Beneficiation of a gold bearing enargite ore by flotation and As leaching with Na-hypochlorite

Curreli, L.; Ghiani, M.; Surracco, Marco; Orrù, G.

doi:10.1016/j.mineng.2005.01.023

Cited by 41 publications

(10 citation statements)

References 2 publications

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“…Plackowski et al (2012) have provided an excellent review of the flotation response of enargite [Cu 3 AsS 4 ] in sulphide systems. A bulk flotation process using sulfydryl collectors was found to be beneficial in treating a complex ore containing gold-bearing enargite (Curreli et al, 2005). A bulk flotation process using sulfydryl collectors was found to be beneficial in treating a complex ore containing gold-bearing enargite (Curreli et al, 2005).…”

Section: Flotation Of Copperegold Oresmentioning

confidence: 99%

Flotation of Gold and Gold-Bearing Ores

Dunne

2016

Gold Ore Processing

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Section: Flotation Of Copperegold Oresmentioning

confidence: 99%

Flotation of Gold and Gold-Bearing Ores

Dunne

2016

Gold Ore Processing

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“…(Baghalha, 2007). 그리고 염소-차 아염소산은 gold 용출율이 빠르고 독성이 없기 때 문에 정광이나 광미(slime)로부터 Au와 Ag 용출 (Almeida and Amarante, 1995;Jeffrey et al, 2001;Baghalha, 2007;Nam et al, 2008), 황동석 정광 으로부터 Cu 용출 (Puvvada and Murthy, 2000;Ikiz et al, 2006) 혹은 황비동석(enargite)으로부터 As 용출에 사용된다 (Curreli et al, 2005;Padilla et al, 2005). 또한 이 용매제는 광재(furnace slag) 로부터 Cu 용출 (Herreros et al, 1998), 폐전자제 품으로부터 Au, Sb, Sn 등을 용출하는데 사용되었 다 (Saleh et al, 2001).…”

Section: 서 론unclassified

The Leaching of Gold-silver from Refractory Gold Concentrate by Chlorine-hypochlorite Solution

Cho¹,

Kim²,

Oh³

et al. 2012

Journal of the Mineralogical Society of Korea

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: Leaching experiments of gold and silver from roasted concentrate were carried out using a chlorine-hypochlorite solution. The leaching rate of gold was 75% at 1.5:1 ratio of chlorine and hypochlorite and increased to 81% with adding 1 M NaCl. However, at 1% pulp density and at 65℃, the leaching rates of Au were close to 100%. XRD analysis identified quartz in the solid residues after digestion of roasted concentrate with aqua regia or chlorine-hypochloride leaching solution. This suggests that the gold may not be leached out of the quartz in aqua regia or chlorine-hypochlorite solution. In order to leach the gold from the quartz, the concentrate will have to be pre-treated through ultra-fine grinding or treated with stronger oxidative agents.

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“…Furthermore, selective leaching often employs sulfide (S 2-), bisulfide (HS -) or polysulfides (S x 2-) to first extract the arsenic as AsS 4 3and AsS 3 3- (Delfini et al, 2003;Anderson and Twidwell, 2008;Tongamp et al, 2010a,b). However, hypochlorite leaching (Viñals et al, 2003;Curreli et al, 2005;Mihajlovic et al, 2007), ammoniacal leaching (Gajam and Raghavan, 1983), and fine-grinding to mechanically activate the enargite surface (Balaz and Achimovicova, 2006) have been investigated to increase the normally slow reaction kinetics. Because gold ores are becoming more refractory due to increasing arsenic contents as a result of enargite, these methods are being examined more closely by the gold-mining industry.…”

Section: Introductionmentioning

confidence: 99%

Spectroelectrochemistry of enargite I: Reactivity in alkaline solutions

Gow¹,

Young

Huang

et al. 2015

Mining, Metallurgy & Exploration

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The presence of enargite (Cu 3 AsS 4) is problematic in gold processing because it is environmentally hazardous due to its arsenic content but also because it is refractory, causing both cyanide and oxygen consumption to increase. Selective leaching and treatment of the arsenic would prove advantageous prior to applying conventional gold leaching methods. The reactivity of enargite samples from Butte, Montana and Quiruvilca, Peru were spectroelectrochemically studied under alkaline conditions, pH range of 8-13, using Raman spectroscopy and cyclic voltammetry. Raman spectra of the surface were collected during and after voltammograms were potentially cycled in order to determine and compare surface species against theoretical E H-pH diagrams determined from mass-balanced thermodynamic calculations using StabCal software. Under slightly oxidizing conditions, covellite (CuS) peaks were found in a short matter of time, above ~100mV vs SHE for pH 9-13, suggesting arsenic leaching specifically occurred. At longer conditioning times, elemental sulfur was observed and tended to passivate the surface. The presence of elemental sulfur suggests that copper was eventually leached from the surface. By operating above pH 12, under slightly reducing conditions near-300mV vs SHE, arsenic can be selectively leached as thioarsenate (AsS 4 3-) or thiosulfate (AsO 4 3-) without sulfur formation.

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Beneficiation of a gold bearing enargite ore by flotation and As leaching with Na-hypochlorite

Cited by 41 publications

References 2 publications

Flotation of Gold and Gold-Bearing Ores

Flotation of Gold and Gold-Bearing Ores

The Leaching of Gold-silver from Refractory Gold Concentrate by Chlorine-hypochlorite Solution

Spectroelectrochemistry of enargite I: Reactivity in alkaline solutions

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