Cov txheej txheem kev siv feem ntau hauv cov nroj tsuag metallurgical suav nrog chav dav hlau nqus tsev vacuum crystallization, evaporation concentration khov crystallization, polymeric ferric sulfate, hlau filings, thiab diffusion dialysis. Kuj tseem muaj cov hlau oxide liab ammonia regeneration txoj kev, uas tsis tshua muaj siv vim nws cov khoom siv ntau thiab siv zog ntau. Lub peev xwm ntawm cov cuab yeej ua haujlwm feem ntau yog qhia nyob rau hauv cov nqe lus ntawm cov nyiaj sulfuric acid noj ib xyoos (concentration ntawm 98%) rau pickling steel. Feem ntau, cov khoom siv me me siv ib ncig ntawm 500t / a, thaum cov khoom loj siv 1000-3000t / a.
Steam jet nqus tsev vacuum crystallization method:ib txoj hauv kev tswj hwm ib qho kev nqus ntawm lub tshuab nqus tsev hauv cov evaporator thiab crystallizer los ntawm lub dav hlau cua thiab condenser. Thaum cov kua khib nyiab nrog qhov kub siab tshaj qhov kub ntawm qhov evaporation nyob rau hauv lub tshuab nqus tsev kawm ntawv no dhau mus, cov dej hauv cov kua khib nyiab evaporates hauv lub xeev adiabatic, ua rau txo qis hauv cov kua dej khib nyiab, qhov nce hauv concentration, thiab txo qis hauv cov dej khib nyiab. solubility ntawm ferrous sulfate. Nyob rau tib lub sijhawm, cov kua qaub tshiab ntxiv rau hauv cov evaporator kom cov kua qaub ntawm cov tshuaj ntxiv thiab ua kom cov kua qaub supersaturated ferrous sulfate crystals. Cov txheej txheem ntws tau pom nyob rau hauv daim duab 1. Qhov zoo ntawm txoj kev no yog tias nws tuaj yeem tswj tau cov kua khib nyiab ntau thiab tsis tu ncua tsim xya cov dej siv lead ua ferrous sulfate (FeSO4 • 7H2O) thiab cov kua qaub regenerated (muaj 10% mus rau 20% H2SO4 thiab 44% mus rau 8% FeSO). FeSO4 • 7H2O muaj purity ntau dua 95% thiab muaj tsawg dua 1% H2SO4. Tsis muaj kuab paug thib ob. Qhov tsis zoo yog tias cov kua qaub tshiab yuav tsum tau ntxiv thaum lub sij hawm ua, thiab tag nrho cov kua qaub ntxuav siv cov kua qaub regenerated. Chav injector nozzle yog nquag hnav thiab tsim kua muag.
Evaporation concentration freezing crystallization txoj kev:Cov kua khib nyiab yog thawj zaug hauv cov evaporator, thiab cov dej raug tshem tawm los ntawm lub tshuab nqus tsev vacuum kom nce acidity thiab concentration ntawm ferrous sulfate. Tom qab ntawd, nws raug xa mus rau lub tank crystallization thiab qhov kub ntawm cov kua khib nyiab yog qis dua mus rau 0-3 degree nrog cov dej ntsev khov rau precipitate ferrous sulfate crystals. Lub sijhawm khov crystallization feem ntau yog 2 teev. Qhov zoo ntawm txoj kev no yog tias nws tuaj yeem ua cov kua dej pov tseg ntau, muaj kev ua haujlwm siab evaporation, thiab ua rau xya siv lead ua dej ferrous sulfate. Thaum lub sij hawm kev kho mob, tsis xav tau cov kua qaub tshiab, thiab cov kua qaub tshiab yog siv ncaj qha rau steel pickling. Regenerated acid muaj 16% mus rau 20% H2SO4 thiab 5.5% mus rau 7% FeSO4. FeSO4 • 7H2O muaj purity ntau dua 95% thiab muaj tsawg dua 1% H2SO4. Qhov tsis zoo yog tias nws yuav tsum tau ua tiav cov khoom siv xws li lub freezer, uas yuav tsum muaj peev txheej loj, tus nqi siab, thiab kev ua haujlwm nyuaj. Graphite evaporators yooj yim rau thaiv los ntawm ferrous sulfate crystals. Lub raj tooj liab hauv lub tank crystallization yog corroded los ntawm cov kua qaub thiab muaj lub neej ua haujlwm luv luv, yuav tsum tau hloov ntau zaus.
Polymeric ferric sulfate txoj kev:Ua ntej, cov kua khib nyiab yog pretreated, ces oxidized nrog oxygen, thiab NaNO2 yog siv los ua ib qho catalyst los tsim cov txheej txheem ferric sulfate polymer, uas yog polymeric ferric sulfate, uas yog siv los ua dej huv. Cov txheej txheem ntws tau qhia hauv daim duab 3. Txoj kev no tuaj yeem tswj cov kua dej khib nyiab tsim nyob rau ntau qhov xwm txheej, nrog kev ua haujlwm tsis sib xws thiab lub voj voog ntau lawm ntawm 2 teev. Polymeric ferric sulfate muaj 12.5% mus rau 13.5% Fe2O3, cov lej ntawm Fe2+, qhov ceev ntawm 1.45 txog 1.50g / cm3, alkalinity ntawm 10% mus rau 13%, thiab pH tus nqi ntawm 0.5 txog 1.0. Nws cov txheej txheem cov cuab yeej yog qhov yooj yim, nrog kev nqis peev tsawg thiab tsis muaj kuab paug thib ob.
Iron filings method:Cov kua qaub dawb nyob rau hauv cov kua khib nyiab reacts nrog hlau filings los tsim ferrous sulfate, uas yog ces concentrated los ntawm cua sov thiab lawm txias kom crystallize thiab precipitate. Txoj kev no muaj kev ua qias tuaj ib puag ncig, kev siv zog ua haujlwm siab, thiab cov kua dej uas tau tso tawm muaj li ntawm 0.15% H2SO4 thiab 421% FeSO, yuav tsum tau kho qhov nruab nrab. Tsuas yog siv tau rau kev kho cov kua khib nyiab tsawg.
Diffusion diffusion txoj kev:siv ion exchange membrane, diffusion dialysis, cais cov kua qaub dawb thiab ferrous sulfate hauv cov kua khib nyiab. Nws muaj kev siv hluav taws xob tsawg thiab ua haujlwm yooj yim. Regenerated acid muaj 140 ~ 180g / L H2SO4 thiab tsis pub ntau tshaj 10g / L FeSO4. Cov tshuaj residual muaj 20-30g/L H2SO4 thiab 10-120g/L FeSO4, thiab yuav tsum tau kho neutralization. Haum rau kev kho cov kua khib nyiab tsawg thiab silicon steel ntawv pickling khib nyiab kua.