Ma ke ʻano he ʻano mea lehu pele, he pani maikaʻi loa ka metakaolin no ka sima ma muli o kona hoʻohana haʻahaʻa o ka ikehu a me ka haʻahaʻa o ka haumia o ke kaiapuni i ka wā o ke kaʻina hana calcination, a me kona hiki ke hoʻomaikaʻi i kekahi mau waiwai o ka sima Portland, e like me ka ikaika a me ke kūpaʻa, ke hana ʻia i sima hui ʻia. I nā makahiki i hala iho nei, ua hoʻolaʻa ʻia ka nui o nā haumāna i ke aʻo ʻana i ka hana lehu pele o kaolin. Hōʻike kēia ʻatikala i ka mahana calcination kūpono a me ka manawa o ka kaolin, nā mea e pili ana i kāna hana, a me nā ʻano hana no ka ʻike ʻana i nā waiwai a me ka hana o kaolin. Ua hōʻike nā haʻawina ma mua ua hoʻopili ʻia ka mahana calcination kūpono a me ka manawa no ka kaolin e nā mea e like me ka haku mele mineral, crystallinity, a me ka nui o ka kaolin, a ʻo ka crystallinity o ke ʻano kaolin ka hopena nui loa i kāna hana ma hope o ka calcination. Ua hoʻohana ʻia ʻo XRD, TG-DTA, IR a me nā ʻano hana ʻē aʻe e kālailai i nā waiwai o ka ore maka. Ua hoʻoholo ʻia ka hana o kaolin ma o nā ʻano hana e like me ka hoʻāʻo Frantini, ka hoʻāʻo conductivity, a me ka helu kuhikuhi hana ikaika. ʻO nā ʻano hana pololei loa ʻo ia ka hoʻāʻo Frantini a me ka hoʻāʻo helu kuhikuhi hana ikaika.
ʻO Metakaolin (i hoʻopōkole ʻia ʻo MK) he silicate alumini anhydrous (Al2O3 • 2SiO2, AS2) i hoʻokumu ʻia e ka dehydration o kaolin (Al2O3 • 2SiO2 • 2 H2O, AS2H2) ma kahi mahana kūpono (600-900 ℃). No Kaolin ka ʻano silicate papa, a ua hoʻopaʻa ʻia nā papa e nā pilina van der Waals, me nā ion OH - i hoʻopaʻa paʻa ʻia i loko. Ke hoʻomehana ʻia kaolin i ka lewa, ua loli kekahi mau ʻano. Ke hoʻomehana ʻia a hiki i kahi 600 ℃, ua luku ʻia ke ʻano papa o kaolin ma muli o ka dehydration, e hana ana i kahi pae hoʻololi me ka crystallinity maikaʻi ʻole - metakaolin.
Ma muli o ka hoʻonohonoho molekala ʻano ʻole o ka metakaolin, hōʻike ia i kahi kūlana metastable thermodynamic a hōʻike i nā waiwai cementitious ma lalo o ka hoʻonāukiuki kūpono. ʻO Metakaolin kahi mea lehu pele hana nui e hiki ke hana me Ca (OH) 2 (CH) a me ka wai e hana i nā huahana hydration e like me ka sima. Ma ka hoʻohana ʻana i kēia hiʻohiʻona, i ka wā e hoʻohana ʻia ai ma ke ʻano he admixture no ka sima, hiki iā ia ke hana me CH i hana ʻia i ka wā o ke kaʻina hana hydration sima, hiki ke hoʻomaikaʻi i kekahi mau waiwai o ka sima
ʻO Metakaolin (MK) kahi huahana i hoʻokumu ʻia e ka dehydration o ke kaolin ma nā mahana kiʻekiʻe, a hiki i ka mahana calcination ke hoʻopilikia i ka hana o ka huahana.
Ke piʻi ka mahana ma luna o 950 ℃, hoʻomaka ka huahana e crystallize a hoʻololi i mullite a me cristobalite,
E nalowale ana kāna hana hydration.
ʻO ke kaolin i hoʻopalulu ʻia kahi mea hoʻopihapiha inorganic i hoʻohana pinepine ʻia i ka ʻoihana hana o nā mea polymer e like me ka laholio, nā plastics, a me nā uhi. Hiki iā ia ke hōʻemi i ke kumukūʻai o kēia mau huahana, ʻoi aku ka hoʻomaikaʻi ʻana i nā waiwai kino a me nā kemika o nā mea.