The paper presents an overview of bio-oxidation of sulphidic refractory gold ores prior to gold cyanidation. This review discusses several factors, more importantly, oxygen requirements and oxygen ...

Therefore, the purpose of the study was to determine the oxidative leaching kinetics of the sulphidic gold tailings with the acidic ionic liquid [Bmim + HSO 4 −] to estimate its suitability and potential to extract gold compared to conventional cyanidation.

In the case of gold, the cyanide anion (CN-) forms a soluble complex with gold (I) (i.e. Au (CN)-2), that is so stable that molecular oxygen becomes a viable oxidant. The process is known as gold cyanidation, and it has—unsurprisingly—been studied extensively for the past century. The model studies the oxidative dissolution of this noble ...

Several authors have published their results from gold extraction via oxidative pretreatment following the cyanidation process [14,19,20,21]. In our study, we evaluate the effect of the simultaneous …

Most gold deposits occur associated with sulphides like pyrite and arsenopyrite; thus, precious metal dissolution is possible by oxidizing auriferous sulfide concentrate using simultaneous pressure …

Cyanidation is the main process in gold leaching. There are several parameters that affect gold recovery and cyanide consumption. In this paper, the effect of the oxidative pretreatment and lead nitrate addition on the cyanidation of Zarshuran refractory gold ore containing 3.32 ppm Au, 1.09% As, and 0.5% sulfur were …

The oxidative leaching of gold is the key step in gold metallurgy. Cyanidation has been the most viable technology and dominant means in the industry …

Gold lixiviants; 1: Thiosulfate: 8: Oxidative chloride processes: a: Cu ... Gold leaching rate is fast, and the leaching usually finishes in 4–6 h. There are few interfering ions. Thiourea leaching has a good adaptability for various gold ores and are suitable to treat silver-rich gold ores, complex ores that are pretreated by bio-oxidation ...

oxidation of gold at the anode and reduction of oxygen at the cathode [27,28]. In fact, the reaction is very sluggish without the presence of Cu(II) and ammonia, and the speed of …

Oxidative leaching of refractory sulphidic gold tailings with an ionic liquid @article{Teimouri2020OxidativeLO, title={Oxidative leaching of refractory sulphidic gold tailings with an ionic liquid}, author={S. Teimouri and Johannes Herman Potgieter and Geoffrey S. Simate and Lizelle van Dyk and Marek Dworzanowski}, journal={Minerals …

Oxygen input by air bubbling and a longer contact time enhanced the oxidative ammonia pre-treatment process and hence accelerated subsequent thiosulphate leaching of the sulphide ore. Gold ...

The gold leaching reaction by thiosulfate without additives is shown in Eq. (4). (4) 4Au + 8S 2 O 3 2-+ O 2 ... (Oraby et al., 2020) have been developed to enhance the leaching kinetics, while the undesired oxidative decomposition of glycine occurs. Therefore, in-situ leaching could be more compatible with glycine, as confirmed by …

1. Introduction. The oxidative leaching of gold is the key step in gold metallurgy. Cyanidation has been the most viable technology and dominant means in the industry for the last 100 years [1, 2, 3].However, cyanide is lethal to humans since it causes tissue hypoxia and asphyxiation [].Poisoning symptoms will appear within a few seconds …

The leaching of gold, silver and base metals from a sulfidic gold ore in the presence of an oxidant (peroxomonosulfate (HSO5−) or iron(III)) and leaching agent (thiourea, chloride, bromide or ...

Results showed that after 30 min leaching, of gold was extracted from a 45 min-milled sample while only 37.2% of gold was obtained from the un-milled sample after 480 min leaching (at 25 °C ...

In this research, a direct alkaline leaching method and an oxidative roasting-alkali leaching process are applied to recover tellurium from cyanide-leached gold tailings from the Xiaoqinling area and the tellurium phase analysis conducted on the leached alkaline leach residue to investigate the differences caused by the two methods …

This paper deals with the recovery of gold from waste printed circuit boards (WPCBs) ash by high-pressure oxidative leaching (HPOL) pre-treatment and iodide leaching followed by reduction …

Application of 1-alkyl-3-methyl-imidazolium ionic liquids in the oxidative leaching of sulphidic copper, gold and silver ores. J. A. Whitehead Jie Zhang N. Pereira A. McCluskey G. Lawrance. Chemistry. 2007; 128. Save. Oxidative leaching of refractory sulphidic gold tailings with an ionic liquid.

The chemicals used in leaching gold ore can harm human health and seriously pollute the environment ... Silva, L. A., & Zavaleta, N. E. (2021). Treatment of a carbonaceous gold ore by oxidative leaching-roasting and direct roasting. Proceedings of the LACCEI International Multi-Conference for Engineering, Education and Technology. …

the Oxidative Leaching of Gold Nanorods Yurong Ma 1,2, *, Yingyi Zhu 1, Benzhi Liu 1, Guixiang Quan 1 and Liqiang Cui 1 1 School of Environmental Science and Engineering, Yancheng Istitute of ...

A pre-treatment process with oxidative ammoniacal solution enhanced the thiosulphate leaching of the sulphide ore, while the thiosulphate consumption was substantially reduced. The sulphide minerals partially decomposed in the pre-treatment process, exposing gold to the leach solution. Oxygen input by air bubbling and a longer …

The plant, part of the FENIX project, consists of two hydrometallurgical technologies of which, GOLD REC 1, includes an oxidative base metal leaching method combined with thiourea leaching for gold and silver . Despite this limited industrial use, thiourea as a leaching reagent has successfully bridged the transition from primary …

The oxidative leaching reaction of gold from AuNRs is inclined to occur at acidic conditions, it is assumed that the addition of HCl would accelerate the reaction rate. Therefore, the effect of HCl dosage on the colorimetric sensor is studied by adding different concentrations of HCl in Figure 6 and Table 2. The data suggested that the ...

Download Citation | On Jul 1, 2023, Qihao Gui and others published Oxidative pretreatment of refractory gold ore using persulfate under ultrasound for efficient leaching of gold by a novel eco ...

The oxidative leaching reaction of gold from AuNRs is inclined to occur at acidic conditions, it is assumed that the addition of HCl would accelerate the reaction rate. Therefore, the effect of HCl dosage on the colorimetric sensor is studied by adding different concentrations of HCl in Figure 6 and Table 2 .

This produces cyanide during the oxidative decarboxylation of glycine that and subsequently used to dissolve gold. ... Cyanide is the most studied reagent. Bioleaching, an alternative to gold leaching, is a subject that has also attracted considerable scholarly attention, followed by thiosulfate, thiourea and chloride. …

The leaching behavior of gold from an oxide gold ore using copper–tartrate–thiosulfate solutions has been investigated. Experimental parameters, including temperature, initial pH, and concentrations of copper tartrate and thiosulfate, were systematically studied. The capability of gold leaching using copper–tartrate–thiosulfate …

Hypochlorite leaching system is a strong oxidizing solution for metal sulfides, which are naturally associated with gold extraction. This study evaluated the …

The maximum gold recovery of 96.1% was obtained with the normal cyanidation process after 22 h whilst only 75 min was required with the Jetleach reactor to reach the same recovery. After 120 min with the Jetleach reactor, the gold recovery shows a further improvement of almost 2% and reaches a maximum of 98%.

The application of pressure oxidation (POX) followed by thiosulfate gold leaching is an efficient method used to extract gold from double refractory gold ores containing both sulfide and carbonaceous matter. This process is expected to result in high gold recovery rates, as it liberates gold from sulfides and eliminates the preg-robbing …