Abstract
A novel experimental technique has been used to measure particle concentration distributions in agitated tanks. This approach consisted in using pyrite (FeS2) particles and a Pt electrode connected to a potentiostat to measure variations in the electrode potential caused by galvanic interactions between FeS2 particles and the Pt electrode. In order to discern collisions between the particles and the Pt electrode from random variations in electrode potential, a time and a frequency domain method of analysis were used. The latter showed no periodicity in the collision rate indicating that the process was stochastic. The presented method is convenient because of its simplicity and it can provide important information regarding the hydrodynamic behaviour of solids in agitated tanks, particularly when non-intrusive techniques are not an option. Finally, the advantages and drawbacks of the technique, and its relevance to hydrometallurgical and other chemical processes are discussed.
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