Advances in gravity concentration by R.Q. Honaker, W.R. Forrest

By R.Q. Honaker, W.R. Forrest

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All rights reserved. Electronic edition published 2009. MODELING OF HINDERED-SETTLING COLUMN SEPARATIONS Overflow Product Element N+1 Element N Feed Solids Element F Element 1 Underflow Product Element 0 Representation of the hindered-settling column by elements as used in the finitedifference solution scheme FIGURE 2 To incorporate the set point concentration into the hindered-settling model, it is important to include the operation of the control valve. In the early stages of the separation process, the control valve remains closed until a sufficient amount of dense and/or large particles build a bed that is thick enough to reach the set point concentration.

The length of the middle section can be changed to vary the overall column height. The column sits on a stainless steel dewatering cone, which is attached to an electro-pneumatic pinch valve. The valve is controlled by a PID controller, which also monitors the bed pressure. The teeter water and feed water rates are controlled with rotometers. © 2003 by the Society for Mining, Metallurgy, and Exploration. All rights reserved. Electronic edition published 2009. MODELING OF HINDERED-SETTLING COLUMN SEPARATIONS Feed Solids Feed Water Overflow Particles Water Teeter Water Teeter Water Distributor Pressure Sensor Pneumatically Actuated Control Valve Underflow FIGURE 1 Schematic of the hindered-settling column The solids are fed through the top opening of the column along with feed water.

In general our interest is in predicting the overall partition curve for a given feed. Given the Ep values of the individual curves are relatively small, it is reasonable to consider the separations of individual particle sizes as perfect, and then simply focus on the variation in the D50 with the particle size as this governs the overall Ep for the full size range. Within the Reflux Classifier, the relevant separation condition is assumed to exist just above the sediment bed near the base of the vessel.

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