Développement d'un capteur de taux de rétention d'air pour une colonne de flottation

Authors: Verret, François-Olivier
Advisor: Del Villar, RenéDuchesne, Carl
Abstract: This work presents the design of different gas hold-up (εg) sensors with a laboratory flotation column. These sensors are compared to existing gas hold-up measurement methodologies for the automatic control of a flotation column with an internal diameter of 2 1/4” and a 7 meters length. For the purpose of design validation, the following parameters were tested: liquid conductivity, air flow, percent solids and frother addition. Two methods were tested: the modified standard addition and the modified syphon cell (McGill). These methods were validated with the isolation of a column section. The modified syphon cell gives good results on a large range of gas hold-ups. The problematic calibration of the modified standard addition method results in a less accurate hold-up measurement. In general, a combination of high volumetric fraction of standard (~60%) with a low gas hold-up give good results. An elevated high gas hold-up causes turbulence in the sensor. The standard addition standard method (εstd = 45%) gave unreliable results due to a lack of sensitivity to conductivity changes. A summary of the research relating to the surface bubble area flux and the bubble diameter is also presented in this master thesis. A bubble viewer prototype for a column flotation was designed based on the McGill bubble viewer.
Document Type: Mémoire de maîtrise
Issue Date: 2006
Open Access Date: 12 April 2018
Permalink: http://hdl.handle.net/20.500.11794/18675
Grantor: Université Laval
Collection:Thèses et mémoires

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