kolkata ball mill work index calculation xls Ball Mill Operatng Work Index Effeciency-BWI = Bond ball mill work index on SAG ground ore kWh/ton ground F 80 = 80% passing of SAG ground of the test feed size microns P 80 = 80% passing from the test product size microns P cs = Bond closing screen size microns G pb = Ball mill grindability average of last three cycles gr/rev Determination of the SAG and Ball Mill …
Mar 17, 2017 · Use this online formula to calculate a Ball Mill, Rod Mill or SAG Mill Operating Work Index. Based on Fred Bond’s work 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 application is not yet available. A) Total Apparent Volumetric Charge Filling – including balls and excess slurry on top of the ball …
Apr 08, 2018 · Ball Mill Motor/Power Sizing Calculation; Ball Mill Design/Sizing Calculator; The power required to grind a material from a given feed size to a given product size can be estimated by using the following equation: where: W = power consumption expressed in kWh/short to (HPhr/short ton = 1.34 kWh/short ton) Wi = work index, which is a factor relative to the kwh/short ton required to reduce a …
Mill diameter; Mineral density; Work Index. Bond estimated the amount of wear in terms of kilograms per kWh based on the abrasion index, A;, i.e., Wet Ball Mill = kg kWh = 0.16(A i-0.015) 0.33; Dry Ball Mill = kg / kWh = 0.023A i 0.5; Replacement Ball Size
ball mill work index calculation xls. Ball Mill Design/Power Calculation. 2020-6-25 Ball Mill Power Calculation Example #1. A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work index of 15 and a size distribution of 80% passing ¼ inch (6350 microns).get price
Ball mill work index test was widely used in the 1960s and still remains in use today (Gharehgheshlagh 2016). The ball mill work index of the feed samples was determined according to the standard
You need a two-stage solution, first stage open-circuit mill and then second stage closed-circuit mill. First stage, will be broken into two parts as well, you use a Bond rod mill work index for the coarse component of the ore (+2.1 mm) and the Bond ball mill work index for the fine component (-2.1 mm)
Mar 08, 2013 · calculation of ball mill grinding efficiency. dear experts . please tell me how to calculate the grinding efficiency of a closed ckt & open ckt ball mill. in literatures it is written that the grinding efficiency of ball mill is very less [less than 10%]. please expalin in a n excel sheet to calcualte the same. thanks. sidhant. reply
Oct 19, 2017 · It uses to help determine the grinding media optimal size must be loaded into the ball mill for proper operation ensure. The calculation formula is below: B — the grinding balls diameter, mm; A — the correction factor (for grinding balls A = 20,17; for cilpence A = 18,15);
from a global test set were tested using the two ball mills to determine the Bond Work Index of . the materials. ... This number was used in the final Bond Work Index Calculation. 15
The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test. Its value constitutes ore characteristic and is used for industrial
Oct 24, 2018 · To calculate the operating work index of a circuit, you must measure four things: P: The power draw of the mill. This is usually calculated from the input leads to the motor, then multiplied by
The ball mill work index laboratory test is conducted by grinding an ore sample prepared to 100% passing 3.36 mm (6 mesh) to product size in the range of 45-150 µm (325-100 mesh), thus determining the ball mill work index (Wi B or BWi). The work index calculations across a narrow size range are conducted using the appropriate laboratory work index determination for the material size of interest, or by …
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 100% passing size of <3.35 mm. Any screen size below 600µm can be used for the testwork depending on your requirements. Bond Rod Mill Grindability Test
Jan 01, 1989 · INTRODUCTION The energy consumption for grinding, according to Bond (1961), is deter- mined by the formula: / 10 10 (I) The work index is determined by grinding experiments carried out in a labo- ratory Bond ball mill. Based on the results of grinding experiments, numerical values of the work index Wi are calculated according to the formula: 0301-7516/89/$03.50 1989 Elsevier Science …
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