Kaolin wani ma'adinai ne wanda ba na ƙarfe ba, nau'in yumbu da dutsen yumbu wanda ma'adinan yumbu ke mamaye.Domin fari ne mai laushi, kuma ana kiransa farin ƙasan girgije.An ba shi sunan kauyen Gaoling, garin Jingde, lardin Jiangxi.

Tsaftataccen kaolin sa fari ne, mai laushi da laushi kamar yumbu, kuma yana da kyawawan halaye na zahiri da sinadarai kamar robobi da juriya na wuta.Abubuwan da ke cikin ma'adinai sun ƙunshi kaolinite, halloysite, hydromica, illite, montmorillonite, quartz, feldspar da sauran ma'adanai.Kaolin yana da fa'idar amfani da yawa, galibi ana amfani da shi wajen yin takarda, tukwane da kayan refractory, sa'an nan kuma ana amfani da suttura, filaye na roba, glazes na enamel da albarkatun siminti, da ƙaramin adadin da ake amfani da su a cikin robobi, fenti, pigments, ƙafafun niƙa, fensir. kayan shafawa na yau da kullun, sabulu, magungunan kashe qwari, magani, yadi, man fetur, sinadarai, kayan gini, tsaron ƙasa da sauran sassan masana'antu.
Nunke Farin Haske
Farin fata yana ɗaya daga cikin mahimman sigogin aikin fasahar kaolin, kuma kaolin mai tsafta fari ne.Farin kaolin ya kasu kashi fari na halitta da fari bayan calcination.Don albarkatun yumbura, farin bayan calcination ya fi mahimmanci, kuma mafi girma da launin fata na calcination, mafi kyawun inganci.Fasahar yumbura ta tanadi cewa bushewa a 105°C shine ma'aunin ma'aunin fari na halitta, kuma ƙididdigewa a 1300°C shine ma'auni na ƙididdige fari.Ana iya auna fari da mitar fari.Mitar fari shine na'urar da ke auna hasken haske tare da tsawon zangon 3800-7000Å (watau Angstrom, 1 Angstrom = 0.1 nm).A cikin mitar fari, kwatanta tunanin samfurin da za a gwada tare da daidaitaccen samfurin (kamar BaSO4, MgO, da dai sauransu), wato, ƙimar farar fata (misali, farin 90 yana nufin 90% na hangen nesa. misali misali).

Haske shine kayan aiki mai kama da fari, wanda yayi daidai da fari a ƙarƙashin 4570Å (Angstrom) hasken haske mai tsayi.

Launin kaolin yana da alaƙa da ƙarfe oxides ko kwayoyin halitta da ke cikinsa.Gabaɗaya, yana ƙunshe da Fe2O3, wanda yake fure ja da launin ruwan rawaya;ya ƙunshi Fe2+, wanda shi ne koɗaɗɗen shuɗi da koɗaɗɗen kore;ya ƙunshi MnO2, wanda yake launin ruwan kasa;ya ƙunshi kwayoyin halitta, wanda kodadde rawaya, launin toka, shuɗi, da baki.Kasancewar waɗannan ƙazanta yana rage farar kaolin, kuma baƙin ƙarfe da ma'adinan titanium suma suna shafar fararen fata, suna haifar da tabo ko tabo a cikin farantin.