Raws li cov ntaub ntawv, ib lub pob roj teeb tuaj yeem ua paug rau 600000 litres dej, uas tuaj yeem siv los ntawm ib tus neeg mus rau lub neej. Yog hais tias ib ntu ntawm No.1 roj teeb raug muab pov rau hauv thaj chaw uas cog qoob loo, 1 square meter ntawm thaj av nyob ib puag ncig lub roj teeb pov tseg no yuav ua rau tsis muaj zog. Vim li cas thiaj ua tau zoo li no? Vim tias cov roj teeb khib nyiab no muaj ntau cov hlau hnyav. Piv txwv li: zinc, txhuas, cadmium, mercury, thiab lwm yam. Cov hlau hnyav no nkag mus rau hauv dej thiab nqus los ntawm cov ntses thiab cov qoob loo. Yog tias tib neeg noj cov ntses, cw thiab qoob loo uas muaj kab mob no, lawv yuav raug kev txom nyem los ntawm Mercury lom thiab cov kab mob hauv lub paj hlwb, nrog rau kev tuag txog li 40%. Cadmium raug txheeb xyuas raws li Class 1A Carcinogen.

Cov roj teeb khib nyiab muaj cov hlau hnyav xws li mercury, cadmium, manganese, thiab lead. Thaum lub ntsej muag ntawm cov roj teeb yog corroded vim lub hnub ci thiab nag, cov khoom hnyav hlau sab hauv yuav nkag mus rau hauv av thiab dej hauv av. Yog tias tib neeg noj cov qoob loo uas tsim los ntawm cov av tsis huv lossis haus cov dej tsis huv, cov hlau hnyav hnyav no yuav nkag mus rau tib neeg lub cev thiab maj mam tso, ua rau muaj kev hem thawj rau tib neeg kev noj qab haus huv.

Tom qab cov mercury hauv cov roj teeb pov tseg overflows, yog tias nws nkag mus rau tib neeg lub hlwb hlwb, lub paj hlwb yuav raug puas tsuaj loj. Cadmium tuaj yeem ua rau lub siab thiab lub raum puas tsuaj, thiab thaum mob hnyav, pob txha deformation. Qee lub roj teeb pov tseg kuj muaj cov kua qaub thiab cov hlau hnyav, uas tuaj yeem ua rau cov av thiab dej muaj kuab paug yog tias xau rau hauv qhov xwm txheej, thaum kawg ua rau muaj kev phom sij rau tib neeg.
Txoj kev kho roj teeb

1. Kev faib tawm
Tshem cov roj teeb uas siv tau rov qab, rub lub plhaub zinc thiab cov hlau hauv qab ntawm lub roj teeb, tshem tawm lub hau tooj liab thiab graphite pas nrig, thiab cov teeb meem dub uas tseem tshuav yog qhov sib xyaw ntawm Manganese dioxide thiab ammonium chloride siv los ua lub roj teeb tseem ceeb. Sau cov khoom saum toj no cais thiab ua lawv kom tau txais qee yam tseem ceeb. Cov graphite pas nrig yog ntxuav, qhuav, thiab ces siv raws li ib tug electrode.

2. Zinc granulation
Ntxuav lub plhaub zinc stripped thiab muab tso rau hauv lub lauj kaub hlau cam khwb cia. Tshav kub kom yaj thiab ua kom sov li 2 teev. Tshem tawm cov txheej sab sauv ntawm cov quav, ncuav nws kom txias, thiab muab tso rau ntawm lub phaj hlau. Tom qab solidification, zinc particles tau txais.

3. Recycling tooj liab ntawv
Tom qab flattening lub hau tooj liab, ntxuav nws nrog dej kub, thiab tom qab ntawd ntxiv ib qho nyiaj ntawm 10% sulfuric acid rau boil rau 30 feeb kom tshem tawm cov oxide txheej. Tshem tawm, ntxuav, thiab qhuav kom tau txais cov sawb tooj liab.

4. Rov qab ntawm ammonium chloride
Muab cov khoom dub tso rau hauv lub tog raj kheej, ntxiv 60oC dej sov thiab do rau 1 teev kom yaj tag nrho cov ammonium chloride hauv dej. Cia nws nyob twj ywm, lim, thiab ntxuav cov lim seem ob zaug, thiab sau cov cawv niam; Tom qab niam cawv yog Nqus distillation kom txog rau thaum ib tug dawb siv lead ua zaj duab xis tshwm nyob rau saum npoo, nws yog txias thiab lim kom tau ammonium chloride crystals, thiab niam cawv yog recycled.

5. Rov qab ntawm Manganese dioxide
Ntxuav cov lim dej uas seem nrog dej rau peb zaug, lim nws, muab lub ncuav mog qab zib tso rau hauv lub lauj kaub thiab ua kom sov kom tshem tawm cov pa roj carbon me ntsis thiab lwm yam organic, tom qab ntawd muab tso rau hauv dej thiab do tag nrho rau 30 feeb, lim nws, qhuav lub ncuav mog qab zib lim ntawm 100-110oC kom tau cov Manganese dioxide dub.

6. Kev ua kom muaj zog, sib sib zog nqus faus, thiab khaws cia hauv cov mines tso tseg
Piv txwv li, ib lub Hoobkas hauv Fab Kis tau rho cov npib tsib xee thiab cadmium los ntawm nws, uas tom qab ntawd siv rau steelmaking, thaum cadmium rov qab siv rau hauv cov roj teeb. Tag nrho cov roj teeb pov tseg feem ntau yog thauj mus rau qhov tshwj xeeb toxic thiab pov tseg pov tseg pov tseg, tab sis qhov kev xyaum no tsis tsuas yog siv nyiaj ntau dhau, tab sis kuj ua rau cov khoom pov tseg, vim tias tseem muaj ntau yam khoom siv uas siv tau los ua raw khoom.