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ªre CGb represents the bulk concentration of the mixture of bromine and bromide (Br2 + 2Br-), and CGs is the concentration of the mixture of bromine and bromide at the gold surface (Br2 + 2Br-). For a diffusion controlling process, CGs =0. In a Stroke’sthe influence of the interface chemical reaction is negligible, further contributing to an assumption that the concentration of reactant B at the interface of solid A is zero. Whereas, a chemical-reaction-controlling process occurs when the concentration profile across the boundary layer is negligible, resulting in an assumption that the concentration of reactant B at the interface of solid A is equal to the bulk concentration of B. Figure 7.8 Schematic diagram of a shrinking spherical particle In this study, bromine and sodium bromide are simultaneously responsible for gold dissolution. Bromine alone is capable of dissolving gold; however, sodium bromide itself is incapable of dissolving gold, thus, a method of creating two independent equations for dissolving gold via bromine and sodium bromide, respectively, was not utilized. Instead, considering bromine and sodium bromide as Br42- , represented as G, was utilized to create the diffusion-controlling kinetic model. Moreover, due to the presence of other metals that may consume bromine and form more bromide ions, the concentration of bromine which iPDF Image | HYDROMETALLURGICAL TREATMENT OF E-SCRAP
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