Thiosulfate is the most promising non-cyanide leaching reagent and the only reagent which found industrial application on gold recovery from a highly carbonaceous preg-robbing gold ore at Barrick ...
While the Merrill–Crowe process and gold complex adsorption onto activated carbon represent historical cornerstones, their inherent limitations have prompted the emergence of more recent …
How to cite: Valdivieso-Bermeo, P, Peñaloza, I. and Moreno-Chávez, J, Treatment for gold ores with high content of carbonaceous matter. DYNA, 87(215), pp. 180-185 ...
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 …
With the depletion of high-quality ore, the extraction of gold from refractory gold ores/concentrates is a promising endeavor. Pyrite is an important gold-bearing sulfide mineral. It is of great significance to study its influence on gold leaching to realize the maximum utilization of refractory sulfide gold ores/concentrates.
In the cyanide leaching tests, those performed at a high cyanide level (i.e., 5 g/L) produced high gold and silver extractions from the roasted ore apparently due to the increased availability of cyanide for gold leaching. Adsorption tests (CIL/CIP, RIL/RIP) were performed to investigate the selective recovery of gold and silver from copper ...
The extraction of gold from refractory gold ores (RGOs) without side reactions is an extremely promising endeavor. However, most RGOs contain large amounts of sulfide, such as pyrite. Thus, investigation of the influence of sulfide on the gold leaching process is important to maximize the utilization of RGOs. In this work, the effects of …
The recovery of gold by adsorption using activated carbon from sodium cyanide and thiourea leached solutions are reported in this study. The leached solutions were obtained under real operating conditions from the beneficiation plant "Paz Borja", Machala-Ecuador. Calgon Carbon DG-11 6X12 type, widely used in the local …
The use of CaS 2 O 3 salt instead of Na 2 S 2 O 3 or (NH 4) 2 S 2 O 3 salt in the leach has beneficial effects on gold extraction, where calcium appears to prevent the formation of thiosulfate degradation products on the gold surface and assists in the maintenance of a constant and high leach rate during prolonged leaching (Feng and …
leaching of gold ores with dilute cyanide solutions and the recovery of gold and associated silver from the pregnant effluents by a carbon adsorption- desorption method.
The leaching solution was obtained from 150 CPUs and the gold concentration was 755.9 ppm, and then JNM-100-AO (250 mg) was added to extract gold, followed by the desorption, reduction and ...
ADSORPTION TECHNOLOGIES FOR GOLD-COPPER ORES * J.J. Eksteen1, ... cyanide to leach gold-copper ores at leach rates higher than either glycine or cyanide on their own, while ... high solubility in ...
Thiosulfate leaching is a promising alternative to cyanidation, and the main hindrances for its wide commercial application are the high thiosulfate consumption and the difficult recovery of dissolved gold. In this review, the four solutions to reduce the consumption of thiosulfate, including the control of reaction conditions, the use of …
Thiourea leaching of gold, despite first being reported in 1941 [], has never been clearly established into industry.Only a few industrial applications were reported between 1984 and 1992 [] although more recently, Birloaga et al.[] report on the development of a pilot plant.The plant, part of the FENIX project, consists of two …
Firstly, 0.001, 0.005, 0.02, 0.07, and 0.1 g TSC were added into five 100 mL 50 mg/L Au(S 2 O 3) 2 3− solutions, then activated carbon without modification were put into the attained mixture containing gold and TSC to conduct gold adsorption experiment. The gold concentration was then analyzed at 2, 4, 8, 12, and 24 h, and the results are presented …
The result showed that the growth supernatant of M. caseolyticus and A. calcoaceticus might be more suitable to leaching gold from ore than leaching by microorganisms (in the presence of microorganisms) directly, and confirmed that amino acids/peptides/proteins produced by micro organisms might be involved in gold …
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 …
1. Introduction. Since the late 19th century, cyanidation has been used for gold leaching from ores or concentrates because of its simple process and mature technology [1].However, there are some drawbacks to cyanidation, such as long leaching time and easy interference by nonferrous metals [3].More seriously, the cyanide used is …
Cyanidation, a conventional process to extract gold from gold ores, has been used for over 130 years in industrial mining because of the high efficiency and rate of formation of Au(CN) 2 − and the high recovery efficiency by adsorption of Au(CN) 2 − on activated carbon. However, carbonaceous refractory gold ores are not targeted …
This review is devoted to an integrated evaluation of the current use and future development of the resin adsorption technique in gold recovery from pregnant thiosulfate solutions. Comparisons are firstly made with …
Gold production in South Africa is projected to continue its decline in future, and prospects for discovery of new high-grade deposits are limited. Many of the mining companies have resorted to mining and processing low-grade and complex gold ores. Such ores are technically challenging to process, which results in low recovery rates, …
PROCESSING GOLD ORES USING HEAP LEACH-CARBON ADSORPTION hiETHODS by H. J. Heinen,' D. G. Peterson,' and R. E. Lindstrom2 ABSTRACT This Bureau of Mines report reviews the recent developments in the heap leaching of gold ores with dilute cyanide solutions and the recovery of gold
Leaching, often gold, is the process of extracting a soluble constituent from a solid by means of a solvent. In extractive metallurgy, of gold, it is the process of dissolving a certain mineral (or minerals) from an ore or a concentrate, or dissolving certain constituents from materials such as a calcines, mattes, scrap alloys, anodic slimes, ...
The effects of solids density on yield stress and the rate of adsorption of gold cyanide on carbon for a Canadian gold ore. Model-predicted variations in CIP plant performance as a function of ...
Overview of the main processes in the extraction of gold from raw materials. The aim of this paper is to present a systematic review of the mineral processing of …
This review is devoted to an integrated evaluation of the current use and future development of the resin adsorption technique in gold recovery from pregnant thiosulfate solutions. Comparisons are firstly made with other recovery techniques, including precipitation, activated carbon adsorption, solvent extraction, electrowinning and …
Thiourea leaching of gold from a quartz vein type ore without the addition of additive was investigated to show the effect of leaching conditions including Fe 3+ concentration (0.02–0.05 M), thiourea concentration (0.05–0.13 M), pH (1.0–2.5), leaching time (4–7 h) and temperature (25–50 °C) on gold extraction and thiourea consumption. . …
The impact of experimental variables, including pH, agitation rate, amount of adsorbent and adsorption time in the gold adsorption from cyanide leaching solution on activated carbon was studied. A response surface method using a central composite design was applied to evaluate, model and optimize the influential factors.
To obtain a high gold leaching percentage, two-stage leaching was adopted, i.e., the first stage barren solution was used for gold leaching of the first stage leaching residue after the concentrations of Cu(Ⅱ), NH 3 and S 2 O 3 2– were adjusted to their initial levels by replenishing the reagents. Also, the copper desorption solution and ...
The goal of leaching is to 'push the reaction to the right' ie; consume the reactants to produce the gold complex in solution. Therefore to leach the gold out of the ore and …
This research was carried out on Aghdareh gold ore. The Aghdareh mine and gold processing plant is located 32 km from Takab city in the western Azerbaijan province, Iran, at 46°58′30′′N and 36°39′29′′E. The grade of gold ore is 3 ppm. Also, cyanide leaching is used to process gold in the Aghdareh mine . The main problem in ...
CIL circuit is a process of continuous leaching of gold from ore to liquid and counter-current adsorption of gold from liquid to carbon particles in a series of tanks. The CIL process concentrates gold from 2.5–3.5 g/t in ore to 2000 to 6000 g/t on carbon. Although the earliest process was in South Africa in 1890, CIP/CIL was first introduced ...
A gold ore sample originated from an epithermal deposit with a composition shown in Table 2 was used as a feed material in the leaching experiments. X-ray fluorescence and inductively coupled plasma optical emission spectrometry (ICP-OES; Thermo Scientific iCAP 6000, USA) were used to determine the chemical composition of …
