|About this Abstract
||Part C-1: Hydrometallurgy 2018
||Study of the Diffusion of Cu(II) as an Oxidant Through Simulated Particle Pores in a Novel Model Apparatus
||Buhle Manana, Jochen Petersen, Rahul Ram
|On-Site Speaker (Planned)
In heap leaching, the oxidative dissolution of minerals embedded deep within large particles cannot be understood on the basis of the solution conditions on the particle surface. In the present study the diffusion of the oxidising species through inner particle pores is simulated in a model apparatus that separates a platinum electrode under controlled reduction potential from the bulk solution through narrow pores of varying length. The Cu-NH3 system was chosen as a model system, and Cu2+/Cu+ as the redox couple of interest. Platinum wires inserted in the pores allowed the measurement of varying redox potentials along the pore length. Results showed that there exists a narrow (0.5mm) zone near the reduction surface that is depleted of the oxidant, and in which its supply to the surface is strongly diffusion limited, even if it is in abundance in the bulk solution and most of the length of the pore.
||Planned: At-meeting proceedings