Kaolin ndi mchere wosakhala wachitsulo, mtundu wa dongo ndi mwala wadongo womwe umakhala ndi mchere wa dongo wa kaolinite. Chifukwa ndi woyera komanso wosakhwima, umatchedwanso nthaka yoyera yamtambo. Dzina lake limatengera Gaoling Village, Jingde Town, Jiangxi Province.

Kaolin yake yoyera ndi yoyera, yofewa komanso yofewa ngati dongo, ndipo ili ndi mphamvu zabwino zakuthupi ndi zamakemikolo monga pulasitiki ndi kukana moto. Kapangidwe kake ka mchere kamakhala ndi kaolinite, halloysite, hydromica, illite, montmorillonite, quartz, feldspar ndi mchere wina. Kaolin imagwiritsidwa ntchito kwambiri, makamaka popanga mapepala, zinthu zadothi ndi zinthu zotsutsa, kutsatiridwa ndi zokutira, zodzaza rabara, ma glaze a enamel ndi zinthu zopangira simenti yoyera, komanso pang'ono zomwe zimagwiritsidwa ntchito mu mapulasitiki, utoto, utoto, mawilo opukutira, mapensulo, zodzoladzola za tsiku ndi tsiku, sopo, mankhwala ophera tizilombo, mankhwala, nsalu, mafuta, mankhwala, zipangizo zomangira, chitetezo cha dziko ndi mafakitale ena.
Kuwala Koyera Kopindidwa
Kuyera ndi chimodzi mwa zinthu zazikulu zomwe zimapangitsa kuti kaolin igwire bwino ntchito, ndipo kaolin yokhala ndi chiyero chapamwamba ndi yoyera. Kuyera kwa kaolin kumagawidwa m'magulu awiri: kuyera kwachilengedwe ndi kuyera pambuyo pa calcination. Pazinthu zopangira zadothi, kuyera pambuyo pa calcination ndikofunikira kwambiri, ndipo kuyera kwa calcination kukakwera, kumakhala bwino kwambiri. Ukadaulo wa dothi umanena kuti kuumitsa pa 105°C ndiye muyezo wowunikira kuyera kwachilengedwe, ndipo calcining pa 1300°C ndiye muyezo wowunikira kuyera kwa calcining. Kuyera kumatha kuyezedwa ndi mita yoyera. Mita yoyera ndi chipangizo chomwe chimayesa kuwunikira kwa kuwala ndi kutalika kwa 3800-7000Å (monga Angstrom, 1 Angstrom = 0.1 nm). Mu mita yoyera, yerekezerani kuwunikira kwa chitsanzo chomwe chiyenera kuyesedwa ndi chitsanzo chokhazikika (monga BaSO4, MgO, ndi zina zotero), ndiko kuti, kuyera (monga, kuyera 90 kumatanthauza 90% ya kuwunikira kwa chitsanzo chokhazikika).

Kuwala ndi njira yofanana ndi kuyera, komwe kuli kofanana ndi kuyera pansi pa kuwala kwa mafunde a 4570Å (Angstrom).

Mtundu wa kaolin umagwirizana kwambiri ndi ma oxide achitsulo kapena zinthu zachilengedwe zomwe zili mkati mwake. Kawirikawiri, uli ndi Fe2O3, yomwe ndi yofiira ndi yachikasu cha bulauni; uli ndi Fe2+, yomwe ndi yabuluu wotumbululuka ndi wobiriwira wotumbululuka; uli ndi MnO2, yomwe ndi yabulauni wotumbululuka; uli ndi zinthu zachilengedwe, yomwe ndi yachikasu chotumbululuka, imvi, buluu, ndi wakuda. Kupezeka kwa zonyansazi kumachepetsa kuyera kwachilengedwe kwa kaolin, ndipo mchere wachitsulo ndi titaniyamu umakhudzanso kuyera kwa calcium, zomwe zimayambitsa madontho kapena zipsera mu porcelain.