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# rod mill work index formula

The test determines the Bond Ball Mill Work Index which is used with Bond’s Third Theory of Comminution to calculate net power requirements*. Various correction factors may have to be applied. W = Wi (10/√P – 10/√F) Where W = Net power consumption in kWh/t …

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Dec 12, 2016 · 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

• ### rod mill - an overview | sciencedirect topics

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. material dry mineral. size − reduced to 100% < 13,200 μm. quantity − 1250 cm 3 (tapped down to give a reproducible bulk density)

• ### bond work index procedure and method

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. Below describes in general terms the Bond Work Index Procedure used by a Professional Metallurgical Testing Laboratory. If you

• ### bond work index - an overview | sciencedirect topics

It involves grinding 50g of the material, e.g. coal, of specified size (16–30 mesh cut) in a specified ball-and-race mill for 60 revolutions. The amount of 200 mesh material is measured ( w grams) and the index is defined as I = 13 + 6.93 w. Thus, the higher the index, the easier is the grinding task

• ### bondindexballmill/rod millbt 100 xl - retsch

3.35 mm with ball module / 12.50 mm with rod module: Final fineness* 100 µm with ball module / 2,100 µm with rod module: Batch size / feed quantity* min. 15 kg with ball module / min. 20 kg with rod module: Rotation speed: 70 min-1 with ball module / 46 min-1 with rod module: No. of grinding stations: 1: Material of grinding tools: hardened steel

• ### rapid determination of bond rod-mill work indexby

Jan 01, 2013 · To calculate Bond rod-mill work indices, the four samples were screened and the particle size distributions plotted in Fig. 2.The plot was used to find F 80 of the samples for calculations. Fig. 3, Fig. 4 show the grinding kinetics of Pb, Cu, Fe, and Mn ores in the Bond rod-mill in different test-sieves. The slopes of all lines in the figures are equal to the k value of Eq

• ### amit 135: lesson 8 rod mills– miningmilloperator training

Rod mill power is dependent on mill capacity and work index. Mill power increases with: Increasing rod charge; Increasing mill speed; Increasing mill length. Rowland and Kjos (1980) provided an expression to quantify power draw at the pinion shaft per unit mass of rods: Pâ†“M / Mâ†“R = …

• ### astudy of simulating the calculation method ofthe bond

Jan 01, 1992 · Based on the nth order grinding kinetic equation and the theory of linear additivity in the grinding process, the grinding kinetic characteristics of the feed and the circulating load in standard Bond rod-mill grindability tests are studied.A new method of simulating the calculation of the Bond rod-mill work index by using the grinding kinetic test data of the feed is proposed

• ### geugle bond ballmill index

Bond Work Index Formula-Equation. See this useful summary Table of Bond Work Index by Minerals 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 umBond Work Index Procedure and Method,Cleaning and Storing of Ball Mill Charge after the Bond

• ### bond work index tests-grinding solutions ltd

Bond Rod Mill Grindability Test. Grinding Solutions can carry out Bond Rod Mill Work Index tests to determine the energy requirements for milling ore in a rod mill. The test requires a minimum of 20kg of -12.5mm material. Closing screen sizes typically range from 4.75mm to 212µm. Abrasion Index Test

• ### (pdf) a quick method for bondwork indexapproximate value

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

• ### mineral processing design and operation| sciencedirect

Appendix B-2 - Bond Work Index Test Procedure for Determination of the Bond Rod Mill Work Index. Pages . 683-685. Select Appendix B-3 - Rod Mill Power at Mill Pinionshaft (Horsepower) Book chapter Full text access. Appendix B-3 - Rod Mill Power at Mill Pinionshaft (Horsepower) Page . 686

• ### testwork: bond ball mill work index- sagmilling.com

The 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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