The Bond Work Index (Wi) is a common technique for the estimation of hardness and energy requirement for comminution using ball mills. However, this technique is timeconsuming (close to 5...
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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 a...
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E=10× √P − √ F 80 80 ) ( 1 ) Where: E is the specific energy consumption in kWh/t Wi is the work index (see discussion below for the units of this quantity) P80 is the 80% passing size of the product of the comminution process in μm F80 is the 80% passing size of the feed to the comminution process in μm
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The work index equation for a ball mill test was generated by Fred Bond to empirically predict the operating work index of an industrial ball mill (8 ft dia by 8 ft effective...
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Calculate a Mill's Operating Work Index 911 Metallurgist. Mar 14, 2015 · Use this online formula to calculate a Ball Mill, Rod Mill or SAG Mill Operating Work Index Based on Fred Bond's you can estimate the energy used into your grinding circuit This is the most accurate and informative method, but much of the data necessary for its . Get Price
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The Bond work index, Wi, is defined in a Bond ball mill on the samples of standard size − + 0 mm. In practice, it is possible to find materials of nonstandard size that are finer than mm. In this work, a procedure for the calculation of the Bond work index is suggested for cases when the Bond grindability test is conducted on ...
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The second study was used to develop a correlation between ball mill operating data and grindability test data. This was based on the Work Index concept. From this concept came two equations: (a) the equation to determine the Work Index from Bond grindability tests, and (b) the Bond equation, which uses the Work Index to determine the energy ...
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WioACT Actual Operating Bond Work Index determined from measurements on the circuit (kWh/t) WiRM Bond Rod Mill Test Work Index (kWh/t) WiSTD Standard Circuit Bond Work Index (expected or designed) used for circuit design. Specific energy requirement at the drive pinions. Work Index, Work Index Efficiency, Bond Work Index testing
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CERAMIC LINED BALL MILL. Ball Mills can be supplied with either ceramic or rubber linings for wet or dry grinding, for continuous or batch type operation, in sizes from 15″ x 21″ to 8′ x 12′. High density ceramic linings of uniform hardness male possible thinner linings and greater and more effective grinding volume.
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Thus if d B is the ball diameter (mm), W i is the work index of the ... to grind 250 tph of limestone from an 80% passing size of 10 mm to 100 μm in a closedcircuit wet overflow discharge ball mill. Calculate the mill size required to handle the required throughput. ... The feed size of an ore to a m × m wet ball mill operating in ...
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Contents: INTRODUCTION FORMULATION OF THE PROBLEMS FACING THE DESIGNER OF GRINDING CIRCUITS: Grinding as a unit operation Formulation of the problems facing the designer of grinding circuits Defintions of terms and concepts Mill conditions in tumbling ball mills defintions Levels of compexity the different approaches to mill sizing A REVIEW OF THE OLDER LAWS OF GRINDING: Kick ...
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Bond's work index determination, since its inception in 1952, is being used to estimate the power required for milling, sizing of mills and calculation of milling circuit efficiency. The ...
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sbm/sbm ball mill operatng work index rwrr KiB . View; Log; Blame; View raw; Permalink; c1849ea5 — dihog VII 4 months ago
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The energy was calculated by first working out the mill power by using (2), where M is the total mass in kg of the balls and the feed material, N is the rotational speed in hertz and D is the...
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The most reliable work indicator values are those acquired upon long term operating data. Whenever this is not available, standard grindability tests can remain run to provide approximate values. ... Ball Roller Power Calculation Model #1. A wet grinding ball mill in closed circuit is to be detective 100 TPH of a substance with a work index of ...
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The ball mill grindability test is used for describing ore hardness and it is so widespread that the Bond Work Index generated from the test is often referred to as an ore characteristic. The ore resistance to grinding and energy consumption can be expressed using the work index and Bond's Third Theory.
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Grinding in Ball Mills Modeling and Process Control. Grinding in Ball Mills, the work index of the material, the mill shaft power and, depending on the type of the mill, the operating conditions and the type of the...
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The Bond Work Index was then calculated using the following equation. (1) WI BM = ∗ P 100 ∗ G pr ∗ 10 P 8010 F 80. Where WI BM is the Bond Ball Mill Work Index (kWh/t), P 100 is the closing screen aperture (μm), G pr is the net grams of product per revolution, P 80 is the product 80% passing size (μm), and F 80 is ...
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Bond Ball Mill Work Index, BWi, kWh/t Bond Rod Mill Work Index, RWi, kWh/t Table 1. Example of AG/SAG Ball Mill Circuit Wio Calculations [1] [2] ABstrAct Optimum use of power in grinding, both in terms of grinding efficiency and use of installed capital, can have a large effect on profitability. Mill operators have long used operating ...
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For any circuit, whether a crushing circuit, a rod mill, or a closed ball mill circuit, the Work Index always means the equivalent amount of energy to reduce one ton of the ore from a very large size to 100 um. The sample was received crushed appropriately for the ball mill test.
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The ball milling requirements of HPGR and standard crusher products are measured. • Methods for assessing the energy consumption of the Bond Ball Mill are discussed. • The average reduction in Work Index of HPGR products was kWh/t. • A similar magnitude of reduction was observed in the Size Specific Energy. •
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Rowland,, 1978, "Determination and use of operating work indices in controlled grinding circuitsA proposed concept," Mill Operator's Conference and Exhibit, Northwestern Branch, Australasian Institution of Mining and Metallurgy, Mt. Isa, Queensland Australia, June. Google Scholar
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In this paper, a new method based on the Population Balance Model (PBM) is proposed and validated to estimate the results of the Bond ball mill work index test (Wi B). The model presented in this study combines the first cycle of the Work Index test (at 250% circulating load) with the PBM.
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This Grindability Test or Bond Ball Mill Work Index Procedure is used to determine the Bond Work Index of minus six mesh or finer feed ore samples. These equation application methods are used to process <1/2″ ore samples in a Ball Mill using a standard ball charge.
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