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Pyrometallurgical routes have conventionally been used for the recovery of gold from e-waste (Udayakumar et al., 2022).However, these recovery processes are cost-intensive and require high energy to burn off gold and other metals (Park and Kim, 2019, Jadhao et al., 2022).They often produce an enormous amount of slag and release …
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This paper aims to review the extraction of gold using alternatives to cyanide with focus on NESGLs. The paper starts with an overview on the non-cyanide gold lixiviants. ... Over the past three decades, considerable literature has examined the alternatives to cyanide for extracting gold from different ores/concentrates (Abbruzzese …
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In assessing the percentage of gold extraction in the different conditions at 25 and 40 °C, it was observed that the kinetics of extraction is sensitive to temperature change, which suggests that the leach is chemically controlled. ... The selection of these reagents was based on a review of scientific literature (Aylmore, 2005; Eksteen and ...
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Jeffrey et al. (2008a,b) observed that increasing the pH value from 8.5 to 10.5 increased the gold leaching efficiency from 7% to 70% from a pressure-leach residue of a refractory …
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Cobalt is a strategic and critical mineral whose demand is expected to grow rapidly. This study aims to provide a comprehensive summary of cobalt extraction and recovery research from 2012 to 2021 in the form of bibliometric analysis. The work was based on the Science Citation Index Expanded (Web of Science) and carried out using the InCites of …
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Thiosulfate leaching has been regarded as a promising alternative to cyanidation, but it still faces the challenge of the recovery of low content of gold from high concentrations of thiosulfate solutions. Liquid–liquid extraction is a method to address this issue but is still limited by the use of volatile and toxic organic solvents. To overcome …
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In this paper, we summarized the research progress and remaining challenges in gold extraction using these noncyanide reagents. After a brief …
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Importantly, no gold was dissolved using these conditions. In the stage-2 leaching, selective extraction of gold is observed with bromide leaching with 3 M sulfuric acid with 3 M sodium bromide at 70 °C, over a 1 h time and 500 rpm agitation speed. ... Anderson CG (2016) Literature review of hydrometallurgical recycling of printed circuit ...
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Mechanical separation, pyro-metallurgical, hydrometallurgical, and bio-hydrometallurgical technologies have been extensively used to recover gold from secondary sources (Cui and Zhang, 2008, Fleming, 1992, Rhee et al., 1995, Yap and Mohamed, 2007).Gold has mostly been leached out from ores, secondary sources and …
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The authors in this paper makes an attempt to propose a novel integrated model for the recovery of precious metals (gold - Au and silver - Ag) for the management of e-waste using a combination of ...
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PDF | On Apr 28, 2023, Faten Hadi Fakhri published Review of liquid-liquid extraction | Find, read and cite all the research you need on ResearchGate
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1. Introduction. The governing method for gold ore processing has been cyanide leaching since the late 19th century (Marsden and House, 2006).After decades of active development of the process for various types of ores and concentrates, there are several different hydrometallurgical flowsheets for cyanide leaching.
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A direct gold extraction from WEEE by selective leaching and precipitation would have many advantages. Due to raising social awareness of the ecological impacts of cyanidic gold extraction and environmental specifications, cyanide cannot be used as gold extractant in modern processes. ... This publication offers a thorough literature review …
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Innovation plays a critical role in the mining industry as a tool to improve the efficiency of its processes, to reduce costs, but also to meet the increasing social and environmental concerns among communities and authorities. Technological progress has also been crucial to allow the exploitation of new deposits in more complex scenarios: …
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Another alternative method for processing gold ore is using more environmentally friendly reagents. Thiosulphate and thiourea are currently an alternative to cyanide reagents because they show the ...
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They found that L-histidine permed best in overall gold extraction and the reduction of thiosulfate consumption, due to its stronger ability of complexing cupric ions. Eksteen and Oraby (2015a) compared the extraction of gold from gold foils using glycine, histidine, and alanine under the same conditions (0.5 M amino acid, pH 11, and 60 °C ...
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Alkaline sulfur-containing lixiviants are expected to serve as alternatives in industrial applications of gold extraction, particularly for refractory gold ores containing copper and...
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For this latter aspect, we focus on methods in the primary research literature for which an understanding of the chemical mode of action has been developed; as such, a detailed analysis of the patent literature is not in the scope of this review. Gold recovery from printed circuit boards A typical PCB comprises 40% metals, 30% plastics and 30% ...
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Gold deposits are arguably more widely distributed through geological time, and present in more geological environments, than the economic concentrations of any other metal.
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The study sought to test the applicability of Hotelling's rule to gold extraction in South Africa. In environmental economics, Hotelling's rule has come to be a pillar of the exhaustible resources framework and in addition to this, it has presented essential insights into the consumption and extraction of non-renewable resources. …
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This paper aims to review the extraction of gold using alternatives to cyanide with focus on NESGLs. The paper starts with an overview on the non-cyanide …
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The global literature review consisted of a screening, extraction, compilation, and analysis of existing and accessible literature according to predefined criteria (Table 1). A total of 116 resources were reviewed, including articles, reports from international and non-governmental organizations, guides and methodologies, toolkits, …
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In this review, we outline some of the latest chemical approaches that have been reported for the recovery of gold from discarded mobile phones and other WEEE. 22,23 Gold is the most valuable component of e-waste, with estimates for its consumption to fuel our technology-driven society at 263.3 MT per year. 7,24 We provide an overview …
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Here we report an approach based on reduced graphene oxide (rGO) which provides an ultrahigh capacity and selective extraction of gold ions present in ppm …
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The gold leaching percentage and thiosulfate consumption of cobalt-glycine system are 94.85 % and 17.38 kg/t-ore, it has higher gold leaching percentage and lower thiosulfate consumption than copper-ammonia system. 99.27 % of gold in the leaching solution of cobalt-glycine system is adsorbed on resin, which could be recovered by one …
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Hydrometallurgical gold recovery processes play a pivotal role in the gold mining industry, contributing to more than 90% of global gold production. Among the array of techniques available, the Merrill–Crowe process, adsorption, ion exchange, and solvent extraction are central in extracting gold from leach solutions. While the Merrill–Crowe …
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Article PDF Available Literature Review. ... Maximum extraction of gold (ca. 80%) was observed at 2.0 M HCl, a point at which the extraction of the. other metal ions ...
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A systematic literature review was conducted to identify and evaluate existing publications on LCSA in the gold mining sector. This study follows the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) (Page et al. 2021a, b, c; Rethlefsen et al. 2021) as a guideline throughout the work from the identification of …
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PE series jaw crusher is usually used as primary crusher in quarry production lines, mineral ore crushing plants and powder making plants.
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