Abstract
While electrostatic attraction between mineral and collector is an underlying mechanism for the flotation of cassiterite with the collectors studied here, a number of other mechanisms, often determining, are superimposed on this basic mechanism. Other mechanisms such as the hydrophilic effect which controls the ease of water removal from the surface during collector attachment, electron transfer between collector and mineral, chelation, activation, chemisorption and doping also appear to be operating. In sum, these mechanisms produce the following general order of flotation of cassiterite with the collectors tested: Fe 3+-doped > undoped > Sb 5+-doped SnO 2 The Fe 3+-doped cassiterite typically floats at about one-tenth the collector concentration required to float the Sb 5+-doped material.
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