Industrial testing of a gas holdup sensor for flotation systems

The role of gas holdup in flotation has long been discussed but never demonstrated, arguably because a reliable measurement technique has not been available. Work was initiated to develop a gas holdup sensor for industrial operations based on the use of two so-called flow cells for measuring the con...

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Bibliographic Details
Published in:Minerals engineering 2003-06, Vol.16 (6), p.493-501
Main Authors: Gomez, C.O., Cortés-López, F., Finch, J.A.
Format: Article
Language:English
Subjects:
Applied sciences
Conductivity
Exact sciences and technology
Flotation
Gas holdup
Hydrometallurgy
Measurement
Metals. Metallurgy
Production of metals
Production of non ferrous metals. Process materials
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Summary:The role of gas holdup in flotation has long been discussed but never demonstrated, arguably because a reliable measurement technique has not been available. Work was initiated to develop a gas holdup sensor for industrial operations based on the use of two so-called flow cells for measuring the conductivity of the pulp with and without air. These are the measurements required to estimate gas holdup using Maxwell’s equation that relates conductivity to concentration of a dispersed non-conducting phase (i.e., bubbles) in a continuous liquid phase (pulp in this case). After a series of prototypes a unit robust enough for industrial use that continuously measures and delivers signals easily integrated into a plant PLC system has been developed. This communication describes the working principle along with some construction details. The experience of plant tests, ranging from paper to mineral pulps, and mechanical cells to columns, is reviewed.
ISSN:0892-6875
1872-9444
DOI:10.1016/S0892-6875(03)00083-9