Investigation on the cyanide leaching optimization for the treatment of KCGM gold flotation concentrate—phase 1

Deschênes, G.; McMullen, J.; Ellis, S.; Fulton, M.; Atkin, A.

doi:10.1016/j.mineng.2005.01.025

Cited by 12 publications

(6 citation statements)

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“…Deschenes et al [27] suggested that high lime concentration with the addition of lead nitrate and the injection of oxygen would improve the leaching rate. This was further verified in experiments using KCGM gold flotation concentrates [28]. It was found that under the above conditions, the cyanide consumption could be reduced from 15 kg/t to 3.5-4.0 kg/t.…”

Section: Cyanide Leachsupporting

confidence: 53%

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Processing technologies for gold-telluride ores

Zhang

Richmond

et al. 2010

Int J Miner Metall Mater

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Gold telluride ores are important gold refractory ores due to the presence of sulfides and other gangue materials. The classification and main physical properties of gold telluride ores were described, and possible treatment methods including flotation, leaching, and oxidation were reviewed. The results show that flotation procedures are much easier for gold tellurides compared to other refractory gold-bearing ores. For the conventional cyanide leaching process, pretreatment such as oxidation is required to achieve high gold recovery. Roasting is a relatively simple but not environment-friendly method; bio-oxidation technology seems to be more suitable for the oxidation of flotation concentrate. Other treatment methods involve cyanide leaching, thiourea leaching, ammoniacal thiosulfate leaching, carbon-in-pulp, and resin-in-pulp, all of which are less commonly utilized.

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Section: Cyanide Leachsupporting

confidence: 53%

“…Effect of lime concentration on the leaching kinetics of calaverite (8×10 −6 mol/L O 2 ; 500 mg/L NaCN; 500 g/t lead nitrate; AuTe 2 : 57 g/t; 10 μm powder)[28].…”

mentioning

confidence: 99%

Processing technologies for gold-telluride ores

Zhang

Richmond

et al. 2010

Int J Miner Metall Mater

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“…Parts of tailings from these processing plants, exposed to atmospheric conditions, are very liable to generate AMD over time. The gold processing tailings dam contains Cl − , and NO 3 − ions because of using hydrochloric acid (HCl) or nitric acid (HNO 3 ) in the acid washing stage [30] and lead nitrate in cyanidation [31,32]. Moreover, scaling up the mining and processing operations has risen the demand for groundwater sources.…”

Section: Preparation Of Combined Amd-waste Effluent From Refractory Gold Processingmentioning

confidence: 99%

Performance Evaluation of Fe-Al Bimetallic Particles for the Removal of Potentially Toxic Elements from Combined Acid Mine Drainage-Effluents from Refractory Gold Ore Processing

et al. 2021

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Acid mine drainage (AMD) is a serious environmental issue associated with mining due to its acidic pH and potentially toxic elements (PTE) content. This study investigated the performance of the Fe-Al bimetallic particles for the treatment of combined AMD-gold processing effluents. Batch experiments were conducted in order to eliminate potentially toxic elements (including Hg, As, Cu, Pb, Ni, Zn, and Mn) from a simulated waste solution at various bimetal dosages (5, 10, and 20 g/L) and time intervals (0 to 90 min). The findings show that metal ions with greater electrode potentials than Fe and Al have higher affinities for electrons released from the bimetal. Therefore, a high removal (> 95%) was obtained for Hg, As, Cu, and Pb using 20 g/L bimetal in 90 min. Higher uptakes of Hg, As, Cu, and Pb than Ni, Zn, and Mn also suggest that electrochemical reduction and adsorption by Fe-Al (oxy) hydroxides as the primary and secondary removal mechanisms, respectively. The total Al3+ dissolution in the experiments with a higher bimetal content (10 and 20 g/L) were insignificant, while a high release of Fe ions was recorded for various bimetal dosages. Although the secondary Fe pollution can be considered as a drawback of using the Fe-Al bimetal, this issue can be tackled by a simple neutralization and Fe precipitation process. A rapid increase in the solution pH (initial pH 2 to >5 in 90 min) was also observed, which means that bimetallic particles can act as a neutralizing agent in AMD treatment system and promote the precipitation of the dissolved metals. The presence of chloride ions in the system may cause akaganeite formation, which has shown a high removal capacity for PTE. Moreover, nitrate ions may affect the process by competing for the released electrons from the bimetal owing to their higher electrode potential than the metals. Finally, the Fe-Al bimetallic material showed promising results for AMD remediation by electrochemical reduction of PTE content, as well as acid-neutralization/metal precipitation.

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“…It is also pertinent to note that the excessive addition of lead ions could retard the extraction of gold (Deschênes et al, 1998;Deschênes et al, 2003). Deschênes et al (2005) also reported the beneficial effect of lime treatment in conjunction with lead nitrate on the cyanide leaching of gold tellurides. They also noted that the beneficial effect of lead nitrate addition was more apparent when the ore was subjected to ultrafine grinding.…”

Section: Introductionmentioning

confidence: 99%

Effects of lead nitrate and pre-aeration on the deportment of base/precious metals in cyanide leaching of a pyritic refractory gold concentrate

Deveci,

Yazici,

Celep

et al. 2023

Physicochem. Probl. Miner. Process.

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This study was undertaken to improve gold and silver extraction from a pyritic gold flotation concentrate, which assayed 11 g/t Au, 42 g/t Ag, 0.21% Cu, 3.57% Zn, and 31% Fe. Direct cyanide leaching of the concentrate at 1.5 g/L NaCN yielded a low gold extraction (37%), confirming its refractory nature. Effects of lead nitrate (200-500 g/t Pb(NO3)2) and pre-aeration (24 h) before cyanide leaching at 1.5-3.5 g/L NaCN were investigated. Earlier studies have focused on the impact of these parameters on gold leaching. Besides gold, this study demonstrated the behaviour of silver and base metals (copper and zinc) from the pyritic gold concentrate. Adding lead nitrate had a negligible effect on gold extraction whilst improving silver extraction. Dissolution of copper was substantially suppressed by adding lead nitrate, i.e., from 23% (no Pb(NO3)2) to 4% (500 g/t Pb(NO3)2) over 24 h. Zinc dissolution was negligible (≤0.01%). Pre-aeration of the concentrate improved the gold and silver extractions by 4-14% and 23-44% at the subsequent cyanide leaching (1.5-3.5 g/L NaCN). However, it did not affect the leaching of copper. Only negligible leaching of zinc (≤0.6%) occurred during cyanide leaching. Pre-aeration also reduced cyanide consumption in subsequent cyanide leaching (1.5 g/L NaCN), i.e., from 2.83 kg/t to 2.03 kg/t NaCN per solids. These results suggested that lead nitrate can improve silver extraction while suppressing copper dissolution, which would be advantageous in the leaching-adsorption circuit (CIP), mitigating the dissolved copper-associated problems. Pre-aeration can also be suitable for improved gold/silver extractions and reduced reagent consumption.

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Investigation on the cyanide leaching optimization for the treatment of KCGM gold flotation concentrate—phase 1

Cited by 12 publications

References 0 publications

Processing technologies for gold-telluride ores

Processing technologies for gold-telluride ores

Performance Evaluation of Fe-Al Bimetallic Particles for the Removal of Potentially Toxic Elements from Combined Acid Mine Drainage-Effluents from Refractory Gold Ore Processing

Effects of lead nitrate and pre-aeration on the deportment of base/precious metals in cyanide leaching of a pyritic refractory gold concentrate

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