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determined by simulating a dry grinding in a closed circuit in the Bond ball mill to achieve 250% circulating load (Bond, 1949, 1952, 1961). The test is performed on a raw material approximately weighing 10 kg, which coarseness is 3.327 mm. The first grinding test is performed on a 700 cm3 volume sample with an arbitrary

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This enables a more objec- tive identification of the energy required for grinding in the case when, for a certain grinding-product size, we do not dispose of the appropriate work-index value established by experiments. 46 REFERENCES Bond, F.C., 1961. Crushing and Grinding Calculations. Allis Chalmers, Milwaukee, Wisc.

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For full details, refer to the original Bond paper (Ref Bond, F.C. 1961. "Crushing and Grinding Calculations Part I and II", British Chemical Engineering, Vol 6., Nos 6 and 8). A Bond Ball Mill Work Index test may be required for the design of a new mineral processing plant.

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As a fast method, the determination of the Bond index from the Hardgrove index (by calculation) is almost matching with measured Bond's work index. The Bond's work index of the above rock samples calculated from the Hardgrove index value has shown a variation from 7.7 to 10.3 kWh/sh.t. Bond, F.C, (1961) "Crushing and Grinding

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16. Carry out three wet screen analyses on the undersize of the last three net grams per revolution (Grp) to calculate the work index. Wet bond mill test 373 REFERENCES Bond, F.C., Crushing grinding calculations Part I. British Chemical Engineering, 1961, 6(6), 378-385. Bond, F.C., Crushing grinding calculations Part II.

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