Abstract
A two-stage cylinder-cyclone system has been developed, incorporating a variable concentric aperture valve between the cylinder and the cyclone units. By adjusting this interstage flow control valve, the separation size of the cyclone can be varied as required. The system has successfully classified coal and mineral slurries prior to split conditioning and desliming tests in small-scale continuous flotation circuits. An experimental rig for fine-coal cleaning is described where the slurry feed to a spiral was varied over a wide range of conditions using the cylinder-cyclone system. The variable product size capability was also very useful in a laboratory-scale ball mill circuit, where the dilute cylinder overflow stream was recycled to the ball mill discharge sump to provide a very stable operation. This closed-circuit ball mill configuration is currently operating commercially in a number of gold cyanidation plants in Australia.
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