A mathematical model of the leaching of gold in cyanide solutions

Real time optimization based on a serial hybrid model for gold cyanidation leaching process

“…Gold leaching by cyanide solution in aerated alkaline pulp has been the main process of extracting gold. In order to improve its performance, the relevant researchers have investigated its chemistry widely (Crundwell and Godorr, 1997 Wadsworth et al, 2000). Most results show that the pure gold cyanidation leaching is an electrochemical process, where gold is oxidized and then synthetized to a stable and dissoluble complex ion ½AuðCNÞ 2 À and at the meantime oxygen reduces and hydrogen peroxide decomposes (De Andrade Lima and Hodouin, 2005;Sun, 2008).…”

“…An electrochemical model based on kinetic model of gold ore cyanide leaching was formulated and fitted (Li et al, 1992;Rubisov et al, 1996;Wadsworth, 1991). An electrochemical mechanistic model based on the shrinking-particle model was presented by Crundwell and Godorr (1997), in which the mathematical model of leaching reactions was used to account for leaching electrochemical mechanisms, gold surface passivation and gold particle shrinkage. Wadsworth et al (2000) proposed a mechanistic model in which the surface reactions were thought to control the gold dissolution rate kinetically.…”

A new plant‐wide optimization method and its application to hydrometallurgy process

“…For further details about the model, interested readers are referred to the model of leaching process proposed by Grundwell and Godor, [24] Hu et al, [25][26][27] Wakeman and Tarleton, [28] and Jiang, [29] the model of filter washing process reported by Andrade and Hodouin, [31] and the model of precipitation process presented by Jia et al [30] (2) Total recovery rate constraint: This is restricted by the lower limit to avoid excessive gold loss, and the following constraint should be satisfied.…”

In situ recovery of gold: Column leaching experiments and reactive transport modeling

“…The inherent complexities of ISL (e.g., no opportunities for direct observations of the process, limited control, time-consuming), as well as the site specific (e.g., geological and geochemical heterogeneities), element-and lixiviant-specific characteristics of ISL/IPL, call for dedicated laboratory experiments and their detailed analysis before ISL/IPL schemes can be implemented at the field-scale. Over the past two decades mathematical models for ISL/IPL-type leaching processes were developed that mainly concentrated on the leaching of gold with cyanide (e.g., Crundwell and Godorr, 1997;Rubisov et al, 1996) and on the leaching of uranium with sulfuric acid (e.g., Macnaughton et al, 2000) or carbonate solutions (e.g., Liddell and Bautista, 1994;Strof et al, 1998). Most studies focused on the modeling of batch experiments, while only a few analyzed data from flow-through column experiments.…”