Zinc sulfate heptahydrate tseem hu ua zinc vitriol thiab alum vitriol. Nws tus txheeb ze cov roj av yog 287.56. Nws cov tsos yog dawb hais lossis hmoov. Nws zwm rau OrthoORHombic Crystal system thiab nws cov kev txheeb ze yog 1.97. Nws maj mam huab cua nyob rau hauv huab cua qhuav. Cov txheej txheem tsim khoom tseem ceeb suav nrog cov qauv sulfuric acid thiab smithsonite txoj kev.
Cov sulfuric acid txuj ci yog siv los tsim zinc sulfate heptahydrate, uas siv sulfuric acid kom tsis txhob muaj cov khoom siv zinc lossis cov khoom siv tsis zoo los ntawm kev lag luam hlau ua lag luam thiab tsis- Ferrous metallical kev lag luam, thiab zinc slag thiab zinc mines, thiab lwm yam.
Zinc-muaj cov ntaub ntawv raug tsoo los ntawm pob zeb zeb thiab yaj nrog 18% rau 25% sulfuric acid. Kev tshem tawm yog nqa tawm hauv cov tshuaj tiv thaiv kab yees nrog cov kua qaub-resistant cov khoom, thiab nruab nrog lub stirrer. Cov tshuaj tiv thaiv cov tshuaj muaj raws li hauv qab no:
ZN + H2SO4 → ZSO4 + H2 ↑ ZNO + H2SO4 → ZSO4 + H2O
Cov tshuaj tiv thaiv yog exothermic thiab kub nce siab tshaj 80 ° C. Yog tias cov khoom muaj ntau ntau ntawm cov xim hlau zinc, muaj ntau ntau ntawm cov hydrogen yuav tsim tawm. Yog li ntawd, cov reactor yuav tsum tau nruab nrog lub zog tso pa tawm. Txhawm rau ua kom nrawm tus nqi ntawm cov tshuaj ntsuab tom qab cov tshuaj tiv thaiv, tshaj zinc-muaj cov ntaub ntawv ntxiv. Tus nqi pH thaum kawg ntawm cov tshuaj tiv thaiv yog tswj tau nyob ib ncig ntawm 51, thiab cov slurry yog qhia thiab lim. Cov ntaub ntawv zinc nyob rau hauv lub lim cov seem yuav tsum tsawg dua 5%. Ntxiv rau zinc sulfate, cov filltrate kuj muaj cov sulfate coj mus rau cov hlau impurities nyob rau hauv cov ntaub ntawv raw. Tshem tawm impurities tuaj yeem ua tau nyob rau hauv ob kauj ruam. Ua ntej, tooj liab, npib tsib xee, thiab lwm yam tau muab tshem tawm, thiab tom qab ntawd hlau tau raug tshem tawm. Qhov filtrate yog rhuab rau 80 ° C nyob rau hauv lub displacer, zinc ntxiv yog ntxiv, thiab cov sib tov yog sib xyaw ua rau 4 mus rau 6 teev. Txij li zinc muaj qhov txo qis dua tooj liab, npib tsib xee, thiab cadmium, cov hlau no tuaj yeem hloov pauv ntawm kev daws teeb meem. Cov tshuaj tiv thaiv cov tshuaj muaj raws li hauv qab no:
+ Cuso4 → ZSO4 + Cuzn + NISO4 → ZSO4 + Nizn + CDSO4 → ZSO4 + CD
Cov kev daws teeb meem hloov yog lim los ntawm siab kom tshem tawm cov av nkos zoo li hlau. Qhov frecidation xa mus rau oxidation zaub mov, rhuab rau 80 ° C, thiab sodium hypocanganate, mangacese dioxide, etc. tau ntxiv rau oxidize hlau. Tom qab oxidation, tus nqi tsim nyog ntawm txiv qaub ntxiv. Mis nyuj haus rau precipitate lub siab valent hlau hydroxide thiab ces lim nws tawm. Thaum siv cov hmoov tshuaj dawb, rhaub cov tshuaj daws tau tom qab daus kom rhuav tshem cov hmoov dawb do. Thaum siv cov poov tshuaj permanganate, zinc oxide tuaj yeem raug ntxiv los kho cov ntawv PHIC ntawm kev daws teeb meem rau 5.1 vim yog nag lossis daus dawb. Qhov filtrate yog qhov ua kom tiav los ntawm evaporation, txias rau hauv qab 25 ° C, thiab
Lub Sijhawm Post: Oct-30-2024
