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A gold leaching model, based on the wellknown shrinkingcore model, is presented in this work. It is proposed that the reaction takes place at the reacting particle surface which is continuously reduced as the reaction proceeds. The model parameters are estimated .
Cyanide is a lixiviant, or reagent that is used to leach, often in tanks, gold from a solid matrix and form a gold cyanide complex. The gold cyanide complex is then extracted from the pulp or slurry by adsorption onto activated carbon. CIL stands for carboninleach. This is a gold extraction process called cyanidation where carbon is added to ...
minerals Article Predicting Cyanide Consumption in Gold Leaching: A Kinetic and Thermodynamic Modeling Approach Yaser Kianinia 1, Mohammad Reza Khalesi 1,*, Mahmoud Abdollahy 1, Glenn Hefter 2, Gamini Senanayake 2, Lubomir Hnedkovsky 2, Ahmad Khodadadi Darban 1 and Marjan Shahbazi 3 1 Department of Mining Engineering, Tarbiat Modares University, Tehran, ;
Oct 01, 2005· Rubisov et al. (1996) using data from gold ore cyanidation (Ling et al., 1996) fit a model for pure gold cyanidation based on Eq. (3) and the electrochemical model proposed by Wadsworth (1991) and Li et al. (1992) ; the authors suggested a three and a four parameter models .
Gold cyanidation (also known as the cyanide process or the MacArthurForrest process) is a hydrometallurgical technique for extracting gold from lowgrade ore by converting the gold to a watersoluble coordination is the most commonly used leaching process for gold extraction.. Production of reagents for mineral processing to recover gold, copper, zinc and silver represents ...
the effect of copper cyanide on gold leaching from oxide and sulphide ores 110 summary 114 chapters pregrobbing phenomena in the cyanidation of gold ores 116 objectives of this chapter 116 background information 116 pregrobbing behaviour by the ores at low cyanide .
Jul 01, 2017· These types of gold sulphidic ores may be pretreated prior to cyanidation by means of an oxidation step, converting the sulphides into oxides or sulphates. This treatment leads to a reduction in the consumption of dissolved oxygen and of cyanide in the cyanidation step and to an improvement in the metallurgical recovery.
The gold is mixed with the sodium cyanide which leads to the following Elsener''s equation and reaction. This is done to make soluble gold; Now the gold is soluble. This method of making soluble gold is known as leaching. In the process of leaching, a dilute form of sodium cyanide is added into the ore containing the gold.
Modeling of the carbon in pulp (CIP) process in gold cyanide leaching plants. 845 In Eq. 10 k 1 is rate constant for gold adsorption and k 2 is defined as rate constant for gold desorption. Thus, this model takes into account existence of both adsorption and desorption phenomena at the same time. K is the equilibrium constant. Material and method
(HSC). Cynide (NaCN) has been used to recover gold from gold bearing ores since 1890''s and until today it still playing an important role in the beneficiation process of the goldThis work aims to . develop a simulation process model of this solidliquid leaching process by using cyanide solvent for the dissolution of gold by using HSC simulator.
A gold leaching model, based on the wellknown shrinkingcore model, is presented in this work. It is proposed that the reaction takes place at the reacting particle surface which is continuously reduced as the reaction proceeds. The model parameters are estimated .
a gold dissolution model based on an electrochemical mechanism as well as cyanide and oxygen diffusivities through a boundary layer. Rubisov et applied that diffusion model to pure gold by adding a stoichiometric factor representing the number of leached gold moles per mole of consumed oxygen. Crundwell and Godorr10
Gold recovery and reagent consumptions (lime, cyanide, thiourea, ferric sulfate, and sulfuric acid) were measured under different leaching conditions. The results showed that cyanidation method was efficient with % gold recovery with following conditions: d 80 = 63 µm, pH, cyanide consumption of kg/t, and 12 h cyanidation time.
A response surface method using a central composite design was employed to evaluate, model and optimize the influence of five main factors in the gold cyanidation process. These factors were pH, solid percentage, NaCN concentration, particle size and leaching time.
kinetic reaction rates of gold cyanidation leaching process is provided. The rest of this paper is organized as follows. Section 2 introduces the gold cyanidation leaching process under investigation and gives the mechanism model in detail, which is used to simulate the real gold cyanidation .
The mill processes a freemilling gold ore utilizing a gravity recovery circuit and conventional cyanide leach/carboninpulp circuits. Plant slurry temperature cycles seasonally and allows for a unique opportunity to measure the impact that temperature has on gold leach kinetics, carbon adsorption efficiency and cyanide destruction reactions.
Oct 20, 2014· Nature of Gold: The surface of a gold particle will typically be dissolved at a rate of around µm of surface depth per hour in a cyanide leach. For large gold particles and nuggets, this is too slow to be fully dissolved in a typical processing plant. Much simpler and less expensive gravity methods are available to recover this gold.
The model equations were then individually optimized by using quadratic programming to maximize both gold and silver recoveries within the experimental range. The optimum conditions were found to be min for grinding time, ppm for cyanide concentration, and pH, for achieving the maximum gold recovery (%).
De Andrade Lima, L.; Hodouin, D. A lumped kinetic model for gold ore cyanidation. Hydrometallurgy 2005, 79, 121–137. [Google Scholar] Adams, M. The chemical behaviour of cyanide in the extraction of gold. 1. Kinetics of cyanide loss in the presence and absence of activated carbon. J. S. Afr. Inst. Min. Metall. 1990, 90, 37–44. [Google Scholar]
The effect of leaching parameters on gold gold cyanidation is studied in this work in order to optimize the leaching process. A gold leaching model, based on the wellknown shrinkingcore model, is presented in this work.
An improved rate equation for cyanidation of a gold ore. Although cyanide and oxygen are the key reagents in conventional gold cyanidation, previous kinetic investigations of gold dissolution from ores have grouped... Get price; A mathematical model of the leaching of gold in cyanide solutions
A lumped kinetic model for gold ore cyanidation The effect of particle size on the kinetics of gold cyanidation to carry out the gold leaching and cyanide Published in: Hydrometallurgy 183 2005Authors: L R P De Andrade Lima 183 Daniel HodouinAffiliation: Laval UniversityAbout: Least squares 183 Particle size 183 Gold cyanidation 183 Design of ...
The schematic diagram of the mechanism model for gold cyanidation leaching process is illustrated in Figure 2. Q s and Q l are the solid and liquid flow rates, respectively, and have the relationship of Q l = Q s (1/C w – 1) with the parameter C w as the weight concentration of solid in the pulp. Q CN is the flow rate of cyanide added into ...
The effects of cyanidation conditions on gold dissolution were studied by artificial neural network (ANN) modeling. Eightyfive datasets were used to estimate the gold dissolution. Six input parameters, time, solid percentage, P80 of particle, NaCN content in cyanide media, temperature of solution and pH value were used. For selecting the best model, the outputs of models were compared with ...
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