Cov txheej txheem kev paub txog graphite electrode

Cov Khoom Siv Raw: Cov khoom siv raw twg siv rau kev tsim cov pa roj carbon?

Hauv kev tsim cov pa roj carbon, cov ntaub ntawv raw feem ntau siv tuaj yeem muab faib ua cov khoom siv raw carbon khov thiab cov binder thiab impregnating agent.
Cov khoom siv carbon khov kho suav nrog roj av coke, bituminous coke, metallurgical coke, anthracite, graphite ntuj thiab graphite seem, thiab lwm yam.
Cov khoom siv khi thiab cov khoom siv impregnating suav nrog cov thee pitch, thee tar, anthracene roj thiab cov khoom siv hluavtaws, thiab lwm yam.
Tsis tas li ntawd xwb, qee cov ntaub ntawv pabcuam xws li xuab zeb quartz, cov khoom metallurgical coke thiab hmoov coke kuj siv rau hauv kev tsim khoom.
Qee cov khoom siv carbon thiab graphite tshwj xeeb (xws li carbon fiber, activated carbon, pyrolytic carbon thiab pyrolytic graphite, iav carbon) yog tsim los ntawm lwm cov ntaub ntawv tshwj xeeb.

Calcination: Calcination yog dab tsi? Cov ntaub ntawv raw twg yuav tsum tau calcined?

Kub siab ntawm cov khoom siv carbon raw cais tawm ntawm huab cua (1200-1500 ° C)
Cov txheej txheem ntawm kev kho cua sov hu ua calcination.
Kev calcination yog thawj txoj kev kho cua sov hauv kev tsim cov pa roj carbon. Kev calcination ua rau muaj ntau yam kev hloov pauv hauv cov qauv thiab cov khoom siv lub cev thiab tshuaj ntawm txhua yam khoom siv carbonaceous.
Ob qho tib si anthracite thiab petroleum coke muaj qee qhov ntawm cov khoom volatile thiab yuav tsum tau calcined.
Qhov kub ntawm cov coke ntawm bituminous coke thiab metallurgical coke yog qhov siab heev (saum toj no 1000 ° C), uas yog sib npaug rau qhov kub ntawm lub cub tawg calcining hauv cov nroj tsuag carbon. Nws tsis tuaj yeem calcinate thiab tsuas yog xav tau kom qhuav nrog dej noo.
Txawm li cas los xij, yog tias bituminous coke thiab petroleum coke siv ua ke ua ntej calcining, lawv yuav tsum raug xa mus rau calciner rau calcining ua ke nrog petroleum coke.
Cov graphite ntuj thiab cov carbon dub tsis tas yuav tsum tau calcination.
Kev Tsim Khoom: Lub hauv paus ntsiab lus ntawm kev tsim khoom extrusion yog dab tsi?
Lub ntsiab lus ntawm cov txheej txheem extrusion yog tias tom qab cov tshuaj nplaum dhau los ntawm lub nozzle ntawm ib qho duab nyob rau hauv siab, nws yog compacted thiab plastically deformed rau hauv ib qho dawb paug nrog ib qho duab thiab qhov loj me.
Cov txheej txheem extrusion molding feem ntau yog cov txheej txheem yas deformation ntawm cov tshuaj txhuam.

Cov txheej txheem extrusion ntawm cov tshuaj nplaum yog nqa tawm hauv cov khoom siv chamber (lossis lub tog raj kheej nplaum) thiab lub voj voog arc nozzle.
Cov tshuaj nplaum kub hauv chav thauj khoom yog tsav los ntawm lub plunger tseem ceeb tom qab.
Cov roj hauv cov tshuaj nplaum raug yuam kom raug ntiab tawm tas li, cov tshuaj nplaum raug nias tas li thiab cov tshuaj nplaum txav mus tom ntej tib lub sijhawm.
Thaum cov tshuaj nplaum txav mus rau hauv lub tog raj kheej ntawm lub chamber, cov tshuaj nplaum tuaj yeem suav tias yog qhov ntws ruaj khov, thiab cov txheej granular yeej sib luag.
Thaum cov tshuaj nplaum nkag mus rau hauv qhov ntawm lub extrusion nozzle nrog arc deformation, cov tshuaj nplaum ze rau ntawm phab ntsa ntawm lub qhov ncauj yuav raug kev sib txhuam ntau dua thaum ua ntej, cov khoom pib khoov, cov tshuaj nplaum sab hauv tsim cov kev sib tw sib txawv, cov tshuaj nplaum sab hauv ua ntej, ua rau cov khoom raws li qhov ceev radial tsis sib xws, yog li nyob rau hauv lub extrusion block.

Qhov kev ntxhov siab sab hauv uas tshwm sim los ntawm qhov sib txawv ntawm cov txheej sab hauv thiab sab nraud yog tsim tawm.
Thaum kawg, cov tshuaj nplaum nkag mus rau hauv qhov linear deformation thiab yog extruded.
Kev ci khoom noj
Kev ci yog dab tsi? Lub hom phiaj ntawm kev ci yog dab tsi?

Kev ci yog ib txoj kev kho cua sov uas cov khoom nyoos raug nias kom sov ntawm qee qhov nqi raws li qhov xwm txheej ntawm kev cais cua hauv qhov chaw tiv thaiv hauv lub cub tawg.

Lub hom phiaj ntawm kev txhawb nqa yog:
(1) Tsis suav cov khoom uas yaj tau yooj yim Rau cov khoom siv cov thee asphalt ua cov khoom sib txuas, kwv yees li 10% ntawm cov khoom uas yaj tau yooj yim feem ntau raug tso tawm tom qab ci. Yog li ntawd, tus nqi ntawm cov khoom ci feem ntau yog qis dua 90%.
(2) Cov khoom siv raw ntawm cov khoom siv binder coking raug ci raws li qee yam kev siv tshuab los ua cov khoom siv binder coking. Lub network coke tau tsim ntawm cov khoom sib sau ua ke kom txuas tag nrho cov khoom sib sau ua ke nrog ntau qhov sib txawv, yog li cov khoom muaj qee yam khoom siv lub cev thiab tshuaj lom neeg. Nyob rau hauv tib qho xwm txheej, qhov siab dua ntawm tus nqi coking, qhov zoo dua. Tus nqi coking ntawm qhov nruab nrab - kub asphalt yog li 50%.
(3) Daim duab geometric ruaj khov
Hauv cov txheej txheem ci ntawm cov khoom nyoos, qhov tshwm sim ntawm kev mos thiab kev tsiv teb tsaws chaw tau tshwm sim. Nrog rau qhov nce ntawm qhov kub, lub network coking tau tsim, ua rau cov khoom khov kho. Yog li ntawd, nws cov duab tsis hloov pauv thaum qhov kub nce.
(4) Txo qhov resistivity
Hauv cov txheej txheem ci, vim yog kev tshem tawm cov volatiles, coking ntawm asphalt tsim ib daim phiaj coke, qhov kev rhuav tshem thiab polymerization ntawm asphalt, thiab kev tsim ntawm lub network loj hexagonal carbon ring plane, thiab lwm yam, qhov resistivity txo qis heev. Kwv yees li 10000 x 10-6 raw khoom resistivity Ω "m, tom qab ci los ntawm 40-50 x 10-6 Ω" m, hu ua cov neeg coj zoo.
(5) Kev txo qhov ntim ntxiv
Tom qab ci, cov khoom yuav ntsws li ntawm 1% ntawm txoj kab uas hla, 2% ntawm qhov ntev thiab 2-3% ntawm qhov ntim.
Txoj kev Imprognation: Vim li cas macerate cov khoom carbon?
Cov khoom nyoos tom qab compression molding muaj porosity tsawg heev.
Txawm li cas los xij, tom qab ci cov khoom nyoos, ib feem ntawm cov thee asphalt raug rhuav tshem mus rau hauv roj thiab khiav tawm, thiab lwm qhov yog coking rau hauv bituminous coke.
Qhov ntim ntawm cov bituminous coke uas tsim tawm yog me dua li ntawm cov thee bitumen. Txawm hais tias nws me ntsis hauv cov txheej txheem ci, ntau qhov tsis sib xws thiab me me nrog ntau qhov sib txawv ntawm qhov loj me tseem tsim nyob rau hauv cov khoom.
Piv txwv li, tag nrho cov porosity ntawm cov khoom graphitized feem ntau yog txog li 25-32%, thiab cov khoom carbon feem ntau yog 16-25%.
Qhov muaj ntau lub qhov hws yuav cuam tshuam rau cov khoom siv lub cev thiab tshuaj ntawm cov khoom.
Feem ntau hais lus, cov khoom graphiteized nrog porosity nce, txo qhov ntim ceev, nce resistivity, mechanical zog, ntawm qee qhov kub ntawm qhov oxidation tus nqi yog accelerated, corrosion kuj kuj deteriorated, roj thiab kua yooj yim permeable.
Impregnation yog ib qho txheej txheem los txo qhov porosity, ua kom qhov ceev, ua kom lub zog compressive, txo qhov resistivity ntawm cov khoom tiav, thiab hloov cov khoom siv lub cev thiab tshuaj ntawm cov khoom.
Graphitization: Graphitization yog dab tsi?
Lub hom phiaj ntawm graphitization yog dab tsi?
Graphitization yog ib qho txheej txheem ntawm kev kho cua sov kub siab siv cov khoom ci kom sov rau qhov kub siab hauv qhov chaw tiv thaiv ntawm lub cub tawg graphitization kom ua rau lub hexagonal carbon atom grid hloov pauv los ntawm kev sib tshooj tsis sib xws hauv qhov chaw ob-seem mus rau kev sib tshooj hauv qhov chaw peb-seem thiab nrog cov qauv graphite.

Nws lub hom phiaj yog:
(1) Txhim kho qhov thermal thiab hluav taws xob conductivity ntawm cov khoom.
(2) Txhawm rau txhim kho qhov kub thiab txias tsis kam thiab tshuaj lom neeg ruaj khov ntawm cov khoom.
(3) Txhim kho lubricity thiab hnav tsis kam ntawm cov khoom.
(4) Tshem tawm cov khoom tsis huv thiab txhim kho lub zog ntawm cov khoom.

Kev Siv Tshuab: Vim li cas cov khoom siv carbon thiaj xav tau kev siv tshuab?
(1) Qhov xav tau kev phais yas

Cov khoom siv carbon uas raug nias nrog qee qhov loj me thiab cov duab muaj ntau qib sib txawv ntawm kev hloov pauv thiab kev puas tsuaj thaum lub sijhawm ci thiab graphitization. Tib lub sijhawm, qee cov khoom sau tau sib txuas rau ntawm qhov chaw ntawm cov khoom siv carbon uas raug nias.
Nws siv tsis tau yam tsis muaj kev ua tiav tshuab, yog li cov khoom yuav tsum tau ua kom zoo nkauj thiab ua tiav rau hauv cov duab geometric tshwj xeeb.

(2) Qhov xav tau siv

Raws li tus neeg siv xav tau rau kev ua tiav.
Yog tias lub graphite electrode ntawm lub cub hluav taws xob steelmaking yuav tsum tau txuas nrog, nws yuav tsum tau ua rau hauv qhov threaded ntawm ob qho kawg ntawm cov khoom, thiab tom qab ntawd ob lub electrodes yuav tsum tau txuas nrog siv nrog cov threaded sib koom ua ke tshwj xeeb.

(3) Cov kev cai ntawm kev siv tshuab

Qee cov khoom yuav tsum tau ua tiav rau hauv cov duab tshwj xeeb thiab cov lus qhia raws li cov kev xav tau ntawm cov neeg siv.
Txawm tias qhov roughness ntawm qhov chaw qis dua kuj tseem xav tau.

Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-10-2020