This study has been done to determine the galvanic interaction between
five types of grinding media (mild steel, cast iron, 10% chromium, 20%
chromium, and ceramic media) and galena, in situ of the mill. The ceramic media has a significantly not galvanic
interaction with galena and high chromium media has a significantly weaker
galvanic interaction with galena, and produces a very much lower amount of
oxidize iron species in the mill discharge than mild steel medium. The investigation
of the various reactions occurring on the galena surface was investigated by
ethylene diamine-tetra acetic acid disodium salt (EDTA) extraction and X-ray
photoelectron spectroscopy (XPS) measurements. The floatability of galena is
dependent on the galvanic current between grinding media and galena during
grinding because the current is relative to the amount of iron oxidation
species and the reduction rate on galena. Iron oxidation species depressed
galena flotation. The optimum galena flotation was achieved by selecting
grinding conditions that enabled iron oxidation to be controlled.
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