Kaolin, wani ma'adinai wanda ba na ƙarfe ba ne, wani nau'in dutse ne na yumbu da yumbu wanda galibi ya ƙunshi ma'adanai na yumbu na ƙungiyar kaolinite. Saboda launinsa mai haske da laushi, ana kuma kiransa da ƙasan Baiyun. Babban abubuwan da ke cikinsa sune aluminum trioxide da silicon dioxide.

Tsarkakken kaolin ɗinsa fari ne, mai laushi, kuma mai laushi, yana da kyawawan halaye na zahiri da na sinadarai kamar su ƙarfin lantarki da juriya ga wuta. Mafi yawan abubuwan da ke cikin ma'adinansa sun ƙunshi kaolinite, halloysite, hydromica, illite, montmorillonite, da kuma ma'adanai kamar quartz da feldspar.

Halayen tsari:

1. Hasken Fari – Fari yana ɗaya daga cikin manyan sigogi don aikin sarrafa kaolin, kuma kaolin mai tsarki fari ne. Farin kaolin an raba shi zuwa fari na halitta da fari na calcined. Ga kayan yumbu, farin bayan calcined ya fi mahimmanci, kuma girman farin calcined, ingancinsa ya fi kyau.

2. Rarraba Girman Barbashi – Rarraba Girman Barbashi yana nufin rabon (wanda aka bayyana a cikin kashi na abun ciki) na barbashi a cikin kaolin na halitta a cikin wani tsari na ci gaba da girma daban-daban na barbashi (wanda aka bayyana a cikin milimita ko ragar micrometer). Kowace sashen masana'antu tana da takamaiman buƙatu don girman barbashi da ƙanƙantar kaolin don dalilai daban-daban. Amurka tana buƙatar kaolin da ake amfani da shi azaman shafi don samun abun ciki ƙasa da 2 μm (raga 6250), wanda ya kai 90-95%, da kuma cika takarda tare da abun ciki ƙasa da 2 μm wanda ya kai 78-80%. Don hanyoyin jefawa waɗanda ke buƙatar jefawa da sauri, saurin grouting mai sauri, da saurin bushewa, yana da mahimmanci a ƙara girman barbashi na sinadaran.

3. Dakatarwa: Dakatarwa da warwatsewa suna nufin halayen kaolin waɗanda ke da wahalar narkewa idan aka watsa su cikin ruwa. Wanda kuma aka sani da hana flocculation. Ƙaramin girman barbashi, shine mafi kyawun dakatarwa. Kaolin da ake amfani da shi a masana'antar enamel yana buƙatar kyawawan kaddarorin dakatarwa. Aikin dakatarwar samfurin da aka watsa a cikin ruwa gabaɗaya yana ƙayyade ta hanyar saurin daidaitawarsa na wani lokaci.

4. Rufin Wutar Lantarki: Kaolin mai inganci yana da kyawawan kaddarorin rufin lantarki, wanda za'a iya amfani da shi don yin yumbu mai yawan mita da yumbu mara waya. Ana iya auna matakin aikin rufin lantarki ta hanyar iyawarsa ta jure lalacewar wutar lantarki.

Rarrabawa:

Kaolin da aka wanke da ruwa, calcined kaolin metakaolin

Amfani:

Kaolin yana da amfani iri-iri, galibi ana amfani da shi wajen yin takarda, yumbu, da kayan da ba sa iya jurewa, sai kuma shafa mai, cika roba, gilashin enamel, da kayan siminti na farin siminti. A ƙanƙanin adadi, ana amfani da shi a fannoni kamar su robobi, fenti, fenti, ƙafafun niƙa, fensir, kayan kwalliya na yau da kullun, sabulu, yadi, man fetur, sinadarai, kayan gini, da sauransu.