Cov nyhuv ntawm Ntxiv Phosphoric Acid rau Titanium Dioxide
Hauv kev tsim cov electrode qib titanium dioxide, vim muaj cov ntsiab lus phosphorus siab ntawm titanium dioxide, nws txias thiab nkig rau qhov vuam, yog li cov ntsiab lus phosphorus ntawm titanium dioxide yuav tsum tsis pub tshaj 0.05 feem pua. Nyob rau hauv txoj kev no, phosphoric acid tsis tuaj yeem ntxiv rau hauv kev tsim khoom, thiab kev tswj nruj, tshwj xeeb tshaj yog cov ntsiab lus phosphorus siab tsis raug tso cai rau hauv qhov chaw ore. Txawm li cas los xij, hauv kev tsim cov tshuaj anatase titanium dioxide pigments, tsis tsuas yog tsis muaj phosphorus nruj, tab sis phosphoric acid lossis lwm cov ntsev yuav tsum tau ntxiv los txhim kho cov xim dawb thiab huab cua tsis kam ntawm titanium dioxide. Txawm li cas los xij, phosphorus ntau dhau hauv titanium ore tsis zoo, vim tias phosphorus muaj nyob rau hauv daim ntawv ntawm phosphoric acid lossis dihydrogen phosphate tom qab acidolysis, thiab nws yooj yim los ua ke nrog titanium los tsim cov titanium ntsev tsis sib haum. Raws li cov residue raug tshem tawm, titanium rov qab tshwm sim. tus nqi txo.
Raws li qhov tseeb hais tias nyob rau hauv zus tau tej cov anatase titanium dioxide, pH tus nqi ntawm metatitanic acid yog tseem nyob nruab nrab ntawm 2 thiab 3 tom qab ntxuav los yog bleaching, thiab ferrous sulfate tseem tsis tau mus txog nws hydrolysis pH nqi ntawm 6.5, thiab tseem muaj raws li ferrous ions. . Qee cov tuam ntxhab tsis muaj cov txheej txheem bleaching. Ib feem ntawm cov hlau ferrous yog oxidized los ntawm cov pa oxygen yaj hauv dej thaum ntxuav los ua ferric hlau. Thaum cov ferric hlau ntxuav mus rau pH tus nqi ntawm 1.5, nws yuav raug hydrolyzed los ua ferric hydroxide precipitate, uas yog tov nyob rau hauv ib nrab titanium qaub. Yog hais tias cov divalent hlau thiab hlau hydroxide impurities raug xa ncaj qha mus rau calcination yam tsis tau kho, liab-xim av hlau oxide yuav raug tsim nyob rau hauv calcination tej yam kev mob, uas yuav zoo heev cuam tshuam lub whiteness ntawm titanium dioxide. Yog li ntawd, kev kho ntsev yuav tsum tau ua ua ntej calcination. Ntxiv qhov tsim nyog ntawm phosphoric acid lossis lwm cov ntsev hauv kev kho ntsev kom phosphoric acid hnov mob nrog ferric hydroxide los ua lub teeb daj ruaj khov hlau phosphate; react phosphoric acid nrog divalent hlau los ua dawb los yog tawm-dawb Ferrous phosphate monobasic los yog dibasic ntsev, cov divalent hlau phosphates kuj oxidized rau lub teeb daj ferric phosphate nyob rau hauv calcination tej yam kev mob. Txij li thaum lub teeb daj hlau phosphate nyob deb dua li cov xim liab-xim av hlau oxide, cov nyhuv ntawm cov xim dawb ntawm titanium dioxide yog me dua, thiaj li ua tiav lub hom phiaj ntawm kev txhim kho cov xim dawb ntawm titanium dioxide.
