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The operating work index for the mill is extremely ore depe ndent and can range from as low as 7 kWh/t when treating soft supergene material to as high as 14kWh/t on the harder primary ores.

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complete ball mill plant costnostalgiafuture. The basic parameters used in ball mill design (power calculations) rod mill or any tumbling mill sizing are material to be ground characteristics Bond Work Index bulk density specific density desired mill tonnage capacity DTPH operating solids or pulp density feed size as F80 and maximum chunk size product size as P80 and

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The initial capital cost is estimated at 328 million inclusive of 47 million for . of the total capital cost by placing firm orders for the SAG and Ball mills The design of the processing plant and supporting infrastructure for the

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Following a successful commissioning and start-up we believe that two grinding lines at Las Bambas Perú each consisting of one SAG Mill and one Ball Mill (this mill combination is uniquely specific to Las Bambas ore types) are operating at design throughput of close to 140 000 tpd and within the range predicted by DJB from a managed multi-sample geometallurgical testing program (i.e. no

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The proposed model correlates the specific grinding energy the clinker work index and the specific surface (Blaine) of a cement produced through fine-grinding in ball mills.

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Bond Index Hardgrove Grindability Index Tests For. Lead Grindability Test Rdgrove grindability mill price ond ball mill grindability test summaryn the standard a-c closed circuit ball mill grindability test the work index is found from where pi is the opening in microns of the sieve mesh tested and gbp is the net grams of mesh undersize produced per revolution of the 12 x 12 test ball mill

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Thus the work index of the blend will be weighted towards the harder components [39]. Figure 3.16 shows the Bond work index of a blend of hard and soft ores as a function of the volume fraction of the softer ore in the blend. The dotted line between the two extremes indicates the weighted average work index based on volume fraction.

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The geometry of a mill with conical ends is shown in Figure 8.6. The total volume inside the mill is given by Vm 4 D2 mL 1 2(Lc L) L 1 (Dt/Dm) 3 1 Dt/Dm (8.16) The density of the charge must account for all of the material in the mill including the media which may be steel balls in a ball mill

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the SAG mill or Ball mill in the range of SAG product size adjustments from 0.4 mm to 3.5 mm. The SAG mill transfer size T80 can be adjusted using the Bond Work Index for product sizes coarser or finer than the basic SAG product (T80) of 1.7 mm. More specifically in the T80 range of 0.4 to 3.5 mm

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Sizing a Regrind Mill for Fine GrindingGrinding At Cadia the first Vertmill sizing was based on a Bond Wi of 16 kwh/t ten years ago the ore BWi is now 18.5 kwh/t after ten years so if you turn up at site and compare what the Ball mill or Vertimill or SAG is doing now with what it was sized based on ten years then for sure they are all under-performing 15 .

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First a Jar Mill grindability test requires a 5 lb. (2 kg) sample and produces a direct measured specific energy (net Hp-hr/t) to grind from the design feed size to the required product size. The second test a Bond Work Index determination results in a specific energy value

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Ball Mill. Drum screen BOND work index 12 kWh/to feeding F80 Read More. A New Approach to the Calculation of Work Index and the Potential The work index Wi was defined by F. Bond as the specific energy (kWh/ton) required to reduce a . using a novel ring mill a laboratory ball mill a labora-.

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Ball Mill. Drum screen BOND work index 12 kWh/to feeding F80 Read More. A New Approach to the Calculation of Work Index and the Potential The work index Wi was defined by F. Bond as the specific energy (kWh/ton) required to reduce a . using a novel ring mill a laboratory ball mill a labora-.

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Ball Mill Design/Power Calculation. The basic parameters used in ball mill design (power calculations) rod mill or any tumbling mill sizing are material to be ground characteristics Bond Work Index bulk density specific density desired mill tonnage capacity DTPH operating solids or pulp density feed size as F80 and maximum chunk size product size as P80 and maximum and

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