Several flotation experiments have been done using ethylene oxide/prop
ylene oxide copolymers as depressor agents, and it has been found that
the mineral recovery is greatly influenced by its size and little by
agent concentration. Also, it has been studied the flotation bath surf
ace tension with regard to different non-ionic surfactants concentrati
ons and to pH. The results obtained show that Monolan 8000/E80 as well
as Monolan PC reduce considerably the bath surface tension, although
they are insensitive to bath pH changes or the used concentrations ran
ge.