Nov 18, 2014· Test design Slide 12 Main purpose Maximum Capacity Cost low Energy Size Division Less fines Production Bond's work index 13 Test design Slide 13 Effect of circulating load on Bond's work index The follow figures shown variation in the Bond work index ,

Sales OnlineThe Bond ball mill work index is one of the most commonly used grindability tests in mining, and is often referred to as the Bond work index The test is a 'locked-cycle' test where ground product is removed from test cycles and replaced by fresh feed

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Sales OnlineJun 11, 2020· The Bond rod mill work index ( Wir ) is measured using Bond´s standard rod mill grindability test, which is conducted in locked-cycle mode to emulate the continuous closed-circuit operation Besides the labor-intensive conduct of the test, which typically requires from 5 to 10 cycles for reaching steady-state, it normally requires 8–20

Sales OnlineIn Mineral Processing Design and Operations (Second Edition), 2016 347 Bond rod mill standard test Standard conditions for determining the work index of rod mills under laboratory conditions are: mill size = 305 mm (internal diameter) × 610 mm (internal length) with wave type lining

Sales OnlineThe 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 passing size of

Sales OnlineBond Rod Mill Grindability Test The test determines the Bond Rod Mill Work Index which is used with Bond’s Third Theory of Comminution to calculate net power requirements when sizing ball mills* Various correction factors may have to be applied The test is a closed-circuit dry grindability test performed in a standard rod mill

Sales OnlineThe Bond's standard ball mill is used to determine the work index value of differ ent sampl The Bond work index is defined as the kilowatt-hours per short ton required to break from infinite size to a product size of 80% passing 100 µm If the breakage characteristics of a material remain constant over all size ranges, the calcul ated work ,

Sales OnlineThe Bond Index conforming rod charge consists of: 6 rods of 125“ diameter and 21“ length; 2 rods of 175“ diameter and 21“ length; The grinding jar for the Bond Index Rod Mill is 12″ x 24″ in size and has a wave-shaped design At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill

Sales OnlineGenerally, 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 rod-mill work index based on the conventional Bond work index

Sales OnlineThe equation is in two parts, and you need a Bond ball mill work index The only thing to be careful of is that the laboratory uses a Bond rod mill with a » Learn More design of bond rod mill work index – Grinding Mill Chin Titan Bond Work Index Rod Mill Titan Process ,

Sales OnlineMill is stopped and about 250 grams of the sample is charge In to the ball mill along with the balls Before feeding the sample into the mill feed size (D f) is measured either by volume displacement method or Feret’s method 4 , Work Index[Bond’s law constant) Wi=[E] ÷[1/ ,

Sales OnlineTests range from industry standards, such as Bond Work Index Testing, to cutting-edge techniques such as pulp chemistry monitoring, to help optimise comminution circuits We are also a accredited laboratory for fine grinding We have comminution equipment including ball mills, rod mills and a range of crushing equipment

Sales OnlineIn conjunction with the Bond ball mill work index they can be used to accurately predict the overall specific energy requirements of circuits containing: AG and SAG mills, Ball mills, Rod mills, Crushers, High Pressure Grinding Rolls (HPGR)

Sales OnlineThe mill product can either be finished size ready for processing, or an intermediate size ready for final grinding in a rod mill, ball mill or pebble mill AG/SAG mills can accomplish the same size reduction work as two or three stages of crushing and screening, a rod mill, and some or all of the work of a ball mill

Sales OnlineComparing of Ball Mill Design using Bond Work Index Kroll Institute of Extractive Metallurgy Colorado School of Mines Mr Tyrel Jacobsen & Dr Corby G Anderson 2/6/2017 Abstract

Sales Online8-3 Centrifugal force outward Fc mp& 2 Dm 2 (81) & is the angular velocity, mp is the mass of any particle (media or charge) in the mill and Dm is the diameter of the mill inside the liners Gravitational force Fg mpg (82) The particle will remain against the wall if these two forces are in balance ie

Sales Onlinestandard Bond crushing, and rod mill work indices, abrasion indices and by Dawson for Bond Ball Mill Work Index tests using crushed feed, and Standard Autogenous Grinding Design (SAGDesign) Tests, patented by Outokumpu (See reference 8 below) The comparison of these results gives context to how the various measurements relate to each

Sales OnlineEF5BM=[ P80+103 1145×P80] ( 3 ) The EF4 formula requires both the rod mill and ball mill work index (rod mill Wi is used to calculate the optimal feed size) and because this is a “single-stage ball mill” calculation, the F80 is actually the rod mill feed size (10,000 µm) from Table 1 and the P80 is the ball mill circuit product The EF5 factor only applies below 75 µm to ball

Sales OnlineW 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

Sales OnlineRod mills normally carry 35 to 65% rod charge by volume The limits on charge level are (1) keeping the feed end trunnion open so that feed will get into the mill, and (2) keeping the rod charge low so rods will not work their way into discharge openings where they can cause rod tangling

Sales OnlineKey words: Comminution, Bond work index, Grinding, Crushing, Ball mills, Rod Mills Theoretical efficiency In their book Process Engineering of Size Reduction - Ball Milling, Austin, Klimpel and Luckie (1984) stated that, "We have tried throughout this book to avoid the use of the term grinding efficiency because the degree of conversion of ,

Sales OnlineBond Work Index for Rod Mill Product Image Introduction The Bond Work Index for Ball Mill is a special equipment for testing Bond ball mill work index Simple lab test can choose ball mill by power method or judge the effects of material properties change to the ball milling process or the operation condition of crusher by using this ,

Sales OnlineAn ore fed to a rod mill has a Bond Work Index of 140 kW×hr×t-1 The P80 of feed to the mill averages 250 centimetres and the P80 of the product from the mill is 0104 millimetr a) Calculate the work required to grind the ore to the product size b) Calculate the reduction ratio

Sales OnlineStructural Shapes – standard steel configurations produced by steel mills such as wide flanges, channels, angles, pipe, tubes, etc Structural Steel – the structural elements that make up the frame that are essential to supporting the design loads, eg beams, columns, braces, plate, trusses, and fasteners It does not include for example ,

Sales OnlineDec 11, 2018· A bond that matures in 10 years fluctuates less in price than a bond that matures in 30 years If the investor needs some funds before the bond’s maturity, the rise in interest rates causes a ,

Sales OnlineThis 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 ,

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Sales OnlineBall mill design requires a Bond work index, BWi, for ball mills at the correct passing size; SAG mill design requires an appropriate SAG test, for example, SPI (Chapter 5) Flotation design needs a valid measure of kinetics for each sample, including the maximum attainable recovery and rate constants for each mineral ( Chapter 12 )

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