Kev Tshawb Fawb Txog Kev Kho Mob ntawm Cyanide-Poor Liquid hauv Gold Mine

Introduction

Hauv kev lag luam khawb kub, kev kho cov kua cyanide -tsis zoo yog qhov tseem ceeb heev. Cov kua uas tsis muaj cyanide, xws li cov tshuaj tom qab rho kub hauv cov txheej txheem cyanidation, muaj ntau yam kuab paug, tshwj xeeb tshaj yog cov tshuaj cyanide, uas tuaj yeem ua rau muaj kuab paug rau ib puag ncig yog tias tsis kho kom zoo. Yog li ntawd, kev tsim cov txheej txheem kho mob zoo thiab pheej yig rau cov kua uas tsis muaj cyanide yog ib txoj haujlwm ceev. Cov ntawv blog no tsom mus rau kev kawm txog kev kho cov kua uas tsis muaj cyanide hauv qee lub qhov av kub , lub hom phiaj yog muab cov kev nkag siab zoo thiab cov ntaub ntawv siv rau kev lag luam.

Txheej txheem cej luam ntawm Cyanide-Poor Liquid Treatment Methods

Feem ntau, cov kev kho mob rau cyanide-cov kua tsis zoo tuaj yeem muab faib ua ob pawg: purification txoj kev thiab rov ua dua (rov ua dua tshiab).

Txoj Kev Purification

1.Alkali-Chlorine Oxidation Method

• Qhov no yog ib txoj kev loj hlob zoo rau kev rhuav tshem cov cyanides hauv cov dej khib nyiab thiab siv dav hauv cov nroj tsuag electroplating, cov nroj tsuag coking, thiab cov nroj tsuag smelting kub. Nyob rau hauv qhov xwm txheej ntawm pH 11 - 12. Cyanides thiab cov hlau sib xyaw ions hauv cov dej khib nyiab uas muaj cyanide raug oxidized rau hauv cyanates, thiab tom qab ntawd chlorine raug ntxiv rau lub sijhawm thib ob los oxidize lawv rau hauv Carbon dioxide, nitrogen, thiab lwm yam.

• Cov Zoo : Cov txheej txheem no laus zuj zus lawm, muaj cov txiaj ntsig zoo rau kev kho mob thiab siv tau dav. Cov txheej txheem kho mob tuaj yeem ua tau yooj yim.

• Qhov Tsis Zoo : Cov tshuaj cyanides tsis tuaj yeem rov ua dua tshiab, tus nqi kho mob siab, thiab nws tsis tuaj yeem tshem tawm cov tshuaj iron-cyanide. Kuj tseem muaj teeb meem ntawm kev ua qias tuaj zaum ob.

2.Sulfur Dioxide - Cua Oxidation Method

• Nyob rau hauv ib lub khob ntim, cov kua khib nyiab ntxiv, thiab cua thiab SO₂ (kua lossis roj, los yog sulfite tov, los yog tau los ntawm cov hluav taws xob hluav taws xob) tau qhia. Lub pH yog tswj ntawm 7 - 10. thiab txiv qaub yog siv los ua kom cov kua qaub uas tsim tawm thaum lub sij hawm oxidation. Cov tshuaj tiv thaiv yuav tsum muaj cov tooj liab soluble (raws li catalyst).

• Inco - SO₂ / huab cua oxidation txoj kev tuaj yeem decompose tag nrho cov cyanides, nrog rau cov hlau-cyanides, thiab hlau-cyanides tuaj yeem raug precipitated thiab tshem tawm siv qee qhov kev nyab xeeb thiab pheej yig reagents.

3.Hydrogen Peroxide Method

• Cov txheej txheem no tsim nyog rau kev kho cov dej khib nyiab uas muaj cyanide tsawg. Hydrogen peroxide tuaj yeem oxidize cyanide hauv tailings rau hauv qhov tsis muaj zog thiab yooj yim hydrolyzed cyanic acid (HCNO), uas tom qab ntawd tshem tawm los ntawm kev ntxiv oxidation thiab hydrolysis.

4.Ozone Oxidation Method

• Ozone yog ib qho muaj zog oxidizing tus neeg sawv cev. Thaum siv los kho cov dej khib nyiab uas muaj cyanide, nws ua tiav ntau dua li alkali-chlorine oxidation txoj kev, nrog zoo cyanide tshem tawm cov teebmeem. Tom qab ozonation, cov pa oxygen yaj hauv cov dej khib nyiab nce ntxiv, uas tuaj yeem rov qab mus rau cyanidation system rau kev rov ua dua tshiab, ua kom yooj yim rau kev tawg ntawm kub thiab txhim kho cov kub leaching efficiency.

• Cov Zoo : Kev ua haujlwm yooj yim thiab yooj yim, yooj yim tswj, thiab qib kev ua haujlwm tsis siv neeg siab. Ozone tuaj yeem tsim tau ntawm qhov chaw, uas yog qhov tseem ceeb heev rau cov nroj tsuag cyanidation uas tsis yooj yim thauj mus los tab sis muaj hluav taws xob txaus. Kev ua haujlwm huv siab, thiab tsis muaj kev ua qias tuaj ntxiv.

• Qhov tsis zoo : Kev siv hluav taws xob rau kev tsim ozone yog loj, thiab tus nqi tsim khoom siab, uas txwv nws daim ntawv thov dav.

5.Electrolytic Oxidation Method

• Ua ntej electrolysis, ua ntej kho cov pH ntawm cov kua cyanide-tsis zoo rau> 7. Ntxiv ib me ntsis ntsev, siv graphite li anode thiab titanium phaj li cathode, thiab siv ib tug alkaline tooj liab - zinc aqueous tov raws li cov electrolyte. Thaum cov hluav taws xob ncaj qha dhau mus, hlau tooj liab thiab zinc yog tsim los ntawm cathode, thiab hydrogen kuj tsim. Ntawm lub anode, CN⁻ yog oxidized rau hauv CNO⁻, CO₂, N₂, thiab Cl⁻ yog oxidized rau hauv Cl₂, thiab Cl₂ nkag mus rau hauv cov tshuaj los tsim HClO.

6.Microbial Oxidation Method

• Txoj kev no siv cov khoom siv biochemical ntawm cov kab mob kom decompose cyanides, thiocyanates, thiab hlau-cyanides, tsim cov ammonia, carbon dioxide, thiab sulfates, los yog hydrolyzing cyanides rau hauv formamide. Nyob rau tib lub sijhawm, cov kab mob adsorb hnyav hlau ions, ua rau lawv poob nrog biofilm thiab raug tshem tawm.

• Tseem Ceeb : Qhov kub yuav tsum tau tswj kom siab tshaj 10 ℃ txhua lub sijhawm kom tswj tau qhov kev tshem tawm cyanide tsim nyog.

Rov qab (Regeneration) Methods

1.Acidification txoj kev

• Lub hauv paus ntsiab lus ntawm txoj kev no yog ntxiv sulfuric acid rau cov dej khib nyiab uas muaj cyanide, kho cov pH txog li 1.5. thiab hloov CN⁻ rau HCN. Cov pa tawm HCN tau nkag mus rau hauv lub nqus nqus thiab nqus los ntawm cov tshuaj alkaline (sodium hydroxide lossis calcium hydroxide tov) kom tau txais 20% - 30% cyanide tov, uas tuaj yeem siv dua.

• Cov Zoo : Cov txheej txheem no tuaj yeem ua kom rov qab tau cov cyanides ntau tshaj plaws, txhim kho kev siv cov cyanides zoo, thiab txo cov nqi tsim khoom.

• Qhov Tsis Zoo : Tus nqi peev ib zaug yog loj, cov txheej txheem ntws nyuaj, thiab nws nyuaj rau cov kua dej uas muaj cyanide kho kom ua tau raws li cov qauv tso tawm.

2.Ion Exchange Method

• Hauv kev kho cov kua dej tsis zoo, ion txauv resins tuaj yeem siv los txhawb cov cyanide.

3. Txoj kev Adsorption

• Kev Nqus Cov Pa roj Carbon Activated : Kev nqus cov pa roj carbon activated feem ntau nyob ntawm nws cov qhov ntau thiab qhov chaw loj. Cov txheej txheem nqus suav nrog kev nqus lub cev thiab kev nqus tshuaj. Kev tshem tawm cyanide feem ntau muaj peb txoj hauv kev: oxidation, hydrolysis, thiab stripping. Cov txheej txheem tseem ceeb yog qhov oxidative decomposition ntawm cyanides hauv cov dej khib nyiab uas muaj cyanide nrog hydrogen peroxide rau ntawm qhov chaw ntawm cov pa roj carbon activated.

4.Solvent Extraction Method

• Cov kuab tshuaj yog siv los rho tawm cov khoom tseem ceeb thiab cyanide los ntawm cov kua dej tsis zoo.

5. Txoj kev ua kua Membrane

• Hauv kev kho cov kua dej tsis zoo, cov roj - hauv - dej feem ntau yog siv. Lub hauv paus ntsiab lus yog: ua ntej, acidify cov cyanide-muaj cov dej khib nyiab los hloov cov cyanide ions hauv nws mus rau HCN. HCN dhau los ntawm cov roj - theem ua kua membrane mus rau hauv cov dej sab hauv thiab tom qab ntawd reacts nrog NaOH los tsim NaCN.

6.Electrodialysis Method

• Txoj kev no siv lub teb hluav taws xob los tsav kev tsiv teb tsaws ntawm ions los ntawm ion - pauv daim nyias nyias kom ua tiav cov kev sib cais thiab rov qab cov khoom.

Kev Tshawb Fawb Txog Kev Tshawb Fawb Txog Gold Mine's Cyanide-Poor Liquid

Keeb kwm ntawm kev sim

Cov kua cyanide-tsis zoo ntawm ib lub pob zeb kub muaj qhov tshwj xeeb siab tag nrho cov ntsiab lus cyanide, nce mus txog 13000mg / L. Xws li high- concentration cyanide - muaj cov dej khib nyiab ua rau muaj kev hem thawj rau ib puag ncig thiab xav tau kev kho mob zoo.

Txoj hauv kev sim

1.H₂O₂ + ClO₂ + C Adsorption Method

• Nyob rau hauv txoj kev no, hydrogen peroxide (H₂O₂) thiab chlorine dioxide (ClO₂) yog thawj zaug siv los ua oxidants los oxidize cov cyanide hauv cyanide - kua tsis zoo. Tom qab ntawd, activated carbon (C) adsorption yog nqa tawm kom tshem tawm cov pa phem ntxiv.

2.Peb - Theem Oxidation (H₂O₂ + Catalyst "M") + Chlorination Aeration + C Adsorption Method

• Kev Oxidation Peb Theem : Hydrogen peroxide (H₂O₂) thiab ib qho catalyst tshwj xeeb "M" yog siv rau kev oxidation peb theem. Qhov no yog los xyuas kom meej tias muaj kev oxidation ntau yam cyanide sib xyaw, suav nrog cov cyanides nyuaj.

• Kev Siv Chlorination Aeration : Tom qab peb theem oxidation, kev siv chlorination aeration raug ua tiav. Chlorine raug ntxiv rau hauv cov kua thaum lub sijhawm aerating, uas tuaj yeem oxidize ntxiv cov tshuaj cyanide uas tseem tshuav thiab qee yam tshuaj lom neeg uas txo tau.

• C Kev Nqus Tawm : Thaum kawg, cov pa roj carbon activated adsorption yog siv los nqus cov pa phem me me thiab cov tshuaj cyanide seem kom ua tiav lub hom phiaj ntawm kev ntxuav cov kua cyanide tsis zoo.

Kev sim cov txiaj ntsig thiab kev sib piv

1.H₂O₂ + ClO₂ + C Adsorption Method

• Txoj kev no tau ua tiav qee qhov kev tshem tawm cyanide, tab sis qhov kawg tag nrho cov ntsiab lus cyanide nyob rau hauv cov kua kho tseem muaj siab, ua tsis tau raws li cov qauv kev tawm hauv lub tebchaws nruj.

2.Peb - Theem Oxidation (H₂O₂ + Catalyst "M") + Chlorination Aeration + C Adsorption Method

• Txoj kev no tau pom cov txiaj ntsig zoo dua. Qhov kawg tag nrho cov ntsiab lus cyanide raug txo mus rau 0.44mg / L, uas ua tau raws li lub teb chaws tus qauv tso tawm. Tsis tas li ntawd, cov ntsiab lus ntawm lwm cov hlau hnyav kuj ua tau raws li cov qauv tsim nyog hauv lub tebchaws.

• Tus Nqi - Kev Ua Haujlwm Zoo : Hais txog tus nqi, txawm hais tias cov txheej txheem oxidation peb theem nrog cov catalyst thiab ntxiv chlorination aeration xav tau kev ua haujlwm nyuaj dua thiab siv qee cov catalysts thiab chlorine, feem ntau, piv rau qee lwm txoj kev nyuaj dhau lossis kim heev, tus nqi tsim nyog. Nws tuaj yeem kho cov kua cyanide uas muaj cov concentration siab thiab tsis zoo thaum tswj tus nqi hauv qhov ntau thiab tsawg.

xaus

Kev kho mob ntawm cyanide - kua dej tsis zoo hauv cov mines kub yog txoj haujlwm nyuaj tab sis tseem ceeb heev. Los ntawm kev sim kev tshawb fawb ntawm cyanide - cov kua dej tsis zoo ntawm qee cov mine kub, nws tuaj yeem pom tias cov kev kho mob sib txawv muaj lawv tus kheej qhov zoo thiab qhov tsis zoo. Qhov peb-theem oxidation (H₂O₂ + catalyst "M") + chlorination aeration + C adsorption txoj kev qhia tau hais tias muaj txiaj ntsig zoo rau kev kho mob thiab tus nqi - kev ua haujlwm zoo rau cov cyanide - cov kua dej tsis zoo nrog cov ntsiab lus cyanide siab hauv qhov kub no. Txawm li cas los xij, kev tshawb fawb txuas ntxiv thiab kev txhim kho tseem xav tau yav tom ntej txhawm rau txhim kho kom muaj txiaj ntsig zoo dua, raug nqi - zoo, thiab kev kho tus phooj ywg ib puag ncig kom ua tau raws li qhov yuav tsum tau ua ntawm kev tiv thaiv ib puag ncig thiab kev tsim kho kom ruaj khov hauv kev lag luam kub mining.