Kaolin yog cov ntxhia uas tsis yog xim hlau, ib hom av nplaum thiab cov av nplaum pob zeb uas tau tswj hwm los ntawm kaolinite av nplaum ntxhia.Vim nws yog dawb thiab muag heev, nws tseem hu ua dawb huab av.Nws yog lub npe hu ua Gaoling Village, Jingde Town, Jiangxi Province.

Nws cov kaolin ntshiab yog dawb, muag heev thiab mos av nplaum zoo li, thiab muaj lub cev zoo thiab tshuaj lom neeg xws li yas thiab hluav taws kub.Nws cov ntxhia muaj pes tsawg leeg yog tsim los ntawm kaolinite, halloysite, hydromica, illite, montmorillonite, quartz, feldspar thiab lwm yam minerals.Kaolin muaj ntau yam kev siv, feem ntau yog siv hauv papermaking, ceramics thiab refractory cov ntaub ntawv, ua raws li cov coatings, roj hmab fillers, enamel glazes thiab dawb cement raw cov ntaub ntawv, thiab ib tug me me siv nyob rau hauv plastics, xim, pigments, sib tsoo log, mem hluav, niaj hnub tshuaj pleev ib ce, xab npum, tshuaj tua kab, tshuaj, textile, roj av, tshuaj, tsev cov ntaub ntawv, tiv thaiv lub teb chaws thiab lwm yam kev lag luam sectors.
Folded Whiteness Brightness
Dawb yog ib qho tseem ceeb ntawm kaolin txoj kev ua tau zoo, thiab kaolin nrog siab purity yog dawb.Lub whiteness ntawm kaolin muab faib ua tej yam ntuj tso whiteness thiab whiteness tom qab calcination.Rau cov khoom siv ceramic, qhov whiteness tom qab calcination yog qhov tseem ceeb dua, thiab qhov siab dua qhov calcination whiteness, qhov zoo dua.Cov cuab yeej siv thev naus laus zis tau teev tseg tias kev ziab ntawm 105 ° C yog tus qauv muab qhab nia rau ntuj dawb, thiab calcining ntawm 1300 ° C yog tus qauv ntsuas rau calcining whiteness.Whiteness tuaj yeem ntsuas nrog lub ntsuas qhov dawb.Lub meter whiteness yog ib yam khoom uas ntsuas qhov reflectance ntawm lub teeb nrog lub wavelength ntawm 3800-7000Å (ie Angstrom, 1 Angstrom = 0.1 nm).Nyob rau hauv lub whiteness meter, sib piv cov reflectance ntawm tus qauv mus kuaj nrog tus qauv qauv (xws li BaSO4, MgO, thiab lwm yam), uas yog, tus nqi whiteness (piv txwv li, whiteness 90 txhais tau tias 90% ntawm cov reflectance ntawm lub whiteness). qauv qauv).

Brightness yog txheej txheem khoom zoo ib yam li whiteness, uas yog sib npaug rau whiteness nyob rau hauv 4570Å (Angstrom) wavelength lub teeb irradiation.

Cov xim ntawm kaolin feem ntau cuam tshuam nrog cov hlau oxides lossis cov organic teeb meem nws muaj.Feem ntau, nws muaj Fe2O3, uas yog sawv liab thiab brownish daj;muaj Fe2+, uas yog daj ntseg xiav thiab daj ntseg ntsuab;muaj MnO2, uas yog xim av daj;muaj cov organic teeb meem, uas yog daj ntseg daj, grey, xiav, thiab dub.Lub xub ntiag ntawm cov impurities no txo ​​cov natural whiteness ntawm kaolin, thiab hlau thiab titanium minerals kuj muaj feem xyuam rau cov calcined whiteness, ua rau stains los yog caws pliav hauv plooj (porcelain).