The goal of this work is to create an equation to adjust a Bond ball mill work index from one P 80 basis to another The proposed model consists of two components, the variable coefficient that is determined from a specific work index determination and a fixed exponent determined by a calibration procedure
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Get MoreJul 10, 2017· Calculate the discharge work opening as per formula given below: F x 634296 Discharge work opening = ----- mm S x V x L Where ‘S’ denotes the Fibre Index to be read from Table – 1 Actual Discharge Work Opening = (Discharge work opening – Roller Rise) mm
Get MoreThe ball mill work index laboratory test is conducted by grinding an ore sample prepared to passing 336 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 ,
Get MoreOct 24, 2018· The work index can either be measured in the laboratory (the Bond ball mill work index determination is a common example) or it can be calculated from the operating performance of ,
Get Morework index covering grinding of fine particles is labelled M ib (Morrell, 2008) M ia values are provided as a standard output from a SMC Test ® (Morrell, 2004 a) whilst M ib values can be determined using the data generated by a conventional Bond ball mill work index test (M ib is NOT the Bond ball work index) M ic and M ih ,
Get MoreCalculation of the Exponent n and the Wi For any test the data collected is the size d 80 (μm) of the feed x 1 and the product 2 and the specific energy x 1,2 e (kWh/ton) used to achieve this size reduction Initially the work index i (kWh/ton) is calculated from (5) as- W suming n = 05 As explained earlier, the calculated val-
Get MoreBond Tests SGS bond f c, crushing tests by pressure and impact, trans aime, vol , , pp bond rod mill grindability test the test determines the bond rod mill work index which is used with bonds third theory of comminution to calculate net power requirements when sizing ball mills various correction factors may have to be applied
Get MoreThe work index is used to calculate the energy requirement to grind rocks in the fine size range, below 25 mm into the range of a few hundreds of micrometr Heterogeneous ore types typically are sensitive to the product size of the test, and the work index value changes if the test is performed to a ,
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Get MoreGenerally, Bond work index is a common method for selecting comminution equipment as well as estimation of grinding efficiency and calculating required power In the current research, a simple, fast and accurate procedure is introduced to find the
Get More322 D Todorovic, M Trumic, L Andric, V Milosevic, M Trumic micrometers in size According to the Bond standard procedure, the work index is determined by simulating a dry grinding in a closed circuit in the Bond ball mill to
Get MoreMilling operations remove material by feeding a workpiece into a rotating cutting tool with sharp teeth, such as an end mill or face mill Calculations use the desired tool diameter, number of teeth, cutting speed, and cutting feed, which should be chosen based on the specific cutting conditions, including the workpiece material and tool material
Get MoreThe ball mill work index laboratory test is conducted by grinding an ore sample prepared to 100 passing 336 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) Ball Mill Work Index Calculation - ra-warneckede Ball Mill Work Index Calculation Xls
Get MoreThe purpose of this final calculation is to obtain a resulting whole number by applying different total holes per series into the calculation ie, for 37 hole series - 1480 must be inserted into the equation, or for 21 hole series, 840 should be used If a whole number can not be achieved then a hole series must be used with the least amount of ,
Get Morerod mill work index has not been de ned as yet The ball ﬁ mill work index is con rmed at 16 kWh/t The operating ﬁ work index, though, is in the range of 21 kWh/t to 25 kWh/t showing high inefﬁ ciency This raises the point that, in some cases, the Bond EF4 oversize factor calculation is
Get MoreFeed Characteristics (work index) Reduction Ratio; Under given load and particle size requirement, capacity is a function of mill length and diameter: Q = kLD 2+N N is related to mill diameter which decreases with larger diameters k a constant equal to Ï€ /4 A chart showing rod mill capacity vs mill ,
Get MoreOct 19, 2017· Bond formula for the grinding balls size calculation October 19, 2017 Archive 0 The enterprises consumers grinding media have a question about right choise the grinding ball size (diameter) for the mill in order to achieve the required grinding quality
Get MoreJul 30, 2020· The Bond Ball Mill Work Index can be used in the design calculations and simulations using JKSimMet of a new grinding circuit A Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mill(s) and the associated grinding circuit(s)
Get MoreHardgrove index and brittleness test can be carried out easily on only those ores or rocks or materials, which are soft, friable and brittle [1-3] Indices with which the crushing resistance or the grindability in a wide meaning is expressed include the Rittinger number, crushing resistance, Hardgrove index and Bond work index
Get MoreBall mill work index adjustment The Bond ball mill work index test requires the operator to select an appropriate screen size to "close" the test The procedure states that the closing screen size should be such that the product size of the test is the same as the expected product size of the operating plant
Get MoreCalculation of energy required for grinding in a ball,A bond ball mill work index is then performed on the mill product for the design of sagball mill circuits this is important because it was found that there was a 115 kwht higher ball mill work index if the 335 mm ball mill test feed size is moretget price
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Get MoreThe SAG mill pinion energy, W SDT (kWh/t) and SAG discharge Bond ball mill work index, S d-BWI (kWh/t), are then used to calculate the total energy to grind the ore from 80% passing 152 mm to 80% passing the client specified final product size P 80This information, along with the ore specific gravity, is used to calculate necessary mill sizes and motor power in industrial applications
Get MoreBond Ball Mill Work Index, BWi, kWh/t 134 Bond Rod Mill Work Index, RWi, kWh/t 181 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
Get MoreBond ball mill work index test is used to calculate the work index related to fine grinding (Mib) Mia and Mib are used to calculate Ecs for the coarse (Wa) and fine (Wb) components according to ,
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