Abstract
In this study, a conductivity sensor was designed that allows the vertical water content profile of a two-phase flotation froth to be measured with a minimum vertical measurement resolution of 15 mm. The conductivity sensor consists of 32 ring electrodes, three of which measuring the collection zone gas holdup and 29 measuring the water content in the froth zone at various heights. The sensor was applied to study the water content profile for three increasing average molecular weight polypropylene glycols (PPG 425, PPG 725 and PPG 1000), under various operating conditions (1.0–3.0 cm s−1 input gas velocity and 5–45 ppm frother concentrations). For all conditions, a large increase in a defined degradation function occurred at 70–80% of the froth equilibrium height, indicating a point where small increases in froth height will have large effects on the froth stability.
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