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Medium Density

Medium density is controlled by the proportion of ferrosilicon solids present in the medium; it is increased by adding more ferrosilicon, and reduced by adding water.

A high medium density results from:

• A high concentration of solids in the medium
• A high absolute density of the solids in the medium

Thus ferrosilicon with a relative density of 6.8 will always produce a higher medium density at the same solids concentration than magnetite which has a relative density of 4.5.

The medium density determines to a large extent the density at which the separation will take place, and is the main variable available to the operator for controlling separation. In static bath separators, such as drums and cones, the separating density (or cut-point) is generally close to the medium density. In dynamic separators, such as cyclones and tri-flows, the separating density is usually somewhat higher than the medium density.

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