The electrochemical oxidation of gold telluride (AuTe2) in perchloric acid solutions

Jayasekera, S.; Avraamides, J.; Ritchie, I.M.

doi:10.1016/0013-4686(95)00378-9

Cited by 11 publications

(5 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The more cyanide soluble platinum minerals were dissolved in the first 15 days, leaving the less soluble ones behind. Comparisons can be made with gold hydrometallurgy where the refractory nature of certain Au bismuths, tellurides and arsenides to direct cyanide leaching under mild conditions of temperature (up to 60 o C), atmospheric pressure and dilute reagent concentrations (2-5 g/L), is well reported (Adams, 2005;Henley et al, 2001;Climo et al, 2000;Jayasekera et al, 1996). It may be that this process is suffering a similar mineralogical limitation.…”

Section: High Temperature Cyanide Leachmentioning

confidence: 99%

Assessing a two-stage heap leaching process for Platreef flotation concentrate

2012

View full text Add to dashboard Cite

Samples of low-grade flotation concentrate derived from Platreef ore were treated with a two-stage heap leach process to determine the potential to run this process parallel to to the convential concentrate-smelt-refine process for extracting platinum group metals, thereby adding value to the convential process via economic treatment of low-grade materials. Using bench-scale columns, a first stage bioleach achieved extractions of 91.1% Cu, 98.5% Ni and 83.5% Co in a space of 88 days at a temperature of 65°C. Samples of residual concentrate from this process were similarly treated via columns in a second stage leach using cyanide solution, achieving extractions of up to 96.5% Pd, 97.5% Au and 35% Pt in a space of 45 days at 50°C. Mineral liberation analysis of a sample of concentrate from the cyanide leach experiment revealed that the bulk of the remaining Pt was in the form of sperrylite which appeared to leach very slowly in cyanide solution. Further to this, analysis of the cyanide leachate solution showed high levels of thiocyanate

show abstract

Section: High Temperature Cyanide Leachmentioning

confidence: 99%

Assessing a two-stage heap leaching process for Platreef flotation concentrate

2012

View full text Add to dashboard Cite

show abstract

“…When the telluride-type gold concentrate is directly cyanide leached to leaching gold and silver, the gold leaching rate is only 32.00%. After the telluride-type gold concentrate is selectively pre-leached with tellurium, the leaching rate of gold is significantly increased to 75.39%, and the leaching rate of silver also rises to 58.83%, indicating that the hydration film formed by tellurium can interfere with gold and silver leaching, especially gold leaching during the cyanidation process of telluride-type gold mines ( Jayasekera et al, 1996 ; Henley et al, 2001 ; Dyer et al, 2017 ). The selective pre-leaching of tellurium before the cyanide leaching of telluride-type gold concentrate can separate and enrich tellurium and effectively improve the leaching rate of conventional cyanidation of precious metals of this type of ore.…”

Section: Resultsmentioning

confidence: 99%

“…Many studies have shown that telluride-type gold ore is difficult to dissolve in the cyanide solution, resulting in a decrease in the leaching rates of gold and silver. The currently accepted explanation is that the insoluble compound—TeO 2 (or hydrated H 2 TeO 3 phase) was produced during the cyanidation process, and the insoluble compound could lead to a passivation layer formed on the mineral surface, as shown in Eqs 1 , 2 ( Jayasekera et al, 1996 ; Henley et al, 2001 ; Dyer et al, 2017 ).

…”

Section: Introductionmentioning

confidence: 99%

Selective Pre-leaching of Tellurium From Telluride-Type Gold Concentrate

et al. 2021

View full text Add to dashboard Cite

With a telluride-type gold ore flotation concentrate as the research object, the Na2S + NaOH collaborative leaching process was applied to selectively separate tellurium before the cyanide leaching of gold and silver. The effects of process parameters including the type of leaching agent, the amount of leaching agent, liquid-solid ratio, leaching temperature, and leaching time on the leaching rate of tellurium were investigated. The results showed that the tellurium leaching rate could reach 78.14% under the optimum conditions of −0.038 mm (95%) grinding fineness, 80 g/L Na2S concentration, 30 g/L NaOH concentration, 4:1 liquid-solid ratio, 80°C leaching temperature and 3 h′s leaching time. The kinetic analysis showed that the leaching process of tellurium from telluride-type gold concentrate was a mixed type of chemical reaction control and diﬀusion control. The grain parameter in the leaching process was 0.26263 and the apparent activation energy E = 17.12 kJ/mol. Tellurium could be pre-leached from the telluride-type gold flotation concentrate through the Na2S + NaOH alkaline leaching process to achieve the effective separation of tellurium from noble metals, which, when eliminating the adverse effects of telluride on the leaching of gold and silver, provides new ideas for the extraction of rare element tellurium.

show abstract

“…According to the phase diagrams of the Te-Au system, 13 however, it is possible that gold and tellurium form a Te-Au alloy, such as a calaverite, an important source of gold in several areas of the world. 14 Consequently, an ideal single atomic layer formed by the UPD process is not always stable for a long period of time. In a UPD process, atomic diffusion may occur within the near-surface layers.…”

Section: Discussionmentioning

confidence: 99%

Evidence for the Diffusion of Au Atoms into the Te UPD Layer Formed on a Au(111) Substrate

Kawamura

Takahasi

Hojo

et al. 2002

J. Electrochem. Soc.

View full text Add to dashboard Cite

The structure of a Te layer formed on a Au(111) substrate by underpotential deposition (UPD) in an electrolytic solution has been studied using in situ surface X-ray diffraction technique. The measurements were carried out for a series of samples which were kept at UPD potential for 4 to 59 h. The results revealed that the Te UPD layer is unstable. The top layer is analyzed to consist of the UPD Te atoms and Au atoms which diffuse from the Au(111) substrate. Also, the Te UPD layer does not have the structure with periodicity reported in previous works, such as (√3 x √3)R30° after ample time elapses. Stripping voltammetry for the Te UPD layer shows that the interaction between Te and Au increases with time, supporting the finding that the top layer is a mixture of Te and Au

show abstract

The electrochemical oxidation of gold telluride (AuTe2) in perchloric acid solutions

Cited by 11 publications

References 14 publications

Assessing a two-stage heap leaching process for Platreef flotation concentrate

Assessing a two-stage heap leaching process for Platreef flotation concentrate

Selective Pre-leaching of Tellurium From Telluride-Type Gold Concentrate

Evidence for the Diffusion of Au Atoms into the Te UPD Layer Formed on a Au(111) Substrate

Contact Info

Product

Resources

About