Semantic Scholar extracted view of "MICROWAVE IRRADIATION PRETREATMENT OF A REFRACTORY GOLD CONCENTRATE" by K. E. Haque. ... The results demonstrated that a maximum gold recovery of 97% was achieved, and that gold recoveries … Expand. 5. 1 Excerpt; ... Microwave-Assisted Grinding of Bolkardag (Nigde, Turkey) Gold Ore and …
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in microwave-assisted comminution, International Journal of . Mineral Processing, 74, 1-4, pp. 71-83, Nov. 2004. ... in recovery of gold from refractory gold ores has been compared recently.
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Pretreatment of arsenic-bearing gold ore with microwave-assisted alkaline leaching DOI 10.1515/gps-2015-0122 ... the process is slow and the gold recovery can be incomplete [10]. Pressure oxidation, known as a clean and efficient method for strengthening leaching, has been used in the pretreatment of refractory gold ore; however, it requires ...
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DOI: 10.1016/J.MINENG.2007.04.003 Corpus ID: 95371585; Microwave pretreatment of a double refractory gold ore @article{Nanthakumar2007MicrowavePO, title={Microwave pretreatment of a double refractory gold ore}, author={Balakrishnan Nanthakumar and Christopher A. Pickles and Şadan Kelebek}, journal={Minerals Engineering}, year={2007}, …
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Pretreatment is required to improve the recovery of gold from refractory gold ore by exposing the gold surface for leaching. Several oxidation pretreatment methods have been proposed. ... The centerfield, sweep width and the microwave power were set to 3500.0 G, 100.0 G and 6.325 mW. Modulation frequency and modulation amplitude were set to 100 ...
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NaOH is a powerful tool for gold extraction from refractory tailings. Keywords. gold recovery, refractory calcine tailings, ultrafine grinding, alkaline pre-treatment, microwave. Introduction. South Africa has over 500 gold tailings dumps, several of which have the potential to be profitably . reprocessed (Janse van Rensburg, 2016).
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Recovery of Gold from the Refractory Gold Concentrate Using Microwave Assisted Leaching. ... Compared to conventional leaching, microwave-assisted leaching has significant … Expand. 22 [PDF] 2 Excerpts; ... Gold telluride ores are important gold refractory ores due to the presence of sulfides and other gangue materials.
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The resources of refractory gold ores are abundant, and their effective treatment can bring good economic benefits. This paper investigated the kinetics of leaching gold from refractory gold ores by ultrasonic-assisted electro-chlorination. The effects of ultrasound time ratio, initial hydrochloric acid concentration and leaching temperature on the kinetic …
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The recovery of gold from refractory ore could guarantee sustainable development in the gold industry. However, there are many challenges in the treatment of ore, such as environmental pollution and low recovery. ... Pretreatment using microwave-assisted roasting with NaClO 3 as an additive to the oxidizing agent is a new method of processing ...
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ally been depleted, and refractory gold ores (RGOs) make up approximately one-third of the total gold production from natural ores [3–4]. Recovery of gold from RGOs may be car-ried out with approximately <50% efficiency on average by direct cyanidation, which requires pretreatment to liberate the locked and preg-robbed gold [5]. Moreover, the ...
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The recovery rate of gold in the leach residue was improved with microwave-assisted leaching, with a gold recovery of ~132.55 g/t after 20 min of the leaching experiment (2.0 M nitric acid ...
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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, being ...
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In this research, microwave roasting of a double refractory gold ore was investigated as an alternative method and the results were compared to those obtained by conventional roasting.The ...
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Gold particles in refractory ores generally have fine grain sizes and are encapsulated in sulfide minerals. Direct leaching will cause a low in gold recovery. Processing refractory gold ore using conventional methods provides relatively low gold recovery with high environmental impact [14]. Refractory gold ore requires pretreatment to liberate ...
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the refractory gold ores that prevent gold from being liber-ated. Table 1. Chemical composition of raw materials wt% Au Si Fe As Ag S 6.15 2.71 33.70 12.70 21.53 23.21 Fig. 1. X-ray diffraction pattern of refractory gold ore. 2.2. Experimental procedure A ultrasonic cleaner, a DC regulated power supply, and an ICP-AES were used in this work.
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Microwave technology has been confirmed to be suitable for use in a wide range of mineral leaching processes. Compared to conventional leaching, microwave-assisted leaching has significant advantages. It is a proven process, because of its short processing time and reduced energy. The purpose of this study was to enhance the gold content in a …
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Reserves of high-grade gold ore worldwide are decreasing, and some industries have started processing refractory gold ore. Refractory gold ore contains sulfide minerals such as pyrite (FeS 2 ...
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The recovery of gold from refractory ore could guarantee sustainable development in the gold industry. However, there are many challenges in the treatment of ore, such as environmental pollution and low recovery. ... Microwave-Assisted Roasting, Refractory Gold Ore, Sulfide Mineral, Sulfide Mineral Oxidation, Water Leaching",
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In refractory gold ores, the gold is highly encapsulated in the sulfide matrix and pre-treatment is an important process to recover gold from the sulfide minerals. The sulfide minerals interfere …
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Gold miners are facing a reserves crisis, and what is left in the ground is becoming more and more challenging to process.Refractory gold reserves, which require more sophisticated treatment methods in order to achieve oxide-ore recovery rates, correspond to 24 percent of current gold reserves and 22 percent of gold resources worldwide (Exhibit 1).
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The present paper attempts to assess the effects of microwave irradiation on the leachability of refractory gold ores. Characteristics of the crystal structure and microstructure of the ores were determined by x-ray structural analysis (XRD) and scanning electron microscopy (SEM) before and after microwave irradiation. Compared to conventional processes, …
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Microwave technology has been confirmed to be suitable for use in a wide range of mineral leaching processes.
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The leaching efficiencies of metal ions (As, Cu, Zn, Fe, and Pb) and recovery of gold from refractory gold concentrate were investigated via nitric acid leaching followed by microwave treatment.
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The extraction of gold from refractory gold ores (RGOs) without side reactions is an extremely promising endeavor. However, most RGOs contain large amounts of sulfide, such as pyrite. Thus, investigation of the influence of sulfide on the gold leaching process is important to maximize the utilization of RGOs. In this work, the effects of pyrite on the stability of the …
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2.2.2. Microwave-Assisted Leaching: Recovery of Gold Microwave-assisted leaching was performed by heating a 500 mL Pyrex glass containing 200 mL of nitric acid (1.0, 3.0, and 5.0 M) and 20 g of the refractory gold concentrate. Figure1shows the schematic of the laboratory-scale microwave-assisted leaching developed in this study. The flask was
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Recovery of Gold from the Refractory Gold Concentrate Using Microwave Assisted Leaching. ... microwave-assisted leaching has significant … Expand. 22 [PDF] 2 Excerpts; Save. ... Gold telluride ores are important gold refractory ores due to the presence of sulfides and other gangue materials.
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In this study, A novel method for gold recovery from refractory gold ore was proposed with the purpose of improving recovery efficiency of gold and reducing …
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The results demonstrated that a maximum gold recovery of 97% was achieved, and that gold recoveries of the refractory gold concentrate quickly increased to the maximum with …
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Semantic Scholar extracted view of "Microwave heating of gold ores for enhanced grindability and cyanide amenability" by R. Amankwah et al. ... which is an environmentally friendly, low-energy consuming method for recovery from refractory gold-silver ores, was investigated. The ore ... A study on microwave assisted chalcocite leaching was ...
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