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EXTRACTING GOLD FROM GRAVITY CONCENTRATES USING
Figure 2.14 (Above) Gold particle shape after grinding in (left to right) hammer mill, disc mill, vibratory pulveriser, ball mill (from Ofori Sarpong Amankwah, 2011, pg 591). (Below) Gold particles ground in rod mill from this thesis (photo credit Gavin Clarkson
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Semi batch tests were performed on a bulk sample of the ore, using a 1.2 m diameter mill. Various mill speeds and two pebble feed size ranges were tested (i.e. 65mm/35mm and
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Figure VIII 13 Simulated mill power as function of mill speed for the 30.5 cm batch ball mill equipped with square lifter bars running at 30 % filling with 25 mm balls .. 134 Figure VIII 14 Effect of ball size on the simulated power draw of a 30.5 cm ball mill running
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Comparison of grinding mediaCylpebs versus balls
The locked cycle test therefore provides the size distributions of the fresh feed, the final screen undersize and final screen oversizethat is, the total mill charge is sized.
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