Table of Bond Work Index by Minerals This Table of Ball Mill Bond Work Index of Minerals is a summary as tested on around the world sample You can …

Comparison of UCS to Bond Work Indices Alex Doll Alex G Doll Consulting Ltd Edmonton Canada Derek Barratt DJB Consultants Inc North Vancouver Canada Ken Wood Fluor Mining Minerals Vancouver Canada Abstract Unconfined Compressive Strength UCS is a commonly used rockmass strength measurement used by

Apr 20 2012· Insmart Systems Bond Work Index Ball Mill INSMART SYSTEMS Hyderabad Insmart Bond Work Index Ball Mill work index Mill A Super Simple Home-Made Ball Mill or Rock Tumbler - Duration

The JK Drop Weight Test is an industry standard for use in characterising ore under AG SAG milling conditions The JK Drop Weight Test provides ore specific comminution parameters which are used in the JKSimMet software to analyse and or predict crusher and AG SAG mill performance

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Bond F C Crushing Tests by Pressure and Impact Trans AIME Vol 169 1947 pp 58-66 Bond 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

and the Bond Work Index BW i The Drop Weight and Bond Work Index parameters are required to model the crushing and grinding circuits Therefore the use of the Point Load Index allows sites to characterise their rock properties quickly and easily while still making use of the sophisticated grinding models that are available The PLI data can

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comminution plants designing Determining the Bond work index value is quite complicated time-consuming and requires trained operating personnel and therefore is subjected to errors A quick method for the Bond work index approximate value determination which is based on the first order grinding kinetics is presented in this paper

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Comparison of Ore Hardness Measurements for Grinding Mill Design for the Tenke Project to T80 1 7 mm and Bond Work Index on SAG ground ore To data 63 SAGDesign tests have been done and this allowed the Tenke Comparison of Ore Hardness Measurements for Grinding Mill Design for …

index by calculation is almost matching with measured Bond s work index The Bond s work index of the above rock samples calculated from the Hardgrove index value has shown a variation from 7 7 to 10 3 kWh sh t A correlation is found between the friability value and work index

grinding Characterization of rocks for selection of crusher can be done in different ways and the most commonly used is Bond work index Tavares and Carvalho 2007 Holmes 1957 proposed a modification of Bond s equation with the additional coefficient that depends on the properties of rock

one is Bond s grindability test which has been a widely accepted approach and the second one is Hardgrove s index generally used for coal Stamboliadis et al 2011 Gamal 2012 The Bond work index is regarded as size reduction resistance It can therefore be presumed that the BWI is correlated to the physical and mechanical

8 The bond work index for a mesh-of-grind of 200 mesh for a rock consisting mainly of quartz is 17 5 kWH ton How much power in kW is needed to reduce the material in a wet-grinding ball mill from an 80 percent passing size of 1100 micrometer to an 80 percent passing size of 80 micrometer at a capacity of 10 ton per hour 9

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116 Crushing and classification ∝ − 3 i 5 2 i 3 f 5 2 f x x x E giving = − f i 10 10 x x E W i 11 5 where Wi is the Bond Work Index again in energy per unit mass terms The index is defined as the energy required to crush from infinite size down to 100 µm hence the 10 inside the brackets Bond s Work Index values in kWh per short

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A New Approach to the Calculation of Work Index and the Potential Energy of a Particulate Material factors have been adapted by Bond 5 The present work is an effort to show that the devia- tion of the W i tained for different minerals and rocks ground under dif- ferent experimental conditions 2 Experimental Procedures

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consists of squeezing pieces of rock diametrically between two hardened steel cones The test set-up is shown in Figure 1 For these tests rock pieces must have a length at least 1 4 times their diameter Figure 2a The point load index Id is equal to where P is the load at rupture and D is the core diameter Rock specimens break since tensile

The value of the bond work index of the above samples has shown a variation from 10 8 kWh ton-1 for bauxite high abrasion value and low compressive strength to 20 4 kWh ton-1 for granite low abrasion value and high modulus of elasticity

Fred Chester Bond June 10 1899 January 23 1977 was an American mining engineer A graduate and former professor of the Colorado School of Mines he …

Basically Bond s Third Theory of Comminution has two functions for determining the energy for comminution work index and particle size reduction The work index function is a hardness factor or a degree of hardness and or toughness of the material being treated and expressed in …

correlation between the abrasion value X2 and work index Wi is found to be Wi = -1 8 Ln X2 11 5 with correlation coefficient of 0 80 KEYWORDS Bond work index ± Mechanical properties of rocks ± Grinding energy- Crushing resistance 1- INTRODUCTION Comminution in a mineral processing plant or mill involves a sequence of crushi ng

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Dec 10 2016· In general Bond s work index is used to determine the grinding efficiency and also to calculate the power requirement The process is very time consuming and it requires skilled labor and specialized mill A systematic investigation was carried out to predict Bond s work index using simple field measurable properties of rocks

and the Bond Work Index BW i The Drop Weight and Bond Work Index parameters are required to model the crushing and grinding circuits Therefore the use of the Point Load Index allows sites to characterise their rock properties quickly and easily while still making use of the sophisticated grinding models that are available The PLI data can

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