Lub hauv paus ntsiab lus ntawm Sodium Cyanide hauv Carbon-in-Pulp Txheej Txheem rau Kub Extraction

Introduction

Cov txheej txheem Carbon -in-pulp (CIP) yog ib txoj kev siv dav hauv kev lag luam kub rau kev rho tawm kub ntawm cov hlau. Sodium cyanide ua lub luag haujlwm tseem ceeb hauv cov txheej txheem no. Tsab xov xwm no nkag mus rau hauv cov ntsiab lus ntxaws ntxaws ntawm Sodium cyanide ua haujlwm li cas hauv cov txheej txheem CIP rau kev rho tawm kub.

Cyanidation Reaction: Lub Foundation ntawm Kub Dissolution

1. Tshuaj Reaction Mechanism

Sodium cyanide (NaCN) yog cov tshuaj tiv thaiv zoo heev. Thaum raug oxygen, nws reacts nrog kub tam sim no nyob rau hauv lub ore. Cov tshuaj tiv thaiv hloov cov kub insoluble nyob rau hauv cov ore mus rau hauv ib daim ntawv soluble los ntawm tsim ib tug ruaj khov complex nrog cov kub. Cov kauj ruam complexation no yog qhov tseem ceeb vim nws tso cai rau cov kub sib cais los ntawm cov khoom ntawm cov ore.

2. Lub luag haujlwm ntawm Oxygen

Cov pa oxygen yog ib qho tseem ceeb hauv cov tshuaj Cyanidation , ua haujlwm ua tus neeg sawv cev oxidizing los pab rhuav tshem kub. Yog tsis muaj oxygen, cov tshuaj tiv thaiv ntawm kub thiab cyanide ions yuav ua mus sai heev. Cov pa oxygen muab cov xwm txheej tsim nyog rau cov kub-cyanide complex los tsim. Hauv kev siv hauv kev lag luam, huab cua feem ntau raug ua npuas los ntawm cov tshuaj cyanide kom ntseeg tau tias muaj cov pa oxygen txaus. Qhov ntau ntawm cov pa oxygen hauv cov tshuaj cuam tshuam ncaj qha rau qhov ceev uas kub yaj.

3. pH tswj

Qib pH ntawm cov tshuaj cyanide yog qhov tseem ceeb hauv cov txheej txheem cyanidation. Sodium cyanide, ua ntsev ntawm cov kua qaub tsis muaj zog thiab lub hauv paus muaj zog, tuaj yeem nkag mus rau hydrolysis hauv dej, muaj peev xwm tsim cov hydrogen cyanide, cov pa phem heev thiab tsis muaj zog. Txhawm rau tiv thaiv qhov no, cov tshuaj pH yog ua tib zoo khaws cia nyob rau theem siab, feem ntau yog nyob ib ncig ntawm 10 - 11. Qhov pH siab no tsis tsuas yog stabilizes cov tshuaj cyanide nkaus xwb tab sis kuj ua kom cov txiaj ntsig zoo ntawm cov kub dissolution. Tsis tas li ntawd, nws yuav pab txo qis kev cuam tshuam los ntawm lwm cov hlau ions hauv cov ore uas tuaj yeem hnov ​​​​mob nrog cyanide ions thiab cuam tshuam cov txheej txheem kub rho tawm.

Adsorption ntawm Kub Cyanide Complexes los ntawm Activated Carbon

1. Selective Adsorption Property of Activated Carbon

Thaum kub yaj nyob rau hauv cov tshuaj cyanide raws li complexes, activated carbon yog nkag mus rau hauv lub pulp. Cov pa roj carbon activated muaj thaj tsam loj thiab cov qauv ntxeem tau, uas tso cai rau nws xaiv nyiam thiab tuav mus rau cov kub cyanide complexes. Cov micropores thiab mesopores hauv cov pa roj carbon activated muab ntau qhov chaw rau adsorption. Cov kub cyanide complexes tau kos rau cov chaw no los ntawm ntau lub zog, suav nrog van der Waals rog thiab electrostatic cuam tshuam.

2. Mechanism ntawm Adsorption

Cov txheej txheem adsorption ntawm kub cyanide complexes los ntawm activated carbon tshwm sim nyob rau hauv ntau kauj ruam. Ua ntej, cov complexes nyob rau hauv cov tshuaj txav mus rau saum npoo ntawm activated carbon vim qhov sib txawv ntawm lawv cov concentration ntawm cov tshuaj thiab cov pa roj carbon nto. Thaum nyob ntawm qhov chaw, cov complexes txuas mus rau qhov chaw muaj. Ib qho kev sib npaug tau mus txog thaum tus nqi ntawm cov complexes raug adsorbed sib npaug ntawm tus nqi uas lawv raug tso tawm. Lub siab affinity ntawm activated carbon rau kub cyanide complexes enables npaum kev sib cais ntawm kub los ntawm kev daws, tsom rau nws rau cov kauj ruam tom ntej.

Desorption thiab rov qab kub los ntawm Activated Carbon

1. Cov txheej txheem desorption

Tom qab cov pa roj carbon uas tau ua kom kub nqus tau cov kub cyanide complexes thiab tau muab kub ntim rau hauv, cov kub yuav tsum tau muab tshem tawm ntawm cov pa roj carbon kom ua tiav ntxiv. Ib txoj hauv kev uas siv ntau yog Zadra process. Hauv txoj kev no, cov pa roj carbon uas tau ntim lawm raug kho nrog cov tshuaj kub ntawm Sodium Cyanide thiab sodium hydroxide. Qhov kub thiab cov tshuaj lom neeg ntawm cov tshuaj ua rau cov kev sib txuas ntawm cov kub thiab cov pa roj carbon uas tau ua kom kub raug tso tawm rov qab rau hauv cov tshuaj.

2. Kub rov qab los ntawm Desorbed tshuaj

Thaum cov kub rov qab los rau hauv kev daws teeb meem, ob peb lub tswv yim tuaj yeem siv los rov qab los. Ib txoj hauv kev nrov yog electroplating, qhov twg cov hluav taws xob tam sim no tau dhau los ntawm kev daws teeb meem rau kev tso nyiaj hlau kub rau hauv cathode. Lwm txoj kev yog zinc nag lossis daus. Zinc hmoov yog ntxiv rau cov tshuaj, thiab los ntawm cov tshuaj tiv thaiv redox, zinc tshem cov kub los ntawm cov kub cyanide complex, tso cai rau lub precipitated kub cais los ntawm cov tshuaj siv pom los yog lwm yam kev sib cais.

xaus

Sodium cyanide yog ib feem tseem ceeb ntawm cov txheej txheem carbon-in-pulp rau kev rho tawm kub. Nws ua rau cov kub yaj los ntawm cov hlau los ntawm kev tsim cov khoom ruaj khov nyob rau hauv qhov muaj oxygen thiab nyob rau hauv cov xwm txheej pH tswj tau. Cov kauj ruam tom ntej ntawm kev nqus los ntawm cov pa roj carbon activated, desorption los ntawm cov pa roj carbon, thiab rov qab tau kub txhua yam yog ua raws li qhov kev tshuaj tiv thaiv thawj zaug uas muaj sodium cyanide . Kev nkag siab txog cov ntsiab cai no yog qhov tseem ceeb rau kev ua kom zoo dua thiab ua tau zoo ntawm cov txheej txheem rho tawm kub hauv kev lag luam mining, thaum tseem ua kom muaj kev nyab xeeb thiab kev tswj hwm ib puag ncig vim yog qhov xwm txheej lom ntawm sodium cyanide.