The Mechanical Behaviour of Water and Gas Phases in a Pilot Scale Baum Jig

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Abstract
Seven signals were accurately measured and data logged in exhaustive experiments using a highly instrumented and controlled pilot scale Baum jig. These signals provide a basis for understanding the effect of the operating parameters on the air and water behaviour in the jigging process. The measurements include the air pressure, water pressures and displacement, the hutch water flowrate. A Fourier decomposition method was applied to remove signal noise and smooth the signals. Water velocities and accelerations are calculated from the smoothed displacement data. The frequency of pulsation, air pressure in the accumulator and inlet period of the air cycle play significant roles in determining the air and water behaviour in the jigging process. The bed thickness. expansion period of the air cycle, hutch water flowrate and the rate of opening of the inlet valve are less important. The characteristics of four typical air cycles, namely, the conventional Baum jig cycle. Mayer cycle. Jeffrey/Bird cycle and the cycle with a long inlet period were investigated. The substantial differences in water motion generated by the four cycles demonstrate the importance of selecting a suitable air cycle. The jig beds used in the study were composed of synthetic particles (3 to 35 mm) having densities in the range 1.3 to 2.0 tonnes/m3.

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