The ore samples were obtained from a stockpile located in the Peruvian central Andes Volcan Cía Minera where the ore is processed via cyanide leaching to extract silver To study the behavior of the mineral as it enters the processing plant samples were tested as received without milling or sieving
The gold bearing ore was heated as a thick slurry of ore air water and limestone in large pressure chambers The slurry interacted with thiosulfate and a fine bead like material that collects the gold At full capacity 13 400 tons of ore can be processed daily with leaching taking place simultaneously in two sets of seven tanks
Column leaching tests were conducted on minus plus cm ore pieces to evaluate a dual in situ or heap leaching method for the recovery of manganese and silver from domestic manganese deposits The method features an initial leach of the manganese with a 5 wt pct SO2 solution followed by a neutralization rinse and then a second leach of
In tank lixiviation of silver by chlorination the extraction of the silver from chloridized ore by solutions of hyposulphite salts is performed by ore particles are kept stationary while the solvent moves down through the mass of ore The quickness of extraction other conditions alike is in direct proportion to the rapidity of the movement of the
The mineralogical characteristics of the ore were also examined to aid the evaluation of the leaching behavior of gold and silver from the ore 2 Materials and methods Materials In this study high grade Akoluk Ordu refractory gold/silver ore was used A total amount of 150 kg ore sample was obtained from the deposit
Silver was mainly present as acanthite Ag 2 S and electrum and as inclusions within beudantite phase in the ore The cyanide leaching tests showed that the extractions of gold and silver from the ore d 80 50 µm were limited to 76% and 23% respectively over a leaching period of 24 h Diagnostic leaching tests coupled with the detailed
In the leaching step 97% of silver and over 99% of Mn and Zn could be extracted under the optimum conditions 1 mol/L H2SO4 a leaching temperature of 70 °C an S/L ratio of 50 g/L addition of
Finally to analyze the effectiveness of pretreatment using fresh and reused citrate solutions the leaching data of each precious metal was used after six hours of leaching For the silver ore Fig 13 the amount of metal leached with the citrate pretreated material exceeds in all the cycles to that directly leached with thiourea The
Beiya gold silver ore from Yunnan which is a valuable refractory gold silver ore resource in China has attracted significant attention based on its ubiquity and importance Chen et al 2008 Fu et al 2015 He et al 2015 Xu et al 2007 Yang et al 2019 Based on its complicated mineral structures and various occurrence states of low grade gold and silver the
Leaching of gold and silver from the pretreated ore using lixiviant containing amino acids of microbial origin and thiosulphate reproduced from Spasova et al 2006 Cyanide free thiosulphate gold leaching has been researched extensively and applied on an industrial scale since late 2014
Of all these reagents thiourea has attracted much attention due to its high selectivity for gold fast kinetics high silver leaching efficiency environmental and easy control Li and Miller 2006 Leaching of gold from the gold ore by thiourea has been fully taken into account because of its higher leaching efficiency low price and
Some sedimentary minerals have attractive contents of gold and silver like a sedimentary exhalative ore available in the eastern of Hidalgo in Mexico The activation energy obtained during
In the experiments the primary ore was first crushed into − 2 mm particles and then ground to the required size in a laboratory scale ball leaching tests were carried out in a 250 mL round bottom flask in a constant temperature water grams of manganese silver ore was used for each test
The ore samples were obtained from a stockpile located in the Peruvian central Andes Volcan Cía Minera where the ore is processed via cyanide leaching to extract silver To study the behavior of the mineral as it enters the processing plant samples were tested as received without milling or sieving
Although silver bearing lead zinc ore has been the primary silver producing mineral resource in all secondary minerals containing silver worldwide it was not received special treatment in the past by lack of basic research Sverdrup et al 2014 In the sorting of silver bearing lead zinc ore the focus is normally on the processing of base metal concentrates the
The values contained in the main pond vary from the time cyanide is first added to the new batch ore until 6 to 8 weeks later when a new lift of ore is needed for leaching Solution from the first days of leaching will have the highest values ranging from to ounces of silver per ton of solution
In this study an environmental friendly effective process was developed which consisted of oxidation pretreatment thiosulfate leaching and electrodeposition for silver recovery from anode slime and was proposed in the flow chat in Fig the step of oxidation pretreatment MnO 2 was used to treat anode slime in dilute sulphuric acid As an effective and green
This could explain the reason for low silver extractions from the ore under typical cyanide leaching conditions −75 μm g/L NaCN presumably due to the limited exposure of silver phases to
The kinetic of dissolving pure metallic silver in di ammonium tartrate with a hydrogen peroxide solution is discussed in this article The effects of temperature di ammonium tartrate concentration hydrogen peroxide concentration and rotation speed were examined The findings show that there is a favorable correlation between the rotation speed and the rate of
AUTOCLAVE AMMONIA LEACHING OF SILVER FROM LOW GRADE COPPER CONCENTRATES 785 According to X ray phase analysis data Fig 1 the main minerals within the concentrate composition are wt % Ca Na Al Si AlSi2O6 33; mica 16; chalcocite Cu2S 10; chalcopyrite CuFeS2 2; pyrite FeS2 7 The aim of the work is more
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 thiosulfate leaching system exhibits promising
The morphology of the roasted product of a mineral can affect the leaching efficiency of silver However the morphological changes that occur during the specific roasting process cannot be quantitatively analysed using SEM As shown in Fig 4 sodium sulfite had a good leaching effect on the ore Different pure mineral combinations of silver
Ferric EDTA and ferric oxalate are promising alternatives to cupric ammonia for thiosulfate leaching of silver sulfide as they are both unreactive towards thiosulfate with thiosulfate consumptions of only and kg/tonne of ore respectively The most effective thiosulfate lixiviants were cupric ammonia and ferric EDTA when applied to silver sulfide ore leaching
Heap leaching of gold and silver ores is conducted at approximately 120 mines worldwide Heap leaching is one of several alternative process methods for treating precious metal ores and is selected primarily to take advantage of its low capital cost relative to other methods Thirty seven different heap leach operations with a total production of 198 tonnes of
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