Abstract
From the maximal extrapolated film pressure Π max, values of n-octane and n-propanol on bare surfaces and those precovered with tetradecylamine hydrochloride (TDACl) of various minerals (barite, fluorite, marble and quartz) the dispersion and polar free surface energy values were calculated and discussed. From these values the work of water adhesion to a mineral surface was calculated, and then correlated with flotability. It was found that the work of water adhesion should be smaller by 50–100 mJ m −2 than the work of water cohesion to provide a high (∼95%) flotability of a mineral. A high flotability was found only for quartz/TDACl system at positive values of the water spreading coefficient due to high values of polar free surface energy at partial surface coverage with TDACl. This was attributed to formation of mixed water—collector layers on quartz and their effect on flotability. For salt-type minerals this effect was considerably smaller. The alteration of the wetting process model with both adsorbates on bare and collector-coated mineral surfaces was confirmed.
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