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An arsenopyrite refractory ore was pretreated with NaOH to increase gold extraction. • After pretreatment, gold and silver were leached with copper ammonium thiosulfate solution. • Thiosulfate leaching of the asreceived ore extracted only 21% and
Optimization of the pretreatment process of gold refractory ore from Zarshuran gold mine was carried out using Taguchi methodorthogonal array
Pretreatment of the Refractory Gold Charge. The pretreatment stage included the regrinding of the ore to two particle sizes: 75 and 105 µm in size (−200#
mainly about the refractory gold leaching easily through arsenic removal to expose gold, changing the composition, physicchemical and electrochemical properties of the ore.
This study investigates the optimization of simultaneous dissolution of gold and silver from a refractory gold ore through determination of pretreatment stages.
Carbonaceous refractory gold ore has been an important gold ore resource for the sustainable development of the gold industry. Solving the harmful effects of
Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80% even after fine grinding. 1) Arsenicbearing refractory gold ore
In this study, the refractory behavior of Kaletaş ore was investigated within a diagnostic approach Pretreatment of the ore via roasting and ultrafine grinding prior to
Microscopic gold inclusions in sulfide minerals cannot typically be extracted by conventional cyanidation. The gold ore must be pretreated to oxidize sulfide minerals
The clear solution drawn off from an agitator is run to two settling vats 16 ft. 6 in. in diameter by 4 ft. deep. The solution stands in settlers until any cloudiness has settled. It is then run through a sand
mainly about the refractory gold leaching easily through arsenic removal to expose gold, changing the composition, physicchemical and electrochemical properties of the ore. Currently, there are four main methods of pretreatments of refractory gold ores with As. Pretreatment options for dealing with refractory gold ores are illustrated in Fig
The above studies on microwave pyrolysis pretreatment of refractory gold ore focused on the gold carrier mineral pyrite, 38 and the control characteristics of the inert gas bringing out pyrolysis products during the microwave heating process have not been investigated. A study on the high arsenic content of HARGR microwave pyrolysis control
Refractory gold ore is usually affected by the associated carbonaceous matter through the pregrobbing effect, which is eliminated by oxidation roasting, followed by leaching, to achieve a satisfactory gold leaching efficiency. Roasting–leaching experiments, pore structure measurements, scanning electron microscopy (SEM), and Xray diffraction
The goldbearing sample was identified as a highsulfur finesized wrappedtype refractory gold concentrate. The gold leaching efficiency obtained by direct cyanidation was only 59.86%. Improved gold and silver extraction from a refractory antimony ore by pretreatment with alkaline sulphide leach, Hydrometallurgy, 105(2011),
The nitric acid pretreatment experiments for refractory silver ore and gold/silver concentrate were performed for 2.5 hours at 5M HNO 3 and 80 o C. Before and after nitric acid pretreatment
ABSTRACT Carlintype refractory gold deposits are complex bodies which only occur in certain regions such as the western United States, southwest China, and northwest Iran. It is important to investigate the most suitable treatment option for each deposit from the point of the mineralogical composition. The present study investigates
Extraction of Gold from a LowGrade Double Refractory Gold Ore Using FlotationPreoxidationLeaching Process. Yongbin Yang, Liu Shiqian, Bin Xu, Qian Li, T. Jiang, P. Lv. Materials Science. . The treatment process of a lowgrade refractory gold ore containing sulfide minerals and carbonaceous matters was studied in this work.
Gold is known for its high value and may be the first metal used by humans for ornamental purposes, which is still in use (Asamoah et al., 2014; Marsden and House, 2006;Amankwah and OforiSarpong
Refractory Ore Pretreatment Processes. A “fine” grind in a gold production plant might produce a particle size distribution in which 80% of the ore is finer than 44 µm. Ultrafine grinding can be defined as a process that produces an 80% passing size of 20 µm or less. Depending on the size distribution of gold particles, ultrafine
Statistics show that the proportion of refractory gold ore is as high as 60% 70% of the total reserves in the world’s gold ore. But the proportion of gold production from refractory ore is just about 30% of the total gold production in the world. As the refractory gold resources have not been utilized well, countries around the world attach
DOI: 10.1016/J.MINENG..106822 Corpus ID: 233530449; Recovery of gold from sulfide refractory gold ore: Oxidation roasting pretreatment and gold extraction @article{QinRecoveryOG, title={Recovery of gold from sulfide refractory gold ore: Oxidation roasting pretreatment and gold extraction}, author={Hong Qin and Xueyi Guo
于大伟,yudawei,中南大学, Recovery of gold from sulfide refractory gold ore: Oxidation roasting pretreatment and gold extraction于大伟,Dawei Yu English > Journal Publications. Recovery of gold from sulfide refractory gold ore: Oxidation roasting pretreatment and gold extraction Hits: Release time:0527. Impact Factor:3.795
Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80% even after fine grinding. 1) Arsenicbearing refractory gold ore has stones extremely difficult to deal with. In the stones, gold is locked up in arsenic mineral matrix as the form of microscopic or submicroscopic lattice.
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
The microwave pretreatment results showed positive improvements at pilot scale mining applications in . The results of ore pretreatment using electric and ultrasonic methods showed up to 24% and 66% improvement in energy consumption, respectively. The former and the latter have been piloted for gold and carbonate ore,
Refractory gold ore pretreatment Treatment of refractory gold ore (whole ore and flotation concentrates) has become more prominent since the 1980s, with many gold discoveries often including ores that are wholly or
Extraction of Gold from a LowGrade Double Refractory Gold Ore Using FlotationPreoxidationLeaching Process. Yongbin Yang, Liu Shiqian, Bin Xu, Qian Li, T. Jiang, P. Lv. Materials Science. . The treatment process of a lowgrade refractory gold ore containing sulfide minerals and carbonaceous matters was studied in this work.
Biooxidation Pretreatment of Refractory Sulfidic and SulfidicCarbonaceous Gold Ores and Concentrates Author(s) J.A. Brierley J.A. Brierley Newmont Technical Facility, 10101 East Dry Creek Road, Englewood, CO 80112 The mineralogy of the refractory gold ore determines the effectiveness of the biooxidation process. The ore must possess
Biooxidation Heap Pretreatment of Sulfide Refractory Gold Ore. ROBERT W. BARTLETT College of Mines and Earth Resources,University of Idaho,Moscow, Idaho, 838443025View further author information. Pages 89124 Received 15 Jan 1996. Accepted 04 Mar 1996. Published online: 26 Mar 2008.
carbonaceous matter (CM), the ore is said to be double refractory (Nyavor and Egiebor, 1992). In such ores, gold particles may sometimes be occluded or included in the sulfide minerals and pretreatment is necessary to decompose the mineral structure to liberate gold for subsequent recovery. The CM acts as a pregrobber
