Kev kho cov dej khib nyiab uas muaj chromium hauv electroplating

Kev sib piv ntawm kev kho cov teebmeem ntawm ferrous sulfate thiab sodium bisulfite

Cov txheej txheem ntawm electroplating ntau lawm yuav tsum tau galvanized, thiab nyob rau hauv tus txheej txheem ntawm galvanized purification, yeej lub electroplating cog yuav siv chromate, yog li cov electroplating khib nyiab yuav tsim ib tug loj tus naj npawb ntawm chromium-muaj dej khib nyiab vim chromium plating.Cov chromium hauv cov dej khib nyiab uas muaj chromium muaj hexavalent chromium, uas yog tshuaj lom thiab tsis yooj yim rau tshem tawm.Hexavalent chromium feem ntau yog hloov mus rau trivalent chromium thiab tshem tawm.Rau kev tshem tawm ntawm chrome-muaj electroplating wastewater, tshuaj coagulation thiab nag lossis daus feem ntau yog siv los tshem tawm.Feem ntau siv yog ferrous sulfate thiab txiv qaub txo los nag txoj kev thiab sodium bisulfite thiab alkali txo nag lossis daus txoj kev.

1. ferrous sulfate thiab txiv qaub txo los nag txoj kev

Ferrous sulfate yog ib qho muaj zog acid coagulant nrog muaj zog oxidation-txo cov khoom.Ferrous sulfate tuaj yeem txo ncaj qha nrog hexavalent chromium tom qab hydrolysis hauv cov dej khib nyiab, hloov mus rau hauv ib feem ntawm trivalent chromium coagulation thiab nag lossis daus, thiab tom qab ntawd ntxiv txiv qaub los kho tus nqi pH txog li 8 ~ 9, kom nws tuaj yeem pab cov tshuaj tiv thaiv coagulation. tsim chromium hydroxide nag lossis daus, cov nyhuv tshem tawm ntawm chromate tuaj yeem ncav cuag li 94%.

Ferrous sulfate ntxiv rau txiv qaub coagulant txo chromate nag lossis daus muaj txiaj ntsig zoo ntawm chromium tshem tawm thiab tus nqi qis.Qhov thib ob, tsis tas yuav tsum tau kho tus nqi pH ua ntej qhov sib ntxiv ntawm ferrous sulfate, thiab tsuas yog yuav tsum tau ntxiv txiv qaub los kho tus nqi pH.Txawm li cas los xij, vim tias qhov ntau ntawm ferrous sulfate dosing kuj ua rau muaj qhov loj ntawm cov av nkos, ua rau tus nqi kho sludge.

2,.sodium bisulfite thiab alkali txo los nag txoj kev

Sodium bisulfite thiab alkali txo nag lossis daus chromate, pH ntawm cov dej khib nyiab tau hloov mus rau ≤2.0.Tom qab ntawd sodium bisulfite yog ntxiv kom txo cov chromate rau trivalent chromium, thiab cov dej khib nyiab nkag mus rau hauv lub pas dej ua ke tom qab txo qhov ua tiav, cov dej khib nyiab tau muab tso rau hauv lub pas dej regulating rau kev hloov kho, thiab tus nqi pH raug kho li ntawm 10 los ntawm kev ntxiv alkali. nodes, thiab tom qab ntawd cov dej khib nyiab tawm mus rau hauv lub tank sedimentation kom precipitate chromate, thiab tus nqi tshem tawm tuaj yeem ncav cuag li 95%.

Cov txheej txheem ntawm sodium bisulfite thiab alkali txo nag lossis daus chromate yog qhov zoo rau kev tshem tawm cov chromium, thiab nws cov nqi kuj siab dua ferrous sulfate, thiab lub sijhawm kho cov tshuaj tiv thaiv yog ntev dua, thiab pH tus nqi yuav tsum tau kho nrog acid ua ntej kev kho mob.Txawm li cas los xij, piv nrog kev kho ferrous sulfate, nws yeej tsis tsim cov sludge ntau dhau, txo tus nqi ntawm cov sludge kho, thiab cov sludge kho feem ntau yuav rov qab siv dua.