Cov txheej txheem tsim cov graphite electrode

Cov khoom siv raw thiab cov txheej txheem tsim khoom ntawm graphite electrode

Graphite electrode yog cov khoom siv graphite uas tiv taus kub siab uas tsim los ntawm roj av sib xyaw, koob coke ua cov khoom sib xyaw thiab thee bitumen ua cov khoom siv khi, uas tau tsim los ntawm ntau yam txheej txheem xws li sib xyaw, molding, roasting, impregnation, graphitization thiab kev ua khoom siv.

Lub graphite electrode yog ib qho khoom siv hluav taws xob kub heev uas siv hluav taws xob ua hlau. Lub graphite electrode siv los muab hluav taws xob rau hauv lub cub hluav taws xob, thiab qhov kub siab uas tsim los ntawm lub arc ntawm qhov kawg ntawm lub electrode thiab lub nqi siv los ua qhov chaw cua sov los yaj lub nqi rau kev ua hlau. Lwm lub cub hluav taws xob uas yaj cov khoom xws li daj phosphorus, kev lag luam silicon, thiab abrasives kuj siv graphite electrodes ua cov khoom siv hluav taws xob. Cov khoom siv lub cev thiab tshuaj lom neeg zoo heev thiab tshwj xeeb ntawm graphite electrodes kuj siv dav hauv lwm qhov kev lag luam.

Cov ntaub ntawv raw rau kev tsim cov graphite electrodes yog roj av coke, koob coke thiab thee tar pitch.

Petroleum coke yog cov khoom khov uas yooj yim hlawv tau los ntawm kev siv coking thee thiab roj av pitch. Xim yog dub thiab porous, lub ntsiab lus tseem ceeb yog carbon, thiab cov tshauv tsawg heev, feem ntau qis dua 0.5%. Petroleum coke yog cov pa roj carbon uas yooj yim graphitized. Petroleum coke muaj ntau yam kev siv hauv kev lag luam tshuaj lom neeg thiab hlau. Nws yog cov khoom siv tseem ceeb rau kev tsim cov khoom graphite dag thiab cov khoom carbon rau electrolytic aluminium.

Cov roj av coke muaj peev xwm muab faib ua ob hom: cov roj av coke nyoos thiab cov roj av calcined raws li qhov kub ntawm kev kho cua sov. Cov roj av coke yav dhau los tau los ntawm kev ncua coking muaj ntau cov volatiles, thiab lub zog kho tshuab qis. Cov roj av coke calcined tau los ntawm kev calcination ntawm cov roj av coke nyoos. Feem ntau cov chaw ua roj hauv Suav teb tsuas yog tsim cov coke xwb, thiab kev ua haujlwm calcination feem ntau yog ua tiav hauv cov nroj tsuag carbon.

Petroleum coke muaj peev xwm muab faib ua cov coke sulfur siab (muaj ntau dua 1.5% sulfur), coke sulfur nruab nrab (muaj 0.5% -1.5% sulfur), thiab coke sulfur qis (muaj tsawg dua 0.5% sulfur). Kev tsim cov graphite electrodes thiab lwm yam khoom siv graphite cuav feem ntau yog tsim los ntawm kev siv cov coke sulfur qis.

Koob coke yog ib hom coke zoo nrog cov qauv fibrous pom tseeb, cov coefficient nthuav dav thermal qis heev thiab yooj yim graphitization. Thaum lub coke tawg, nws tuaj yeem faib ua cov kab nyias nyias raws li cov qauv (qhov sib piv feem ntau yog siab dua 1.75). Ib qho qauv fibrous anisotropic tuaj yeem pom nyob rau hauv lub tshuab microscope polarizing, thiab yog li ntawd hu ua koob coke.

Qhov anisotropy ntawm cov khoom siv physico-mechanical ntawm koob coke yog qhov pom tseeb heev. Nws muaj cov hluav taws xob zoo thiab thermal conductivity sib luag rau qhov ntev ntawm cov khoom me me, thiab cov coefficient ntawm thermal expansion qis. Thaum extrusion molding, qhov ntev ntawm feem ntau cov khoom me me yog teeb tsa hauv qhov kev taw qhia extrusion. Yog li ntawd, koob coke yog cov khoom siv tseem ceeb rau kev tsim cov electrodes graphite siab lossis ultra-high-power. Cov graphite electrode tsim tawm muaj qhov tsis kam qis, cov coefficient nthuav dav thermal me me thiab kev tiv thaiv thermal zoo.

Cov tshuaj coke koob yog muab faib ua cov roj uas ua los ntawm cov roj av thiab cov tshuaj coke koob uas ua los ntawm cov thee uas ua los ntawm cov khoom siv raw ntawm cov thee.

Cov thee tar yog ib qho ntawm cov khoom tseem ceeb ntawm kev ua cov thee tar tob. Nws yog kev sib xyaw ntawm ntau yam hydrocarbons, dub ntawm qhov kub siab, semi-khoom lossis khoom ntawm qhov kub siab, tsis muaj qhov chaw yaj ruaj khov, mos tom qab cua sov, thiab tom qab ntawd yaj, nrog qhov ceev ntawm 1.25-1.35 g / cm3. Raws li nws qhov chaw mos, nws muab faib ua qhov kub qis, kub nruab nrab thiab kub siab asphalt. Qhov nruab nrab kub asphalt tso zis yog 54-56% ntawm cov thee tar. Cov khoom sib xyaw ntawm cov thee tar yog qhov nyuaj heev, uas cuam tshuam nrog cov khoom ntawm cov thee tar thiab cov ntsiab lus ntawm heteroatoms, thiab kuj cuam tshuam los ntawm cov txheej txheem coking thiab cov xwm txheej ua cov thee tar. Muaj ntau yam cim rau kev piav qhia txog cov thee tar pitch, xws li bitumen softening point, toluene insolubles (TI), quinoline insolubles (QI), coking values, thiab thee pitch rheology.

Cov thee tar yog siv ua tus binder thiab impregnant hauv kev lag luam carbon, thiab nws cov kev ua tau zoo muaj kev cuam tshuam loj heev rau cov txheej txheem tsim khoom thiab cov khoom zoo ntawm cov khoom carbon. Cov binder asphalt feem ntau siv cov asphalt hloov kho qhov kub nruab nrab lossis qhov kub nruab nrab uas muaj qhov taw tes mos nruab nrab, tus nqi coking siab, thiab β resin siab. Tus neeg sawv cev impregnating yog cov asphalt kub nruab nrab uas muaj qhov taw tes mos qis, QI qis, thiab cov khoom rheological zoo.