Cov khoom siv raw thiab kev tsim khoom ntawm graphite electrode
Graphite electrode yog kub resistant graphite conductive khoom tsim los ntawm roj av knead, koob coke li aggregate thiab thee bitumen li binder, uas yog tsim los ntawm ib tug series ntawm cov txheej txheem xws li kneading, molding, roasting, impregnation, graphitization thiab mechanical processing. khoom.
Cov graphite electrode yog ib qho tseem ceeb ntawm high-temperature conductive khoom rau hluav taws xob steelmaking. Lub graphite electrode yog siv los nkag rau hluav taws xob hluav taws xob rau hluav taws xob rau hluav taws xob, thiab qhov kub siab uas tsim los ntawm qhov chaw nruab nrab ntawm cov electrode kawg thiab tus nqi yog siv los ua qhov cua sov kom yaj cov nqi rau cov hlau ua. Lwm cov ore furnaces uas smelt cov ntaub ntawv xws li daj phosphorus, industrial silicon, thiab abrasives kuj siv graphite electrodes ua cov ntaub ntawv conductive. Qhov zoo tshaj plaws thiab tshwj xeeb ntawm lub cev thiab tshuaj lom neeg ntawm graphite electrodes kuj tau siv dav hauv lwm qhov chaw lag luam.
Cov khoom siv raw rau kev tsim cov graphite electrodes yog roj av coke, koob coke thiab thee tar pitch.
Petroleum coke yog cov khoom siv hluav taws xob uas tau txais los ntawm coking thee residue thiab petroleum pitch. Cov xim yog xim dub thiab ntxeem tau, lub ntsiab tseem ceeb yog carbon, thiab cov ntsiab lus tshauv tsawg heev, feem ntau qis dua 0.5%. Petroleum coke belongs rau chav kawm ntawm graphitized yooj yim carbon. Petroleum coke muaj ntau yam kev siv hauv kev lag luam chemical thiab metallurgical. Nws yog cov khoom siv tseem ceeb rau kev tsim cov khoom siv graphite thiab cov khoom siv carbon rau electrolytic aluminium.
Cov roj av coke tuaj yeem muab faib ua ob hom: coke nyoos thiab calcined coke raws li kev kho cua sov. Lub qub roj av coke tau los ntawm ncua coking muaj ib tug loj npaum li cas ntawm volatiles, thiab cov neeg kho tshuab lub zog yog tsawg. Lub calcined coke yog tau los ntawm calcination ntawm raw coke. Feem ntau cov refineries nyob rau hauv Tuam Tshoj tsuas yog tsim coke, thiab calcination ua hauj lwm feem ntau yog ua nyob rau hauv cov nroj tsuag carbon.
Petroleum coke tuaj yeem muab faib ua cov coke siab sulfur (muaj ntau dua 1.5% sulfur), nruab nrab sulfur coke (muaj 0.5% -1.5% sulfur), thiab qis sulfur coke (muaj tsawg dua 0.5% sulfur). Kev tsim cov graphite electrodes thiab lwm yam khoom siv graphite feem ntau yog tsim los siv cov coke uas tsis muaj sulfur.
Koob coke yog ib hom zoo coke nrog pom tseeb fibrous kev ntxhib los mos, tsis tshua muaj thermal expansion coefficient thiab yooj yim graphitization. Thaum cov coke tawg lawm, nws tuaj yeem muab faib ua cov strips me me raws li 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 tshuab ntsuas polarizing, thiab yog li hu ua rab koob coke.
Lub anisotropy ntawm physico-mechanical zog ntawm koob coke yog pom tseeb heev. Nws muaj cov hluav taws xob zoo thiab thermal conductivity sib npaug rau qhov ntev axis kev taw qhia ntawm cov khoom, thiab cov coefficient ntawm thermal expansion yog tsawg. Thaum extrusion molding, ntev axis ntawm feem ntau hais yog teem nyob rau hauv lub extrusion kev taw qhia. Yog li, koob coke yog cov khoom siv tseem ceeb rau kev tsim hluav taws xob siab lossis ultra-high-power graphite electrodes. Cov graphite electrode uas ua tau muaj qhov tsis muaj zog, me me thermal expansion coefficient thiab zoo thermal shock kuj.
Needle coke yog muab faib ua roj-raws li koob coke ua los ntawm roj av residue thiab thee-based koob coke ua los ntawm refined thee pitch raw khoom.
Coal tar yog ib qho ntawm cov khoom tseem ceeb ntawm thee tar sib sib zog nqus ua. Nws yog ib tug sib tov ntawm ntau yam hydrocarbons, dub nyob rau hauv high kub, semi-khoom los yog khoom ntawm high kub, tsis ruaj melting point, softened tom qab cua sov, thiab ces melted, nrog ib tug ceev ntawm 1.25-1.35 g / cm3. Raws li nws cov ntsiab lus softening, nws muab faib ua qhov kub thiab txias, nruab nrab kub thiab kub asphalt. Qhov nruab nrab kub asphalt tawm los yog 54-56% ntawm cov thee tar. Qhov sib xyaw ntawm thee tar 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 cov cim qhia rau tus cwj pwm thee tar suab, xws li bitumen softening point, toluene insolubles (TI), quinoline insolubles (QI), coking values, thiab thee pitch rheology.
Coal tar 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. Lub binder asphalt feem ntau siv qhov nruab nrab-kub lossis nruab nrab-kub hloov asphalt uas muaj qhov nruab nrab softening point, tus nqi coking siab, thiab siab β resin. Tus neeg sawv cev impregnating yog qhov nruab nrab kub asphalt uas muaj qhov muag muag qis, qis QI, thiab cov khoom zoo rheological.
Post lub sij hawm: Sep-23-2019