Kev tsim cov Chromium Daj los ntawm Electroplating Hluav Taws Xob Cua Kub Tube Siv Ntshiab Alkali ua Precipitator
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Kev tsim cov Chromium Daj los ntawm Electroplating Hluav Taws Xob Cua Kub Tube Siv Ntshiab Alkali ua Precipitator
2.2 Kev tsim cov chrome daj: Ntshiab alkali yog siv los ua cov hmoov av kom tshem tawm cov impurities thiab hlau ions los ntawm electroplating wastewater, thiab ces purified electroplating wastewater yog siv los hloov ib co sodium alum los ua lead chrome daj. Tom qab ntxiv Na2CO3 saturated tov rau hauv cov tshuaj electroplating, kho cov pH rau 8.5 ~ 9.5. Lim thiab khaws cov filtrate. Nyob rau hauv alkaline tej yam kev mob, Cr3 ntxiv nyob rau hauv lub lim residue yog oxidized rau Cr6 ntxiv nrog H2O2, thiab ces lim. Cov filtrate yog tov nrog cov lus hais saum toj no. React cov filtrate nrog lead nitrate tov thiab additives ntawm 50-60 degree rau 1 teev, ces lim thiab ntxuav nrog dej kom tshem tawm cov chloride, sulfate, thiab lwm yam tsis muaj soluble impurities, thiab ces qhuav thiab crushed kom tau tiav cov hlau lead chrome daj. Kev tsim cov hlau lead chrome daj los ntawm electroplating cov dej khib nyiab tsis tsuas yog daws cov teeb meem muaj kuab paug, tab sis kuj rov ua dua cov chromium hauv cov dej khib nyiab electroplating. Nws tau kwv yees tias los ntawm kev kho 200 tons ntawm electroplating cov dej khib nyiab txhua xyoo thiab rov qab tau qhov nruab nrab ntawm 18 tons ntawm sodium alum txhua xyoo, cov nyiaj tau los txhua xyoo ntawm ntau dua 40000 yuan tuaj yeem ua tiav. Cov txiaj ntsig zoo heev.
2.3 Kev tsim cov kua chrome tanning tus neeg sawv cev thiab tawv tanning tus neeg sawv cev. Alkaline chromium sulfate uas muaj cov kua khib nyiab yog thawj zaug tshem tawm nrog sodium hydroxide los tswj cov hlau ion impurities, pH =5 5-6.0, thiab tom qab ntawd lim. Cov filtrate yog npaj rau kev siv, thiab cov sludge yog kho tsis muaj teeb meem nrog ferrite. Tom qab ntawd, txo tus neeg sawv cev qabzib tau ntxiv rau cov lim kom txo Na2Cr2O7 rau Cr (OH) SO4. Ntxiv polymerization tau ua tiav ntawm 100 degree, thiab thaum alkalinity yog 40 feem pua, cov mis molecular yog 4Cr (OH) 3˙ 3Cr2 (SO4) 3, uas yog chrome tanning tus neeg sawv cev. Lub Hoobkas tawv hauv Wuji County, Hebei Xeev siv cov dej khib nyiab electroplating uas muaj chromium los ua kua chrome tanning cov neeg ua haujlwm. Los ntawm kev tsim 5t ntawm cov kua chrome tanning tus neeg sawv cev ib hnub, ib hnub tau txais txiaj ntsig ntau dua 6000 yuan. Nws tuaj yeem pom tias cov txiaj ntsig kev lag luam ntawm kev siv chromium uas muaj cov kua khib nyiab los tsim cov chrome tanning cov neeg ua haujlwm tseem ceeb heev. Tsis tas li ntawd, chromium uas muaj sludge tuaj yeem tov nrog cov hmoov carbon thiab calcined ntawm qhov kub thiab txias kom tau txais cov xim hlau chromium. Vim tias chromium muaj sludge yog hom sludge tseem ceeb hauv kev cob qhia electroplating, kev rov ua dua thiab siv cov sludge txawv nyob ntawm txoj kev kho electroplating. Electrolytic sludge: (1) ua raw khoom rau nruab nrab kub hloov catalyst; (2) Cov khoom siv raw rau ua hlau chromium liab pigments. Tshuaj sludge: (1) Rov qab ntawm chromium hydroxide; (2) Rov ua dua chromium trioxide polishing paste. Ferrite sludge yog siv los ua raw khoom rau cov khoom sib nqus, thiab lwm yam.
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