Sep 02, 2015 · Dense Media Separation (DMS) Plants JXSC Machine. In a Dense Media Separation (DMS)/ Heavy Media Separation( HMS) plant, powdered ferrosilicon (an alloy of iron and silicone) is suspended in water to form a fluid near the density of diamond ( g/cm3), to which the diamondbearing material is added to begin the separation process of the heavier minerals from the lighter .