Effect of mechanical activation on depression of quartz in flotation
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The process of mechanical activation of quartz in a mill under conditions of self-abrasion has been studied. The physicochemical properties of the active surface formed in this process have been studied by ESR technique involving determination of the number of paramagnetic centers and by calorimetric technique involving determination of heats of wetting. These techniques show that the referred parameters are affected greatly by the conditions of mechanical and chemical treatment.
It has been shown that generation of surface defects upon mechanical impacts is an additional factor of depression of quartz flotability under the action of hydrofluoric acid, which makes it possible to reduce the consumption of the latter drastically.
It must be stated in conclusion that this work was done on “pure” quartz as a mineralogical study with no regard for the action of the unavoidable ions of a real pulp, especially of a mill material triturated upon mechanical treatment, which often greatly affects the flotation properties of minerals.
KeywordsMechanical Activation Electric Double Layer Hydrofluoric Acid Relative Electric Conductivity Fluorine Compound
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