Optimization Process of the Refractory Gold Ore Extraction by Hypochlorite Oxidative Leaching

Anuar, W. N. Syafiqah; Ardani, Mohammad Rezaei; Baharun, Norlia; Ismail, Suhaina; Rahman, Shaik Abdul

doi:10.1007/s42461-020-00376-6

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…The next step is separating them into metallic and nonmetallic fractions by means of magnetic, current-based, or density-based separation techniques. After that, metals from the processed e-waste are recovered using pyrometallurgical, electrodeposition, or hydrometallurgical methods [11][12][13][14][15]. Thermochemical decomposition methods are traditionally used to extract gold from e-waste, for example, pyrolysis, during which the organic material contained in electronic waste is broken down into molecular products that can be used, including fuel.…”

Section: Introductionmentioning

confidence: 99%

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Selective Recovery of Gold from E-Waste Recycling Plants’ Waste Fractions: Waste-to-Resource Transition

Zueva,

Ippolito,

Passadoro

et al. 2024

Minerals

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Electronic waste grows globally at a rate of 5% annually, which makes electronic waste recycling (WEEE recycling) an urgent task aimed at achieving (i) environmental protection and (ii) the preservation of mineral resources through the re-introduction of strategic metals into the market. As it turns out, WEEE recycling produces further waste, called WEEE secondary waste, which still contains valuable metals such as gold, silver, and copper. This study assessed the economic viability of recovering these metals and identified the most promising targets and approaches. WEEE secondary waste produced at a plant in southern Europe was sampled and examined for this purpose. The study methods included an ANOVA (analysis of variance) and an OCCP (orthogonal central composition plan). Over 90% gold, silver, and copper extraction was achieved with hydrochloric acid leaching in sodium hypochlorite with sodium chlorite as an oxidizing agent at 60 °C. The significance of the variation in the response for each factor, calculated using the Yates algorithm, demonstrates that by excluding sodium chloride and optimizing the doses of hydrochloric acid and sodium hypochlorite, gold can be selectively recovered through the leaching process. The scenario of HCl (2.5M)/NaClO (5%) leaching results in the maximum extraction effect of Au (91.6%) at the lowest concentrations of Ag and Cu (37–44%).

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Section: Introductionmentioning

confidence: 99%

“…The next step is separating them into metallic and non-metallic fractions by means of magnetic, current-based, or density-based separation techniques. After that, metals from the processed e-waste are recovered using pyrometallurgical, electrodeposition, or hydrometallurgical methods [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Selective Recovery of Gold from E-Waste Recycling Plants’ Waste Fractions: Waste-to-Resource Transition

Zueva,

Ippolito,

Passadoro

et al. 2024

Minerals

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Oxidative Decomposition of Silver Telluride (Ag ₂ Te) Using Hypochlorite in Different Acid Environments

Rodríguez-Chávez

Fuentes-Aceituno

Nava‐Alonso

2022

Mineral Processing and Extractive Metallurgy Review

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An Environmentally Benign Approach for Gold Recovery From Gold-Bearing Ore: Modeling and Optimization

Muanda¹,

Omalanga²,

ANNYFA³

et al. 2023

EJMSE

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The current work focuses on the extraction of gold using alpha-cyclodextrin (α-CD) from the Kimpese quarry in the Democratic Republic of the Congo, through an environmentally friendly gold process as an alternative to the amalgamation process. The ore was sampled and characterized using atomic absorption spectroscopy (AAS) prior to the experiments, and the analysis revealed 0.08% of gold. The ore was then leached with modified aqua regia (MAR). Time, HBr concentration, pH, and stirring speed were all varied during leaching to highlight the parameters that influence the leaching yield. The optimum conditions were determined using analysis of variance (ANOVA) and response surface methodology (RSM), implying time, HBr concentration, pH, and stirring speed of 6 hours, 80g/l, 1, and 800rpm, respectively, and a leaching percentage of 98.6928%. Following leaching, neutralization tests with potassium hydroxide (KOH) were performed by varying the following parameters: time, KOH concentration, and pH. The following factors were varied in the extraction tests after neutralization: time, α-CD concentration, pH. The optimal parameters were as follows: time of 30 minutes, α-CD concentration of 8.8639g/l, and pH of 6, with yield of 89.7350%. This method of recovering gold from ore using α-CD is inexpensive and does not harm the environment.

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Optimization Process of the Refractory Gold Ore Extraction by Hypochlorite Oxidative Leaching

Cited by 3 publications

References 19 publications

Selective Recovery of Gold from E-Waste Recycling Plants’ Waste Fractions: Waste-to-Resource Transition

Selective Recovery of Gold from E-Waste Recycling Plants’ Waste Fractions: Waste-to-Resource Transition

Oxidative Decomposition of Silver Telluride (Ag ₂ Te) Using Hypochlorite in Different Acid Environments

An Environmentally Benign Approach for Gold Recovery From Gold-Bearing Ore: Modeling and Optimization

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Optimization Process of the Refractory Gold Ore Extraction by Hypochlorite Oxidative Leaching

Cited by 3 publications

References 19 publications

Selective Recovery of Gold from E-Waste Recycling Plants’ Waste Fractions: Waste-to-Resource Transition

Selective Recovery of Gold from E-Waste Recycling Plants’ Waste Fractions: Waste-to-Resource Transition

Oxidative Decomposition of Silver Telluride (Ag 2 Te) Using Hypochlorite in Different Acid Environments

An Environmentally Benign Approach for Gold Recovery From Gold-Bearing Ore: Modeling and Optimization

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Oxidative Decomposition of Silver Telluride (Ag ₂ Te) Using Hypochlorite in Different Acid Environments