Lub luag haujlwm ntawm Hydrogen Peroxide hauv Sodium Cyanide Leaching Processes

Introduction

Nyob rau hauv lub tshav pob ntawm kub extraction thiab lwm yam hlau - cov txheej txheem rov qab, cyanide leaching, tshwj xeeb nrog sodium cyanide, tau yog ib txoj kev siv dav rau ntau tshaj ib puas xyoo. Cov txheej txheem no, uas tsim cov hlau soluble - cyanide complexes, ua tau zoo tab sis ntsib ntau yam kev cov nyom. Ib qho teeb meem loj yog qhov ua rau qeeb qeeb thiab qhov yuav tsum tau muaj cov pa oxygen txaus kom yaj cov hlau zoo li kub. Qhov no yog qhov twg hydrogen peroxide (H₂O₂) tau tshwm sim los ua ib qho kev cog lus ntxiv los txhim kho cov txheej txheem cyanide leaching.

Lub hauv paus ntawm Cyanide Leaching

Cyanide leaching ua haujlwm vim cyanide ions tuaj yeem ua rau cov hlau ua kom ruaj khov thiab soluble complexes. Thaum nws los txog rau rho tawm kub, oxygen plays lub luag haujlwm tseem ceeb ua tus neeg sawv cev oxidizing. Nws pab hloov kub rau hauv ib daim ntawv uas tuaj yeem ua ke nrog cyanide ions, uas ua rau muaj kev sib xyaw ua ke uas tuaj yeem ua tiav ntxiv kom tau txais kub. Txawm li cas los xij, hauv ntau cov ores, cov pa oxygen uas muaj los ntawm huab cua feem ntau tsis txaus. Qhov tsis txaus no ua rau muaj kev cuam tshuam qeeb thiab tsis tiav cov hlau rho tawm.

Yuav ua li cas Hydrogen Peroxide pab hauv Cyanide Leaching

1. Oxygen Supply

Hydrogen peroxide yog lub zog oxidizing tus neeg sawv cev. Thaum ntxiv rau cov tshuaj cyanide leaching, nws tawg thiab tso tawm oxygen. Cov pa oxygen ntxiv no txhawb nqa cov oxidation ntawm cov hlau thaum lub sij hawm leaching txheej txheem. Hauv ores uas muaj sulfide minerals, piv txwv li, oxidation ntawm cov sulfides los ntawm oxygen yog qhov tseem ceeb rau kev tso cov kub hauv. Cov pa oxygen tso tawm los ntawm hydrogen peroxide tuaj yeem ua kom cov kauj ruam oxidation no, ua kom yooj yim rau cov cyanide kom hnov ​​​​mob nrog kub tom qab.

2. Accelerating tus Leaching Rate

Cov kev tshawb fawb tau pom tias hydrogen peroxide tuaj yeem ua rau tag nrho ceev ntawm cov txheej txheem cyanide leaching. Nws tsis tsuas yog muab cov pa oxygen ntxiv xwb; nws kuj koom nrog cov tshuaj lom neeg cov tshuaj tiv thaiv uas ua rau cov txheej txheem tiv thaiv nyob rau saum npoo ntawm ore hais. Qee zaum, hlau sulfides los yog lwm yam minerals tsim ib txheej ntawm kub - bearing hais, uas txwv tsis pub cyanide mus txog kub. Hydrogen peroxide tuaj yeem hnov ​​​​mob nrog cov khaubncaws sab nraud povtseg, los ntawm oxidizing lawv lossis los ntawm lub cev sib cais los ntawm kev ua ntawm cov dawb radicals uas tsim thaum lub sij hawm decomposition. Qhov no tso cai rau cyanide ions nkag mus rau cov kub tau yooj yim dua, yog li nce tus nqi ntawm cov kub yaj.

3. Txo kev siv Cyanide

Nyob rau hauv cov tsoos cyanide leaching, ib tug loj npaum li cas ntawm cyanide yog siv tsis tau tsuas yog nyob rau hauv cov tshuaj tiv thaiv nrog kub, tab sis kuj nyob rau hauv sab tshua nrog rau lwm yam hlau ions tam sim no nyob rau hauv lub ore, xws li tooj liab, zinc, thiab hlau. Cov tshuaj tiv thaiv sab no txo ​​qhov ua tau zoo ntawm cov kub - cov tshuaj tiv thaiv cyanide thiab ua rau kom tus nqi tag nrho ntawm cov txheej txheem leaching. Hydrogen peroxide tuaj yeem pab txo qis kev siv cyanide hauv ob txoj hauv kev. Ua ntej, los ntawm kev txhim kho cov oxidation ntawm kub, nws txhawb kev tsim ntawm cov kub - cyanide complex sai dua, tawm tsawg lub sij hawm rau cyanide react nrog lwm yam hlau. Thib ob, hydrogen peroxide tuaj yeem hloov daim ntawv ntawm qee qhov cuam tshuam cov hlau ions kom lawv hnov ​​​​mob tsawg dua nrog cyanide. Piv txwv li, nws tuaj yeem hloov ferrous ions mus rau ferric ions. Ferric ions tsim cov complexes tsis tshua muaj zog nrog cyanide, txo tus nqi ntawm cyanide nkim nyob rau hauv unproductive side reactions.

Case Studies thiab Experimental Evidence

Ntau qhov kev sim thiab kev sim ua lag luam tau ua pov thawj qhov ua tau zoo ntawm hydrogen peroxide hauv cyanide leaching. Nyob rau hauv ib txoj kev kawm ntawm ib qho nyuaj - mus - txheej txheem kub ore, ntxiv hydrogen peroxide rau cov cyanide leaching tov tau nce tus kub leaching tus nqi los ntawm 20 - 30% piv rau tsoos cyanide leaching nrog tsuas yog cua aeration. Lub sij hawm leaching kuj raug txo qis heev, los ntawm ob peb hnub mus rau ob peb teev xwb.

Hauv kev lag luam - ntsuas kub mine daim ntawv thov, siv hydrogen peroxide nyob rau hauv cov txheej txheem cyanide leaching coj mus rau 15% txo. siv cyanide thaum tseem tuav lub siab kub rov qab. Qhov no tsis tsuas yog txo qis cov nqi khiav lag luam ntsig txog kev yuav cyanide tab sis kuj txo cov kev pheej hmoo ib puag ncig cuam tshuam nrog kev siv cyanide thiab pov tseg.

Kev txiav txim siab rau kev siv Hydrogen Peroxide

1. Kev xav

Qhov zoo tshaj plaws ntawm hydrogen peroxide ntxiv rau cov tshuaj cyanide leaching yog nyob ntawm ntau yam, nrog rau hom ore, qhov concentration ntawm cyanide twb nyob rau hauv cov tshuaj, thiab muaj lwm yam minerals. Feem ntau, cov concentration ntawm 0.1 - 1% (los ntawm ntim) tau pom tias ua haujlwm tau zoo nyob rau ntau qhov xwm txheej. Tab sis yog tias qhov concentration siab dhau lawm, nws tuaj yeem ua rau dhau - oxidation ntawm cov hlau, suav nrog kub. Qhov no dhau lawm - oxidation yuav tsim tsawg soluble kub tebchaw thiab txo tus nqi ntawm cov kub uas yuav rov qab tau.

2. pH tswj

Qhov pH ntawm cov tshuaj leaching yog ib qho tseem ceeb heev thaum siv hydrogen peroxide. Cyanide leaching feem ntau tshwm sim ntawm pH siab (ib ncig 9 - 12) los tiv thaiv kev tsim cov pa roj hydrogen cyanide. Hydrogen peroxide yog qhov ruaj khov ntawm pH siab dua. Txawm li cas los xij, yog tias pH siab heev, nws tuaj yeem txo qhov ua tau zoo ntawm hydrogen peroxide ua tus neeg sawv cev oxidizing. Yog li, yuav tsum tau ceev faj tswj cov pH kom paub meej tias ob qho tib si cyanide thiab hydrogen peroxide ua haujlwm zoo hauv cov txheej txheem leaching.

3. Kev Nyab Xeeb

Hydrogen peroxide yog tus neeg sawv cev oxidizing muaj zog thiab tuaj yeem ua rau muaj kev phom sij yog tias tsis kho kom raug. Nws tuaj yeem ua rau tawv nqaij thiab qhov muag, thiab hauv cov ntaub ntawv muaj zog, nws tuaj yeem ua rau tawg. Thaum siv hydrogen peroxide hauv cyanide leaching, kev ntsuas kev nyab xeeb yuav tsum tau ua. Qhov no suav nrog kev siv cov cuab yeej tiv thaiv tus kheej, khaws cia thiab tuav cov tshuaj kom raug.

xaus

Hydrogen peroxide tau pom tias muaj peev xwm ua tau zoo li cov khoom ntxiv hauv Sodium Cyanide cov txheej txheem leaching. Los ntawm kev muab cov pa oxygen ntxiv, ua kom ceev cov leaching tus nqi, thiab txo cov cyanide noj, nws tuaj yeem txhim kho kev ua haujlwm thiab kev lag luam ntawm cov hlau rho tawm, tshwj xeeb tshaj yog rau kub. Txawm li cas los xij, zoo li cov txheej txheem tshuaj lom neeg, kev ua kom zoo thiab ua raws li cov txheej txheem kev nyab xeeb yog qhov tseem ceeb rau nws txoj kev ua tiav. Raws li kev lag luam mining tseem tab tom nrhiav kom muaj txiaj ntsig zoo thiab muaj txiaj ntsig zoo, kev siv hydrogen peroxide hauv cyanide leaching yog qhov tseem ceeb dua yav tom ntej.