Treatment of copper-rich gold ore by cyanide leaching, ammonia pretreatment and ammoniacal cyanide leaching

Baş, Ahmet Deniz; Koç, Elif; Yazıcı, Ersin; Deveci, Hacı

doi:10.1016/s1003-6326(15)63642-1

Cited by 56 publications

(22 citation statements)

References 13 publications

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“…As the gold in acid-leaching residue was fully exposed and had high grade of 216.58 g/t, the cyanide consumption per unit weight of gold was as low as 0.185 kg (NaCN)/g(gold). However, for gold ores (e.g., gold grade of 2 g/t), the cyanide consumption usually reaches 0.5-1 kg (NaCN)/g (gold) for the huge amount of ores although the cyanide dosage (1-2 kg/t) is much lower than that in this work (Table 3) [46]. Thus, it was worthwhile noting that the cyanide consumption in this process was much lower than that in gold extraction industries.…”

Section: Recovery Of Gold From Acid-leaching Residuecontrasting

confidence: 53%

Recovery of Gold and Iron from Cyanide Tailings with a Combined Direct Reduction Roasting and Leaching Process

Feng

et al. 2018

Metals

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Cyanide tailings are the hazardous waste discharged after gold cyanidation leaching. The recovery of gold and iron from cyanide tailings was investigated with a combined direct reduction roasting and leaching process. The effects of reduction temperature, coal dosage and CaO dosage on gold enrichment into Au-Fe alloy (FexAu1−x) were studied in direct reduction roasting. Gold containing iron powders, i.e., Au-Fe alloy, had the gold grade of 8.23 g/t with a recovery of 97.46%. After separating gold and iron in iron powders with sulfuric acid leaching, ferrous sulfate in the leachate was crystallized to prepare FeSO4·7H2O with a yield of 222.42% to cyanide tailings. Gold enriched in acid-leaching residue with gold grade of 216.58 g/t was extracted into pregnant solution. The total gold recovery of the whole process reached as high as 94.23%. The tailings generated in the magnetic separation of roasted products, with a yield of 51.33% to cyanide tailings, had no toxic cyanide any more. The gold enrichment behaviors indicated that higher reduction temperature and larger dosage of coal and CaO could promote the allocation of more gold in iron phase rather than in slag phase. The mechanism for enriching gold from cyanide tailings into iron phase was proposed. This work provided a novel route to simultaneously recover gold and iron from cyanide tailings.

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Section: Recovery Of Gold From Acid-leaching Residuecontrasting

confidence: 53%

Recovery of Gold and Iron from Cyanide Tailings with a Combined Direct Reduction Roasting and Leaching Process

Feng

et al. 2018

Metals

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“…Ammoniacal lixiviant has been utilized for Cu removal from Cu-rich gold ore [21] using the specific complexation reaction between Cu and NH 3 [22]. Therefore, the EDTA-NaOH solution (as optimized in the previous section) was dosed with NH 3 with a concentration ranging from 0.1 to 1.0 mol L -1 to facilitate the enhanced removal of elements from WFS.…”

Section: Effect Of Ammonia-assisted Washingmentioning

confidence: 99%

Decontamination of metal-contaminated waste foundry sands using an EDTA–NaOH–NH3 washing solution

Sawai

Rahman

Fujita

et al. 2016

Chemical Engineering Journal

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Waste foundry sand (WFS), which is a hazardous byproduct from the foundry industry, is often contaminated with potentially toxic elements (PTEs), such as Cu, Pb and Zn, and widely re-utilized as a construction material. Therefore, the depollution of WFS has been suggested due to its environment friendly reprocessing to avoid potential long-term hazardous impacts. In the current study, a unique chemically induced technique has been proposed for the removal of PTEs from WFS. EDTA, NaOH and NH 3 were used as extractants in combination or in succession. The optimum removal of PTEs was accomplished using a solid (WFS) to solution (50 mmol L-1 EDTA) ratio of 10 under strongly basic pH conditions, which was achieved with NaOH addition. The washing efficiency was further enhanced with the addition of NH 3 to the solution. The complete process cycle duration was adjusted to 9 h with a washing sequence that was repeated three times for 3 h each. The ultimate efficiencies (%) for the removal of PTEs were as follows: Cu, 98; Pb, 81; Sn, 83; and Zn, 50. The leaching of residual PTEs (%) from the decontaminated WFS was also in compliance with the regulatory levels that are defined by the monitoring authorities.

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“…(5)) and the diffusioncontrolled (Eq. (6)) processes of the shrinking core model (Liu et al 2014;Das et al 2015). The suitability of the shrinking core model emanates from the fact that it relates the conversion fraction (X) of the ore solid particle to the reaction rate constant (K) and reaction time (t) (Liu et al 2014;Das et al 2015).…”

Section: Kinetics Of Iron Dissolution From Akwuke Orementioning

confidence: 99%

Effects of alkali solution on the dissolution kinetics and optimization processes of iron from Akwuke ore

Ani

Chukelu

2020

Bull Natl Res Cent

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Background The dissolution process kinetics and optimization of iron from Akwuke ore were investigated in this study. The effects of process parameters such as agitation rate and ore particle size on the dissolution process were also examined. The Akwuke ore was characterized employing the XRD, FT-IR, SEM, and UV-spectroscopy. Results The results from the rate constants indicated that the diffusion through the boundary layer process with R2 > 0.96 was the rate-determining mechanism. The maximum iron dissolution rate of 83.2% was obtained at 45-μm particle size while 81.2% and 72.6% iron dissolution rates were obtained at 490 and 390 rpm agitation rates, respectively. Silicon oxide, aluminum oxide, and iron oxide were present in Akwuke ore as indicated from the XRD analysis. The RSM predicted optimum value of the iron dissolution rate from the numerical optimization was experimentally validated to confirm the satisfactory performance of the quadratic model. Conclusion This study concludes and presents the potential extraction of iron from Akwuke ore, which will be of immense benefit in hydrometallurgical process.

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Treatment of copper-rich gold ore by cyanide leaching, ammonia pretreatment and ammoniacal cyanide leaching

Cited by 56 publications

References 13 publications

Recovery of Gold and Iron from Cyanide Tailings with a Combined Direct Reduction Roasting and Leaching Process

Recovery of Gold and Iron from Cyanide Tailings with a Combined Direct Reduction Roasting and Leaching Process

Decontamination of metal-contaminated waste foundry sands using an EDTA–NaOH–NH3 washing solution

Effects of alkali solution on the dissolution kinetics and optimization processes of iron from Akwuke ore

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