A statistical model for gangue entrainment into froths in flotation of sulphide ores

Study of chalcopyrite flotation in the presence of illite using a design of experiments approach

“…It may probably be caused by a rise in frother concentration, which diminishes the bubble size and the additional bubble surface area promotes the collection of more hydrophobic particles. The nearly same observation has also been described in the literature (Cilek & Umucu, 2001). Chalcopyrite recovery improved significantly with the increasing amount of clay, whereas chalcopyrite recovery decreased with the increment of froth height between 2-3 cm (Fig.…”

Attachment of solid particles to air bubbles in surfactant-free aqueous solutions

“…The experiments carried out in Technical University of Wrocow (Drzymala, 1999) showed that even ice, amber, potato and carrot could attach to air bubbles in a mono-bubble Hallimond otation tube. The explanations (Drzymala, 1999;van Deventer et al, 2001;C ilek and Umucu, 2001;Savassi et al, 1998) for the accumulation of silicates or vegetable particles in froth products were that particles were entrained in water which passed through the froth, or were physically entrained between hydrophobic particles which had attached to air bubbles. However, this mechanism is not applicable to bubble-particle attachment in surfactant-free aqueous solutions in a Hallimond otation tube containing just a small quantity of hydrophilic particles and one or a few bubbles (Drzymala, 1999).…”

Interactions among the rate parameters of feed constituents in flotation

“…This finding agrees well with the findings of some recently published investigations. 14,15 At low airflow rates, as is expected, an increase in pulp density increases the SI cg and SI gw . This is because a low airflow rate causes an increase in froth retention time Table 1 Summary of main and interaction effects of operating variables on responses significant at 5% and drainage of feed water leading to a low entrainment of fine particles.…”