|About this Abstract
||Part C-1: Hydrometallurgy 2018
||Measuring Potential in a Pressure Oxidation Autoclave: The Development of a Robust In-situ Oxidation/Reduction Potential Sensor
||Jing Liu, Edouard Asselin
|On-Site Speaker (Planned)
Pressure Oxidation (POX) leaching is typically operated at high oxygen partial pressures and high temperatures in an autoclave. The conditions prevalent in the autoclave are critical to the success of downstream processing and ultimate gold recovery. POX is usually controlled by parameters including particle size, pressure, temperature, density and pH of the slurry. All of these parameters together provide an oxidative condition, which is quantified by the oxidation/reduction potential (ORP) of the slurry. This work focused on developing a novel and robust Quasi Reference Electrodes (QRE) to measure the in-situ ORP of POX processes. It is confirmed that there is a one-to-one relationship exists between the ORP and R values. R is the ratio of anodic and cathodic characterization currents when an overpotential is imposed on the working electrode vs. the reference electrode through potentiodynamic polarization. It also resulted in proof of concept: the pre-calibrated ORP sensor and measurement system we developed works under a wide variety of POX conditions.
||Planned: At-meeting proceedings