plant design for leaching gold with thiourea
A systematic review of sustainable gold extraction from raw ores …
Environmentally friendly ligands, alternatives to cyanide, are desired to extract gold for the sustainable hydrometallurgy of gold. Leaching characteristics of gold were examined using thiourea (TU) and ethylene thiourea (ETU) as ligands from three types of gold ores with different Fe contents from 2.70 to 14.09 wt% under the acidic condition.
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Thiourea Leaching of Gold | 5 | Gold Metallurgy and the …
The use of thiourea as an alternative lixiviant to gold cyanidation for processing gold-bearing ores or concentrates was first developed by Soviet metallurgists in the 1940s. …
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Thiourea leaching of gold from processed municipal solid waste
Application of the thiourea-Fe 3+ leaching system resulted in recovery of 16.4 ± 1.56 mg/kg of gold from the fine-grained PIR within 6 h of incubation. Due to high gold market prices, upscaling of the suggested technology can represent a suitable strategy for gold recovery from PIR and other MSWI residues.
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A Study on the Adsorption Characteristics of Thiourea by Typical …
In order to improve the thiourea gold leaching rate of a low-grade arsenic–sulfur-containing refractory gold ore in Xinjiang, a microbial pretreatment was used to oxidize pyrite and arsenopyrite to obtain a bio-oxidation residue. The main minerals were quartz, mica, and some sulfides that were not fully oxidized. In this study, the static …
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Improved thiourea leaching of gold with additives from calcine by
In this work, thiourea leaching with/without additives coupled with mechanical activation was studied to extract gold from a refractory gold concentrate calcine. The composition of the calcine is complex and contains many elements such as iron, silicon, and aluminum. 14.76% of the gold is occluded by a passivating layer of iron …
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Recovery of precious metals from electronic waste and spent catalysts
Thiourea (CS(NH 2) 2) is a promising gold extracting agent for its high leaching rate and eco-efficiency (Wronski and Luczak, 2010). The electron pairs between nitrogen and sulphur atoms have a better potential for a coordination bond between gold and silver during thiourea leaching ( Lacoste-Bouchet et al., 1998 ; Deschênes and …
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Thiourea Leaching: An Update on a Sustainable …
Thiourea Leaching: An Update on a Sustainable Approach for Gold Recovery from E-waste. Journal of Sustainable Metallurgy. Authors: Daniel A Ray. …
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Effect of Acid Leaching Pre-Treatment on Gold Extraction from …
The recovery of gold from the board "as is" with thiourea leaching was not feasible due to the low liberation grade of the metal, and a recovery of only 15% was obtained. Direct leaching with thiourea on the board comminuted to 0.5 mm, and failed owing to the competition between copper and gold for thiourea to form the respective …
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Mineral Processing Plant Design, Practice, and Control: Bullion
The variables tested were solution flow rate, recycle ratio, reagent addition combinations of guar and thiourea, and addition amount of acid mist suppressant CAL FAX DBA-70 at constant operating ...
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A Review of Thiosulfate Leaching of Gold: Focus on Thiosulfate …
Thiosulfate leaching is a promising alternative to cyanidation, and the main hindrances for its wide commercial application are the high thiosulfate consumption and the difficult recovery of dissolved gold. In this review, the four solutions to reduce the consumption of thiosulfate, including the control of reaction conditions, the use of …
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Environmentally friendly extraction of gold from
Thiosulfate leaching is a non-toxic and eco-friendly alternative method to cyanidation. However, thiosulfate leaching was used to leach gold from the gold concentrate calcine, and gold extraction effect was poor. To achieve effective leaching of gold, thiourea was added to facilitate gold extraction.
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A general overview of gold processing steps.
Another alternative method for processing gold ore is using more environmentally friendly reagents. Thiosulphate and thiourea are currently an alternative to cyanide reagents because they show the ...
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Thiourea
Leaching gold with thiourea is a successful, cost-effective measure as thiourea rapidly reacts with gold and has less environmental impact than cyanide leaching (Zhang et al., 2009). Thiourea solution was used for leaching a sulfide concentrate, resulting in the extraction of 83% gold and 75% silver in 4 h ( Hiskey, 1984 ).
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Improving the gold leaching process of refractory ores using the
Abstract. Gold ores have been a subject of numerous investigations aimed at enhancing gold recovery and improving leaching kinetics. This is because the cyanidation process cycle, although well established and well researched, remains a process of long duration. To reach the acceptable gold recoveries i.e., +80%, some ores are leached for …
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Ferric Chloride Thiourea & Brine Leaching to Recover Silver
Brine leach solution was prepared by adding 250 g/L NaCl to acidified water and heating to 55° C. Sufficient residue from the thiourea leach was added to the hot leach solution to vary the pulp density from 2 to 8.2 pct solids. The slurry was mixed for a specified time and filtered through a hot Buchner funnel.
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Gold recovery from waste printed circuit boards of mobile phones …
The complexation of gold(I) with thiourea formed a cationic complex, Au [SC (NH 2) 2] 2 +. The leaching efficiency of gold from pyrolyzed PCBs using thiourea was approximately 59%, lower than 90% from shredded PCBs with a particle size of 100 mesh (0.149 mm) . Therefore, thiourea leaching should be largely influenced by the particle …
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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 sulfide gold ores and concentrates. The present study investigated the leaching behavior of Au from …
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Sodium Thiosulphate Gold Leaching
Alternative reagents that have been seriously considered for gold include chlorine, bromine, iodine, thiocyanate, thiourea, ammoniacal thiosulphate and ammoniacal copper cyanide. By necessity, all form strong complexes with gold enabling gold to be leached in a practical Eh range. Thiosulphate provides the strongest alternative complex …
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Analysis and Prediction of the Thiourea Gold Leaching …
The thiourea (TU) leaching of gold from refractory ores can be considered an alternative to cyanidation. However, the high reagent consumption causes an increase in cost, which seriously limits its use. In …
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Improved thiourea leaching of gold with additives from calcine by
The schematic diagram of the mechanical activation equipment (0.6 L, MJ 10, Ouhua, China) used in the thiourea leaching test is shown in Fig. 1.The mechanical activation device reduces the particle size of minerals which liberates gold from the mineral and enhances the kinetics of the leaching process.
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Cyanide-free gold leaching in exceptionally mild chloride solutions
Cyanide-free mild chloride leaching was investigated. •. Gold could be recovered even at <520 mV vs. Ag/AgCl in carbon-in-chloride-leach mode. •. Copper was a stronger oxidant than iron in gold leaching. •. Gold was oxidized by in-situ dissolving impurities. •. Seawater contains enough chlorides to dissolve gold.
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Challenges and opportunities in the recovery of gold …
Thiourea has also been investigated as a leachant, which, in the presence of iron sulfate, creates the water-soluble cationic gold(I) complex Au[SC(NH 2) 2] 2 + . 59 A potential drawback in thiourea leaching is that the high …
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Gold Ore Processing, Volume 15
Feasibility Study Plant Design . 1. Introduction; 2. General Site Issues; 3. Crushing and Ore Storage; 4. Grinding ... Thiourea Leaching; 4. Halide Leaching; 5. Oxidative Chloride Leach Processes; 6. Sulfide/Bisulfide/Sulfite Leaching ... New Plant Design; Other Gold-Bearing Materials. Chapter 53. Gold – A Key Enabler of a Circular …
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A review of gold leaching in acid thiourea solutions
The plant, part of the FENIX project, consists of two hydrometallurgical technologies of which, GOLD REC 1, includes an oxidative base metal leaching method combined with thiourea leaching for ...
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(PDF) Alternatives to cyanide in the gold mining …
More recently, Lacoste-Bouchet et al. [40] used thiourea to leach gold from ore containing 0.4% Cu and 5.6g/t Au obtained from the Val d'Or Mine in Quebec. Gold
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Alternative Lixiviants to Cyanide for Leaching Gold Ores
More recent development of a thiosulfate-leaching plant at Barrick Gold's Goldstrike operation has alluded to the complex and unstable nature of this method of …
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Investigate of Effective Factors on Extraction of Silver from …
Study on silver extraction from lead flotation plant tailings using thiourea leaching. Factors analyzed include iron(III) sulfate concentration, thiourea concentration, size, and temperature. ... Deschênes, G. and Ghali, E. (1998) Thiourea Leaching of Copper-Gold Ore Using Statistical Design. Hydrometallurgy, 47, 189-203. ... Li, J.-Y., Li, …
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An innovative thiourea gold leaching process
An innovative thiourea gold leaching process. Stefano Ubaldini. 1998, Hydrometallurgy. The aim of this experimental work was devoted to the preliminary evaluation of the feasibility of thiourea leaching for the extraction of gold from a domestic gold-bearing ore 4 g/t Au, at laboratory scale. The study has permitted identification of the ...
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(PDF) Cyanide Leaching of Copper-Gold-Silver Ores
The proposed leaching approach significantly reduces the cyanide consumption by at least 75% and most of the copper is present as cupric glycinate in the final leach solution. In addition, gold ...
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Processing technologies for gold-telluride ores | SpringerLink
Other treatment methods involve cyanide leaching, thiourea leaching, ammoniacal thiosulfate leaching, carbon-in-pulp, and resin-in-pulp, all of which are less commonly utilized. ... The design and operating practice of bacterial oxidation plant using moderate thermophiles, ... Reaction chemistry of gold leaching in thiourea solution for a ...
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