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·The main phase of curing residue was Fe2 SO4 3 and silica was nearly the only phase after washing At the same time by combining the sodium thiosulfate system gold leaching method the gold leaching rate increased from % to % before and after pretreatment with concentrated sulfuric acid
·The leaching and carbon adsorption kinetic data are fitted to Eqs 2 3 which have been shown in many projects to describe gold leaching and adsorption rates well These equations are then used in CIP and CIL models to predict profiles of gold in solution on the carbon and in the leach residue across a series of leaching and adsorption
·Also cyanide leaching is used to process gold in the Aghdareh mine The main problem in extraction is achieving an acceptable separation of Au from its ore Thus the effects of the main controllable parameters affecting gold recovery are evaluated discussed and optimized In this study an experimental design technique the response surface
The leaching kinetics of gold in a chloride medium is proportionally dependent on the chlorine chloride concentrations A pretreatment of carbonaceous or sulfidic ores is commonly required before undergoing halide leaching to acquire relatively inert ores and less reagent consumption
·The gold heap leaching process involves crushing ores to a certain particle size piling them on a specific site and leaching them with a cyanide solution through spraying or percolation This method extracts metals by allowing the solution to come into contact with the ores It is widely adopted due to its simplicity low cost and
·Thiourea leaching of gold despite first being reported in 1941 [] has never been clearly established into a few industrial applications were reported between 1984 and 1992 [] although more recently Birloaga et al [] report on the development of a pilot plant part of the FENIX project consists of two hydrometallurgical technologies of which
·The gold extraction rate reached % after leaching h under the ultrasonic irradiation In the conventional gold leaching process the gold extraction rate was only % at the same leaching time Obviously the gold extraction was
·For instance Li et al conducted a thiourea leaching process for gold recovery from mobile phone WPCBs using ferric sulfate as an oxidant Jing ying et al 2012 in which optimum results were achieved using 24 g/L thiourea % Fe 3 and g/L pulp density at pH After 2 h of leaching 90 % gold was extracted
·In recent years many alternative agents in the gold leaching process have been developed Thiosulfate is one of the substitutes showing promising results in recent years Aylmore and Muir 2001; Xu et al 2018; Zhang and Nicol 2003; Syed 2012 The leaching of thiosulfate requires oxidant to speed up the leaching process which results in
·Copper gold process flow sheets typically involve the combination of complex flotation circuits combined with subsequent cyanidation leaching for gold recovery Benson et al 2007; Zheng et al 2010; Medina and Anderson 2020 In scenarios where gold is preferentially associated with pyrite methods are required to separate copper minerals
·1 Overview of the Leaching Process The leaching process involves the dissolution of valuable minerals such as gold from the ore matrix using a suitable leaching solution In the case of gold extraction cyanide is commonly used as the leaching agent due to its high efficiency in dissolving gold 2 Mixing and Agitation
·Processing of gold ores with high sulfide minerals is problematic as they consume cyanide and reduce gold leaching Optimization of gold leaching and cyanide consumption requires a methodology to
The Albion Process developed at Core s laboratories in the 1990 s is one such process and is now in use globally see a recent report on a gold Albion Process plant here Other processes for treating refractory ores include Pressure Oxidation POx and Bacterial Leaching BIOX®
·The process is characterized for its economic cost against the agitated leaching process when the ore deposit has a low gold content Typically the process can process ores whose gold content is g/t The leaching solution is spread at the top of the pile and the pregnant solution will have to percolate through the pile
·This study aims to comprehensively investigate the role of glycine GL in gold dissolution with thiosulfate TS utilizing both experimental and density functional theory DFT approaches Three different leaching systems namely AM TS Cu2 GL TS Cu2 and AM GL TS Cu2 were examined and compared using the response surface methodology at
·Thiosulfate leaching has been regarded as a promising alternative to cyanidation but it still faces the challenge of the recovery of low content of gold from high concentrations of thiosulfate solutions Liquid liquid extraction is a method to address this issue but is still limited by the use of volatile and toxic organic solvents To overcome this limitation this work
·1 Introduction Cyanidation has been the primary gold leaching process in the past decades because of its high selectivity towards gold leaching Fleming et al 2003 However there have been serious environmental concerns associated with its use due to the extreme toxicity of cyanide present in the tailings of the gold extraction plants Kyle et al 2012
·In a typical continuous single or multistage leaching process the stream containing the solid phase is called the underflow whilst the solute rich stream is referred to as the overflow stream Equilibrium in a solid liquid stream is established when the concentration of solute in the underflow and overflow streams leaving a stage are equal
·Gold is a highly required material for a wide range of personal and industrial applications The high demand for gold together with the shortage of natural resources and high pollution potential of wastes generated during mining and ore processing activities led to search for alternative sources of gold A possible source is represented by mine wastes resulting from
Printed circuit board PCB is the essential part of electronic devices and has an important source of base and precious metals with high economic potential
·The leaching process of gold from the oxide gold ore may be controlled by product layer diffusion giving an apparent activation energy of kJ/mol 3 Under the experimental conditions the gold extraction increases with increasing the temperature and the copper and thiosulfate concentrations but decreases with increasing the content of
·The governing method for gold ore processing has been cyanide leaching since the late 19th century Marsden and House 2006 After decades of active development of the process for various types of ores and concentrates there are several different hydrometallurgical flowsheets for cyanide leaching
The Chemistry of Gold Extraction is an extensively revised and comprehensively updated edition of the well known reference first published in 1992 It provides the broad base of knowledge that is now required by all those working in the gold extraction and gold processing industries The book bridges the gap between research and industry by emphasizing the practical applications
·Gold cyanidation leaching process GCLP has been prevalent in the hydrometallurgical industry To better control and optimize the plant operation mechanistic models have been established which
