Recovery of gold from sulfide refractory gold ore:
A complete process of gold recovery from sulfide refractory gold ore was proposed. • The recovery efficiency of Au was increased by adding pyrite during the chlorination roasting. • The maximum recovery efficiency of gold reached 98.06% under In the Reference process, chloride leaching and gold recovery are preceded by sulfide breakdown at elevated temperature and pressure (190°C, 100 psi Direct Cupric Chloride Leaching of Gold from Refractory
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Direct Cupric Chloride Leaching of Gold from Refractory Sulfide
Direct Cupric Chloride Leaching of Gold from Refractory Sulfide Ore: Process Simulation and Life Cycle Assessment MINERAL PROCESSING AND EXTRACTIVE High grade whole ores or upgraded sulfide concentrates can be processed using POX or roasting processes but the high capital and operating costs Comparative investigations on sulfidic gold ore
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A systematic review of sustainable gold extraction from raw ores
Roasting of complex gold ores, namely sulphides and carbonaceous (refractory gold ores), should take place before leaching in order to maximise the Sulfide minerals trap or lock gold particles and make it challenging to extract them through direct cyanide leaching. Another reason for the refractoriness of Gold leaching from ores using biogenic lixiviants A review
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Optimization Process of the Refractory Gold Ore
Refractory gold ore is a type of ore that contains sulfide minerals like pyrite, chalcopyrite, and sphalerite. Thus, this kind of gold ore cannot be leached directly Refractory gold ore: Diagnostic leaching : Complex gold ore: QEMSCAN and diagnostic leaching : Flotation concentrate: Diagnostic leaching : Refractory Automated Mineralogy and Diagnostic Leaching Studies on Bulk
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Simultaneous sulfide oxidation and gold dissolution by
In the current leaching process, the majority of lead will precipitate during gold leaching as lead sulfate due to sulfide oxidation and the very low solubility of lead This study would be useful in understanding the eco-friendly leaching systems of Au and Ag during the hydrometallurgical process of sulfide gold ore. Keywords: concentrated sulfide ore ; ammonium Leaching Behavior of Gold and Silver from
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Metals Free Full-Text Recovery of Gold from the
Gold has excellent physical and chemical properties, and is one of the most important noble metals. The current rapid decline in high-grade gold ores and readily available low-grade gold ores has made ABSTRACT. A simulation-based life cycle assessment was conducted to compare the impacts of different cyanide-free chloride processing routes for refractory ores to determine whether one-stage leaching of gold from the ores could be advantageous over chloride leaching after conventional pressure oxidation from an environmental Direct Cupric Chloride Leaching of Gold from Refractory Sulfide Ore
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Leaching Behavior of Gold and Silver from
Ammonium thiosulfate is an alternative lixiviant for the hydrometallurgical treatment of sulfide gold ores. The present study is primarily focused on ammonium thiosulfate leaching of gold (Au) and Pyrite and arsenopyrite are known to be the most common gold-bearing sulfide minerals in refractory gold ores. Traditionally, these minerals have been first oxidized by roasting, acidic pressure oxidation or bio-oxidation to release gold, after which the gold is dissolved in the subsequent cyanide leaching step.Simultaneous sulfide oxidation and gold dissolution by
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Gold extraction
Types of ore. Gold occurs principally as a native metal, i.e., gold itself.Sometimes it is alloyed to a greater or lesser extent with silver, which is called electrum.Native gold can occur as sizeable nuggets, as fine grains or flakes in alluvial deposits, or as grains or microscopic particles (known as colour) embedded in rock minerals.. Other forms of gold During the roasting of gold concentrate to improve gold recovery, arsenic is released into the air and valuable elements such as Fe, Cu, Zn, and Pb are converted into oxide minerals. In this research, we evaluated the release of As and the loss of valuable metals during the acid baking and hot water leaching processes used for gold Sulfuric Acid Baking—Water Leaching for Gold Enrichment and
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Minerals Free Full-Text Mineral Phase Evolution during MDPI
Arsenious and sulphur-bearing micro-disseminated gold ore is a kind of typical refractory Carlin-Type. The gold in Carlin-Type gold ore grains is distributed finely, existing as invisible or submicroscopic gold, encapsulated in arsenopyrite and pyrite. The technical difficulty of treatment Carlin-Type gold ore lies in how to release the fine gold DOI: 10.1016/J.MINENG.2021.106822 Corpus ID: 233530449; Recovery of gold from sulfide refractory gold ore: Oxidation roasting pretreatment and gold extraction @article{Qin2021RecoveryOG, title={Recovery of gold from sulfide refractory gold ore: Oxidation roasting pretreatment and gold extraction}, author={Hong Qin Recovery of gold from sulfide refractory gold ore: Oxidation
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Characterization of Discarded Lead–Zinc Sulfide Ore Tailings
The lead–zinc ore is a typical low-grade complex polymetallic sulphide ore. Its typical mineralogy is characterized by a high content of cryptocrystalline graphite, low content of lead, zinc, and copper, and fine grain size. However, the aggregation size of sulfide mineral aggregations is coarse, and the symbiotic relationship is relatively Electrodeposited antimony can be treated with sulfuration–volatilization technology, which causes antimony to volatilize in the form of antimony sulfide. During this process, gold is enriched in the residue, thereby realizing the value-added use of antimony and the recovery of gold. In this study, the thermodynamic conditions of antimony Preparation of Antimony Sulfide and Enrichment of Gold by
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(PDF) Hydrometallurgical Processing of Low-Grade
sulfide ores Obviously, containing bioleaching non-ferrous metals. enabled achieving acceptable values of non-ferrous metal recoverystudies Cryomineralogenesis [63]. in natural and technogenic sulfide-containing For antimony-containing gold ore, alkaline sulfide leaching is proven to be an effective and excellent pretreatment method before cyanidation (Awe and Sandström, 2010). This alkaline leaching can remove the harmful elements such as Sb and As which affect the cyanide leaching process, increasing the gold or silver extraction rate (Celep Column bio-oxidation of low-grade refractory gold ore containing
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Recovery of gold from sulfide refractory gold ore: Oxidation
Sulfide gold ores account for a large proportion of refractory gold ores, therefore, it is very meaningful to recover gold from sulfide gold ores (Ubaldini and Vegliò, 2000, Saba, 2011, Hammerschmidt, 2016). Moreover, the major gold leaching process for extracting gold from ores and concentrates is still cyanide leaching.The main steps in the direct chloride leaching process are as follows: atmospheric leaching, gold recovery by solvent extrac-tion (SX), gold reduction, and neutralization steps. In the Reference process, chloride leaching and gold recovery are pre-ceded by sulfide breakdown at elevated temperature and pres-Direct Cupric Chloride Leaching of Gold from Refractory Sulfide Ore
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A review on the negative impact of different elements during
The ongoing depletion of gold and silver-containing ore deposits demands a shift towards the processing of more complex sources. Leaching of gold or silver from these sources, which are named refractory and are typically low-grade, can be complicated due to one or more of the following effects: (1) kinetic or thermodynamic impediments on Roasting of complex gold ores, namely sulphides and carbonaceous (refractory gold ores), should take place before leaching in order to maximise the extraction ratio (Neuvonen, 2013). It should feature in cases where, even following long grinding processes, the exposure of gold to the leaching solution has been minimal (it, of course, A systematic review of sustainable gold extraction from raw ores
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A mechanism of metastable sulfur speciation and the adsorption
During the cyanide leaching of sulfidic gold ores, the sulfide minerals dissolve into the leach solution and produce metastable sulfur species, such as sulfide, bisulfide, polysulfide, elemental sulfur, and thiocyanate. Most of the above sulfur species can directly passivate the gold surface, and significantly reduce the gold leaching efficiency.Hypochlorite leaching system is a strong oxidizing solution for metal sulfides, which are naturally associated with gold extraction. This study evaluated the hypochlorite leaching of refractory gold ore by using the response surface method–central composite design (RSM-CCD) as a statistical approach in determining the optimum Optimization Process of the Refractory Gold Ore Extraction by
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Leaching of Gold and Silver from a Complex Sulfide Concentrate
The leaching behaviors of gold and silver from a complex sulfide concentrate in copper-tartrate-thiosulfate solutions were investigated in this paper. Experimental parameters, including temperature, initial pulp pH, and concentration of copper, tartrate, and thiosulfate, were systematically studied. The copper-tartrate The natural gas brine sample contained natural gas and high concentrations of iodide, i.e., about 120 ppm. The gold leaching was performed in a liquid culture medium that contained sulfide ore with a gold content of 0.26 wt%, the marine broth, and potassium iodide. The test was conducted in a pulp density of 3.3 w/v% for 30 days at 30 °C.Gold leaching from ores using biogenic lixiviants A review
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