FLSmidth: Vanning Plaque Tutorial

I'm going to I'm going to demonstrate the use of a banning plaque that we used to separate minerals by specific gravity when we're running a processing tests such as flotation it's a valuable tool that you can use you use this to separate the minerals and then you can look at them under the microscope so that you can tell what you're doing when you're running the test we're taking approximately a hundred milliliters of floatation slurry which is will give me approximately 50 grams of solid sample the first thing you do is to wash off the slimes so that you can see what you're doing usually two or three washings are enough to remove the slimes if you don't have security intervals that you're trying to look at okay this is about the right amount of material on the banning plaque I can say it's it's approximately 50 grams you use enough water to cover the sample as something you can fluid eyes it this is about the right amount here and then the key to the technique is you swirl the plaque with the sampling it to fluidize it and at the same time that you're swirling you hit the edge of the vanni plaque to bring the heavy minerals to one side and the heavy minerals will travel towards the edge of the van in fact that you're tapping motion is on ok remove the excess water and what we have here is the heavy minerals in this case this is a sulfide sample gold-bearing fire right is now separated from the gangue mineral which is mostly chords you can now look at this material under the microscope and see if you've got good liberation locking or whatever other features you want to look at there occasionally if you're looking at a concentrate sample that has reagents added you form a froth on top and you can break this froth up by spraying it with a solution that's half gram per liter saitek arrow dry 100 or some similar so surfactant you