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Cyanide-free gold leaching in exceptionally mild chloride

2019.10.10  All the industrially applied gold leaching methods (historical chlorine gas based leaching, dominating state-of-the-art cyanide gold leaching, processes at precious metals plants) suffer from the characteristics related to aggressive and even toxic

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Direct Cupric Chloride Leaching of Gold from Refractory

2021.4.13  Gold leaching is also highly dependent on the aggressivity of the leaching conditions. Therefore, direct chloride leaching in two chloride leaching conditions with

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Research on chlorination leaching of pressure-oxidized refractory gold ...

2020.6.1  The chlorination method is one of the ways to leach gold into a soluble gold chlorine complex from an aqueous chloride solution such as sodium chloride. In general,

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Research on chlorination leaching of pressure-oxidized refractory gold ...

2020.6.1  The chlorination leaching of gold, one of the non-cyanide methods, has the advantages of higher reaction rate, less pollution, simple process, and low cost

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氯化法提金工艺技术研究进展

2022.6.25  Gold extraction by chloride is an important cyanide-free gold extraction process, which has been paid more and more attention because of its advantages of high leaching rate and no use of cyanide.

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GOLD LEACHING FROM A REFRACTORY GOLD

2017.8.28  Keywords: Non-cyanide method, gold leaching, refractory gold concentrate Abstract The method of chloride-hypochlorite leaching has the advantages of short

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Gold Leaching from a Refractory Gold Concentrate by the Method

Publish with us. Policies and ethics. The method of chloride-hypochlorite leaching has the advantages of short process, low pollution and higher in reaction rate compared with the

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STIMULATION OF CHEMICAL AND ELECTROCHEMICAL LEACHING OF GOLD

2021.4.1  One of the efficient methods is leaching with aqueous chlorine solutions (hydrochlorination) characterized by high oxidizing and dissolving ability in relation to

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PAPER OPEN ACCESS

2019.9.4  An alternative method of amalgamation to extract gold in small-scale industries was investigated by means of chloride-ion-based solution leaching. In this

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Cleaner process: Efficacy of chlorine in the recycling of gold

2021.3.10  This paper describes the chlorination roasting-water leaching process for the volatilization separation of gold, zinc and simultaneous vanadium recovery from

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DQLGDWLRQ - IOPscience

2022.1.5  Leaching is a process of extracting a soluble constituent from a solid by means of solvent [1]. Leaching processes also are used extensively in the metals processing industries and is a main stage of reactant in gold production [2]. Typically, gold is leached from its ore using an aqueous sodium cyanide solution.

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Leaching and Recovery of Metals SpringerLink

2017.10.13  Leaching processes are classified based on the method used for the leaching of metals, i.e. hydrometallurgy (chemicals) or bio-hydrometallurgy (microbial mediated leaching). Different leaching processes and the leaching of metals from various metal bearing solid wastes are discussed in detail below. 6.3.1 Hydrometallurgical

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The cyanide leaching of gold in solutions containing sulfide

2000.9.1  Gold cyanide leaching is a critical step in the extraction of gold from ore. The desire for a higher leaching rate often leads to increased cyanide concentrations, which pose safety risks and raise the cost of waste treatment. ... CaCl 2 as the best chlorination agent, gold recovery and chlorine removal rates were 85.2% and 95%, ...

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Review of gold extraction from ores - ScienceDirect

1994.10.1  The susceptibility to leaching of pyrrhotite-associated gold in roasted pyrite calcines was studied, with emphasis on the effects of the roasting environment and galvanic contacts under cyanidation conditions. ... Selective extraction of gold (III) from hydrochloric acid–chlorine gas leach solutions of copper anode slime by tri-butyl ...

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金矿非氰化浸金研究进展 - USTB

2020.11.15  At the same time, a film will be formed on the gold surface that hinders the leaching of gold in cyanide and reduces the leaching rate of gold. Gold-containing substances that are insoluble in the cyanide solution include antimony compounds, aurostibite, black bismuth gold ore, and gold-containing compounds formed during

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非氰提金技术研究进展

2018.5.30  摘要：. 随着难处理金矿的占比不断增加以及人们对环保问题的益重视，氰化法受到了技术和环保两方面的制约，非氰方法成为金、银提取的必然趋势。. 非氰方法包括湿法工艺和火法工艺两大类。. 系统介绍了湿法非氰方法中卤素法、硫脲法、硫代硫酸盐

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无氰浸出剂提金研究综述:碱性含硫浸出剂的基本原理、进展 ...

P.L. Breuer and M.I. Jeffrey, An electrochemical study of gold leaching in thiosulfate solutions containing copper and ammonia, Hydrometallurgy, 65 (2002), No. 2-3, p. 145. doi: 10.1016/S0304-386X (02)00086-5. [87] S.C. Zhang and M.J. Nicol, An electrochemical study of the dissolution of gold in thiosulfate solutions.

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A review of environmentally friendly gold lixiviants:

2023.6.1  This is because the strong oxidation of chlorine oxidises the sulfide ore that contains the gold. In addition, the use of chloride leaching of gold can reduce the adsorption of carbon to gold; however, this method is more corrosive to equipment and generates toxic and irritating gases, such as Cl 2 and HCl, in an acidic environment, resulting ...

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Gold Leaching by Sodium Chloride and Calcium Hypochlorite

2018.8.19  Effect of different pH ranges in gold leaching by chloride —hypochlorite solutions ( a) as well as distribution of HClO species as a function of pH. Experimental conditions were 25 g/L of Ca (OCl) 2 and 15 g/L of NaCl, 10% of solids (w/v), −37.0 µm at room temperature. Full size image.

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Optimizing and evaluating the operational factors

2015.12.8  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.

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Use of chloride–hypochlorite leachants to recover gold from

2008.3.28  A mixture of chloride and bromide lixiviants is used to improve the stability of the gold complex. The process also involves the generation of Cu and Fe chloride redox couples at the anode of the cell, which enhance the leaching of sulphide and other refractory minerals in the anode compartment.

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Thiourea Leaching: An Update on a Sustainable Approach for Gold ...

2022.3.18  In order to limit this effect and improve gold leaching efficiencies, the use of an oxidative pre-leaching step to remove copper and other base metals from the sample has been reported [25, 40,41,42, 65, 66]. Birloaga et al. used a pre-leaching stage of 2 M H 2 SO 4 and 20 ml H 2 O 2 (30 wt%) at 30 °C for three hours prior to thiourea leaching ...

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Study of the Technology for Gold Recovery from Gravity

2022.6.13  Gold-containing ore processing technology has been developed by using chemical, X-ray phase, mineralogical, X-ray fluorescence analyses. The results of experiments on the gold recovery from a concentrate with a particle size of 10 and 4 µm are presented, including options for direct cyanidation without preliminary oxygen oxidation,

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A systematic review of gold extraction: Fundamentals

2022.10.15  The most prominent advantage of halide leaching is the high gold dissolution rate. In addition, sulfide components and passivation hardly affect the kinetics of halide leaching. Chlorine leaching was once very popular and was the mainstream process before the 18th century but was later replaced by cyanidation.

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Kinetic Investigation and Dissolution Behavior of Cyanide

2019.5.10  At high chlorine concentrations in solution, the mass transport of chloride ions to the gold surface by diffusion is negligible 2. This is the case for the present system. This is the case for the ...

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Direct Cupric Chloride Leaching of Gold from Refractory

2023.8.19  Reference process, chloride leaching and gold recovery are pre-ceded by sulfide breakdown at elevated temperature and pres-sure (190°C, 100 psi oxygen overpressure (Marsden and House 2005)), countercurrent decantation and neutralization, leaving gold liberated for cupric chloride leaching. Milder conditions

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(PDF) Optimization of process parameters for the selective leaching

2021.6.1  As the leaching of gold is negligible at 25 g/L and 50 g/L, the higher . pulp density of 50 g/L appears to be the optimal parameter for the se-

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Pyrometallurgy Towards Clean Metallurgical Processing

2016.2.13  the leaching of gold in CI-/HOCI system at ambient 9 g/L (i.e. 0.2 M) HCI and the recovew of gold is The chlorine dissolution of gold-bearing was repolted that the dissolution rate of gold in a c: gold in cyanide solution. A recovery of gold more temperature for 6 h (Ximing et al., 1992) This paper describes leaching experimen

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Separation and purification of platinum group metals from

2021.4.1  In the hydrometallurgy process, PGMs are extracted by oxidant-acid leaching systems using reagents such as cyanide, aqua regia, sulfuric acid, hydrogen peroxide or cupric chloride (Ding et al., 2019b; Ding et al., 2019c; Nogueira et al., 2014). ... for recovery of copper and precious metals from waste printed circuit boards with

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Bromine leaching as an alternative method for gold dissolution

2018.3.15  Alternatively bromide can also be added to leaching solutions with chlorine and hypochlorite (as oxidant), converting bromide to bromine (Yannapoulus, 1991), as represented in reactions (5), (6). 2 Br - + Cl 2 - → Br 2 + 2 Cl - 2 Br - + ClO - + 2 H + → Br 2 + Cl - + H 2 O. Probably the best way to leach gold using bromide is preparing an ...

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A review of gold extraction using noncyanide lixiviants

2020.4.14  Alkaline sulfur-containing lixiviants, including thiosulfate, polysulfides, and alkaline sulfide solutions, stand out as a promising class of alternatives to cyanide because of their low toxicity, high efficiency, and strong adaptability. In this paper, we summarized the research progress and remaining challenges in gold extraction using these noncyanide

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Use of chloride–hypochlorite leachants to recover gold from

2008.3.28  1.. IntroductionDue to the growing environmental concern of the use of cyanide for gold processing, interest on the use of non-cyanide lixiviants, especially with halides has been renewed recently (Tran et al., 2001, Ferron et al., 2003, Vinals et al., 1994, Baghalha, 2007).Leachants based on halides (chloride, bromide and iodide) have been

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Metals Free Full-Text Leaching of Gold and Silver from a

2022.7.6  The leaching behaviors of gold and silver from a complex sulfide concentrate in copper-tartrate-thiosulfate solutions were investigated in this paper. Experimental parameters, including temperature, initial pulp pH, and concentration of copper, tartrate, and thiosulfate, were systematically studied. The copper-tartrate

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Solvometallurgical Process for the Recovery of Tungsten

The industrial state-of-the-art processes to extract tungsten from scheelite (CaWO4) require high pressures and temperatures. These flowsheets consume a large excess of chemicals (which are very hard to recycle) and generate up to 25 tons of high-salinity wastewater per ton of ammonium paratungstate product. In this work, a more sustainable conceptual

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Materials Free Full-Text Colorimetric Determination of

2018.9.6  Hypochlorite plays a critical role in killing microorganisms in the water. However, it can also cause cardiovascular diseases, neuron degeneration, and cancer to humans. Although traditional methods feature excellent sensitivity and reliability in detecting hypochlorite, the expensive instruments and strict determination conditions have limited

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Advances in hydrometallurgical approaches for gold

2023.1.1  To stabilize the gold chloride complex (AuCl 4-), gold leaching of fine WPCBs was conducted in the presence of excess chlorine and chloride concentrations at a low pH value and high temperature ... but negligibly consumed chlorate and chitosan for gold leaching. This led to the use of HCl up to 2 M in a WPCBs leaching solution of 1/25 (g

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Kinetic Investigation and Dissolution Behavior of Cyanide

2019.5.10  The leaching experiments with iodine, bromine and aqua regia showed the fastest and continuous gold dissolution over time. A significant influence of temperature on gold leaching was observed in all experiments. Iodine is capable to extract gold a very fast (average dissolution rate of 65.679 mgh −1 cm −2 at 25 °C).

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Possibilities for the Environmental Processing of Gold

2023.6.29  The analysis results show us in Figure 4 that the solid sample content consists of 3.86% antimony, 0.16% arsenic, 10.47% iron, and 1.83% copper, and the gold content is 0.51% in the leached tetrahedrite concentrate. In the following Figure 5 and Figure 6, we can see the graphic process of leaching each metal.

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