Silver sulfide leaching with thiosulfate in the presence of additives Part II: Ferric complexes and the application to silver sulfide ore

Deutsch, Jared L.; Dreisinger, David

doi:10.1016/j.hydromet.2013.03.013

Cited by 21 publications

(6 citation statements)

References 11 publications

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“…Moreover, thiosulfate exhibits excellent performance in dealing with carbonaceous or copper-bearing gold ores or concentrates where gold recovery by cyanidation is poor or cyanide consumption is high [7][8][9][10][11]. Accordingly, numerous studies have been carried out on the kinetics and mechanism of gold and silver leaching in thiosulfate-based solutions [12][13][14][15][16][17]. However, with many years of progress and development, traditional copper-ammonia-thiosulfate leaching systems still have some urgent problems to be solved, such as high consumption of thiosulfate, ammonia nitrogen wastewater, and difficulty in gold recovery [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Leaching of Gold and Silver from a Complex Sulfide Concentrate in Copper-Tartrate-Thiosulfate Solutions

Chen

Xie

Wang

et al. 2022

Metals

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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 performance in dealing with the complex sulfide concentrate. Thiosulfate consumption could be greatly reduced due to the in-situ generation of thiosulfate derived from sulfur or disulfide ions. Increasing the temperature and concentrations of copper, tartrate, and thiosulfate can promote gold leaching. A low tartrate content and a moderate increase in temperature and copper and thiosulfate concentrations can accelerate silver leaching, but a higher temperature or copper content may depress silver extraction. A suitable pulp pH is critical for gold and silver leaching in copper-tartrate-thiosulfate solutions. An extraction of 74.50% Au and 36.33% Ag was obtained with the direct leaching of the concentrate, while the percentages can be significantly increased up to 82.60% and 70.38%, respectively, when leaching the calcine following the oxidative roasting pretreatment. The recycling of leaching solutions demonstrates that a suitable free tartrate content is of great significance in maintaining the stability of the novel system. As an alternative to the traditional cyanide or copper-ammonia-thiosulfate leaching processes, the copper-tartrate-thiosulfate leaching system provides an environmentally friendly, nontoxic, and relatively low-cost method for gold and silver leaching from ores or concentrates.

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Section: Introductionmentioning

confidence: 99%

Leaching of Gold and Silver from a Complex Sulfide Concentrate in Copper-Tartrate-Thiosulfate Solutions

Chen

Xie

Wang

et al. 2022

Metals

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“…It was attempted to replace the conventional roasting stage prior to leaching by leaching the refractory coppergold ore in a solution containing 0.8 M S2O3 2-, 0.05 M Cu 2+ and 4M NH3 [3]. During the leaching of a sulphide silver ore ferric-EDTA (ethylenediaminetetraacetic acid) complex was used as an alternative to the cupricammonia catalysed thiosulfate system [4]. To the traditional thiosulfate solutions, sodium chloride, sodium sulphide, sodium carbonyl cellulose (CMC), sodium carbonyl starch (CMS) and humic acid sodium salt (HA) have been added to improve the leaching of a refractory gold ore [5].…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Leachability of a silica-rich quartzite conglomerates containing a layer of pyrite Using CIP and CIL

Kalenga

Ntuli

2020

METAL 2020 Conference Proeedings

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South Africa is amongst the influential producers of gold worldwide. Many results have been published on its ores and different parameters defined. Although the carbon-in-pulp (CIP) and carbon-in-leach (CIL) have been largely investigated, optimum parameters change with the chemical composition of the ore based on the geological origins. The ore used in the present work was silica-rich quartzite conglomerates containing a layer of pyrite. The optimization of the gold recovery from the ore used and the better processing route between CIP and CIL were investigated and adopted. Alternating variations were conducted and most suitable leaching parameters were identified. Mineralogical test work conducted in the present investigation led to a better understanding of the ore mineralogy and assisted efficiently in resolving the reasons of impeding cyanidation with this ore. Also, the mineralogical results were compared with the ore, which is treated conventionally and identification of the problematic minerals was possible. XRD, XRF and AAS were used for characterization.

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“…To overcome this main disadvantage, alternative non-cyanide systems have been developed which include the utilization of thiosulfate and thiourea (Groenewald et al, 1976;Oncel et al, 2005;Ficeiova et al, 2005;Deutsch et al, 2013;Celep et al, 2018). Thiosulfate leaching is considered a non-toxic process that can effectively recover Au and Ag in the presence of Cu 2+ (Salinas-Rodríguez et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Recovery and separation of silver and mercury from hazardous zinc refinery residues produced by zinc oxygen pressure leaching

et al. 2019

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Hazardous zinc refinery residues that contain Ag and Hg are a typical complex material obtained from zinc oxygen pressure leaching and currently there are few economically viable methods for disposal or reuse. The research presented here offers an effective approach for the comprehensive recovery of Zn, Fe, Cu, Ag and Hg from this highly toxic waste. During the initial hot-acid leaching stage, leaching efficiencies of 96.3% Zn, 96.0% Fe and 97.5% Cu were obtained, whereas the leaching of Ag and Hg were less than 0.2%. This resulted in the simultaneous separation of Zn, Fe and Cu and the enrichment of Ag and Hg ca. 300%. Subsequently, the leaching residues obtained from hot-acid leaching was further leached using acidic thiourea solution (pH = 1). The results of this second leaching step showed the almost 93% of Ag and 98% of Hg could be extracted using 20 g/L thiourea and 4 g/L Fe 3+ , with a L/S ratio of 8 and a temperature of 40 °C for 2 hours. The residue after thiourea leaching could be used as raw material in lead smelting. In the next step based on zinc powder cementation, the recovery of Ag and Hg both reached 99.0% and the cementation residue comprised of 53.1 wt. % Ag and 11.7 wt. % Hg. The main phases present included Ag, Hg3Ag2 and Ag2S and these can be further treated by vacuum distillation in order to separate Hg from Ag. These findings demonstrate that high recoveries of Zn, Fe, Cu, Ag and Hg from the toxic waste could be achieved with stepwise leaching followed by zinc powder cementation. This treatment protocol for toxic zinc refinery residues not only avoids the potential harm to the environment but also significantly improves the economics of the process.

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Silver sulfide leaching with thiosulfate in the presence of additives Part II: Ferric complexes and the application to silver sulfide ore

Cited by 21 publications

References 11 publications

Leaching of Gold and Silver from a Complex Sulfide Concentrate in Copper-Tartrate-Thiosulfate Solutions

Leaching of Gold and Silver from a Complex Sulfide Concentrate in Copper-Tartrate-Thiosulfate Solutions

Comparison of the Leachability of a silica-rich quartzite conglomerates containing a layer of pyrite Using CIP and CIL

Recovery and separation of silver and mercury from hazardous zinc refinery residues produced by zinc oxygen pressure leaching

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