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Analysis of the historic mill power draw, site data on ball filling provided by mill grind-outs, and applying the Morrell Power model (Morrell, 1993) to back-calculate approximate mill filling ...

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mills with the rod mill and ball mill laboratory work indices. Note, in Figure. 1, that the rod mill product slope is less than 0.5 due to an extra amount of nes present being fi fi ner than 650 μm. These fi nes proceed to the ball mill improving the ball mill effi ciency. Also, the plotted rod mill P80 value, as shown in Figure 1, is 2900 ...

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The results showed that the HPGR ball mill circuit achieved a 21% reduction in energy consumption over the existing SAG ball mill circuit at the same P80 grind size of 160 µm. At a grind of 80% passing 75 µm, the HPGR stirred mill. POLYCOM HPGR ball mill grinding circuit > Grinding plants . POLYCOM HPGR ball mill grinding circuit.

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SMC Test 22 N/A 5 Single Particle N N/A ... The world widely relies on the ball mill work index for the design and analysis of ball mill circuits, even those that treat AG/SAG mill or HPGR circuit products, which have ... calculate the power requirement to grind from ~½" to about 14 mesh. The test has been mainly used for the design of

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above the nominal mill throughput. Considering a mill runtime of 94% and a final P80 size of 180 micrometers, the proposed circuit consists of a SAG mill 40 feet in diameter and 25 feet in length (EGL), with an installed gearless motor of 30 MW and two 28 feet diameter by 44.5 feet in length ball mills equipped with 22 MW gearless motors.

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In Grinding, selecting (calculate) the correct or optimum ball size that allows for the best and optimum/ideal or target grind size to be achieved by your ball mill is an important thing for a Mineral Processing Engineer AKA Metallurgist to do. Often, the ball used in ball mills is oversize "just in case". Well, this safety factor can cost you much in recovery and/or mill liner wear and tear.

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DWi and point load index (IS50) making it valuable in Mine-to-mill studies as well. For power-based calculations the SMC Test® also provides the comminution indices Mia, Mih and Mic,which are routinely reported when a test is carried out (see Table 1 below). In conjunction with the Bond ball mill work index they can be used to

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