MER GROUP: Chiyambi Chachidule cha Mfundo Yopangira Pelletization
M'mafakitale amakono ophatikizika azitsulo, miyala ya pellet imakhala ngati gawo lalikulu-lolemetsa kwambiri popanga chitsulo choyaka moto. Njira yopangira ma pellets imapanga ufa wosalala wa iron concentrate kukhala wokwera-wamphamvu,{3}}okwera{3}}obulungira, kuthetsa vuto loti ufa sungalowe mung'anjo. Mfundo yake yogwirira ntchito imagawidwa m'magawo anayi ofunikira: kupiringa, kuyanika ndi kutentha koyambirira, -kuwotcha kutentha kwambiri, ndi kuziziritsa kuzinthu zomalizidwa, kupanga njira yosinthira thupi ndi mankhwala.
I. Balling Stage: Kupanga Mipira Yobiriwira
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%), zomangira (monga bentonite) ndi madzi mu diski kapena drum pelletizer, kumene mipira yobiriwira yozungulira imapangidwa kupyolera mu makina othamanga ndi mphamvu za capillary. Mwathupi, mothandizidwa ndi mphamvu zozungulira komanso zapakati, tinthu tating'onoting'ono timamatira ndikukula wosanjikiza ndi wosanjikiza ndi pachimake chapakati, ndikupanga mipira yobiriwira yokhala ndi mainchesi 8-16mm. Mankhwala, zomangira ndi madzi zimapanga milatho yamadzimadzi pakati pa tinthu tating'onoting'ono, kupititsa patsogolo mphamvu yoyamba ya mipira yobiriwira kuti ikwaniritse zofunikira za kayendedwe kake ndi kutentha.
II. Kuyanika ndi Kutentha Kwambiri Gawo: Kutaya madzi m'thupi ndi kuphatikiza
Mipira yobiriwira imalowa mu kabati, kumene madzi aulere amachotsedwa mu gawo lowumitsa pa 200-400 digiri kuti ateteze kuphulika pa kutentha kwakukulu, ndiyeno kugwirizanitsa koyambirira kumatsirizidwa mu gawo la preheating pa 900-1000 digiri. Panthawi imeneyi, magnetite (Fe₃O₄) mu mipira wobiriwira ndi oxidized kuti hematite (Fe₂O₃), ndi binder amakumana sintering zochita kupanga koyamba kristalo malumikizidwe, kwambiri kuwongolera mphamvu ya mipira wobiriwira ndi kuyala maziko kwa wotsatira Kuwotcha.
III. Wapamwamba{{1}Njira Yowotchera Kutentha: Kumanganso Crystal ndi Kulimbikitsa Mphamvu
Mipira yobiriwira yomwe imatenthedwa imalowa mumoto wozungulira kapena kabati yamoto kuti iwotchere pa 1200-1300 digiri, yomwe ndi chinsinsi chopanga katundu wa pellet ore. Tinthu tating'onoting'ono ta Hematite timapanganso ndikukula, ndikupanga mawonekedwe a kristalo wandiweyani; zonyansa monga SiO₂ ndi CaO mu maganizo kupanga pang'ono madzi gawo, amene amadzaza tinthu mipata ndi kupanga zolimba consolidated mafupa pambuyo kuzirala, kuonetsetsa kuzizira mphamvu ndi matenthedwe bata wa pellet ore. Pakadali pano, zimatsimikizira kuti makutidwe ndi okosijeni wathunthu wazitsulo zachitsulo, kuwongolera kalasi ndi kuchepetsedwa kwa miyala ya pellet.
IV. Gawo Lozizira: Kukhazikika kwa Magwiridwe
Kutentha kwapamwamba-kotentha kwambiri (pafupifupi 1000–1100 degrees ) kumalowa mu chozizira cha annular, momwe mpweya wozizira umawululidwa kuti uzizire mpaka madigiri 100–150 . Kuzizira kofulumira kumalepheretsa kuphulika kwa kristalo, kusunga mawonekedwe owundana ndi mphamvu ya miyala ya pellet ndikupewa kuwonongeka kwa zida zotsatila. Mpweya wotentha kwambiri-wopanda 300–400 digirii wopangidwa pozizira ukhoza kugwiritsiridwa ntchitonso ku kabati kuti awumitse ndi kuwotcha mipira yobiriwira isanayambe, kuzindikira kuyenda kwa mphamvu ndi kuchepetsa kugwiritsa ntchito mphamvu.
Mwa kuwongolera bwino kutentha, mpweya ndi nthawi ya gawo lililonse, ma pelletization amasintha-iron concentrate yotsika kwambiri kukhala ufa wapamwamba kwambiri-. Ndi kukula yunifolomu tinthu ndi reducibility wabwino, akhoza kusintha kuphulika ng'anjo smelting dzuwa ndi chitsulo chosungunula khalidwe, kupanga ulalo kiyi mu makampani chitsulo ndi zitsulo zamakono.
