Ammoniacal thiosulphate leaching of gold ore

Ammoniacal thiosulphate leaching of gold finds a better substitute as it is non-toxic and environmentally safe as compared to the toxic cyanide system for gold extraction. In the present study, an attempt is made to assess the feasibility of ammoniacal thiosulphate leaching of gold ore samples from two

(PDF) Ammoniacal thiosulphate leaching of gold ore

The ammoniacal thiosulphate leaching of gold is dependant on both ammonia and thiosulphate concentration. The leaching is improved significantly at a particular ratio of ammonia to thiosulphate...

Ammoniacal thiosulfate leaching of refractory oxide gold ore

10/07/2017 Besides, ammonia is an integral part of thiosulfate leaching of gold as it prevents the thiosulfate decomposition in aqueous solutions. In the absence of ammonia, thiosulfate decomposes and forms a sulfur coating on the surface of ore particles which leads to the gold passivation. Furthermore, ammonia prevents the dissolution of iron oxides, silica, silicates, and carbonates which

Ammoniacal thiosulfate leaching of refractory oxide gold ore

Ammoniacal thiosulfate leaching of refractory oxide gold ore was investigated. According to X-ray fluorescence and fire assay analyses, the ore contained about 33.01 wt% Si, 8.53 wt% Al, 7.26 wt% K, 3.00 wt% Fe, and 2.80 ppm Au. Moreover, X-ray diffraction analysis and mineralogical studies using polished thin sections showed that the ore was composed of quartz, epidote, muscovite, and

(PDF) Ammoniacal thiosulfate leaching of gold from a

Most studies have focused on thiosulfate leaching of free milling ores and, to some extent, pregrobbing ores. In this study, leaching of gold from the refractory Kaletaş ore (in which gold/silver...

Ammoniacal thiosulfate leaching of gold from a refractory

In this study, leaching of gold from the refractory Kaletaş ore (in which gold/silver alloy is the only mode of occurrence detected) in ammoniacal thiosulfate solutions was studied.

Ammoniacal thiosulfate leaching of refractory oxide

Ammoniacal thiosulfate leaching of refractory oxide gold ore was investigated. According to X-ray fluorescence and fire assay analyses, the ore contained about 33.01 wt% Si, 8.53 wt% Al, 7.26 wt% K, 3.00 wt% Fe, and 2.80 ppm Au.Moreover, X-ray diffraction analysis and mineralogical studies using polished thin sections showed that the ore was composed of quartz, epidote, muscovite, and

AMMONIACAL THIOSULPHATE LEACHING OF A COPPER-RICH GOLD ORE

Cyanide leaching of the ore resulted in a gold extraction of only 22% while gold extractions as high as ~62% were achieved by ammoniacal thiosulphate leaching. The concentrations of thiosulphate

Ammoniacal thiosulphate leaching of Ovacik gold ore

Request PDF On Oct 6, 2017, F. Arslan and others published Ammoniacal thiosulphate leaching of Ovacik gold ore Find, read and cite all the research you need on ResearchGate

(PDF) Ammoniacal thiosulfate leaching of gold from a

Ammoniacal thiosulfate leaching of gold from a refractory ore using a full factorial design Oktay Celep1, Haci Deveci1, İbrahim Alp1, Ersin Yazici1 Duygu Dinç2 and Celal Duran3 1. Hydromet B&PM Group, Karadeniz Technical University, Turkey 2. Adularya Energy and Electricity Generation and Mining Inc., Turkey 3. Dept. of Chemistry, Karadeniz Technical University, Turkey ABSTRACT Thiosulfate

Thiosulfate leaching of gold—A review ScienceDirect

The ammoniacal thiosulfate leaching process for gold and silver extraction has been reviewed in terms of leaching mechanism, thermodynamics, thiosulfate stability, and gold recovery options. The application to different ore types and process options have also been discussed. The thiosulfate leaching process it catalysed by copper and has several advantages over the conventional

Ammoniacal thiosulphate leaching of Ovacik gold ore

DOI: 10.1201/9780203747117-90 Corpus ID: 198235766. Ammoniacal thiosulphate leaching of Ovacik gold ore @inproceedings{Arslan2017AmmoniacalTL, title={Ammoniacal thiosulphate leaching of Ovacik gold ore}, author={Fatma Arslan and B. Sayiner}, year={2017} }

Ammoniacal thiosulphate leaching of Ovacik gold ore

DOI link for Ammoniacal thiosulphate leaching of Ovacik gold ore. Ammoniacal thiosulphate leaching of Ovacik gold ore book. By F. Arslan, B. Sayiner. Book Mineral Processing on the Verge of the 21st Century. Click here to navigate to parent product. Edition 1st Edition. First Published 2000. Imprint Routledge. Pages 6. eBook ISBN 9780203747117. ABSTRACT

Gold recovery from ammonia-thiosulfate leaching

01/11/2019 Gold leaching in the ammoniacal thiosulfate system shows a complex dependence on the variation of the thiosulfate, copper and ammonia concentration in the solution. The concentration ratio of thiosulfate to ammonia should be maintained in a range of 0.5–1.0 ( Xu et al., 2017 ) in order to keep Cu(II) as Cu(NH 3 ) 4 2+ in the appropriate solution concentration.

Thiosulphate leaching for gold hydrometallurgy

01/10/1995 Adsorption studies were carried out with the actual ammoniacal thiosulphate solution coming from the leaching of the gold ore sample. The gold concentration of the solution was in the range from 2 mg/l to 16.60 mg/1 and the pH was 10.5. Table 2 gives information about the main physico-chemical characteristics of the coconut carbon, used as adsorbant (CECA Italiana, Milan, Italy). The

THIOSULPHATE LEACHING AN ALTERNATIVE TO CYANIDATION

• The thiosulphate leaching of gold ores has great potential to reduce the impact on the environment compared to the cyanidation process. Unlike cyanide, which is highly toxic, the chemicals used in the thiosulphate leaching process are benign, and there is great potential to apply the technology in those jurisdictions of the world where the use of cyanide is banned outright, or is subject

(PDF) Ammoniacal thiosulfate leaching of gold from a

Ammoniacal thiosulfate leaching of gold from a refractory ore using a full factorial design Oktay Celep1, Haci Deveci1, İbrahim Alp1, Ersin Yazici1 Duygu Dinç2 and Celal Duran3 1. Hydromet B&PM Group, Karadeniz Technical University, Turkey 2. Adularya Energy and Electricity Generation and Mining Inc., Turkey 3. Dept. of Chemistry, Karadeniz Technical University, Turkey ABSTRACT Thiosulfate

Conference Proceeding: AMMONIACAL THIOSULPHATE

Cyanide leaching of the ore resulted in a gold extraction of only 22% while gold extractions as high as ~62% were achieved by ammoniacal thiosulphate leaching. The concentrations of thiosulphate (S2O32-) and ammonia (NH3) were identified to be statistically significant factors affecting the extraction of gold, while the effect of addition of copper (Cu2+) is insignificant. This could be linked

Ammoniacal thiosulphate leaching of Ovacik gold ore

DOI link for Ammoniacal thiosulphate leaching of Ovacik gold ore. Ammoniacal thiosulphate leaching of Ovacik gold ore book. By F. Arslan, B. Sayiner. Book Mineral Processing on the Verge of the 21st Century. Click here to navigate to parent product. Edition 1st Edition. First Published 2000. Imprint Routledge. Pages 6. eBook ISBN 9780203747117. ABSTRACT

Ammoniacal thiosulphate leaching of Ovacik gold ore

DOI: 10.1201/9780203747117-90 Corpus ID: 198235766. Ammoniacal thiosulphate leaching of Ovacik gold ore @inproceedings{Arslan2017AmmoniacalTL, title={Ammoniacal thiosulphate leaching of Ovacik gold ore}, author={Fatma Arslan and B. Sayiner}, year={2017} }

Ammoniacal thiosulfate and sodium cyanide leaching of preg

gold leached from the carbonaceous matter to its initial gold content. Ammoniacal thiosulfate leaching of carbonaceous matter from autoclaved Goldstrike ore resulted in 90–100% solubilization of the gold initially present regardless of the preg-robbing behavior of the parent ore. For carbonaceous matters from non-autoclaved ores, ammoniacal thiosulfate leaching only solubilized about 40% of

Treatment of a Polysulphide Ore by Ammoniacal Thiosulfate

That’s why cyanidation and ammoniacal thiosulfate leaching was performed at 33% of solids concentration in order to compare the efficiency of both t echniques. Cyanidation delivered a gold recovery of 80.6% at 2 4 hours of agitation, whereas ammoniacal thiosulfate leaching achieved an 80.9% of gold recovery in only one hour of agitation. Then, the ammoniacal thiosulfate solutions

AMMONIUM THIOSULFATE LEACHING OF AN OXIDE GOLD-COPPER ORE

ln the present work tbe application of ammoniacal thiosulfate leaching to the processing of a Brazilian oxide gold-copper ore rich in cyanide soluble copper was investigated. The main objective was to establish the efiect of the relative concentrations of the maio reagents ammonia, Cu2\ oxygen, and thiosulfate on gold extraction and thiosulfate consumption. The maximum gold extraction

Improvement of thiosulfate stability in gold leaching

Ammonium thiosulfate is a noncyanide lixiviant for gold leaching. However, the major problem with this leaching method has been the high consumption of reagents. To leach a mild-refractory copper-bearing gold ore, the authors used a reagent combination of 0.3M (NH4)2S2O3, 0.03M CuSO4 and 3M NH3 at pH 10.2 for 24 hours. In the testing, thiosulfate consumption was 30 kg/t of ore.

THIOSULPHATE LEACHING AN ALTERNATIVE TO CYANIDATION

• The thiosulphate leaching of gold ores has great potential to reduce the impact on the environment compared to the cyanidation process. Unlike cyanide, which is highly toxic, the chemicals used in the thiosulphate leaching process are benign, and there is great potential to apply the technology in those jurisdictions of the world where the use of cyanide is banned outright, or is subject

ThiosulphateasanAlternativetoCyanideforGoldProcessing

THIOSULPHATE CHEMISTRY Mechanism of gold leaching The oxidation of metallic gold to the aurous Au+ ion in ammoniacal thiosulphate in the presence of Cu(II), can be simply represented as follows, although a more complex mechanism no doubt exists and needs further investigation: Au + 5 S2O3 2-+ Cu(NH 3)4 2+ → Au(S 2O3) 2 3-+ 4 NH 3 + Cu(S2O3)3