Direct Electrowinning Kub los ntawm Cyanide Solution

Introduction

Cyanidation tau ntev yog thawj txoj hauv kev rau rho tawm kub los ntawm ores. Tom qab lub cyanide leaching txheej txheem, cov kub yog tam sim no nyob rau hauv lub tshuaj cyanide, lub npe hu ua tus cev xeeb tub leach tov. Kev lig kev cai, txoj kev zoo li carbon adsorption (xws li Carbon-in-Kumn - CIC txheej txheem) thiab zinc cementation (Merrill Crowe txheej txheem) tau siv los rov qab kub los ntawm cov tshuaj no. Txawm li cas los xij, ncaj qha electrowinning los ntawm cov kev daws teeb meem cyanide tau tshwm sim los ua ib qho kev cog lus, muab ntau qhov zoo ntawm kev ua tau zoo, nqi, thiab kev cuam tshuam ib puag ncig.

Txoj Cai ntawm Direct Electrowinning

Direct electrowinning yog txheej txheem electrochemical. Hauv cov ntsiab lus ntawm kub rho tawm los ntawm kev daws teeb meem cyanide, thaum hluav taws xob tam sim no dhau los ntawm cov tshuaj cyanide uas muaj kub hauv daim ntawv ntawm aurocyanide complexes (Au(CN)_2^-), cov kev tshwm sim hauv qab no tshwm sim ntawm cov electrodes:

• Hauv cathode: Au(CN)_2^- + e^- \rightarrow Au + 2CN^-

Kub ions nyob rau hauv lub aurocyanide complex tau txais ib qho hluav taws xob thiab muab tso rau hauv cov hlau kub ntawm lub cathode nto.

• Hauv qhov anode: Nyob ntawm cov xwm txheej, dej oxidation lossis oxidation ntawm lwm hom hauv cov tshuaj yuav tshwm sim. Piv txwv li, 2H_2O \rightarrow O_2 + 4H^+ + 4e^-

Qhov zoo ntawm Direct Electrowinning

1. simplicity: Muab piv rau ntau cov txheej txheem xws li carbon adsorption ua raws li elution thiab electrowinning (nyob rau hauv rooj plaub ntawm CIC), ncaj qha electrowinning txo tus naj npawb ntawm chav ua haujlwm. Qhov no simplifies tag nrho cov txheej txheem ntws, ua kom yooj yim rau kev khiav lag luam thiab tswj.

2. Nqi - kev ua tau zoo: Nrog cov txheej txheem tsawg dua, muaj peev xwm txo qis peev thiab cov nqi khiav lag luam. Tsis tas yuav tsum nqis peev rau hauv cov chaw tsim kho cov pa roj carbon ntau (xws li hauv CIC) lossis yuav cov hmoov zinc ntau ntau (xws li hauv Merrill Crowe txheej txheem).

3. High Purity Khoom: Qhov ncaj qha electrodeposition ntawm kub tuaj yeem ua rau lub siab-purity kub tso rau ntawm cathode. Qhov no tuaj yeem txo qhov kev xav tau ntawm cov txheej txheem kho kom zoo nkauj hauv qab, txuag nqi ntxiv.

4. Environmental Benefits: Los ntawm kev tshem tawm kev siv zinc hauv cov txheej txheem Merrill Crowe, muaj tsawg tiam ntawm zinc - muaj cov khoom pov tseg. Tsis tas li ntawd, qhov yooj yim ntawm cov txheej txheem tuaj yeem ua rau txo qis kev siv tshuaj lom neeg tag nrho thiab tsim khoom pov tseg.

Txheej txheem kev txiav txim siab

1. Kev daws Concentration: Qhov concentration ntawm kub hauv cov tshuaj cyanide yog ib qho tseem ceeb heev. Txawm hais tias ncaj qha electrowinning tuaj yeem siv rau cov kev daws teeb meem nrog ntau yam ntawm cov kub kub, qhov siab dua feem ntau ua rau cov nqi tso tawm sai dua. Txawm li cas los xij, cov kub kub siab heev yuav xav tau cov qauv electrode tshwj xeeb kom ntseeg tau tias kev tso nyiaj tsis sib xws.

2. Cov khoom siv hluav taws xob: Kev xaiv cov khoom siv electrode yog qhov tseem ceeb. Stainless - steel wool feem ntau yog siv los ua cov khoom siv cathode rau nws qhov chaw siab, uas tso cai rau kom muaj txiaj ntsig kub. Rau cov anode, cov ntaub ntawv uas tiv taus corrosion hauv cov tshuaj cyanide, xws li dimensionally ruaj khov anodes (DSA), nyiam dua.

3. pH thiab kub: Cov pH ntawm cov tshuaj cyanide yuav tsum tau ua tib zoo tswj. Ib qho me ntsis alkaline pH feem ntau yog tswj hwm los tiv thaiv kev decomposition ntawm cyanide. Qhov kub ntawm cov tshuaj kuj tuaj yeem cuam tshuam rau tus nqi ntawm electrowinning, nrog rau qhov kub siab dua feem ntau nce cov tshuaj tiv thaiv tab sis kuj ua rau muaj kev pheej hmoo ntawm cyanide decomposition.

Txheej Txheem

1. Kev npaj daws teeb meem: Lub cev xeeb tub cyanide leach tov los ntawm heap leaching lossis lwm yam txheej txheem cyanidation yog thawj zaug rau kev kho mob ua ntej. Qhov no yuav cuam tshuam nrog kev pom kom tshem tawm cov khib nyiab, vim tias cov no tuaj yeem cuam tshuam nrog cov txheej txheem electrowinning thiab ua rau luv luv ntawm cov electrodes.

2. Electrowinning Cell: Cov tshuaj kho ua ntej yog tom qab ntawd nkag mus rau hauv lub tshuab hluav taws xob electrowinning. Lub cell yog nruab nrog anode thiab cathode. Raws li kev siv hluav taws xob tam sim no, kub pib tso rau ntawm cathode.

3. Kub rov qab: Thaum muaj nyiaj txaus ntawm cov kub tau tso rau ntawm cathode, lub cathode raug tshem tawm ntawm lub xov tooj ntawm tes. Cov kub tuaj yeem raug stripped los ntawm cathode xws li mechanically lossis chemically, nyob ntawm seb qhov xwm txheej ntawm cov khoom siv cathode. Lub stripped kub yog ces ntxiv refined kom tau high-purity kub.

Cov nqi sib tw thiab yav tom ntej Outlook

1. Cyanide Management: Txawm hais tias ncaj qha electrowinning muaj qhov zoo, kev siv cyanide nyob rau hauv tag nrho cov txheej txheem rho tawm kub tseem ua rau muaj kev pheej hmoo ntawm ib puag ncig thiab kev nyab xeeb. Kev tshawb fawb yav tom ntej yuav tsom mus rau kev sib koom ua ke ncaj qha electrowinning nrog lwm txoj hauv kev, tsis muaj tshuaj lom leaching txoj kev.

2. Kev Siv Hluav Taws Xob: Cov txheej txheem electrowinning yuav tsum muaj hluav taws xob loj. Tsim kom muaj zog ntau dua - cov khoom siv hluav taws xob muaj txiaj ntsig zoo thiab cov qauv tsim ntawm tes yog ib qho ntawm cov kev tshawb fawb nquag.

3. Scalability: Raws li nrog rau cov cuab yeej tawm tshiab, scaling up direct electrowinning from laboratory - scale to industrial - scale operations yuav tsum tau ua tib zoo optimized kom zoo ib yam li kev ua tau zoo thiab cov nqi - efficiency.

Direct electrowinning ntawm kub los ntawm cyanide cov kev daws teeb meem sawv cev rau ib tug tseem ceeb technological kev nce qib nyob rau hauv lub kub mining kev lag luam. Nrog rau kev tshawb nrhiav thiab kev txhim kho ntxiv los daws cov teeb meem uas twb muaj lawm, nws muaj peev xwm los ua txoj hauv kev tseem ceeb rau kub rov qab nyob ze tom ntej.