Kev Tsim Kho Kev Kho Sodium Cyanide Wastewater nrog Hydrogen Peroxide

Introduction

Sodium cyanide yog ib yam tshuaj lom heev uas siv dav hauv kev lag luam xws li kev khawb av, electroplating, thiab kev tsim tshuaj lom neeg. Txawm li cas los xij, cov dej khib nyiab uas tsim los ntawm cov txheej txheem no muaj cov cyanide ntau heev, uas ua rau muaj kev phom sij rau ib puag ncig thiab tib neeg kev noj qab haus huv yog tias tsis kho kom zoo. Kev kho hydrogen peroxide tau tshwm sim ua ib txoj hauv kev zoo thiab muaj kev nyab xeeb rau kev daws cov dej khib nyiab uas muaj -Sodium Cyanide . Tsab xov xwm no nkag mus rau hauv kev coj ua ntawm kev siv Hydrogen Peroxide los kho cov dej khib nyiab no, suav nrog cov ntsiab lus los ntawm cov tshuaj tiv thaiv mus rau cov txheej txheem ua haujlwm tiag tiag.

Reaction Principles

Oxidation ntawm Cyanide los ntawm Hydrogen Peroxide

Qhov kev sib xyaw ntawm hydrogen peroxide thiab Sodium Cyanide yog ib qho txheej txheem oxidation - txo qis. Hauv cov kua dej, hydrogen peroxide ua haujlwm ua tus neeg sawv cev oxidizing. Nws oxidizes cov cyanide ion mus rau hauv cov tshuaj lom tsawg dua. Nyob rau hauv cov xwm txheej tsim nyog, hydrogen peroxide rhuav tshem cov khoom sib txuas hauv cyanide ion. Cov pa roj carbon hauv cyanide raug oxidized mus rau lub xeev oxidation siab dua, tsim cov ion tsis muaj teeb meem, thiab nitrogen raug tso tawm ua roj. Qhov kev sib xyaw no yog qhov tseem ceeb vim nws txo qhov kev lom ntawm cov dej khib nyiab.

Lub luag haujlwm ntawm Catalysts (xaiv tau)

Qee zaum, cov catalysts tuaj yeem muab ntxiv los ua kom cov tshuaj tiv thaiv ntawm hydrogen peroxide thiab cyanide. Piv txwv li, qee qhov kev hloov pauv hlau ions tuaj yeem ua cov catalysts hauv cov tshuaj tiv thaiv zoo ib yam li Fenton cov tshuaj tiv thaiv. Catalysts txo lub zog thaiv ntawm cov tshuaj tiv thaiv, tso cai rau oxidation ntawm cyanide tshwm sim sai dua ntawm qhov kub thiab txias thiab nrog tsawg dua hydrogen peroxide siv. Txawm li cas los xij, thaum siv cov catalysts, yam xws li tus nqi ntawm cov catalyst ntxiv, pH tswj, thiab muaj peev xwm ua kom muaj kuab paug los ntawm cov catalyst residues yuav tsum tau ua tib zoo xav.

Txheej txheem Flow nyob rau hauv ntau lawm xyaum

Pretreatment ntawm cov dej khib nyiab

Ua ntej kev kho hydrogen peroxide, cov dej khib nyiab uas muaj sodium cyanide feem ntau yuav tsum tau kho ua ntej. Cov kauj ruam no lub hom phiaj yog kho qhov pH ntawm cov dej khib nyiab kom haum. Feem ntau, pH raug kho kom haum rau qhov xwm txheej alkaline me ntsis, nyob ib puag ncig 8 - 10. Qhov no yog vim tias Oxidation Reaction ntawm hydrogen peroxide thiab cyanide ua haujlwm tau zoo dua hauv ib puag ncig alkaline. Tsis tas li ntawd, kev kho ua ntej yuav suav nrog kev tshem tawm cov khoom tsis huv loj, cov khoom khov, thiab lwm yam uas tuaj yeem cuam tshuam cov txheej txheem kho tom qab. Cov txheej txheem lim dej xws li cov lim xuab zeb lossis cov lim membrane tuaj yeem siv rau lub hom phiaj no.

Hydrogen Peroxide Ntxiv

Tom qab ntawd, yuav muab cov hydrogen peroxide ntau npaum li cas ntxiv rau hauv cov dej khib nyiab uas tau kho ua ntej lawm. Qhov ntau npaum li cas ntawm hydrogen peroxide yog txiav txim siab raws li qhov concentration ntawm cyanide hauv cov dej khib nyiab. Feem ntau, kev xam zauv ua ntej ua raws li cov tshuaj lom neeg. Tab sis thaum tsim khoom tiag tiag, feem ntau yuav muab cov hydrogen peroxide ntau dhau los xyuas kom meej tias cov cyanide oxidation tiav. Qhov concentration ntawm hydrogen peroxide siv rau hauv kev siv hauv kev lag luam feem ntau yog nyob rau hauv qhov ntau ntawm 30% - 50%. Kev ntxiv cov hydrogen peroxide tuaj yeem ua tiav los ntawm cov twj ntsuas, uas tuaj yeem tswj tau qhov nrawm thiab qhov ntau ntawm hydrogen peroxide nkag mus rau hauv lub tank kho dej khib nyiab.

Cov tshuaj tiv thaiv thiab kev sib xyaw

Tom qab ntxiv hydrogen peroxide, cov dej khib nyiab yuav tsum tau muab sib xyaw kom huv si kom ntseeg tau tias kev sib cuag ntawm hydrogen peroxide thiab cyanide. Kev sib tov tuaj yeem ua tiav siv cov tshuab agitators, huab cua-tsav mixers, lossis ob qho tib si ua ke. Lub sij hawm cov tshuaj tiv thaiv txawv nyob ntawm seb yam xws li qhov pib cyanide concentration, kub, thiab muaj cov catalysts. Feem ntau, lub sijhawm tshuaj tiv thaiv tuaj yeem nyob ntawm ob peb teev mus rau kaum teev. Thaum lub sijhawm no, qhov ntsuas kub ntawm cov tshuaj tiv thaiv kuj yog qhov tseem ceeb. Txawm hais tias cov tshuaj tiv thaiv tuaj yeem tshwm sim ntawm chav tsev kub, qhov kub thiab txias nyob rau hauv ib qho chaw (feem ntau tsis tshaj 50 ° C) tuaj yeem ua kom cov tshuaj tiv thaiv sai. Txawm li cas los xij, kub dhau heev tuaj yeem ua rau decomposition ntawm hydrogen peroxide, txo nws cov txiaj ntsig hauv kev kho cyanide.

Post-kev kho mob

Thaum cov tshuaj tiv thaiv tiav lawm, cov kauj ruam kho tom qab yog tsim nyog. Ib qho tseem ceeb tshaj tom qab - kev kho mob yog tshem tawm cov residual hydrogen peroxide. Ntau dhau ntawm hydrogen peroxide nyob rau hauv cov dej khib nyiab kho tuaj yeem tsim kev puas tsuaj rau ib puag ncig thiab tseem tuaj yeem cuam tshuam nrog cov txheej txheem kev kho mob lom neeg tom ntej yog tias cov dej khib nyiab yuav tsum tau kho ntxiv hauv kev kho kab mob lom. Cov residual hydrogen peroxide tuaj yeem decomposed los ntawm kev ntxiv cov tshuaj txo qis xws li sodium sulfite lossis los ntawm kev siv cov txheej txheem catalytic decomposition. Tom qab tshem tawm cov residual hydrogen peroxide, cov dej khib nyiab kho tom qab ntawd nkag mus rau cov khoom siv - cov kua sib cais kom tshem tawm cov dej nag lossis cov khib nyiab tshem tawm thaum lub sijhawm kho. Sedimentation tanks, flotation devices, lossis filtration units tuaj yeem siv rau qhov no. Thaum kawg, cov dej khib nyiab kho tau raug tshuaj xyuas los xyuas seb cov cyanide concentration puas ua tau raws li cov qauv tso tawm.

Yam tseem ceeb cuam tshuam rau kev kho mob zoo

pH Tus Nqi

Raws li tau hais ua ntej, tus nqi pH ntawm cov dej khib nyiab muaj qhov cuam tshuam loj rau kev kho mob ntawm hydrogen peroxide. Nyob rau hauv ib puag ncig acidic, hydrogen peroxide yuav decompose sai sai rau hauv dej thiab oxygen, txo nws lub peev xwm los oxidize cyanide. Ntawm qhov tod tes, nyob rau hauv ib puag ncig alkaline heev, cov tshuaj tiv thaiv ntawm hydrogen peroxide thiab cyanide kuj tseem raug cuam tshuam. Qhov zoo tshaj pH ntau rau cov tshuaj tiv thaiv ntawm hydrogen peroxide thiab cyanide feem ntau yog nyob ib ncig ntawm 8 - 10. qhov twg cov tshuaj tiv thaiv tuaj yeem ua tau zoo thiab qhov decomposition ntawm hydrogen peroxide yog tsawg.

Kub

Qhov kub thiab txias plays lub luag haujlwm tseem ceeb hauv cov tshuaj tiv thaiv ceev. Kev nce hauv qhov kub thiab txias feem ntau ua rau cov tshuaj tiv thaiv ntawm hydrogen peroxide thiab cyanide. Txawm li cas los xij, raws li qhov kub thiab txias, qhov decomposition ntawm hydrogen peroxide kuj tseem ceeb dua. Thaum qhov kub siab tshaj 50 ° C, qhov decomposition ntawm hydrogen peroxide tuaj yeem sai heev uas nws txo cov nyiaj hydrogen peroxide rau oxidizing cyanide. Yog li ntawd, nyob rau hauv lub tswv yim ntau lawm, qhov kub thiab txias yuav tsum tau ua tib zoo tswj nyob rau hauv ib tug tsim nyog ntau yam kom sib npaug cov tshuaj tiv thaiv tus nqi thiab stability ntawm hydrogen peroxide.

Concentration ntawm Cyanide thiab Hydrogen Peroxide

Thawj qhov concentration ntawm cyanide nyob rau hauv cov dej khib nyiab txiav txim siab npaum li cas ntawm hydrogen peroxide xav tau kom tiav oxidation. Cyanide ntau dua yuav tsum muaj hydrogen peroxide ntau dua. Yog tias qhov ntau npaum ntawm hydrogen peroxide tsis txaus, oxidation ntawm cyanide yuav ua tsis tiav, ua rau cov dej khib nyiab kho tsis tau raws li cov qauv. Hloov pauv, ntxiv hydrogen peroxide ntau dhau tsis tsuas yog nce cov nqi kho mob xwb tab sis kuj yuav tsum muaj ntau txoj hauv kev - kev kho mob kom tshem tawm qhov dhau. Yog li ntawd, txiav txim siab qhov tseeb ntawm cyanide concentration hauv cov dej khib nyiab thiab kho cov tshuaj hydrogen peroxide kom raug yog qhov tseem ceeb rau kev kho kom zoo.

Case Study hauv Mining Industry

Hauv kev lag luam kub mining, ntau npaum li cas ntawm sodium cyanide yog siv rau hauv cov txheej txheem rho tawm kub, tsim cov cyanide ntau - muaj cov dej khib nyiab. Lub mine tau txais kev kho hydrogen peroxide - raws li kev kho mob. Ua ntej, cov dej khib nyiab tau sau rau hauv lub tank loj. Cov pH ntawm cov dej khib nyiab tau hloov mus rau 9 siv cov txiv qaub. Tom qab ntawd, 35% hydrogen peroxide tau ntxiv rau cov dej khib nyiab los ntawm lub tshuab ntsuas ntsuas. Cov nyiaj ntxiv tau suav nrog raws li cyanide concentration hauv cov dej khib nyiab, nrog me ntsis dhau los ua kom tiav oxidation.

Cov dej khib nyiab tau sib xyaw nrog cov neeg kho tshuab agitator rau 8 teev. Thaum lub sijhawm no, qhov ntsuas kub ntawm cov tshuaj tiv thaiv tau khaws cia nyob ib ncig ntawm 35 ° C los ntawm kev ua kom txias thiab cua sov. Tom qab cov tshuaj tiv thaiv, sodium sulfite tau ntxiv rau decompose cov residual hydrogen peroxide. Cov dej khib nyiab kho tau raug xa mus rau lub tank sedimentation rau cov khoom sib cais - kua. Cov supernatant tau txheeb xyuas, thiab cov txiaj ntsig tau pom tias cov cyanide concentration hauv cov dej khib nyiab kho tau poob qis los ntawm tus nqi pib ntawm 500 mg / L mus rau tsawg dua 0.5 mg / L, ua tau raws li cov qauv kev tso tawm ib puag ncig hauv zos. Cov ntaub ntawv no qhia tau hais tias qhov ua tau zoo ntawm cov txheej txheem kho hydrogen peroxide hauv qhov chaw tsim khoom hauv ntiaj teb tiag.

xaus

Kev kho cov dej khib nyiab Sodium Cyanide hydrogen peroxide yog ib txoj hauv kev ua tau zoo thiab siv tau zoo hauv kev tsim khoom lag luam. Los ntawm kev nkag siab txog cov ntsiab cai ntawm kev ua tshuaj, kev ua kom zoo dua ntawm cov txheej txheem, thiab kev tswj cov yam tseem ceeb xws li pH, kub, thiab cov tshuaj reagent, kev kho cov dej khib nyiab uas muaj cyanide zoo tuaj yeem ua tiav. Txawm li cas los xij, kev saib xyuas thiab kev hloov kho tas mus li yog qhov yuav tsum tau ua thaum lub sijhawm tsim khoom kom ntseeg tau tias kev kho mob ruaj khov thiab ua raws li cov cai ib puag ncig. Raws li cov kev cai ib puag ncig dhau los ua qhov nruj dua, txoj kev kho hydrogen peroxide rau cov dej khib nyiab sodium cyanide yuav tsum ua lub luag haujlwm tseem ceeb dua hauv kev tiv thaiv ib puag ncig.