This test determines the Bond Rod Mill Work Index, which can be used with Bond’s Third Theory of Comminution to calculate net power requirements of sizing rod mills The test is a closed-circuit, dry grindability test, is run in a standard rod mill, and can be performed at sizes ranging from 476 mm to ,
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 MoreProduct Cost = $1,000,000 + $350,000 + $38,000; Product Cost = $1,388,000 Therefore, the production cost of the company add up to $139 million for the period
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 MoreThe objective of feed mixing is to start with a certain assortment of ingredients called a "formula", totalling some definite weight This is processed so that each small unit of the whole, either a mouthful or a day's feeding, is the same proportion as the original formula
Get MoreRod mill work index is used in the SAGMILLINGCOM Bond/Barratt specific energy consumption model The work index is used to calculate the energy requirement to grind rocks in the medium size range, from 10 mm - 20 mm down to about 2 mm
Get MoreWork Index Bond estimated the amount of wear in terms of kilograms per kWh based on the abrasion index, A;, ie, Wet Ball Mill = kg kWh = 016(A i-0015) 033; Dry Ball Mill = kg / kWh = 0023A i 05; Replacement Ball Size Rowland and Kjos proposed the use of their equation for the determination of the initial and replacement media size
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Get MoreJan 01, 2009· 1 Introduction A Bond Ball Mill Work Index test is a standard test for determining the ball mill work index of a sample of ore It was developed by Fred Bond in 1952 and modified in 1961 (JKMRC CO, 2006)This index is widely used in the mineral industry for comparing the resistance of different materials to ball milling, for estimating the energy required for grinding, and for ball mill ,
Get MoreHow to use a divide head and rotary table The divide head and rotary table are a device used to rotate the work piece around a third machine axis, this is usually referred to as the 'C' axis and is commonly used on milling machines or borers to provide the ability to easily create accurate single or multiple machining operations around a component
Get MoreDec 18, 2013· For P80s finer than 75 μm, the Levin test, a modified Bond ball mill work index test, may be used to predict grinding performance Signature Plots No general work index formula governing energy use over a range of conditions, like the Bond equation for intermediate grinding, has yet been found for the fine grinding regime
Get MoreUsing a dividing head and a vertical milling machine to cut flats on a shaft Simple indexing method is used
Get MoreMill Machining, Milling Process, Horizontal & Vertical Milling Machines Definition Milling is a process performed with a machine in which the cutters rotate to remove the material from the work piece present in the direction of the angle with the tool axis With the help of the milling machines one can perform many operations and functions starting from small objects to large on
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 ,
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Get MoreMay 19, 2013· This video was put together by Joshua Wright and Aldo Vasquerizo as a supplemental lecture for University of Nevada RenoIf you have any questions, need advi,
Get MoreBond Index Ball Mill Rod Mill BT 100 XL RETSCH The grinding jar for the bond index rod mill is x in size and has a waveshaped design at least to kg sample material is required to simulate a closed grinding circuit in a ball or rod mill the rod mill work index rwi is used for particle size determination in a size range from mm down to mm whereas ball mill work
Get MoreW is the work index measured in a laboratory ball mill (kilowatt-hours per metric or short ton) P 80 is the mill circuit product size in micrometers; F 80 is the mill circuit feed size in micrometers Rod mill A rotating drum causes friction and attrition between steel rods and ore particl
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 More222 Impact breakage function In AG/SAG mills, there are two main breakage mechanisms: impact (high energy) and abrasion (low energy) For impact breakage mechanism, JKMRC institute is using the model of the percentage of broken product passing 1/10 the original particle size, t ,
Get MoreTo divide a circle into 20 parts: two turns of the crank would equal two 40ths, or one 20th of a circle One fourth of a crank turn (or 6 holes in a 24 hole index circle) would equal one 160th of a circle at the spindle Here is the formula: crank turns = 40 / N where N = ,
Get Morecalculated by the formula provided by Stamboltzis [7] PMN 99 (6) where M (kg) is the mass of balls (65 kg) plus the feed (05 kg), N (Hertz) is the rotating frequency and D (m) the mill diameter For the batch tests the mill is loaded and rotates for a time t (sec) consuming energy (Joules) This energy corresponds to a specific energy
Get Morecycle test akin to the Bond Ball mill work index determination The first cycle starts with minus 6 mesh ore removed since it is believed that the fines content can fill most of the voids allowing little room for rock breakage and piston movement Without adequate piston ,
Get MoreThis is because work index frequently changes as a function of the product size in comminution If target grind size during a project is changed, or if the test is run at the wrong product size, then it is necessarily to provide a correction The goal of this work is to create an equation to adjust a Bond ball mill work index from one P 80 basis
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 MoreAt least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill The Rod Mill Work Index (RWI) is used for particle size determination in a size range from 25 mm down to 21 mm whereas Ball Mill Work Index (BWI) is used for the range from 21 mm down to 100 µm Adjustment of grinding parameters:
Get MoreDec 04, 2020· Work index can change as a function of the product size of a Bond ball mill grindability test, which is controlled by the closing mesh size the test operator has chosen for the test
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