Kawm txog Cyanide Leaching ntawm Carbonaceous Carlin-Hom Kub Ore

Introduction

Cov pob zeb kub hom Carbonaceous Carlin yog cov yam ntxwv los ntawm lawv qhov kev faib tawm dav dav thiab cov khoom muaj ntau. Txawm li cas los xij, lawv ua rau muaj kev cov nyom loj hauv cov txheej txheem rho tawm kub. Cov pob zeb no feem ntau muaj Carbon hauv lawv cov khoom sib xyaw, thiab cov khoom kub muaj nyob rau hauv daim ntawv zoo sib kis. Qhov muaj arsenic thiab carbon ua rau muaj ob qho teeb meem loj: kub encapsulation thiab carbon qhov kub-robbery nyhuv, ua rau muaj qhov qis qis heev ncaj qha cyanidation leaching nqi. Yog li ntawd, lawv raug suav hais tias yog ob chav refractory ores lossis stubborn ores, sawv cev rau lub ntiaj teb lees paub hauv kev tshawb nrhiav kub.

Qhov teeb meem ntawm Cyanide Leaching hauv Carbonaceous Carlin-Hom Kub Ores

Kub Encapsulation

Cov zaub mov sulfide hauv cov pob zeb kub Carlin uas muaj carbonaceous feem ntau npog cov khoom kub. Qhov kev thaiv lub cev no tiv thaiv kev sib cuag ncaj qha ntawm cov kua cyanide thiab kub, ua rau txo qis kev ua haujlwm ntawm cov txheej txheem leaching. Piv txwv li, hauv ntau lub qhov tsua uas muaj cov pob zeb zoo li no, feem ntau ntawm cov kub tseem raug kaw hauv cov sulfide matrix, tsis tuaj yeem nkag mus rau tus neeg sawv cev Cyanide leaching.

Carbon's Gold-robbery Effect

Cov khoom siv carbonaceous hauv cov ores no muaj kev sib raug zoo rau cov kub cyanide complexes. Thaum lub sijhawm cyanide leaching txheej txheem, thaum kub yaj thiab tsim cov cyanide complexes, cov khoom carbonaceous tuaj yeem nqus cov complexes no, ua tau zoo "robbing" kub ntawm cov kua. Qhov no tsis yog tsuas yog ua rau tus nqi rov qab ntawm kub qis dua tab sis kuj ua rau muaj kev poob loj hauv cov txheej txheem rho tawm. Kev tshawb fawb tau qhia tias ntau hom carbon hauv cov ore, xws li elemental carbon, organic carbon, thiab inorganic carbon, txhua tus pab txhawb rau ntau qib rau qhov kub-robbery effect. Elemental carbon, tshwj xeeb, muaj tus cwj pwm adsorption zoo ib yam li Activated Carbon , uas tuaj yeem nqus cov kub cyanide complexes.

Kev tshawb fawb txog Cyanide Leaching Experiments

Direct Cyanide Leaching

Ntau cov kev tshawb fawb tau pom tias ncaj qha cyanide leaching ntawm carbonaceous Carlin-hom kub ore yields kub heev rov qab. Qee zaum, txawm tias thaum siv cov txheej txheem cyanide leaching siab xws li carbon-in-pulp (CIP) lossis resin-in-pulp (RIP), tus nqi rov qab tseem poob qis. Piv txwv li, nyob rau hauv ib qho kev sim, qhov kub rov qab tus nqi ntawm ncaj qha cyanide leaching tsuas yog 12.9%, qhia txog qhov tsis muaj txiaj ntsig ntawm txoj hauv kev no rau cov refractory ores.

Pretreatment Methods los txhim kho Cyanide Leaching

Ci

Roasting yog ib txoj kev ua ntej ua ntej. Los ntawm cua sov cov ore, cov ntaub ntawv carbonaceous raug tshem tawm raws li CO thiab CO₂, thiab pyrite decomposes rau hauv hlau oxides. Cov txheej txheem no nthuav tawm cov kub uas dhau los ua ke, ua rau nws yooj yim dua rau cyanide leaching. Txawm li cas los xij, roasting yuav tsum tau noj zoo ntawm qhov rho tawm kaum mesh, tsawg kawg yog plaub teev ntawm lub sijhawm khaws cia, thiab tswj qhov kub thiab txias hauv qhov cub. Kub hauv qab li 500 ° C los yog ib qho me ntsis txo qhov cua tuaj yeem ua rau tsis tiav roasting, ua rau txo qis hauv kub rho tawm. Ntxiv mus, ntawm 550 ° C thiab siab dua, pyrite tau hloov mus rau hauv daim ntawv refractory ntawm hematite los ntawm qhov kub tsis tuaj yeem ua tau zoo leached nrog cyanide. Tsis tas li ntawd, roasting yuav tsum tau them nqi kom qhuav ntawm cov khoom noj rau lub cub tawg thiab nruj emission tswj ntawm lub cub tawg gases. Txawm hais tias nws tuaj yeem ua tiav kub rho tawm ntawm 85 - 87% los ntawm cov ores uas muaj kaum peb grams ntawm kub ib tonne, vim nws cov peev txheej siab thiab kev ua haujlwm nyuaj, roasting tau raug tso tseg raws li qhov tsim nyog rau ntau carbonaceous Carlin-hom kub ore deposits.

Tshuaj Oxidation

Tshuaj oxidation tau pom tias muaj peev xwm kho tau carbonaceous Carlin-hom kub ore. Oxidizing cov neeg ua haujlwm nyob rau hauv aqueous pulps tuaj yeem kov yeej cov teebmeem ntawm cov khoom carbonaceous. Piv txwv li, kev siv cov tshuaj chlorine ua tus neeg saib xyuas ua ntej tau kawm ntau heev. Txawm li cas los xij, tus nqi ntawm chlorine yuav tsum tau sib txawv nyob ntawm seb qhov refractory ntawm cov ore. Cov ore refractory me me yuav xav tau tsuas yog kaum mus rau nees nkaum kg ntawm chlorine ib tonne hauv cyanidation pretreatment kom ua tiav 83% lossis ntau dua kub rho tawm hauv cyanidation tom ntej. Cov ore refractory siab heev, ntawm qhov tod tes, yuav xav tau ntau tshaj 100 kg ntawm chlorine ib tonne nyob rau hauv cov txheej txheem pretreatment. Lwm cov tshuaj oxidizing xws li hydrogen peroxide, sodium hypochlorite, thiab potassium permanganate kuj tau tshawb xyuas. Sodium hypochlorite, piv txwv li, tuaj yeem tsis tsuas yog oxidize sulfide minerals kom nthuav tawm cov kub encapsulated tab sis kuj passivate cov ntaub ntawv carbonaceous, txo lawv cov kub-tub sab nyhuv. Kev tshawb fawb tau pom tias qee qhov xwm txheej, siv sodium hypochlorite ua tus neeg saib xyuas ua ntej tuaj yeem txhim kho cov nyiaj rov qab zoo dua hauv cov cyanide leaching tom ntej.

Cov kab mob Oxidation

Cov kab mob oxidation yog ib txoj kev tawm tshiab thiab ib puag ncig tus phooj ywg pretreatment. Cov kab mob sib xyaw acidophilic tuaj yeem siv los oxidize sulfide minerals hauv cov ore. Cov txheej txheem no zoo daws qhov teeb meem ntawm kub encapsulation los ntawm sulfides. Thaum cov kab mob oxidation, cov kab mob metabolize sulfide minerals, rhuav tshem lawv thiab tso cov kub encapsulated. Nyob rau tib lub sijhawm, kev siv cov pa roj carbon activated hauv cov txheej txheem cyanide leaching tom ntej tuaj yeem ua kom zoo dua ntawm nws qhov kev sib tw adsorption muaj peev xwm los tiv thaiv cov kub tub sab ntawm cov tshuaj carbonaceous. Piv txwv li, nyob rau hauv ib txoj kev tshawb no ntawm carbonaceous Carlin-hom kub deposit nyob rau hauv Yunnan, los ntawm kev sib xyaw ntawm cov kab mob oxidation thiab carbon-in-pulp cyanidation, cov kub rov qab mus txog 82.39%, thaum lub cyanide reagent noj yog txo los ntawm 49.68%. Qhov no qhia tau hais tias cov kab mob oxidation - carbon cyanide leaching txheej txheem yog ib txoj kev zoo rau kev kho carbonaceous Carlin-hom kub ore.

xaus

Carbonaceous Carlin-type kub ores tam sim no muaj teeb meem loj hauv cov txheej txheem cyanide leaching vim kub encapsulation thiab carbon cov kub-tub sab nyhuv. Thaum cov cyanide leaching ncaj qha feem ntau tsis muaj txiaj ntsig, ntau txoj hauv kev ua ntej xws li roasting, tshuaj oxidation, thiab cov kab mob oxidation muaj peev xwm daws tau. Txhua txoj kev muaj nws tus kheej zoo thiab cov kev txwv nyob rau hauv cov nqe lus ntawm kub rov qab, tus nqi, thiab ib puag ncig cuam tshuam. Ntawm lawv, cov kab mob oxidation - carbon cyanide leaching thiab tej yam tshuaj oxidation txoj kev qhia tau hais tias zoo cog lus rau zoo kho cov refractory ores. Txawm li cas los xij, kev tshawb fawb ntxiv tseem yuav tsum tau ua kom zoo dua cov txheej txheem no, txo cov nqi, thiab txhim kho lawv cov phooj ywg ib puag ncig, txhawm rau ua kom cov extraction kub los ntawm carbonaceous Carlin-hom kub ores zoo dua thiab ruaj khov.