Txoj Kev Tshem Tawm Titanium Dioxide Impurities
Hauv cov txheej txheem titanium dioxide, yog tias cov impurities tsis raug tshem tawm tag nrho, thaum calcined ntawm qhov kub thiab txias, ntau yam impurity xws li hlau, manganese, vanadium, thiab lwm yam rau lub xeev ntawm cov oxide, cov xim oxides qhia ntau yam xim, kom tag nrho cov xim titanium dioxide raug cuam tshuam los ntawm kev cuam tshuam thiab tsis yog dawb huv, yog li ntawd cov khoom zoo heev cuam tshuam. Yog li ntawd, ntau txoj kev yuav tsum tau siv los tshem tawm impurities.
1. Xaiv cov ore kom tshem tawm impurities
Txhawm rau tshem tawm impurities, thawj qhov uas yuav tsum tau ua yog xaiv cov ntxhia. Vim hais tias ib qho ilmenite feem ntau yog tov nrog ib tug xov tooj ntawm cov hlab ntsha thiab co-existing, txuam, composite lwm yam minerals. Kev txais txiaj ntsig yog kev siv cov khoom sib txawv ntawm lub cev thiab tshuaj lom neeg ntawm cov zaub mov, siv ntau txoj hauv kev kom cais cov ilmenite ntawm lawv. Piv txwv li, lub ntiajteb txawj nqus tau txais txiaj ntsig ntawm lub txaj txaj, tuaj yeem tshem tawm feem ntau ntawm cov hlab ntsha hauv cov hlau cam khwb cia, thiab tom qab ntawd sib nqus tshuab sib nqus sib nqus sib nqus, kom cov zaub mov los ntawm cov hlau nplaum sib nqus, raws li ilmenite yog cov permeability siab, tuaj yeem nyiam. mus rau cov hlau nplaum thiab tsis tuaj yeem nqus hlau nws tus kheej, tuaj yeem sib nqus thiab demagnetized paramagnetic minerals, thiab tuaj yeem cuam tshuam rau lub disk, lwm yam tsis tshua muaj permeability ntawm non-tilmenite, tsis tuaj yeem attracted rau disk thiab sib cais.
2. Tshem tawm insoluble impurities
Sulfuric acid txoj kev ntawm kev tsim cov titanium dioxide, los ntawm cov kua qaub leaching yog turbid titanium kua, nws cov insoluble impurities feem ntau yog cov khoom loj ntawm cov neeg kho tshuab impurities thiab me me ntawm colloidal impurities. Mechanical impurities tsis hnov mob titaniferous minerals, nyob rau hauv lub xeev ntxhib dispersion, nws yog ib qho yooj yim rau precipitate; colloidal impurities feem ntau yog aluminosilicate, thiab lwm yam, vim hais tias me me, adsorption H thiab nrog tib tus nqi zoo, vim tib lub nqi zog, cov khoom colloidal yog ib qho nyuaj rau kev mus rau hauv ib qho loj me me thiab nag lossis daus, thiab yog li muaj qhov siab. degree ntawm stability. Txoj kev daws teeb meem yog siv qhov tsis zoo them nyiaj hloov pauv polyacrylamide colloid rau hluav taws xob neutralize cov colloidal hais thiab tshem tawm los ntawm coagulation thiab sedimentation. Txawm li cas los xij, raws li cov colloid nyob tsis tiav, tom qab kev pom ntawm ferrous sulphate, tseem muaj qee qhov los ntawm kev pom thiab muaj nyob rau hauv titanium kua, uas yuav tsum tau lim nrog lub phaj thiab thav duab lim xovxwm nrog charcoal hmoov raws li cov lim pab txheej, kom txog rau thaum cov kua titanium yog lim. clarity ntawm cov filtrate yog kuaj thiab tsim nyog.
3. Tshem tawm cov hlau impurities
Qhov ntau tshaj uas tsis yog-titanium impurity nyob rau hauv ilmenite yog hlau, thiab muaj nyob rau hauv ob lub divalent thiab trivalent xeev. Los ntawm kev sib txuas ilmenite nrog sulfuric acid, FeSO thiab (SO) raug tsim. Raws li FeSO tsuas yog pib hydrolyse ntawm pH ntau dua 6.5, FeSO tseem yaj thaum lub sij hawm hydrolysis ntawm cov tshuaj titanium, uas yog acidic dua, thiab raug tshem tawm thaum ntxuav nrog metatitanic acid. Thiab Fe (SO) nyob rau hauv pH ntawm 1.7 acidic tov uas yog pib ntawm hydrolysis los tsim Fe (OH) precipitate, uas yog tov nyob rau hauv lub titanium acid, calcination yog generated thaum lub liab-xim av FeO thiab cov khoom tiav tsis huv. dawb. Txhawm rau kom ntseeg tau tias tag nrho cov hlau trivalent nyob rau hauv cov tshuaj titanium raug txo kom divalent hlau, qhov txo cov tshuaj tiv thaiv yuav tsum tau me ntsis ntau dhau, thaum cov tshuaj titanium muaj ib feem me me ntawm tetravalent titanium txo rau trivalent titanium. Lub xub ntiag ntawm trivalent titanium yuav xyuas kom meej tias cov hlau trivalent yuav txo tau tag nrho thiab tuaj yeem zam cov hydrolysis ntawm trivalent hlau los tsim Fe (OH) thiab yog li cuam tshuam rau cov khoom dawb. Tom qab txo qis, cov tshuaj titanium yog tag nrho FeSO, lub sijhawm no cov titanium khov kho, Fe uas yog kom ncav cuag lub xeev ntawm supersaturation thiab muaj coob tus crystalline nag lossis daus, pom tau tshem tawm feem ntau ntawm cov hlau titanium tov nyob rau hauv seem uncrystallized FeSO, yuav tsum tau hydrolyzed los tsim metatitanic acid rau cov dej ntxuav, nrog dej ntxuav kom tshem tawm. Raws li FeO pawg feem ntawm lub ncuav mog qab zib lim ntau tshaj 90 x 10, qhov dawb ntawm cov khoom yuav raug cuam tshuam. Yog li kev tshuaj dawb tuaj yeem ua rau txo qis FeO pawg rau 30 x 10 thiab ntxiv tshem tawm cov kab ntawm vanadium chromium, tooj liab thiab lwm yam impurities.
Rau titanium dioxide, ntxiv rau kev tsim tawm ntawm qee qhov kev ntsuas los txhim kho whiteness, qhov tseem ceeb nyob rau hauv kev tshem tawm impurities, impurities ntawm lub whiteness ntawm qhov tsis zoo tshwm sim yog loj heev, ntau kom huv si tshem tawm impurities, qhov siab dua qhov whiteness ntawm cov khoom. , uas yog qhov tseem ceeb tshaj rau kev siv hauv coatings.
