Ts’ebetso ea tlhahiso ea litene tsa magnesia carbon refractory

lisebelisoa tse so ntlafatsoe

Lisebelisoa tsa mantlha tsa litene tsa MgO-C li kenyelletsa magnesia e kopantsoeng kapa sintered magnesia, flake graphite, li-organic binders le li-antioxidants.

Magnesia

Magnesia ke thepa e ka sehloohong e tala bakeng sa tlhahiso ea litene tsa MgO-C, tse ka aroloa ka magnesia a kopantsoeng le magnesia a sintered. Ha ho bapisoa le sintered magnesia, magnesia e kopantsoeng e na le melemo ea lijo-thollo tsa kristale ea periclase le boholo ba palo e kholo ea sekhahla. Ke thepa e ka sehloohong e tala e sebelisoang ha ho etsoa litene tsa carbon ea magnesia. Ho hlahisa li-refractories tse tloaelehileng tsa magnesia ho hloka matla a mocheso o phahameng le ho hanyetsa kutu bakeng sa lisebelisoa tse tala tsa magnesia. Ka hona, tlhokomelo e lefshoa ho bohloeki ba magnesia le karolelano ea C / S le litaba tsa B2O3 ka har’a lik’hemik’hale. Ka nts’etsopele ea indasteri ea metallurgic, maemo a smelting a ntse a eketseha le ho feta. Ho phaella ho lik’hemik’hale tsa lik’hemik’hale, magnesia a sebelisoang ka litene tsa MgO-C tse sebelisoang ka thepa ea metallurgical (converter, sebōpi sa motlakase, ladle, joalo-joalo) e hloka boima bo phahameng le Great crystallization.

Mohloli oa carbon

Ebang ke litene tsa setso tsa MgO-C kapa litene tsa MgO-C tsa carbon tse tlaase tse sebelisoang ka bongata, flake graphite e sebelisoa haholo-holo e le mohloli oa carbon. Graphite, joalo ka thepa e ka sehloohong e tala bakeng sa tlhahiso ea litene tsa MgO-C, e rua molemo haholo ho thepa ea eona e ntle ea ‘mele: ① e sa kolobiseng ho slag. ②Mohatsela o phahameng oa mocheso. ③Katoloso e tlase ea mocheso. Ho phaella moo, lisebelisoa tsa graphite le refractory ha li eutectic ka mocheso o phahameng, ‘me li na le refractoriness e phahameng. Ho hloeka ha graphite ho na le tšusumetso e kholo mosebetsing oa litene tsa MgO-C. Ka kakaretso, graphite e nang le carbon content e fetang 95%, ‘me e ntle haholo, e fetang 98% e lokela ho sebelisoa.

Ho phaella ho graphite, carbon black e boetse e sebelisoa ka tloaelo ho hlahisa litene tsa carbon tsa magnesia. Carbon black ke ntho e qhalakantsoeng haholo e ntšo ea phofshoana e entsoeng ke ho bola ha mocheso kapa mollo o sa fellang oa hydrocarbon hydrocarbons. Khabone e ntšo e na le likaroloana tse ntle (ka tlase ho 1μm), sebaka se seholo se ikhethileng, ‘me karolo e kholo ea khabone ke 90 ~ 99%, bohloeki bo phahameng, bohloeki bo phahameng ba phofo, botsitso bo phahameng ba mocheso, conductivity e tlase ea mocheso, ho thata ho graphitize carbon. . Ho eketsoa ha carbon black ho ka ntlafatsa ho hanyetsa ha spalling ea litene tsa MgO-C, ho eketsa palo ea carbon e setseng, le ho eketsa bongata ba litene.

Moemeli ea tlamang

Li-binders tse sebelisoang ka tloaelo bakeng sa tlhahiso ea litene tsa MgO-C li kenyelletsa sekontiri sa mashala, sekontiri sa mashala le sekontiri sa petroleum, hammoho le li-carbon resin tse khethehileng, polyols, li-phenolic resins tse fetotsoeng ka sekontiri, li-synthetic resin, joalo-joalo.

1) Lintho tsa asphalt. Tarpitch ke mofuta oa thepa ea thermoplastic. E na le litšobotsi tsa kamano e phahameng le graphite le magnesium oxide, tekanyo e phahameng ea masala a carbon ka mor’a carbonization, le theko e tlaase. E ‘nile ea sebelisoa ka bongata nakong e fetileng; empa sekontiri se nang le tar se na le carcinogenic aromatics hydrocarbons, haholo-holo litaba tsa benzophthalone. Holimo; ka lebaka la matlafatso ea tlhokomeliso ea tikoloho, tšebeliso ea sekontiri sa sekontiri e se e fokotseha.

2) Lintho tsa resin. Resin ea maiketsetso e etsoa ke karabelo ea phenol le formaldehyde. E ka kopanya hantle le likaroloana tsa refractory mocheso oa kamore. Ka mor’a carbonization, sekhahla sa khabone se setseng se phahame. Hona joale ke eona e tlamang ka sehloohong bakeng sa tlhahiso ea litene tsa MgO-C; empa e thehoa ka mor’a carbonization. Sebopeho sa marang-rang sa khalase ha se loketse ho hanyetsa mocheso oa mocheso le khanyetso ea oxidation ea thepa ea refractory.

3) Motheong oa asphalt le resin, ntho e fumanoang ka mor’a ho fetoloa. Haeba moemeli oa tlamahano a ka etsoa ka carbonized ho theha mohaho o kentsoeng le ho etsa thepa ea carbon fiber in situ, joale moemeli enoa oa tlamahano o tla ntlafatsa ts’ebetso e phahameng ea mocheso oa thepa ea refractory.

Li-antioxidants

E le ho ntlafatsa khanyetso ea oxidation ea litene tsa MgO-C, hangata ho kenyelletsoa li-additives tse nyenyane. Li-additives tse tloaelehileng ke Si, Al, Mg, Al-Si, Al-Mg, Al-Mg-Ca, Si-Mg-Ca, SiC, B4C, BN le li-additives tse sa tsoa tlalehoa Al-BC le Al-SiC-C [5. -7]. Molao-motheo oa ketso ea li-additives o ka aroloa ka likarolo tse peli: Ka lehlakoreng le leng, ho ea ka pono ea thermodynamics, ke hore, mocheso o sebetsang, li-additives kapa li-additives li itšoara ka carbon ho etsa lintho tse ling, ‘me kamano ea bona ea oksijene e kholoanyane. ho feta khabone le oksijene. , Ho nka pele ho feta carbon hore e be oxidized ho sireletsa carbon; ka lehlakoreng le leng, ho ea ka pono ea kinetics, lik’hemik’hale tsa Density, li-block pores, li sitisa ho ata ha oksijene le lihlahisoa tsa karabelo, joalo-joalo.