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Thiourea leaching of gold from processed municipal solid waste
Several studies demonstrated that Au can be recovered from thiourea leaching solution by adsorption on activated carbon [59,60,61] and organic materials (e.g., persimmon tannin ... Jing-ying L, Xiu-li X, Wen-quan L (2012) Thiourea leaching gold and silver from the printed circuit boards of waste mobile phones. Waste Manag 32(6):1209–1212. ...
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Review of gold leaching in thiosulfate-based solutions
Numerous non-cyanide leaching lixiviants have been developed, among which thiosulfate is considered the most promising alternative to cyanide due to its non-toxicity, low …
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Gold Leaching in an Alkaline Thiourea Solution
adshelp[at]cfa.harvard.edu The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86A
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Optimization of efficient stable reagent of alkaline thiourea solution
Study on the factors influencing thiourea consumption in the gold-leaching process with acidic thiourea solution[J]. Engineering Chemistry and Metallurgy, 1994, 15(3): 229–234. (in Chinese) Google Scholar SA Ben-jia, ZHANG Fang-yu, CHENG Hua. Study on gold dissolving in alkaline thiourea solution [J]. Gold,1984, 5(3):45–47.
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Effect of Stabilizer on Gold Leaching with Thiourea in …
The effects of these stabilizers on the activation energy of alkaline thiourea gold leaching was also studied. The results showed that sodium silicate was more suitable as a stabilizer in this ...
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Optimization of Gold Dissolution Parameters in Acidified Thiourea
The nature of gold (Au) ore deposits plays an essential role in determining the best gold recovery method as an alternative to cyanidation, considering environmental concerns. Thiourea (Tu) leaching of gold is an alternative lixiviant for treating
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A REVIEW OF GOLD LEACHING IN ACID THIOUREA …
Bruckard, W. J., Sparrow, G. J., Woodcock, J. T., and Zhu, T., 1991, "Effect of iron removal and reduction on gold and silver extraction by thiourea leaching of a pressure oxidation product."
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Improved thiourea leaching of gold from a gold ore using additives
The gold leaching percentage and thiosulfate consumption of cobalt-glycine system are 94.85 % and 17.38 kg/t-ore, it has higher gold leaching percentage and lower thiosulfate consumption than copper-ammonia system. 99.27 % of gold in the leaching solution of cobalt-glycine system is adsorbed on resin, which could be recovered by one-step ...
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a Review of Gold Leaching in Acid Thiourea Solutions
a Review of Gold Leaching in Acid Thiourea Solutions Li, Jinshan; Miller, Jan D. Abstract. Publication: Mineral Processing and Extractive Metallurgy Review. Pub Date: September 2006 DOI: 10.1080/08827500500339315. Bibcode: 2006MPEMR..27..177L full text sources ...
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(PDF) Gold Recovery from Chloride Leaching Solutions by
Currently, the adsorption methods (e.g., CIP / CIL) are by far dominating the recovery of gold from leaching solutions, especially in cyanide media.
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Synergistical thiourea and thiosulfate leaching gold from a gold
At present, non-cyanide extracting gold methods include thiourea (TU) leaching [6], thiocyanate leaching [7], halogen leaching [8], and thiosulfate (TS) leaching [9], [10].Among them, thiourea [6], halogen [8], and thiocyanate [7] leaching are used to leach gold under acidic conditions, which are corrosive to the equipment, and many base metals ions are dissolved in …
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A REVIEW OF GOLD LEACHING IN ACID THIOUREA SOLUTIONS
Since the initial report of thiourea as a complexing reagent for gold leaching, considerable research has been directed toward the use of thiourea as an alternative to cyanide for gold extraction from different auriferous mineral resources. At the same time, some fundamental investigations of the system have been reported. In this article, a review of both …
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A REVIEW OF GOLD LEACHING IN ACID THIOUREA SOLUTIONS
Kenna, C. and Moritz, P., 1991, "The extraction of gold from bioleached pyrite using novel thiourea leaching technology," In World Gold '91, Gold Forum on Technology & Practice, Second Australia IMM-SME Joint Conference, April 21–26, Melbourne, Australia : Australasian Institute of Mining and Metallurgy, pp. 133 – 137 .
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Evaluation of gold adsorption on activated carbon from real …
Prior to leaching, the gold concentrate was subjected to a series of washes and cleaning with CaClO 3, and regulating the pH with Ca(OH) 2. In addition, oxygen was used as oxidant agent for cyanide leaching, and H 2 SO 4 as oxidant agent for thiourea leaching. The control of the potential of solution was performed using a multimeter connected ...
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Review of gold leaching in thiosulfate-based solutions
Several studies on gold leaching in thiosulfate-based solutions have been carried out over the years [13] [14] [15][16]. Gold leaching in thiosulphate media is associated with electrochemical ...
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Optimization of Gold Dissolution Parameters in Acidified …
thiourea leaching performance, such as control of redox potential, thiourea concentration, pH, oxidizing agent, and leaching time. However, these conditions are known to vary from
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Thiourea-thiocyanate leaching system for gold
In thiourea-thiocyanate solutions, the gold leaching rate remains constant with time, which means the mixed ligand exhibits behavior similar to thiourea solutions. Increasing ferric concentration leads to a small increase in the gold leaching rate when ferric sulfate concentration increases from 0.0055 M to 0.022 M with no increase
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Optimisation of efficient auxiliary agents of gold leaching in an
Thiourea as a kind of green and eco–friendly gold lixiviant, was employed to substitute cyanide in the present study of gold leaching. The investigation was carried out on a finely disseminated gold ore from Hongmiao (Hunan province, China) in alkaline thiourea solution with indispensable stable reagents of Na 2 SO 3 and (NaPO3)6.
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An innovative thiourea gold leaching process
The thiourea advantages are a low environmental impact, an easier handling of reagent, a greater selectivity towards gold and silver and fast kinetics of gold dissolution 5, 6.An additional advantage over cyanide exists when treating refractory sulphide gold-containing ore, requiring biooxidative pretreatment; this results in highly acidic solutions, requiring …
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Thiourea leaching of gold in presence of jarosite and role of …
per 0.5 h. During the leaching of gold foil or jarosite, 5mL of solution sample was withdrawn every 1 h for subsequent chemical analysis. After the leaching was complete, the gold foil was taken out of the solution, while the pulp was directly filtered through a 0.45 μm filter paper; the leached gold foil and residue obtained were
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Research status and prospect of gold leaching in alkaline …
In this paper, fundamentals, development and the recent research progresses of gold leaching in alkaline thiourea solution, which is the most prospective substitute for …
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Leaching of Gold in Acid Thiourea-thiocyanate Solutions using …
The leaching of gold in ferric-thiourea-thiocyanate solutions has been studied by the rotating-disk technique. The effects of initial concentrations of ferric, thiourea (Tu), thiocyanate ...
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A highly efficient clean hydrometallurgy process for gold leaching …
Under these conditions, gold leaching achieved an ultra-high efficiency, rapidly leaching gold from a roasted gold concentrate within 30 min. Moreover, the addition of NTA into the Fenton/thiourea system lowered the solution potential and eliminated side-reactions between Fe 3+ ions and thiourea, reducing the consumption of thiourea from ...
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Thiourea Gold Leaching
Thiourea leaching has been reported to be affected to a much lesser degree by the presence of some of these cyanidation inhibitors. In fact, one study suggests that copper, antimony, and arsenic minerals, and activated carbon actually increase the effectiveness of …
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Leaching of gold in thiocyanate solutions. Part 1: chemistry and
A mixed-metal solution was used to accurately simulate the spent lixiviant from thiosulfate/thiourea leaching of mine tailings. ... The leaching of gold by thiocyanate solutions is performed at ...
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Thiourea Leaching: An Update on a Sustainable Approach …
Thiourea leaching of gold, despite rst being reported in 1941 [54], has never been clearly established into industry. Only a few industrial applications were reported between
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Improved thiourea leaching of gold from a gold ore using additives
In this paper, oxalate and citrate were used as additives to enhance the thiourea leaching of gold from a gold ore. The leaching results showed that the thiourea consumption …
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The leaching kinetics of gold from gold scraps in CI2 …
Whereas some accompanying elements like Se, Te, V, Cr and Ni in the concentrate were insoluble in the acidic thiourea solution. Gold was recovered from the leach liquor by adsorption on the ...
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Research status and prospect of gold leaching in alkaline thiourea solution
The thiourea process has been most widely studied mainly because thiourea is not detrimental to the environment, nontoxic to humans, and the dissolution of gold in thiourea solutions is much faster than in cyanide solutions. Dissolution of gold in thiourea solution was reported first in 1941 and continued in 1960s (Lin and Huarng, 1994). It has ...
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Gold Leaching by Sodium Chloride and Calcium Hypochlorite Solutions
Previous studies have addressed the effect of the initial pH of the chloride —hypochlorite solution on the leaching of the gold present in the sulphide ores. ... İpekoğlu Ü (2005) Leaching of Ovacık gold ore with cyanide, thiourea and thiosulphate. Miner Eng 18(3):363–365. Article Google Scholar Baghalha M (2007) Leaching of an oxide ...
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