Evaluation of a diagnostic leaching technique for gold in native gold and gold ± silver tellurides

Henley, K. J.; Clarke, N.; Sauter, P.

doi:10.1016/s0892-6875(00)00156-4

Cited by 26 publications

(8 citation statements)

References 3 publications

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“…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

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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

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Section: High Temperature Cyanide Leachmentioning

confidence: 99%

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

2012

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“…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

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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.

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“…Precious metal tellurides are notoriously refractory phases. [2][3][4][5][6] GOLD-SILVER TELLURIDE DEPOSITS…”

Section: Gold-bearing Mineralsmentioning

confidence: 99%

“…A detailed investigation of the stability of native gold and gold ± silver tellurides (grain size of 20-100 µm) in cyanide solutions showed that 99% of the native gold could be extracted. 4 Henley et al 4 used dilute cyanide (0.1%) at pH = 9.5 for 24 h followed by a second treatment with a stronger cyanide treatment (2%) at pH = 12.5 for 96 h. This two-stage treatment could only recover 17% of the calaverite but 93% of gold-bearing hessite and petzite was extracted. The results of their study reinforced the well-established view that calaverite is very refractory to cyanidation.…”

Section: Golden Milementioning

confidence: 99%

Process mineralogy of gold: Gold from telluride-bearing ores

Spry

Chryssoulis

Ryan³

2004

JOM

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Petrographic and microanalytical studies of gold in gold-silver telluride deposits show that it occurs as "visible gold" extracted by cyanidation, and as visible gold and "invisible gold" that are unamenable to cyanidation. Two gold-bearing tellurides, calaverite and buckhornite, are considerably less amenable to cyanidation in comparison to Au-Ag tellurides. Secondary ion mass spectroscopy and recent developments in dynamic analysis of proton-induced x-ray emission demonstrate that Au occurs as nanoparticles and is structurally bound in As-, Ag-, and Te-rich pyrite and that an antithetic relationship can also exist between Au and As in pyrite.

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Evaluation of a diagnostic leaching technique for gold in native gold and gold ± silver tellurides

Cited by 26 publications

References 3 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

Process mineralogy of gold: Gold from telluride-bearing ores

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