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I am currently running a batch flotation experiment on a polymetalic base-metal sulphide deposit, I am having issues with the bench top flotation tests.
Operating conditions:
I am floating Cu, Pb and Zn at the same time (run time 20 mins)
My chemical suite is: MIBC (12 g/t), Senkol700 (6 g/t) and S.E.X (80 g/t)
My p80 is: 65% passing 75 micron
My impeller is set at 1250 rpm and air flow at 7.5 L/min
My problem:
In some of my more dense ores types (magnetite dominant) I am forming a dead zone in the front (at the lip) of the flotation cell. This usually only lasts through my first three concs (+-10 mins), the only issue is this is the period when you are meant to be having your greatest mass recovery, and mine is being impeded by this dead zone. My current path is just increasing the frother (MIBC to 20 g/t) dosage, I just fear that this will increase entrainment. Does anyone have any advice?