Txoj Kev Ua Iron Free Aluminium Sulfate

Kev npaj ntawm 2Al (OH) 3+3H2SO4=Al2 (SO4) 3+6H2O + Q aluminium hydroxide hmoov los ntawm kev ntxiv sulfuric acid rau txhuas hydroxide. Hlau tau raug tshem tawm ntawm lub Hoobkas, ua rau cov hlau tsis tshua muaj nyob hauv aluminium sulfate. Cov khoom tsim aluminium sulfate suav nrog cov khoom txhuas sulfate thiab kua txhuas sulfate. Cov ntsiab lus Al2O3 hauv cov khoom txhuas sulfate yog 15.8-17%, thaum Al2O3 cov ntsiab lus hauv aluminium hydroxide hmoov yog 64-65%. Kev thauj 1 tuj ntawm txhuas hydroxide hmoov yog sib npaug rau thauj 4 tons ntawm cov khoom txhuas sulfate. Txawm li cas los xij, tus nqi ntawm cov concentrated sulfuric acid hauv zos yog pheej yig, yog li tus nqi tsim khoom ntawm reacting aluminium hydroxide hmoov nrog concentrated sulfuric acid yog tsawg.
Txoj kev tshem tawm cov poov tshuaj permanganate hlau
Cov tshuaj txhuas sulfate raug kho rau pH 3.0 nrog txhuas hydroxide. Nyob rau hauv cov huab cua kub, divalent hlau yog oxidized rau trivalent hlau nrog ib tug 5% (qhov loj feem) poov tshuaj permanganate tov, tsim hlau hydroxide thiab manganese dioxide precipitates. Cov nag lossis daus yog txias rau 60 degree thiab lim. Cov lim residue raug muab pov tseg kom ua tiav cov nyhuv tshem tawm hlau. Cov filtrate yog concentrated thiab crystallized kom tau txais cov khoom kawg. Tom qab tshem tawm cov hlau los ntawm poov tshuaj permanganate oxidation ntawm txhuas sulfate, qhov loj feem ntawm cov hlau hauv txhuas sulfate tuaj yeem txo qis qis dua 0.01%, uas tuaj yeem ua tiav lub hom phiaj ntawm kev tsim cov hlau tsis tshua muaj hlau txhuas sulfate.
Cov txheej txheem extraction
Lub extraction ntawm hlau yog heev complex. Nws yog cuam tshuam los ntawm ntau yam nruab nrab, cov qauv ntawm cov extractant, muaj pes tsawg leeg ntawm cov extraction system, thiab lwm yam. Yog li ntawd, kev siv cov txheej txheem rho tawm yuav tsum tau ua kom zoo thiab ua tib zoo kawm rau cov xwm txheej tshwj xeeb, thiab tsuas yog tuaj yeem siv rau hauv kev lag luam tom qab ua tiav qee qhov kev sim.
Tom qab H: O: oxidation, aluminium sulfate tov yog muab rho tawm los ntawm kev ntxiv 2608 sulfonated kerosene tov uas muaj 20% (mass feem) N1923. Lub resulting aqueous theem yog aluminium sulfate tov, uas yog ces concentrated kom tau refined txhuas sulfate. Organic theem tau ntxiv nrog dilute sulfuric acid rau 4-theem countercurrent extraction kom rov qab tau cov organic extractants. Noj thawj amine extraction ua piv txwv, hlau raug tshem tawm los ntawm kev rho tawm nrog thawj amine N1923 thiab sulfonated kerosene organic solvents. Cov khoom zoo ntawm aluminium sulfate yog dawb, nplua-grained crystals, thiab nws cov ntaub ntawv qhia tau qhia nyob rau hauv Table 3. Fe: O nyob rau hauv txhuas sulfate tom qab tshem tawm hlau. Cov qhab nia zoo tuaj yeem txo mus rau 0.051%