Investigating heap bioleaching: Effect of feed iron concentration on bioleaching performance

Hille, Robert P. van; Zyl, Andries W. van; Spurr, Nicholas Robert Louis; Harrison, Susan T.L.

doi:10.1016/j.mineng.2010.01.011

Cited by 29 publications

(17 citation statements)

References 15 publications

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“…Irrigation rates for industrial heap operations are a function of the surface area that must be covered by the irrigation solution, typically 4 -18 L m -2 hr -1 [9,34,35]. The independent timing of each valve and variable motor speed may be controlled to obtain the desirable irrigation scheme.…”

Section: Description Of Variable Operating Parametersmentioning

confidence: 99%

A novel experimental system for the study of microbial ecology and mineral leaching within a simulated agglomerate-scale heap bioleaching system

Govender

Bryan

Harrison

2015

Biochemical Engineering Journal

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Heap bioleaching systems are complex, with multiple sub-processes interacting at various scales within the heterogeneous reaction environment. This provides a challenge to determining the growth characteristics of micro-organisms and reaction characteristics of the mineral ore in a representative environment. The experimental system presented in this paper was designed to simulate heap bioleaching conditions using multiple, identically constructed agglomerate-scale mini-column reactors. Ore samples were prepared representatively as grab samples of a larger heap. Particle size distributions and agglomerate masses of the prepared ore samples were shown to be similar within acceptable variance and provided comparable surface areas for microbial colonisation and chemical reaction. The microbial abundance within the whole ore system was determined from effluent sampling for the planktonic population and the systematic and sequential sacrifice of identically operated mini-column reactors to determine the change in the ore-associated microbial population with time. Microbial colonisation and growth rate kinetics were determined from analysis of these populations. The growth curves obtained for the bulk flowing solution and ore-associated populations at the base case operating conditions were reproducible, within a 95 % confidence interval.

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Section: Description Of Variable Operating Parametersmentioning

confidence: 99%

A novel experimental system for the study of microbial ecology and mineral leaching within a simulated agglomerate-scale heap bioleaching system

Govender

Bryan

Harrison

2015

Biochemical Engineering Journal

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“…2). 순환 방법은 drip irrigation 방식인 single drip point로 용출-용액을 100 ml/분 속도로 순환시켰다 (Logan et al, 2007;Qin et al, 2008;van Hille et al, 2010). 용출실험이 진행되는 동안 pH와 Eh를 측정 하였으며, 분석용 용액시료 4 ml를 3시간 간격으 로 채취하였다.…”

Section: 더미 미생물용출 실험unclassified

“…이와 같은 결과는 및 정체구간 형성, jarosite와 같은 2차 생성물 형 성에 의하여 산소와 이산화탄소 확산 제한으로 무 기적 산화작용 방해, 이로 인한 박테리아의 생물학 적 산화작용과 대사작용이 제한받기 때문이다. 이 들 요인들이 서로 복합적으로 작용하여 결국 유용 금속이 낮게 용출된다 (Wu et al, 2009;van Hille et al, 2010;Dhawan et al, 2013).…”

Section: 유용금속 용출 및 맥석광물의 용해 특성unclassified

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The Characteristic Dissolution of Valuable Metals from Mine-Waste Rock by Heap Bioleaching, and the Recovery of Metallic Copper Powder with Fe Removal and Electrowinning

Kim¹,

Cho²,

Choi³

et al. 2014

Journal of the Mineralogical Society of Korea

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: In order to recover the metallic copper powder from the mine-waste rock, heap bioleaching, Fe removal and electrowinning experiments were carried out. The results of heap leaching with the mine-waste rock sample containing 0.034% Cu showed that, the leaching rate of Cu were 61% and 62% in the bacteria leaching and sulfuric acid leaching solution, respectively. Sodium hydroxide (NaOH), hydrogen peroxide (H 2 O 2 ) and calcium hydroxide (Ca(OH) 2 ) were applied to effectively remov Fe from the heap leaching solution, and then H 2 O 2 was selected for the most effective removing Fe agent. In order to prepare the electrolytic solution, H 2 O 2 were again treated in the heap leaching, and Fe removal rates were 99% and 60%, whereas Cu removal rates were 5% and 7% in the bacteria and *Corresponding author: +82-62-230-7878, E-mail: cybpark@chosun.ac.kr 김봉주⋅조강희⋅최낙철⋅박천영 -208 -sulfuric acid leaching solutions, respectively. After electrowinning was examined in these leaching solution, the recovery rates of Cu were obtained 98% in bacteria and obtained 76% in the sulfuric leaching solution. The dendritic form of metallic copper powder was recovered in both leaching solutions.

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“…Capillary distribution of the liquid is the slower of the two and largely accounts for lateral movement of the liquid. This can result in poor wetting of heaps overall, with preferential flow channels forming in the regions below the drip emitters and poor recovery of the desired metals being achieved in the remaining regions (O'Kane Consultants Inc., 2000; Petersen and Dixon, 2003;van Hille et al, 2010). This is well demonstrated in the photographs of a heap cross-section in Petersen and Dixon (2003) which shows clear evidence of solution channels below the drip emitters.…”

Section: Introductionmentioning

confidence: 98%

Magnetic resonance imaging characterisation of the influence of flowrate on liquid distribution in drip irrigated heap leaching

Fagan-Endres

Harrison

Johns³

et al. 2015

Hydrometallurgy

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Liquid irrigation is one of the key process control parameters following the construction of an ore leaching heap. This study uses 3D magnetic resonance imaging (MRI) to examine noninvasively the effect of liquid flowrate changes on heap hydrology when drip irrigation is used. Experimental results from a vertical column show that the increase in flowrate causes an increase in the number of rivulets in the ore bed. The new rivulets were found to be thicker, and their development caused an increase in liquid-solid contacting area which is considered advantageous for metal ion recovery. Experiments performed on larger samples showed that the effects of flowrate changes were limited to the region directly below the drip emitter because the increase in flowrate caused an increase in macro-pore flow and not capillary retention of liquid. Therefore the increase in flowrate was not found to perturb liquid distribution patterns in a way that would be substantially advantageous to heap leaching recoveries.

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Investigating heap bioleaching: Effect of feed iron concentration on bioleaching performance

Cited by 29 publications

References 15 publications

A novel experimental system for the study of microbial ecology and mineral leaching within a simulated agglomerate-scale heap bioleaching system

A novel experimental system for the study of microbial ecology and mineral leaching within a simulated agglomerate-scale heap bioleaching system

The Characteristic Dissolution of Valuable Metals from Mine-Waste Rock by Heap Bioleaching, and the Recovery of Metallic Copper Powder with Fe Removal and Electrowinning

Magnetic resonance imaging characterisation of the influence of flowrate on liquid distribution in drip irrigated heap leaching

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