Cov khoom siv raw rau graphite ntau lawm

Cov khoom siv raw rau graphite ntau lawm

Petroleum coke yog ib yam khoom uas combustible tau los ntawm coking petroleum residue thiab petroleum pitch. Cov xim yog xim dub thiab ntxeem tau, lub ntsiab tseem ceeb yog carbon, thiab cov hmoov tshauv tsawg heev, feem ntau hauv qab no 0.5 feem pua. Petroleum coke belongs rau qeb ntawm yooj yim graphitized carbon. Petroleum coke yog dav siv hauv tshuaj, metallurgical thiab lwm yam lag luam. Nws yog cov khoom siv tseem ceeb rau kev tsim cov khoom siv graphite thiab cov khoom siv carbon rau electrolytic aluminium.

Petroleum coke tuaj yeem muab faib ua coke ntsuab thiab calcined coke raws li kev kho cua sov. Cov qub yog cov roj av coke tau los ntawm kev ncua coking, uas muaj cov teeb meem loj heev thiab muaj zog txhua yam. Calcined coke yog tau los ntawm calcining ntsuab coke. Feem ntau cov roj refineries hauv Suav teb tsuas yog tsim cov coke, thiab feem ntau ntawm cov haujlwm calcination yog ua nyob rau hauv cov nroj tsuag carbon.

Petroleum coke yog cais raws li qib ntawm sulfur cov ntsiab lus. Nws tuaj yeem muab faib ua peb hom: high-sulfur coke (cov ntsiab lus sulfur siab tshaj 1.5 feem pua), nruab nrab-sulfur coke (cov ntsiab lus sulfur 0.5 feem pua ​​-1.5%), thiab qis sulfur coke (cov ntsiab lus sulfur hauv qab no 0.5 feem pua ​​). Kev tsim cov khoom siv graphite feem ntau yog siv cov khoom siv qis sulfur coke.

Koob coke yog ib hom zoo coke nrog pom tseeb fibrous kev ntxhib los mos, thermal expansion coefficient thiab yooj yim graphitization. Thaum cov coke tawg lawm, nws tuaj yeem faib ua elongated hais raws li qhov kev ntxhib los mos (qhov sib piv feem ntau yog siab dua 1.75). Ib qho anisotropic fibrous qauv tuaj yeem pom nyob rau hauv lub teeb pom kev zoo polarized, yog li nws hu ua koob coke.

Lub anisotropy ntawm lub cev thiab txhua yam khoom ntawm koob coke yog pom tseeb heev. Nws muaj cov hluav taws xob zoo thiab thermal conductivity thaum uas tig mus rau qhov ntev axis ntawm cov khoom, thiab muaj cov thermal expansion coefficient tsawg. Thaum lub sij hawm extrusion molding, feem ntau ntawm cov axes ntev ntawm cov khoom yog teem rau hauv cov kev taw qhia extrusion. Yog li ntawd, koob coke yog cov khoom siv tseem ceeb rau kev tsim cov graphite. Cov khoom tsim graphite muaj qhov tsis muaj zog, tsis tshua muaj thermal expansion coefficient thiab zoo thermal shock kuj.

Koob coke yog muab faib ua roj av-raws li koob coke uas ua nrog roj av residue raws li raw khoom thiab thee-raws li koob coke ua nrog refined thee pitch raw khoom.

Coal pitch yog ib qho ntawm cov khoom tseem ceeb ntawm thee tar sib sib zog nqus ua. Nws yog kev sib xyaw ntawm ntau yam hydrocarbons. Nws yog ib tug dub high-viscosity semi-khoom los yog khoom nyob rau hauv chav tsev kub. Nws tsis muaj qhov ntsuas kub ruaj khov. Nws softens tom qab cua sov thiab ces melts. Qhov ceev yog 1.25-1.35g/cm3. Raws li nws cov ntsiab lus softening, nws tuaj yeem muab faib ua qhov kub thiab txias, nruab nrab kub thiab kub asphalt. Cov txiaj ntsig ntawm qhov nruab nrab kub pitch yog 54-56 feem pua ​​​​ntawm cov thee tar. Qhov sib xyaw ntawm thee tar pitch yog qhov nyuaj heev, uas muaj feem xyuam rau cov khoom ntawm thee tar thiab cov ntsiab lus ntawm heteroatoms, thiab tseem cuam tshuam los ntawm cov txheej txheem coking thiab coal tar ua tej yam kev mob. Muaj ntau qhov ntsuas uas qhia txog cov yam ntxwv ntawm cov thee pitch, xws li pitch softening point, toluene insoluble matter (TI), quinoline insoluble matter (QI), coking value, and the coal pitch rheology.

Coal pitch yog siv los ua ib qho kev khi thiab impregnant hauv kev lag luam carbon, thiab nws qhov kev ua tau zoo muaj kev cuam tshuam zoo rau cov txheej txheem tsim khoom thiab cov khoom zoo ntawm cov khoom siv carbon. Binder asphalt feem ntau siv nruab nrab kub los yog nruab nrab kub hloov asphalt nrog nruab nrab softening point, siab coking nqi, thiab siab resin. Raws li impregnant, siv nruab nrab kub asphalt nrog qis softening point, qis QI, thiab zoo rheological zog.

Calcining: Cov khoom siv carbonaceous yog cov khoom siv kub-kho ntawm qhov kub thiab txias kom tso tawm cov dej noo thiab cov teeb meem tsis zoo, thiab ua kom zoo dua qub kev ua noj ua haus ntawm cov txheej txheem tsim khoom hu ua calcination. Feem ntau, carbonaceous raw cov ntaub ntawv yog calcined siv roj roj thiab lawv tus kheej volatile teeb meem raws li lub tshav kub qhov chaw, thiab qhov siab tshaj plaws kub yog 1250-1350 degree .

Calcining ua rau muaj kev hloov pauv ntawm cov qauv thiab tshuaj lom neeg ntawm cov tshuaj loj, txhim kho cov tshuaj sib xyaw, thiab tso lub hauv paus rau cov txheej txheem tom ntej .

Cov khoom siv calcination feem ntau suav nrog tank calciner, rotary kiln thiab hluav taws xob calciner. Lub calcination zoo tswj Performance index yog hais tias qhov tseeb ceev ntawm roj av coke yog tsis tsawg tshaj li 2.07g / cm3, lub resistivity tsis ntau tshaj 550μΩ.m, qhov tseeb ceev ntawm koob coke yog tsis tsawg tshaj li 2.12g / cm3, thiab cov resistivity. tsis ntau tshaj 500μΩ.m.