Kaolin yog cov ntxhia uas tsis yog xim hlau, uas yog ib hom av nplaum thiab av nplaum pob zeb feem ntau tsim los ntawm pawg kaolinite cov av nplaum.Vim nws cov tsos dawb thiab muag heev, nws tseem hu ua Baiyun av.Lub npe tom qab Gaoling Village hauv Jingdezhen, Jiangxi Province.

Nws cov kaolin ntshiab yog dawb, muag heev, thiab mos hauv kev ntxhib los mos, nrog lub cev zoo thiab tshuaj lom neeg xws li plasticity thiab hluav taws kub.Nws cov ntxhia muaj pes tsawg leeg yog tsim los ntawm kaolinite, halloysite, hydromica, illite, montmorillonite, nrog rau cov zaub mov xws li quartz thiab feldspar.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.Nyob rau hauv me me, nws yog siv nyob rau hauv yas, xim, pigments, sib tsoo log, mem hluav, tshuaj pleev ib ce txhua hnub, xab npum, tshuaj tua kab, tshuaj, textiles, roj av, tshuaj, tsev cov ntaub ntawv, tiv thaiv lub teb chaws thiab lwm yam sectors ntawm industrial sectors.

Cov yam ntxwv txheej txheem
Folding Whiteness Brightness

Dawb yog ib qho ntawm cov tsis tseem ceeb rau kev ua haujlwm thev naus laus zis ntawm kaolin, thiab high-purity kaolin yog dawb.Lub whiteness ntawm kaolin muab faib ua tej yam ntuj tso whiteness thiab calcined whiteness.Rau cov khoom siv ceramic, qhov whiteness tom qab calcination yog qhov tseem ceeb dua, thiab qhov siab dua qhov calcined whiteness, qhov zoo dua.Cov txheej txheem ceramic tau teev tseg tias kev ziab ntawm 105 ℃ yog cov txheej txheem muab qhab nia rau kev ua kom dawb huv, thiab calcining ntawm 1300 ℃ yog cov qauv ntsuas rau calcined whiteness.Lub whiteness tuaj yeem ntsuas tau los ntawm kev ntsuas whiteness.Lub whiteness meter ntsuas qhov ci ntawm 3800-7000Å Ib qho cuab yeej rau ntsuas qhov kev cuam tshuam ntawm lub teeb ntawm lub wavelength ntawm (ie, 1 angstrom = 0.1 nanometers).Nyob rau hauv ib tug whiteness meter, qhov kev xav ntawm cov qauv kuaj yog muab piv nrog cov qauv qauv (xws li BaSO4, MgO, thiab lwm yam), uas ua rau ib tug whiteness tus nqi (xws li whiteness ntawm 90, uas yog sib npaug rau 90% ntawm cov whiteness meter). qhov kev xav ntawm tus qauv qauv).

Brightness yog txheej txheem khoom zoo ib yam li whiteness, sib npaug rau 4570Å Lub whiteness nyob rau hauv (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 muaj Fe2O3, nws zoo nkaus li sawv liab thiab xim av daj;Muaj Fe2+, nws pom lub teeb xiav thiab lub teeb ntsuab;Muaj MnO2, nws pom lub teeb xim av xim;Yog hais tias nws muaj cov organic teeb meem, nws tshwm nyob rau hauv lub teeb daj, grey, xiav, dub thiab lwm yam xim.Cov impurities no muaj nyob, txo cov natural whiteness ntawm kaolin.Ntawm lawv, hlau thiab titanium cov zaub mov tseem tuaj yeem cuam tshuam cov calcined whiteness, ua rau xim pob lossis yaj nti ntawm cov plooj (porcelain).

Folding particle loj faib
Particle loj tis yog hais txog kev faib ua feem ntawm cov khoom nyob rau hauv ntuj kaolin nyob rau hauv ib tug tas mus li ntau yam ntawm txawv particle loj (hais nyob rau hauv millimeters los yog micrometer mesh), qhia nyob rau hauv feem pua.Lub particle loj faib cov yam ntxwv ntawm kaolin yog qhov tseem ceeb heev rau kev xaiv thiab kev siv cov ore.Nws qhov loj me me muaj qhov cuam tshuam loj rau nws cov yas, av nkos viscosity, ion pauv peev xwm, tsim kev ua tau zoo, kev ua kom qhuav, thiab kev ua haujlwm tua hluav taws.Kaolin ore xav tau kev ua haujlwm, thiab seb nws puas yooj yim rau kev ua kom zoo zoo tau dhau los ua ib qho ntawm cov qauv rau kev ntsuas ore zoo.Txhua lub tuam tsev ua haujlwm muaj cov cai tshwj xeeb rau qhov loj me thiab qhov zoo ntawm kaolin rau ntau lub hom phiaj.Yog tias Tebchaws Meskas xav kom cov kaolin siv los ua cov txheej txheej kom tsawg dua 2 μ Cov ntsiab lus ntawm m suav txog 90-95%, thiab cov ntawv sau cov ntaub ntawv tsawg dua 2 μ M nyiaj rau 78-80%.

Quav khi
Adhesion yog hais txog lub peev xwm ntawm kaolin los ua ke nrog cov ntaub ntawv tsis yog yas los tsim cov av nkos thiab muaj qee qhov kev ziab kom qhuav.Kev txiav txim siab ntawm kev sib khi muaj peev xwm suav nrog kev ntxiv cov qauv quartz xuab zeb (nrog rau qhov loj ntawm 0.25-0.15 particle loj feem accounting rau 70% thiab 0.15-0.09mm particle loj feem accounting rau 30%) rau kaolin.Kev txiav txim siab nws qhov siab raws li nws cov ntsiab lus xuab zeb siab tshaj plaws thaum tseem muaj peev xwm tswj tau cov av nplaum yas thiab nws lub zog flexural tom qab ziab, cov xuab zeb ntau ntxiv, qhov muaj zog ntawm kev sib khi ntawm cov kaolin no.Feem ntau, kaolin uas muaj zog plasticity kuj muaj zog binding muaj peev xwm.

Folding nplaum
Viscosity yog hais txog tus yam ntxwv ntawm cov kua dej uas cuam tshuam nws cov txheeb ze ntws vim muaj kev sib txhuam sab hauv.Nws qhov loj me (ua haujlwm ntawm 1 thaj tsam ntawm kev sib txhuam sab hauv) yog sawv cev los ntawm viscosity, hauv units ntawm Pa·s.Kev txiav txim siab ntawm viscosity feem ntau yog ntsuas los ntawm kev sib hloov viscometer, uas ntsuas qhov kev sib hloov ceev hauv kaolin av nkos uas muaj 70% cov ntsiab lus.Hauv kev tsim khoom, viscosity yog qhov tseem ceeb heev.Nws tsis yog tsuas yog ib qho tseem ceeb ntawm kev lag luam ceramic, tab sis kuj muaj kev cuam tshuam loj rau kev lag luam papermaking.Raws li cov ntaub ntawv, thaum siv kaolin ua txheej txheej nyob rau hauv txawv teb chaws, viscosity yuav tsum yog li ntawm 0.5Pa·s rau cov txheej txheem qis thiab tsawg dua 1.5Pa·s rau cov txheej txheem kub ceev.

Thixotropy yog hais txog cov yam ntxwv uas cov slurry uas tau thickened mus rau hauv gel thiab tsis ntws los ua kua tom qab raug kev nyuaj siab, thiab ces maj mam thickens mus rau hauv thawj lub xeev tom qab zoo li qub.Lub thickness coefficient yog siv los sawv cev rau nws qhov loj me, thiab nws yog ntsuas los ntawm kev siv lub viscometer outflow thiab capillary viscometer.

Cov viscosity thiab thixotropy muaj feem xyuam rau cov ntxhia muaj pes tsawg leeg, particle loj, thiab hom cation hauv av nkos.Feem ntau, cov uas muaj cov ntsiab lus siab ntawm montmorillonite, cov khoom zoo, thiab sodium raws li lub ntsiab sib pauv cation muaj siab viscosity thiab thickening coefficient.Yog li ntawd, nyob rau hauv tus txheej txheem, txoj kev xws li ntxiv cov yas av nplaum thiab txhim kho fineness feem ntau yog siv los txhim kho nws cov viscosity thiab thixotropy, thaum txoj kev xws li nce diluted electrolyte thiab dej cov ntsiab lus yog siv los txo nws.