the cyanidation plant consists of a primary crushing plant a semi-autogenous grinding circuit agitation leaching circuit cyclone wash circuit gold recovery circuit and carbon regeneration circuit. the grinding circuit comprises one 8530 mm diameter x 3650 mm semi-autogenous mill driven by a 3954 kw variable speed dc motor and one 5030 mm
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grinding systems are either 'open circuit' or 'closed circuit.' in an open circuit system the feed rate of incoming clinker is adjusted to achieve the desired fineness of the product. in a closed circuit system coarse particles are separated from the finer product and returned for further grinding.
definition of closed-circuit grinding a size-reduction process in which the ground material is removed either by screening or by a classifier the oversize being returned to the grinding unit. typical examples are a dry pan with screens dry milling in an air-swept ball mill and wet milling in a ball mill with a classifier.
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the characteristic differences between open- and closed-circuit grinding systems were examined via the use of a continuous vibration ball mill and a blade type classifier. for the same median diameter of the product the rate of powder production in the closed-circuit is about 5% higher than that of the open-circuit.