Monga mtundu wa phulusa la mapiri, metakaolin ndi njira yabwino kwambiri yosinthira simenti chifukwa chakuti imagwiritsa ntchito mphamvu zochepa komanso kuipitsa pang'ono chilengedwe panthawi ya calcination, komanso kuthekera kwake kukonza zinthu zina za simenti ya Portland, monga mphamvu ndi kulimba, ikapangidwa kukhala simenti yosakanikirana. M'zaka zaposachedwa, akatswiri ambiri akhala akudzipereka kuphunzira za ntchito ya phulusa la mapiri la kaolin. Nkhaniyi ikufotokoza kutentha kwabwino kwa calcination ndi nthawi ya kaolin, zinthu zomwe zimakhudza ntchito yake, ndi njira zodziwira makhalidwe ndi ntchito ya kaolin. Kafukufuku wakale wasonyeza kuti kutentha kwabwino kwa calcination ndi nthawi ya kaolin zimakhudzidwa ndi zinthu monga kapangidwe ka mchere, crystallinity, ndi kuchuluka kwa kaolin, zomwe zimapangitsa kuti kapangidwe ka kaolin kakhale ndi mphamvu kwambiri pa ntchito yake pambuyo pa calcination. XRD, TG-DTA, IR ndi njira zina zidagwiritsidwa ntchito pofufuza makhalidwe a miyala yaiwisi. Ntchito ya kaolin idadziwika kudzera munjira monga mayeso a Frantini, mayeso oyendetsera mpweya, ndi index ya ntchito yamphamvu. Njira zolondola kwambiri zinali mayeso a Frantini ndi index ya ntchito yamphamvu.
Metakaolin (yofupikitsidwa ngati MK) ndi silicate ya aluminiyamu yosaphwanyika (Al2O3 • 2SiO2, AS2) yopangidwa ndi kutaya madzi kwa kaolin (Al2O3 • 2SiO2 • 2 H2O, AS2H2) pa kutentha koyenera (600-900 ℃). Kaolin ndi ya kapangidwe ka silicate kokhala ndi zigawo, ndipo zigawozo zimagwirizanitsidwa ndi ma van der Waals bonds, ndi ma OH - ions omangika mwamphamvu mkati mwake. Kaolin ikatenthedwa mumlengalenga, imadutsa kusintha kambiri kwa kapangidwe kake. Ikatenthedwa kufika pafupifupi 600 ℃, kapangidwe ka kaolin kokhala ndi zigawozo kamawonongeka chifukwa cha kutaya madzi, ndikupanga gawo losinthira lokhala ndi crystallinity yoipa - metakaolin.
Chifukwa cha kapangidwe ka molekyulu kosakhazikika ka metakaolin, imakhala ndi mphamvu yokhazikika ya thermodynamic ndipo imawonetsa mphamvu zolimbitsa thupi pansi pa kusonkhezera koyenera. Metakaolin ndi phulusa lopangidwa ndi volcano lomwe limagwira ntchito kwambiri lomwe limatha kuchita ndi Ca (OH) 2 (CH) ndi madzi kuti lipange zinthu zolimbitsa thupi zofanana ndi simenti. Pogwiritsa ntchito izi, ikagwiritsidwa ntchito ngati chosakaniza cha simenti, imatha kuchita ndi CH yopangidwa panthawi ya kukhetsa simenti, zomwe zingathandize kukonza zinthu zina za simenti.
Metakaolin (MK) ndi chinthu chomwe chimapangidwa ndi madzi m'thupi la kaolin pa kutentha kwambiri, ndipo kutentha kwa calcination kumatha kukhudza ntchito ya chinthucho.
Kutentha kukakwera pamwamba pa 950 ℃, chinthucho chimayamba kuuma ndikusintha kukhala mullite ndi cristobalite,
Idzataya mphamvu yake yothira madzi m'thupi.
Kaolin yokhala ndi calcium ndi chinthu chodzaza zinthu zopangidwa ndi polymer chomwe chimagwiritsidwa ntchito kwambiri popanga zinthu monga rabara, mapulasitiki, ndi zokutira. Chingathe kuchepetsa mtengo wa zinthuzi, makamaka kusintha mawonekedwe ndi kapangidwe kake ka zinthuzo.