Inkqubo yokuvelisa i-graphite electrode

Izinto ezikrwada kunye nenkqubo yokuvelisa i-graphite electrode

I-electrode yegrafiti sisixhobo esiqhuba igrafiti esinganyangekiyo kubushushu obuphezulu esiveliswa yi-petroleum knead, i-needle coke njenge-aggregate kunye ne-coal bitumen njenge-binder, eziveliswa ngothotho lweenkqubo ezinje ngokuxova, ukubumba, ukurosta, ukumilisa, i-graphitization kunye nokucutshungulwa koomatshini.

I-graphite electrode sisixhobo esibalulekileyo sokuqhuba ubushushu obuphezulu sokwenza intsimbi yombane. I-graphite electrode isetyenziselwa ukufaka amandla ombane kwisithando sombane, kwaye ubushushu obuphezulu obuveliswa yi-arc phakathi kwesiphelo se-electrode kunye netshaja busetyenziswa njengomthombo wobushushu ukunyibilikisa itshaja yokwenza intsimbi. Ezinye izithando ze-ore ezinyibilikisa izinto ezifana ne-phosphorus etyheli, i-silicon yemizi-mveliso, kunye ne-abrasives nazo zisebenzisa ii-graphite electrodes njengezinto zokuqhuba. Iimpawu zomzimba nezekhemikhali ezibalaseleyo nezikhethekileyo zee-graphite electrodes nazo zisetyenziswa kakhulu kwamanye amacandelo emizi-mveliso.

Izinto ezisetyenziswa ekuveliseni ii-electrode ze-graphite yi-petroleum coke, i-needle coke kunye ne-coal tar pitch.

I-petroleum coke yimveliso eqinileyo enokutsha efunyanwa ngokucola amalahle asele kunye ne-petroleum pitch. Umbala umnyama kwaye unemingxuma, into ephambili yi-carbon, kwaye umxholo womlotha uphantsi kakhulu, ngokubanzi ungaphantsi kwe-0.5%. I-petroleum coke ikwiklasi ye-carbon efumaneka lula kwi-graphitized. I-petroleum coke inoluhlu olubanzi lokusetyenziswa kumashishini eekhemikhali kunye ne-metallurgical. Yeyona nto iphambili yokwenza iimveliso ze-graphite zokwenziwa kunye neemveliso ze-carbon ze-aluminium ye-electrolytic.

I-petroleum coke inokwahlulwa ibe ziintlobo ezimbini: i-coke eluhlaza kunye ne-coke e-calcined ngokweqondo lobushushu bonyango lobushushu. I-coke yangaphambili ye-petroleum efunyenwe ngokucola okucothayo ine-volatiles eninzi, kwaye amandla oomatshini aphantsi. I-coke e-calcined ifunyanwa ngokucola i-coke eluhlaza. Uninzi lweendawo zokucola eTshayina zivelisa i-coke kuphela, kwaye imisebenzi yokucola yenziwa kakhulu kwizityalo zekhabhoni.

I-petroleum coke ingahlulwa ibe yi-high sulfur coke (equlethe i-sulfur engaphezulu kwe-1.5%), i-medium sulfur coke (equlethe i-0.5%-1.5% sulfur), kunye ne-low sulfur coke (equlethe i-0.5% sulfur). Imveliso yee-electrodes ze-graphite kunye nezinye iimveliso ze-graphite zokwenziwa ngokubanzi iveliswa kusetyenziswa i-low sulfur coke.

I-Needle coke luhlobo lwe-coke esemgangathweni ophezulu ene-fibrous texture ecacileyo, i-thermal expansion coefficient ephantsi kakhulu kunye ne-graphitization elula. Xa i-coke yaphukile, inokwahlulwa ibe yimicu emincinci ngokwe-texture (umlinganiselo we-aspect ngokubanzi ungaphezulu kwe-1.75). Isakhiwo se-anisotropic fibrous sinokubonwa phantsi kwe-polarizing microscope, kwaye ke ngoko sibizwa ngokuba yi-needle coke.

I-anisotropy yeempawu ze-physico-mechanical ze-needle coke icacile kakhulu. Inombane kunye nokuqhuba kakuhle kobushushu okufana nolwalathiso olude lwe-particle, kwaye i-coefficient yokwandiswa kobushushu iphantsi. Xa kusenziwa i-extrusion molding, i-long axis yee-particles ezininzi icwangciswe kwicala le-extrusion. Ke ngoko, i-needle coke yeyona nto ibalulekileyo yokwenza ii-electrodes ze-graphite ezinamandla aphezulu okanye aphezulu kakhulu. I-graphite electrode eveliswayo ine-resistivity ephantsi, i-coefficient encinci yokwandiswa kobushushu kunye nokumelana okuhle kobushushu.

I-Needle coke yahlulwe yaba yi-needle coke esekwe kwioyile eveliswa kwi-petroleum residue kunye ne-needle coke esekwe kumalahle eveliswa kwi-coal pitch raw materials ecociweyo.

I-Coal tar yenye yezona mveliso ziphambili zokucubungula i-coal tar deep. Ngumxube wee-hydrocarbons ezahlukeneyo, ezimnyama kubushushu obuphezulu, eziqinileyo okanye eziqinileyo kubushushu obuphezulu, ezingenalo iqondo lokunyibilika elizinzileyo, zithambe emva kokufudumeza, zize zinyibilike, zibe nobunzima obuyi-1.25-1.35 g/cm3. Ngokwenqanaba layo lokuthamba, yahlulwe yaba yi-asphalt yobushushu obuphantsi, ubushushu obuphakathi kunye ne-asphalt yobushushu obuphezulu. Isivuno se-asphalt yobushushu obuphakathi yi-54-56% ye-coal tar. Ukwakheka kwe-coal tar kuyinkimbinkimbi kakhulu, okunxulumene neempawu ze-coal tar kunye nomxholo we-heteroatom, kwaye kuchaphazeleka nenkqubo yenkqubo ye-coking kunye neemeko zokucubungula i-coal tar. Kukho izalathisi ezininzi zokuchonga i-coal tar pitch, njenge-bitumen softening point, i-toluene insolubles (TI), i-quinoline insolubles (QI), amaxabiso e-coking, kunye ne-coal pitch rheology.

I-Coal tar isetyenziswa njengesihlanganisi kunye nesifaka umbane kwishishini lekhabhoni, kwaye ukusebenza kwayo kunempembelelo enkulu kwinkqubo yemveliso kunye nomgangatho wemveliso yeemveliso zekhabhoni. I-binder asphalt ngokubanzi isebenzisa i-asphalt eguquliweyo yobushushu obuphakathi okanye obuphakathi enendawo yokuthamba ephakathi, ixabiso eliphezulu lokucola, kunye ne-β resin ephezulu. I-agent yokufumba yi-asphalt yobushushu obuphakathi enendawo yokuthamba ephantsi, i-QI ephantsi, kunye neempawu ezilungileyo ze-rheological.