Kev tshawb fawb txog Heap Leaching ntawm Qib qis thiab High-Clay Oxidized Gold Ore

1. Introduction

Hauv kev lag luam kub mining, kev siv cov khoom siv qis thiab cov av nplaum oxidized kub tau dhau los ua ib qho tseem ceeb ntxiv vim tias cov khoom siv kub qib high-qib depletion. Cov hom ores no yog yam ntxwv los ntawm cov ntsiab lus kub tsawg thiab cov av nplaum ntxhia hauv cov ntsiab lus siab, uas ua rau muaj teeb meem loj rau cov kev siv nyiaj ib txwm muaj. Heap leaching tau tshwm sim raws li tus nqi-zoo thiab cov tswv yim mus kom ze rau kev kho cov ores, ua rau kom rho tawm cov kub los ntawm cov ntim loj ntawm cov khoom qis. Kab lus no nthuav tawm ib qho kev kawm dav dav ntawm lub heap leaching ntawm qis-qib thiab high-av oxidized kub ore, aiming mus optimize cov txheej txheem leaching thiab txhim kho kub rov qab nqi.

2. Cov yam ntxwv ntawm qib qis thiab High-Clay Oxidized Gold Ore

Qib qis oxidized kub ores feem ntau muaj qib kub qis dua 2 g / t, ua rau lawv cov kev lag luam extraction nyuaj dua. Cov ntsiab lus av nplaum siab nyob rau hauv cov ores tuaj yeem ua rau muaj teeb meem xws li tsis zoo permeability, agglomeration, thiab kev noj ntau ntawm leaching reagents. Av nplaum minerals, xws li kaolinite, montmorillonite, thiab illite, tuaj yeem adsorb kub ions thiab cuam tshuam nrog cov txheej txheem leaching. Tsis tas li ntawd, txoj kev nplua me me ntawm cov minerals me me tuaj yeem ua rau muaj cov txheej txheem ntom ntom ntom ntom ntom nti thiab muab cov khoom siv kub ua kom tau txais.

3. Kev sim txheej txheem

3.1 Ore Sampling thiab Characterization

Ib qho piv txwv ntawm cov qib qis thiab cov av nplaum oxidized kub ore tau sau los ntawm qhov chaw mining. Cov qauv ore tau soj ntsuam rau nws cov tshuaj muaj pes tsawg leeg, mineralogy, thiab lub cev muaj zog. X-ray fluorescence (XRF) tau siv los txiav txim qhov muaj pes tsawg leeg, thaum X-ray diffraction (XRD) tau ua haujlwm los txheeb xyuas cov theem ntxhia. Particle loj tsom xam tau ua los ntawm kev siv lub sieve shaker kom nkag siab txog qhov loj me ntawm cov ore hais.

3.2 Kem Leaching Experiments

Kem leaching thwmsim tau ua los simulate cov txheej txheem heap leaching. Cov qauv ore raug crushed thiab soj ntsuam rau qhov sib txawv particle loj. Cov kab nrog ib txoj kab uas hla ntawm 10 cm thiab qhov siab ntawm 100 cm tau sau nrog cov qauv ore. Ib qho kev sim tau tsim los tshawb xyuas qhov cuam tshuam ntawm ntau yam, suav nrog ore particle loj, calcium oxide (CaO) ntau npaum li cas, Sodium Cyanide (NaCN) concentration nyob rau hauv leaching tov, thiab leaching lub sij hawm, nyob rau hauv lub kub leaching tus nqi.

3.3 Optimization ntawm txheej txheem Parameters

Cov txheej txheem tsis tau optimized los ntawm ib tug series ntawm ib qho kev sim. Cov ore particle loj tau txawv ntawm -20 hli mus rau -5 hli, thiab CaO ntau npaum li cas tau hloov kho los ntawm 1% mus rau 5% ntawm cov ore loj. NaCN concentration nyob rau hauv cov tshuaj leaching tau hloov los ntawm 0.05% mus rau 0.2%, thiab lub sij hawm leaching tau ncua ntawm 10 hnub mus rau 30 hnub. Qhov kub leaching tus nqi tau saib xyuas nyob rau ib ntus los ntawm kev tshuaj xyuas cov ntsiab lus kub hauv cov leachate siv atomic absorption spectrometry (AAS).

4. Ntsiab Lus thiab Kev Sib Tham

4.1 Cov nyhuv ntawm Ore Particle Loj

Cov txiaj ntsig tau pom tias txo cov ore particle loj loj tuaj yeem txhim kho qhov kub leaching tus nqi. Thaum cov ore particle loj yog -5 hli, qhov kub leaching tus nqi mus txog 85% tom qab 20 hnub ntawm leaching, thaum rau -20 hli particle loj, leaching tus nqi tsuas yog 60%. Qhov me me me me ua rau thaj tsam ntawm cov ore, ua kom yooj yim rau kev sib cuag ntawm cov tshuaj leaching thiab cov pob zeb kub kub. Txawm li cas los xij, qhov loj me me me kuj tuaj yeem ua rau muaj teeb meem xws li tsis zoo permeability thiab nce av nplaum ntxhia cuam tshuam.

4.2 Kev cuam tshuam ntawm CaO Dosage

Ntxiv CaO rau cov pob zeb ore tuaj yeem txhim kho qhov permeability ntawm cov ore thiab kho cov pH tus nqi ntawm cov tshuaj leaching. Qhov pom zoo CaO ntau npaum li cas tau pom tias yog 3% ntawm cov ore loj. Ntawm qhov koob tshuaj no, qhov kub leaching tus nqi yog maximized. Qhov qis CaO ntau npaum li cas ua rau tsis txaus pH hloov thiab tsis zoo permeability, thaum ntau npaum li cas yuav ua rau ntau dhau ntawm leaching reagents thiab tej teeb meem ib puag ncig.

4.3 Qhov cuam tshuam ntawm NaCN Concentration

Lub NaCN concentration nyob rau hauv cov tshuaj leaching muaj ib tug tseem ceeb cuam tshuam rau lub kub leaching tus nqi. Raws li NaCN concentration tau nce los ntawm 0.05% mus rau 0.15%, qhov kub leaching tus nqi nce los ntawm 70% mus rau 90%. Txawm li cas los xij, kev nce ntxiv ntawm NaCN concentration mus rau 0.2% tsis tau ua rau muaj kev txhim kho tseem ceeb hauv cov leaching tus nqi thiab tseem nce tus nqi thiab ib puag ncig kev pheej hmoo cuam tshuam nrog. cyanide siv.

4.4 Lub Sijhawm Leaching

Qhov kub leaching tus nqi nce nrog rau ncua sij hawm leaching. Tom qab 25 hnub ntawm leaching, qhov kub leaching tus nqi mus txog lub toj siab, qhia tias feem ntau ntawm cov extractable kub tau yaj. Kev ncua lub sij hawm leaching tshaj li qhov no tsis tau ua rau muaj kev nce ntxiv hauv cov leaching tus nqi tab sis nce tus nqi tag nrho ntawm cov txheej txheem.

5. xaus

Txoj kev tshawb no pom tau hais tias heap leaching yog ib txoj kev siv tau los kho cov qib qis thiab cov av nplaum oxidized kub ore. Los ntawm kev ua kom zoo dua cov txheej txheem, suav nrog ore particle loj, CaO ntau npaum, NaCN concentration, thiab lub sij hawm leaching, kub kub leaching tus nqi txog li 90%. Qhov kev pom zoo tau txiav txim siab raws li hauv qab no: ib qho ore particle loj ntawm -5 hli, CaO ntau npaum li cas ntawm 3%, NaCN concentration ntawm 0.15% hauv cov tshuaj leaching, thiab lub sij hawm leaching ntawm 25 hnub. Cov kev tshawb pom no muab cov kev pom muaj txiaj ntsig zoo rau kev lag luam daim ntawv thov ntawm heap leaching hauv kev rho tawm cov kub los ntawm qib qis thiab cov av nplaum oxidized kub ore, pab txhawb txoj kev loj hlob ntawm kev lag luam kub mining.