SEHLOPHA SA MER: Kenyelletso e Khutšoanyane ea Molao-motheo oa Pelletization
Ho limela tsa sejoale-joale tse kopaneng tsa tšepe, pellet ore e sebetsa e le konokono{0}moroalo oa boleng bo holimo bakeng sa ho etsa tšepe ea blast furnace ironmaking. Ts'ebetso ea pelletization e etsa phofshoana e ntle ea tšepe hore e be phofshoana e phahameng-e matla,{3}e phahameng{3}}e phahameng, e rarolla bothata ba hore phofshoana e ntle e ke keng ea tshelwa ka seboping ka kotloloho. Molao-motheo oa eona oa ts'ebetso o arotsoe ka mekhahlelo e mene ea mantlha: bolo, ho omisa le ho futhumatsa pele, -ho halika mocheso o phahameng, le ho pholisa lihlahisoa tse felileng, ho theha phetoho e felletseng ea 'mele le lik'hemik'hale.
I. Balling Stage: Ho thehoa ha Libolo tse Tala
The balling stage marks the beginning of the pelletization process. The core involves mixing fine iron concentrate powder (with particle size < 0.074mm accounting for >80%), li-binders (tse kang bentonite) le metsi ka har'a disc kapa drum pelletizer, moo ho thehoa libolo tse spherical tse tala ka mochine oa mochine le matla a capillary. 'Meleng, tlas'a ketso ea matla a ho potoloha le a centrifugal, likaroloana tsa concentrate li khomarela le ho hōla lera ka lera le setsi se setle e le setsi, ho etsa libolo tse tala tse nang le bophara ba 8-16mm. Ka lik'hemik'hale, li-binders le metsi li etsa marokho a metsi pakeng tsa likaroloana, ho matlafatsa matla a pele a libolo tse tala ho finyella litlhoko tsa lipalangoang tse latelang le phekolo ea mocheso.
II. Ho omisa le ho futhumatsa Mothati: Ho felloa ke metsi 'meleng le ho kopanya
Libolo tse tala li kena ka grate, moo metsi a sa lefelloeng a tlosoang karolong ea ho omisa ka tekanyo ea 200-400 ho thibela ho phatloha ha mocheso o phahameng, ebe ho kopanngoa ha pele ho phethoa karolong ea preheating ka 900-1000 degree. Nakong ena, magnetite (Fe₃O₄) ka libolo tse tala e oxidized ho hematite (Fe₂O₃), 'me sekontiri se etsa liketso tsa sintering ho theha maqhama a pele a kristale, haholo ho ntlafatsa matla a libolo tse tala le ho rala motheo oa ho halika ka mor'a moo.
III. {{1}Mohato o Phahameng oa ho Besa Mocheso: Kaho e Ncha ea Crystal le Matlafatso ea Matla
Libolo tse tala tse futhumetseng li kena ka sebōping sa rotary kapa grate kiln bakeng sa ho chesa ka 1200-1300℃, e leng senotlolo sa ho etsa thepa ea pellet ore. Likaroloana tsa Hematite lia nchafatsoa hape li hola, li etsa sebopeho se teteaneng sa kristale; litšila tse kang SiO₂ le CaO ka concentrate e etsa karolo e nyane ea mokelikeli, e tlatsang likheo tsa likaroloana ebe e etsa skeleton e thata e kopantsoeng ka mor'a ho pholile, ho netefatsa matla a batang le botsitso ba mocheso oa pellet ore. Ho sa le joalo, e etsa bonnete ba hore oxidation e feletseng ea li-oxide tsa tšepe, ho ntlafatsa boemo le ho fokotseha ha ore ea pellet.
IV. Mothati oa ho Pholisa: Ts'ebetso ea Ts'ebetso
Mocheso o phahameng-oa pellet ore e halikiloeng (e ka bang likhato tse 1000–1100 ) o kena ka annular cooler, moo moea o batang o fefoloang ho o pholisa ho likhato tse 100–150 . Ho pholisa ka potlako ho thibela ho hohla ha kristale, ho boloka sebopeho se teteaneng le matla a pellet ore le ho qoba tšenyo ea lisebelisoa tse latelang. Khase e phahameng-ea mocheso oa likhato tse 300–400 e hlahisoang nakong ea pholileng e ka sebelisoa hape ho ea ho grate bakeng sa ho omisoa le ho futhumatsa libolo tse tala, ho lemoha ho potoloha ha matla le ho fokotsa tšebeliso ea matla.
Ka ho laola hantle mocheso, sepakapaka le nako ea mohato o mong le o mong, mokhoa oa pelletization o fetola{0}}boemo ba tšepe ea boleng bo tlase hore e be phofshoana{1}ea boleng bo phahameng ba pellet. Ka boholo ba likaroloana tse lekanang le ho fokotseha ho hotle, e ka ntlafatsa bokhoni ba ho qhibilihisa sebōpi le boleng ba tšepe e qhibilihisitsoeng, e leng se etsang hore e be sehokelo sa bohlokoa indastering ea sejoale-joale ea tšepe le tšepe.
