

Author: Gomez C. O. Uribe-Salas A. Finch J. A. Huls B. J.
Publisher: Maney Publishing
ISSN: 0008-4433
Source: Canadian Metallurgical Quarterly, Vol.30, Iss.4, 1991-10, pp. : 201-205
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Abstract
Gas holdup in the collection zone of a flotation column is an important operational variable. Two methods of gas holdup determination are from: (1) pressure and (2) conductance measurements. Water-air experiments completed in a pilot column (0.91 m in diameter) show the conductivity probe developed to measure level gives holdup values in good agreement with those determined from pressure, provided the measurements are made at the same location. A basic study of the cell constant of the probe geometry shows that accurate estimation of gas holdup can be expected provided gas holdups are below about 20–30%. The conductivity technique shows promise for gas holdup measurements in industrial columns. In principle the technique is readily extendable to the air-slurry system. Potential practical difficulties are discussed.
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