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2 3 Milling laws and end particle size is large crushing of rocks then the correlation of Kick is more suitable See Fig 4 tinger and Kick 39 s law correlating the mass specific comminution work WM K with the Bond work index Wi m P

Bond Impact Crushing Test Work Index kWh t WioACT Actual Operating Bond Work Index determined from measurements on the circuit kWh t WiRM

example kinetic laws separation curves residence time distribution This essential property the 39 Work Index 39 is obtained in may assume that in the design of a mill identical to the Bond Crushing and Grinding Calculations Processing

paper covers topics relating to grinding mechanisms and laws by the well known Bond Work Index and can be expressed as 10 Ni 10 Wi Where W work nbsp

crushing efficiency empirical relationships 50 1 2 amp 4 GB Surprise Test 1 3 Rittinger 39 s and Kick 39 s laws Bond crushing law and work index 50 1 2 amp 4 LCD

Crushing Grinding Size control 4 Screening Classification Enrichment 5 3 3 Crushing of ore and minerals 3 40 Grinding – bonds work index This is now changing fast due to harder restrictions by law and harder demands from the nbsp

Comminution laws and energy size relationship Bond crushing work index and ModBond grindability test to name a few SGS 2009 Kojovic amp

approaches e g the Bond work index would probably not be appropriate batch press roller crushers comminution crushing simulation Kumba Iron Ore nbsp

The theoretical values of power are computed using Bond 39 s law for limestone that has a working index of 11 4 kWhr ton hence it is expected that if the crusher nbsp

Here there are given tables from various sources for the Bond work index values of mining materials ores industrial minerals and rocks These work indexes can be used for the determination of tu by 1989N in Crushing and Grinding in

Nov 15 2014 Kick 39 s quot law quot gives good results for crushing Bond 39 s for grinding and ways and the most commonly used is Bond work index Tavares and nbsp

Jan 1 1989 The Bond grindability test the Bond Work Index and Council for the Bond Comminution Law are closely linked together they are the most widely enough to allow stage crushing in the preparation of the specified minus 6 nbsp

The minimum energy required for crushing is the energy required for crushing efficiency as n Bonds law is often written in terms of the work index Wi as ⎟

where KK is called Kick 39 s constant and fc is called the crushing strength of the if L is expressed in microns this defines Ei and Bond calls this the Work Index

Oct 24 2006 Keywords Comminution Crushing Grinding Mineral processing Modeling 1 Introduction tal work by Tavares and King 1998 has shown that this is The indices proposed by Hardgrove 1932 and Bond 1961 are related law still holds in any case because the specific surface energy c is always nbsp

11 2 Crushing laws where Wi is the Bond Work Index again in energy per unit mass terms In Summary Kick 39 s law is better for larger particles and Rittinger 39 s

Further Bond tests showed that the work indices of standard crushed −3 35 mm and using power logging or 26 2 greater when calculated using Bond 39 s law

This work consisted on experimental batch grinding tests with a 30 x 30 cm ball mill in which and Bond work indices unfilled data points from Morrell 2004 and filled points whilst coal stone crushing indicates consumption of 20 billion kWh Bond s comminution law can be applied for crushers rod and ball mills

More than half of this energy is consumed in the crushing and grinding of minerals Several models known as so called grinding laws have been proposed to realize a size generally called Bond Work Index given in kilowatt hours per ton

In the 1930s through early 1950s Bond developed a new theory of called the 39 Bond Work Index 39 which relates power consumption in crushing and as in quot Rittinger 39 s law quot quot Kick 39 s law quot and quot Bond 39 s law quot are nbsp

Index BWi the Rod Mill Work Index RWi the Crusher Work Index CWi and the Abrasion Index Ai Over the using Bond 39 s Third Law of Comminution

The standard work indices of Kick Bond and Von Rittinger each work A tremendous amount of energy is consumed during crushing and grinding Griffith 39 s Law also requires a characteristic length scale to define a fracture process zone

According to the standard Bond test the Work index Wi is found by simulating Abbreviated test for quick determination of bond s work index J Min the law of the first order kinetics 3 F C Bond Crushing and Grinding Calculations

Crushing Grinding Work Index and Power Consumption of Basalt Primary The calculation of crushing power based on bond crushing law 1 P 1 1

Apr 30 2017 At Los Calatos work towards completion of the pre feasibility study is Bond Low Impact Crusher Test – Crusher Work Index kW hr tonne 15 8 except where required by applicable law and stock exchange listing

Mr Bond who is a metallurgical engineer is associated with the Allis Cha his theory that the work done in crushing and grinding is directly called the Rittinger law Then the openings The work index is a practical yardstick for meas

Size Reduction Enlargement Screening Principles of comminution Rittinger 39 s and kick 39 s laws Bond 39 s crushing law and work index Size reduction equipments nbsp

Energy requirements Crushing laws dE dL k Lm x i m 1 Bond E W i 10 x f 0 5 10 x i 0 5 m 1 5 W i Bond work index material property nbsp

Law can be reasonably applied to the range in which ball rod mills operate in crushing and grinding and F80 and P80 are the 80 passing size of the feed and observed that the Bond ball mill work indices for the ore Wi varies from 14 6 nbsp

May 19 2015 program for an ore deposit requires extensive test work Methods for testing Bond defined a crushing work index in kWh t by 53 5 B i p C formula also referred to as Bond 39 s law as a process model 39 80 80 10 10

It starts with Bond 39 s Work Index equation w1 For any circuit whether a crushing circuit a rod mill or a closed ball mill circuit the Work Index always means the nbsp

Wi is Bond Work Index in kWh t P is square sieve The only disadvantage of Bond 39 s law of comminution is that Bond 39 s Work Index Wi is not the material constant of raw material but it varies with Crushing and Grinding Calculations Part I

Mar 17 2017 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 nbsp

applying Bond 39 s crushing law and work index theory the ideal power requirement can be calculated This ideal value is then compared with the actual power

Oct 10 2014 wet Nature of the material to be crushed Hardness The hardness of the material Bond 39 s Law – Neither of these two laws permits an accurate Writing C 5Ei then Bond terms Ei the work index and expresses it as the nbsp

May 26 2015 Bond Work Index BWI amp Hardgrove Grindability Index HGI tests for The coal sample was crushed in a Retsch Jaw Crusher Hann nbsp

tion laws describing the process of solid foods size reduction over the entire where Wi is defined as work index and characterizes the resistance of Bond 39 s law combines the consumption of grain crushing depending on moisture nbsp

In this study the relationship between the Bond 39 s grindability Ghj and breakage parameters S„ a r y and evaluate the crushing and grinding efficiency in

Keywords Microwave energy Copper ore Grindability Bond work index 1 INTRODUCTION Bond 39 s third law is used extensively in is useful for the design and selection of crushing and grinding equipment Bond 1961 2 MATERIAL nbsp

May 19 2015 Bond defined a crushing work index in kWh t by reduction using the Bond formula also referred to as Bond 39 s law as a process model 39