fiber kikokiko kuhikuhi, a loaʻa i nā 'ano o ka kiʻekiʻe crystallinity, kiʻekiʻe ikaika, kiʻekiʻe graphitization, haʻahaʻa thermal hoʻonui, haʻahaʻa ablation, etc. he mea waiwai kiʻekiʻe no ka hana ʻana i nā electrodes graphite, nā mea anode pākaukau a me nā huahana kalapona kiʻekiʻe.

E like me ka hana ʻokoʻa o nā mea maka i hoʻohana ʻia, hiki ke hoʻokaʻawale ʻia ka ʻaila coke i ʻelua mau ʻano: ka aila a me ka lanahu: ʻo ka nila coke i hana ʻia mai nā huahana hoʻomaʻemaʻe ʻaila i kapa ʻia ʻo ka ʻaila coke, a me ka lanahu tar pitch a me kāna mau hakina Needle coke i hua ʻia mai ka ʻaila mai, ua kapa ʻia ʻo coke nilalahu.ʻO ka hana ʻana i ka coke needle me nā huahana petroleum he mau pono palekana kaiapuni koʻikoʻi, a ʻoi aku ka paʻakikī o ka hoʻokō ʻana a haʻahaʻa ke kumukūʻai hana, no laila ua uku nui ʻia e ka poʻe.

Hiki ke hoʻokaʻawale ʻia i ʻelua ʻano o ka coke nilala ʻaila: coke maka a me ka coke i kuke ʻia (calcined coke).Ma waena o lākou, hoʻohana ʻia ka coke maka no ka hana ʻana i nā mea electrode maikaʻi ʻole o ka pākaukau, a hoʻohana ʻia ka coke kuke e hana i nā electrodes graphite kiʻekiʻe.I nā makahiki i hala iho nei, me ka ulu nui o ke kūlana palekana kaiapuni, ʻo ka hoʻomohala wikiwiki ʻana o nā kaʻa ikehu hou ua alakaʻi i kahi koi kiʻekiʻe no nā mea anode pākaukau;i ka manawa like, ua hoʻololi ʻia nā mea hoʻololi kahiko o nā hui kila e nā umu uila.Ma lalo o nā hopena ʻelua, ua piʻi nui ka noi o ka mākeke no ka coke needle.I kēia manawa, ʻoi aku ka nui o ka hana ʻaila coke ma ka honua e nā hui ʻAmelika, a he mau hui liʻiliʻi wale nō e like me Jinzhou Petrochemical, Jingyang Petrochemical a me Yida New Materials i hoʻokō i ka hana paʻa i koʻu ʻāina.Ke hilinaʻi nui nei nā huahana coke needle kiʻekiʻe i ka lawe ʻia mai.ʻAʻole wale ka nui o ke kālā i hoʻopau wale ʻia, akā ua maʻalahi pū kekahi.He koʻikoʻi koʻikoʻi koʻikoʻi ka wikiwiki o ka noiʻi ʻana i ke kaʻina hana o ka nila coke a hoʻomaopopo i ka jacking up me ka hana ʻana i ka hiki.

ʻO ka mea maka ke kumu nui e pili ana i ka maikaʻi o ka coke needle.Hiki i nā mea maka kūpono ke hoʻemi nui i ka paʻakikī o ka hoʻokumu ʻana i ka mesophase pitch a hoʻoneʻe i nā kumu paʻa ʻole.Pono nā mea maka no ka hana ʻana i ka coke needle i kēia mau ʻano:

①He kiʻekiʻe ka maʻiʻo o nā mea ʻala, ʻoi aku ka maikaʻi o ka ʻike o 3 a me 4-rings short side chain aromatics ma ka hoʻonohonoho laina ʻoi aku ka maikaʻi o 40% a 50%.Ma kēia ala, i ka wā o ka carbonization, hoʻopili ʻia nā molekole aromatics me kekahi i kekahi e hana i nā molekole planar aromatics nui aʻe, a ma o ka nui.π Hoʻopili ʻia nā ao electron i hoʻopaʻa ʻia ma luna o kekahi i kekahi e hana i kahi lattice like me ka graphite piha piha.

②ʻO nā aspaltene a me nā colloids i loko o ka molecular structure of fused-ring large aromatic hydrocarbons he haʻahaʻa ka ʻike.Loaʻa i kēia mau mea i ka polarity molecular ikaika a me ka reactivity kiʻekiʻe., He mea ma'amau e koi 'ia ka mea hiki ole ke ho'ohehe'e heptane ma lalo o 2%.

③ʻAʻole ʻoi aku ka nui o ka sulfur ma mua o 0.6%, a ʻaʻole ʻoi aku ka nui o ka nitrogen ma mua o 1%.He mea maʻalahi ka sulfur a me ka nitrogen ma muli o ke kiʻekiʻe o ka wela i ka wā o ka hana ʻana o nā electrodes a hoʻoulu i ka pehu kinoea, kahi e hoʻohālua ai i nā electrodes.

④He emi iho ka lehu ma lalo o 0.05%, a ʻaʻohe mea ʻino mechanical e like me ka pauka catalyst, kahi e hoʻomaka ai ka wikiwiki i ka wā carbonization, hoʻonui i ka paʻakikī o ka hana ʻana i nā spheres mesophase, a pili i nā waiwai o ka coke.

⑤ʻO ka maʻiʻo o nā metala koʻikoʻi e like me vanadium a me nickel he emi ma mua o 100ppm, no ka mea, ʻo nā pūhui i haku ʻia o kēia mau metala he hopena catalytic, kahi e hoʻolalelale ai i ka nucleation o nā spheres mesophase, a paʻakikī i nā spheres e ulu pono.I ka manawa like, ʻo ka loaʻa ʻana o kēia mau mea haumia metala i loko o ka huahana e kumu hoʻi i nā hemahema, nā pilikia e like me nā māwae e alakaʻi i ka emi ʻana o ka ikaika o ka huahana.

⑥ʻO Quinoline insoluble matter (QI) he zero, e hoʻopili ʻia ʻo QI a puni ka mesophase, ke keʻakeʻa nei i ka ulu ʻana a me ka hui ʻana o nā kristal spherical, a ʻaʻole hiki ke loaʻa ke ʻano coke needle me ka hale fiber maikaʻi ma hope o ka coking.

⑦ʻOi aku ka nui ma mua o 1.0g/cm3 e hōʻoia i ka loaʻa ʻana o ka coke.

ʻO kaʻoiaʻiʻo, he mea kakaikahi nā aila hānai e kū ana i nā koi i luna.Mai ka hiʻohiʻona o nā ʻāpana, catalytic cracking oil slurry me nā mea ʻono kiʻekiʻe, furfural extracted aila, a me ka ethylene tar he mau mea waiwai maikaʻi loa ia no ka hana ʻana i ka nila.ʻO Catalytic cracking oil slurry kekahi o nā huahana o ka hui catalytic, a ʻo ia ka mea maʻamau i hoʻouna ʻia e like me ka aila wahie makamae.Ma muli o ka nui o nā mea ʻono i loko o ia mea, he mea waiwai kiʻekiʻe ia no ka hana ʻana i ka coke needle ma ke ʻano o ka haku mele.ʻOiaʻiʻo, ma ka honua holoʻokoʻa Ua hoʻomākaukau ʻia ka hapa nui o nā huahana coke mai ka catalytic cracking oil slurry.