This study investigates the flotation performance of a representative hard coal slime sample (d80 particle size of minus 0.2 mm) obtained from the Prosper-Haniel coal preparation plant located in Bottrop, Germany. Flotation was carried out with a newly designed flotation cell refurbished from an old ultrasonic cleaning bath (2.5 L volume) equipped with a single frequency (35 kHz) and two differ...

This paper will discuss the use of CFD in foam and froth modelling. The physics of froths is introduced and the methodology of combining the models for each phase into a complete description is reviewed. The utility of the CFD model is illustrated in two ways: First the equations are solved explicitly, giving a clear interpretation of process variables and their importance. Second, an example o...

OF DOCTORAL DISSERTATION HELSINKI UNIVERSITY OF TECHNOLOGY P.O. BOX 1000, FI-02015 TKK http://www.tkk.fi Author Name of the dissertation Manuscript submitted Manuscript revised

Flotation processes are difficult to model at a fundamental level and at present automatic monitoring and control of industrial plants have met with limited success. In practice these processes are most often controlled by human operators who tend to assess the performance of the plant based on their own experience and other heuristic rules. As a result plants are usually not controlled optimal...

Froth image analysis has been considered widely in the identification of operational regimes flotation circuits, characterisation froths terms bubble size distributions, froth stability and local velocity patterns, or as a basis for development inferential online sensors chemical species froth. Relatively few studies have unsupervised process monitoring applications. In this study, it is shown ...

– The persistent decay of bubble clusters in coarsening two-dimensional soap froths is measured experimentally as a function of cluster volume fraction. A dramatically stronger decay is observed in comparison to soap froth models and to measurements and calculations of persistence in other systems. The fraction of individual bubbles that contain any persistent area also decays, implying signifi...

Abstract The pinch-off dynamics of bubbles coated with silica particles in deionised water and dodecylamine (DDA) solution, at 0.2 ?M 20.0 ?M, was studied using high-speed photography. Surface pressure generated the deforming particle-laden interface during bubble obtained based on fitting to a model. It observed that these remained almost unchanged low DDA concentration while slowed down signi...