Alkaline cyanide leaching of refractory gold flotation concentrates and bio-oxidised products: The effect of process variables

Asamoah, Richmond K.; Skinner, William; Addai‐Mensah, Jonas

doi:10.1016/j.hydromet.2018.05.010

Cited by 46 publications

(14 citation statements)

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“…Such mineralization is composed mainly of base metal sulfides that make up the ore [31][32][33] such as pyrite (FeS 2 ) associated with quartz (SiO 2 ), as shown in the micrograph on Figure 2. To complete the characterization study, the mineral was analyzed by scanning electron microscopy (SEM) along with energy dispersive X-ray spectrometry (EDS).…”

Section: Discussionmentioning

confidence: 99%

Determination of Dissolution Rates of Ag Contained in Metallurgical and Mining Residues in the S2O32−-O2-Cu2+ System: Kinetic Analysis

et al. 2018

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Section: Discussionmentioning

confidence: 99%

Determination of Dissolution Rates of Ag Contained in Metallurgical and Mining Residues in the S2O32−-O2-Cu2+ System: Kinetic Analysis

et al. 2018

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“…Bacterial oxidation is one of the promising and rapidly developing directions in the field of processing refractory gold-bearing raw materials [5,[10][11][12]. Currently, more than 100 firms and organizations in countries such as South Africa, Ghana, Zimbabwe, Australia, Uzbekistan, USA, Brazil, Canada, Russia, Peru, China, etc.…”

Section: Methodsmentioning

confidence: 99%

Prerequisites for Processing a Foam Product in the Process of Bacterial Oxidation of Gold-Bearing Concentrates in a Separate Cycle

2021

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The recovery of gold from refractory ores and concentrates is a significant problem in the modern gold processing industry. The use of bacterial oxidation technology at the Navoi Mining and Metallurgical Combine (Uzbekistan) made it possible to increase the share of recoverable gold during the processing of refractory ores from the Kokpatas and Daugyztau deposits. However, during the operation of the biological installation, a problem arose of abundant foaming in bacterial oxidation reactors. This article is devoted to the issue of foaming during biooxidation and its negative impact on the oxidation process. Methods of combating foaming and the choice of the optimal solution, providing for the processing of bio-oxidation foam in a separate cycle, have been analyzed.

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“…These figures show the need to develop and promote the investigation of gold extraction processes, specifically in low recovery minerals with traditionally used processes (Cornejo, 2010) (Domic, 2001), due to its complex structure the extraction is avoided of the valuable metal of the gold and copper deposits (Lovera D, 2003) (Meissl Roberto J, 2011) and in the kinetic models and the intrinsic surface reaction of the dissolution of gold respectively (Sipi Seisko, 2018). In addition to evaluating new, more environmentally friendly processes that can be sustainable over time, both environmentally and economically (Severo, 1993), one of the fundamental aspects of gold leaching rates is that they are low to the conditions of sulphurous and oxidized gold ores (Asamoah, 2018), highlighting the mineralogical complexity and its variation to pre-treatments. Within this context, the present investigation established the extraction process using H2SO4 as a leaching medium and as oxidizing salts NaCl and KNO3 in different concentrations, to achieve the production of Cl and royal water, achieving the leaching of valuable mineral.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the inhibition process effect “Preg-robbing” for gold recovery (AU)

Figueroa

Aragón

Pacheco

et al. 2020

VUCSM

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Currently, the National Society of Mining, Petroleum and Energy (SNMPE) states that in recent years the production of gold in Peru has reduced, since in 2016 there was a production of 153 MT, compared to 2005 with a production of 208 MT. Until 2018, a production decrease of 5.4% was established and in 2017 a decrease of 11.3%. Currently there is a need to develop research on gold extraction processes in low recovery minerals with traditionally used processes, due to the complex structure of gold that prevents their extraction. It is necessary to evaluate new processes that are environmentally friendly and that are sustainable in the environmental and economic aspects. In the present work, the applicability of leaching with NaCl and KNO3 in acid medium in a sulphurous gold mineral was evaluated, through the process of leaching with oxidizing salts, which allows to process hydrometallurgy the various forms of gold minerals present in nature. The sample is composed in percentages by Quartz 24%, Carbonates Dolomite 22%, Calcite 6%, Arsenopyrite 19%, Pyrite 5%, Galena 4% and clays associated with traces of Native Au-Electrum, which were interfering with the process of leaching of the sample. A pretreatment by gravimetric concentration was carried out using the Falcón equipment, with the aim of releasing the encapsulated gold and eliminating the interfering agents, facilitating the leaching action of the oxidizing salts. When testing the concentrations of the oxidizing salts, it was found that for the concentrations of 86.86 g/l of NaCl, 21.96 g/l of KNO3 and 125.93 g/l of H2SO4, a maximum recovery of 26.62% gold was obtained. Based on the results from the factorial design, an increase in gold extraction performance was observed; obtaining a maximum recovery of 29.31% of the gold; in the process it was determined that dissolved gold is affected by the presence of clays, producing the "Preg-robbing" effect of the valuable metal and consequently decreasing the recovery of gold after 8 leaching hours. According to the results, it is concluded that the leaching process with oxidizing salts in acidic medium for the type of mineral used, is mainly affected by the presence of coarse gold and electrum associated with clays, establishingconditions of degree of release according to the granulometry in the gold leaching process.

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Alkaline cyanide leaching of refractory gold flotation concentrates and bio-oxidised products: The effect of process variables

Cited by 46 publications

References 30 publications

Determination of Dissolution Rates of Ag Contained in Metallurgical and Mining Residues in the S2O32−-O2-Cu2+ System: Kinetic Analysis

Determination of Dissolution Rates of Ag Contained in Metallurgical and Mining Residues in the S2O32−-O2-Cu2+ System: Kinetic Analysis

Prerequisites for Processing a Foam Product in the Process of Bacterial Oxidation of Gold-Bearing Concentrates in a Separate Cycle

Evaluation of the inhibition process effect “Preg-robbing” for gold recovery (AU)

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