Njengohlobo lwezinto zomlotha wentaba-mlilo, i-metakaolin iyindawo enhle kakhulu yokufaka usimende ngenxa yokusetshenziswa kwayo kwamandla aphansi kanye nokungcola okuphansi kwemvelo ngesikhathi senqubo yokubala, kanye nekhono layo lokuthuthukisa izakhiwo ezithile zesimende sasePortland, njengokuqina nokuqina, uma senziwe isimende esixubile. Eminyakeni yamuva nje, izazi eziningi zizinikele ekutadisheni umsebenzi womlotha wentaba-mlilo we-kaolin. Lesi sihloko sichaza izinga lokushisa elifanele lokubala kanye nesikhathi se-kaolin, izici ezithinta umsebenzi wayo, kanye nezindlela zokuthola izakhiwo kanye nomsebenzi we-kaolin. Izifundo zangaphambilini zibonise ukuthi izinga lokushisa elifanele lokubala kanye nesikhathi se-kaolin kuthonywa yizici ezifana nokwakheka kwamaminerali, i-crystallinity, kanye nokuqukethwe kwe-kaolin, phakathi kwazo i-crystallinity yesakhiwo se-kaolin inomthelela omkhulu emsebenzini wayo ngemva kokubala. I-XRD, i-TG-DTA, i-IR nezinye izindlela zasetshenziswa ukuhlaziya izakhiwo ze-ore eluhlaza. Umsebenzi we-kaolin wanqunywa ngezindlela ezifana nokuhlolwa kwe-Frantini, ukuhlolwa kokuqhuba, kanye ne-index yomsebenzi wamandla. Izindlela ezinembe kakhulu kwakuyi-Frantini test kanye ne-index yomsebenzi wamandla.
I-Metakaolin (efushaniswe ngokuthi i-MK) iyi-silicate ye-aluminium engamanzi (Al2O3 • 2SiO2, AS2) eyakhiwe ngokuphelelwa amanzi kwe-kaolin (Al2O3 • 2SiO2 • 2 H2O, AS2H2) ekushiseni okufanele (600-900 ℃). I-Kaolin ingeyesakhiwo se-silicate esinezingqimba, futhi izingqimba zihlanganiswa yizibopho ze-van der Waals, ezinama-ion e-OH aboshwe ngokuqinile ngaphakathi kwayo. Lapho i-kaolin ishiswa emoyeni, idlula ezinguqukweni eziningana zesakhiwo. Uma ishiswa ibe cishe ku-600 ℃, isakhiwo esinezingqimba se-kaolin siyabhujiswa ngenxa yokuphelelwa amanzi, kwakha isigaba sokuguquka esine-crystallinity empofu - i-metakaolin.
Ngenxa yokuhlelwa okungajwayelekile kwama-molecule e-metakaolin, ikhombisa isimo sokuqina kwe-thermodynamic futhi ikhombisa izakhiwo zokubumba ngaphansi kokuvusa okufanele. I-Metakaolin iyinto yomlotha wentaba-mlilo esebenza kakhulu engasabela ne-Ca (OH) 2 (CH) namanzi ukukhiqiza imikhiqizo yokubumba efana ne-samente. Ngokusebenzisa lesi sici, uma sisetshenziswa njengengxube ye-samente, ingasabela ne-CH ekhiqizwa ngesikhathi senqubo yokubumba i-samente, engathuthukisa izakhiwo ezithile ze-samente.
I-Metakaolin (MK) umkhiqizo owakhiwa ukuphelelwa amanzi emzimbeni kwe-kaolin emazingeni okushisa aphezulu, futhi izinga lokushisa le-calcination lingathinta umsebenzi womkhiqizo.
Uma izinga lokushisa likhuphuka ngaphezu kuka-950 ℃, umkhiqizo uqala ukubumbana futhi uguquke ube yi-mullite ne-cristobalite,
Izolahlekelwa umsebenzi wayo wokuthola amanzi emzimbeni.
I-kaolin ene-calcined iyisithako esivame ukusetshenziswa embonini yokukhiqiza izinto ze-polymer ezifana nerabha, ipulasitiki, kanye nopende. Inganciphisa izindleko zale mikhiqizo, ikakhulukazi ithuthukise izakhiwo zomzimba nezamakhemikhali zezinto.