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Avg Bond Work Index: kWh/t: kWh/t: kWh/sh.t: kWh/t: kWh/t: kWh/t: kWh/t: Range: No of Tests: Alumina: 17.9: 7-34: 6: Andesite: 20.1: 18.3: 20.1: 19.5: …
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1. Crusher capacity calculated based on a feed material bulk density of 1.6 metric t/m³. Actual values depend on feed material characteristics and crusher configuration. All data should be used as a guide only and are not guaranteed. 2. For larger feed opening a Double Mouth Spider is available on request. Recommended maximum feed size up to 80%
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This example shows that Mill 2 is slightly more efficient than Mill 1 even though it has a higher power consumption per tonne. This shows the use of the work index equation taking into account the differences in feed and product sizes. The calculation is only part of the total plant performance study and must be tied into the total plant operation.
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Jaw Crushers; Cone Crushers; Typically, the initial crushing stage is completed using either gyratory crushers or jaw crushers. It is often the case that there will be only one crusher installed, and this will be referred to as the 'Primary Crusher'. Cone crushers are typically used for 2 nd, 3 rd & 4 th stage crushing steps (although not ...
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Primary crushers are designed so that the maximum size that can be presented to the crusher is approximately 80% of the gape. Jaw crushers are operated to produce a size reduction ratio between 4 :1 and 9 : 1. Gyratory crushers can produce size reduction ratios over a somewhat larger range of 3 :1 to 10 :1.
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designed from a crusher index only, which covers a very small reduction range, or using suppliers' charts, sometimes without any testing. At the other extreme, autogenous testing is arguably over-represented in the testing world, with at least six distinct small-scale testing methodologies (MacPherson, work index series, advanced media
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Cone crusher Cone crushers CC100 CC200 CC400 CC300 MHP400 MHP500 ... the above specification is an estimated performance of crusher. The data in the table is for the performance of the crusher feed with the dry material with a specific gravity of 1600kg/m3 in an opened circuit operation, also assumed the feed material's maximum size is under ...
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Manufacturer's data indicated that the nearest size of gyratory crusher would be 1370 mm x 1880 mm with a cone angle of 1 8 ∘. The work index of the ore was 14 kWh / t, the S. G.4.5 and the coefficient of friction, 0.43 . Calculate: 1. The closed set required to produce the desired product 2. The frequency of gyration.
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Bond Work Indices were also backcalculated from the data using the standard formula, i.e. where F80 is defined as the length of the side of the cube of the same weight as the average particle. Confirmation of the ability of the procedure to provide information suitable for the prediction of crusher performance was obtained by taking …
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S = reduction ratio (unitless) E = work index (kWh/t) Another formula for cone crusher capacity is given as: Q = (1.180 x D^0.85 x S^0.5) / E. where: D = closed side setting (mm) S = reduction ...
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13. Limestone. 16. Gold Ores. The kilowatt-hours per tone (kWh/t) will work out your work index. The number of kittowatts consumed in a hour divided by the tonnes of rock gives you your work index. Remember, the higher the Work Index the more work required to crush the rock. This will impact the equipment chosen for your project.
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The Pendulum Tester / Bond Impact Crushing Work Index Tester. Working principle Crushing by impact. 76 mm maximum feed size. Test repetition: At least 10, preferably 20 test runs. The Bond Crushing Work Index (CWI) describes the competency of the ore at larger particle sizes. It is used for the calculation of the actual crusher power requirements.
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Bond Ball Mill Grindability Test. The Bond Ball Mill Work Index (BBWi) test is carried out in a standardised ball mill with a pre-defined media and ore charge. The Work Index calculated from the testing can be used in the design and analysis of ball mill circuits. The test requires a minimum of 10kg of sample that has been stage-crushed to ...
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The Work Index represents the total work input necessary in installations of average efficiency. How to Find Work Index From Impact Crushing Tests. Where C represents the impact crushing strength (1) in foot-pounds per inch of thickness and S is the specific gravity, the Work Index is found by Equation 3. Equation 3: Wi = 2.59 C/S
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Bond Crusher Work Index; Bond Abrasion Work Index; Bond Ball/Rod Mill Indices; J-K Drop Weight Test* SMC Test®* ... HPGR; VXP *Licensed to conduct this test work at our facility, data is interpreted and results reported by the parent company. P150 High-Pressure Grinding Roll . The FL P150 High-Pressure Grinding Roll (HPGR) sizing machine ...
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Perhaps the most traditional measure of rock crushability is the Bond impact work index. Measured using Bond's standard pendulum apparatus [5], it has long been used to aid in …
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A Bond rod mill work index test (BRMWI) is a standard test for determining the rod mill work index of an ore sample [21]. The BRMWI is a measure of the resistance …
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(kWh/t) and WioACTis the Actual Operating Bond Work Index (kWh/t). • If the Wi Efficiency Ratio is 1.0 or , the circuit is per-forming with the same efficiency as the Bond Standard Circuit (and the ore Wi = circuit operating Wi), in accor-dance with the correlation that Bond (1962) established between plant operating data and test data ...
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The work index, W i, is 13.5 kWh/t ... Nevertheless, there is a lack of availability of complete data sets of crushers due to the challenges related to instrumenting and the very high cost; thus, it is still necessary to validate with data of different crushers in several operational conditions .
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The test determines the Bond Impact Work Index which is used with Bond's Third Theory of Comminution to calculate net power requirements when sizing crushers*. It is also used to determine the required open-side settings (jaw crushers …
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According to one estimate, the mining industry consumes 12EJ per year of energy – or 3.5% of total final global energy consumption.1 The energy intensity of mining is also predicted to increase over time as deposits that are lower quality, deeper and more difficult to extract are mined.
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Cone crushers and jaw crushers both work by compression, reducing materials by squeezing them until they break apart. The benefit that cone crushers offer over jaw crushers is their ability to output a more cubical product similar to impact crushers. Cone crushers have traditionally been used as secondary and sometimes tertiary crushing ...
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To evaluate the work index they considered the maximum size in the feed and also the maximum size of particles in the discharge from the crusher. To determine the size …
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ond crushing work index ( Wi) The ond crushing work index (Wi) describes the competency of the ore at larger particle sizes. It is used for the calculation of the actual crusher power requirements. The ond impact tester consists of two pendulum mounted hammers. • Pendulum mounted hammer with scale • Sample to be placed on the platform …
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First Online: 20 July 2023. 1 Accesses. Download reference work entry PDF. Work index indicates the difficulty of ore crushing or ore grinding in mineral processing operation. The …
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In the case of the Bond twin-pendulum device, data from 22 additional materials with widely variable values of crushability index, including copper and iron ores, bauxites, limestones, coals and ...
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The older Climax mine and concentrator used conventional crushing and single stage ball milling flow sheet that had the following comminution equipment installed: 3 – Primary gyratory crushers. 2 – 1.22M x 1.52M (48 x 60) jaw crushers. 14 – 2.13M (7 ft.) cone crushers. 8 – 2.74M x 2.44M (9′ x 8′) ball mills.
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The purpose of the primary crusher is to reduce the ROM ore to a size amenable for feeding the secondary crusher or the SAG mill grinding circuit. The ratio of reduction through a primary crusher can be up to about 8:1. Feed: ROM up to 1.5 m. Product: -300mm (for transport) to -200mm (for SAG mill) Feed Rate:
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The F80 values used were derived using a methodology that relates the primary crusher, close side setting (CSS) and ore hardness (Drop-Weight Index, DWi) to the primary crusher product P80 (Bailey ...
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The Bond work index is not solely a material constant but is influenced by the grinding conditions. For example, the finer the grind size desired, the higher is the kWh/t required to grind to that size. Magdalinovic [38] measured the Bond work index of three ore types using different test screen sizes. He produced a correlation between the mass of test …
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