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}, …
The optimum conditions for microwave-assisted roasting of refractory gold ore were achieved at 200W, NaClO 3 of 200 kg/tonne ore, and water of 150 kg/tonne ore. Based on the optimization …
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 …
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 ...
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 and Xueyi Guo …
A literature review revealed that the grinding characteristic of refractory gold ore can be improved by microwave pre-treatment. Previous studies have reported that microwave heating has a potential pretreatment process for refractory gold ores [9,15,25–28].
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
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 ...
Gold, a significant precious metal, has high corrosion resistance, excellent electrical and thermal conductivity [].In the field of gold extraction and smelting, refractory gold ore is one of the most important gold resources at present [].Approximately 30% of the world's gold production is derived from refractory gold ore, and this proportion is expected to …
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 …
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.
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.
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",
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.
Microwave technology has been confirmed to be suitable for use in a wide range of mineral leaching processes.
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, …
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).
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 …
The process optimization and mechanism of microwave pyrolysis in a nitrogen atmosphere were studied to improve the gold leaching rate for high-arsenic-refractory gold sulfide resources, mainly containing minerals of elemental sulfur, dense pyrite, and arsenopyrite. The decomposability was evaluated using thermodynamic and thermogravimetric analyses. …
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 ...
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.
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.
Microwave assisted leaching of refractory gold concentrates. Proceedings of the International Congress on Mineral Processing and Extractive Metallurgy, Melbourne, Australia. Australasian Institute of Mining and Metallurgy, Melbourne, pp. 197-199. Links ] ... Use of bacteria to enhance recovery of gold from refractory ores. Minprep 87, ...
Pressure oxidation is a hydrometallurgical oxidative pretreatment for refractory ores, such as sulfide ores. Here, simultaneous alkaline pressure oxidation and sodium cyanide leaching treatments were carried out on a pyritic ore from the Mulatos Mine located in Sahuaripa, Sonora, Mexico. Mineral characterization, agitation leaching, hot cyanidation under …
Biological oxidation of a refractory arsenic-bearing gold ore was investigated to determine the fate of arsenic during processing and to assess the effect of biological pretreatment on gold ...
This research investigated gold recovery from calcine tailings and various pre-treatment processes (mechanisms) most suitable for enhancing gold recovery, such as fine grinding, NaOH leaching, microwave roasting, and microwave …
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 …
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 …
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 …
Semantic Scholar extracted view of "Optimization of Microwave-Assisted Roasting: Box-Behnken Design for Oxidation of Sulfide Minerals and Control of Atmospheric Sulfur in Refractory Gold Ore Pretreatment" by Abdul Hapid et al. ... Current progress on gold recovery from refractory ore and waste electrical and electronic equipment.
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 ...