A New Approach to the Calculation of Work Index and the Potential Energy of a Particulate Material Ball Mill Batch Process The mill dimensions D × L are 0 204 × 0 158 m and it tests which is similar to the Bond test but with the exist- ing mill of known power

of the Bond ball mill work index test was needed if the industry was to improve upon current practice John an experienced pilot plant manager and feasibility engineer experimented with a bench scale SAG test protocol He brought his findings to the attention of MinnovEX Technologies Inc in 1994 and the Starkey SAG test evolved

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

Outotec Mergan method is faster than the Bond ball mill test and requires less sample material However the Mergan method gives grinding energy consumption which can be used to calculate Mergan work index but this Mergan work index differs from the Bond work index Therefore it is needed to analyze if the Mergan work index correlates

Mill grindability test requires a 5 lb 2 kg sample and produces a direct measured specific energy net Hp-hr t to grind from the design feed size to the required product size The second test a Bond Work Index determination results in a specific energy value net Hp-hr t from an empirical formula

Kinetic grinding test approach to estimate the ball mill work index 343 The W i parameter is obtained from Bond s ball mill grindability test Bond 1961 This test is performed according to the standard Bond procedure which proposed model is presented in Eq 1 This standard grindability test …

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 The test is a closed-circuit dry grindability test performed in a standard rod mill

The aim of this study was to develop a new method for assessing the Bond work index in a ball mill BBWI which is based on a first order kinetics present in the Bond ball mill for grinding mineral raw materials Austin et al 1981 Ahmadi and The Bond work index determination according to the standard Bond test was done

commercial grinding conditions for the test in a 0 5 m diameter SAG mill In the 2009 database SAG pinion energies to grind from F80 152 mm to T80 1 7 mm vary from 1 4 to 34 kWh t and Bond ball mill work index values vary from 6 to 24 kW t for the same ores Project design tonnages varied from 200 to 150 000 t d SAG mill sizes varied from 10 ft

Two shortened test procedures for estimating the Bond ball work index are compared for suitability of use on Zambian DRC-type copper cobalt ores The first procedure is based on a batch milling test while the second procedure is based on a limited locked-cycle test Both procedures were conducted using a standard Bond test mill INTRODUCTION

Download PDF Download Share Export Advanced The Bond ball mill grindability test is run in a laboratory until a circulating load of 250 is developed It provides the Bond Ball Mill Work Index which expresses the resistance of material to ball milling This happens after 7 10 grinding cycles which shows that the procedure is a lengthy

The Bond ball mill grindability test is run in a laboratory until a circulating load of 250 is developed It provides the Bond Ball Mill Work Index which expresses the resistance of material to

Drop Weight Index DWi and the coarse ore grinding index M ia Test data from the Bond ball mill work index test is used to calculate the fine grinding index M ib The M ia and M ib indices are used to calculate specific energy for the coarse W a and fine W b components of the total grinding specific energy at the pinion W

by Hazen Research Inc HRI to obtain the JK parameters using the JK Drop Weight Test standard 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

using the Bond equation 1961 For every Bond Rod Mill Work Index test carried out at JKTech a standard report is issued The report details the Bond test procedure method and presents the results including F80 P80 Grindability and Work Index Further interpretation of the results is available if …

bond ball mill work index test standard pdf We specialize in crusher and milling machine production and research and development Kinetic grinding test approach to estimate the ball The aim of this study is to develop a new approach to estimate the Bond ball mill work index BBWI using a combination of Bond standard mill and initial test

world It shows that the ball mill work index is normally distributed with an average of 14 6 and a median of 14 8 kWh t bOnd rOd mill GrindAbility The Bond Rod Mill Grindability Test is performed similarly to the ball mill test The feed sample is stage-crushed to ½ and the test is run under a 100 circulating load As in the ball mill

grindability on the Bond ball mill grindability G hg and work index W are investigated based on four samples of natural amorphous silica In the experimental studies the relationships between the Bond work index with circulating load and test sieve size were examined I INTRODUCTION Currently silica fume is widely used as a

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

Grinding in ball mills is an important technological process applied to reduce the the work index of the material the mill shaft power and Standard sieves are used to determine quantitatively the size of the particles in each size class In the theory of breakage of solids the fragmentation process is

BENCH SCALE COMMINUTION TEST WORK qBond Work Index Testing Bond Ball Work Index Bond Rod Work Index Bond Crushability Work Index Bond Abrasion Work Index qJK Tech Testing JK Drop weight Test SAG Milling Comminution Test SMC COMMINUTION PILOT PLANT qAG SAG Pilot Milling Mill dimensions Ø1 7m x 0 6m length Typical throughput 0 5 -3 5 t h

Oct 12 2018· Relation of Bond ball mill work index and rod mill work index Bond Testwork Internationally accepted mineral metallurgical standard test procedures to …

Figure 1 Uniaxial compression test machine 3- STANDARD BOND TESTS The Bond s standard ball mill is used to determine the work index value of differ ent samples 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

The Bond ball mill work index test is thought to be additive because of its units of energy nevertheless experimental blending results show a non-additive behavior 18 The SPI R value is known not to be an additive parameter however errors introduced by block kriging are not thought to be significant

2 4 Bond Ball Work Index Test A grinding mill F305 mm 305 mm was used for the Bond ball mill work index test 18 21 This ball mill was ﬁlled with 285 steel balls total weight of 20 125 kg at an operation speed of 70 rpm The feed sample was prepared via crushing and sieving giving rise to a size smaller than 3 35 mm

work index covering grinding of fine particles is labelled M ib Morrell 2008 M ia values are provided as a standard output from a SMC Test Morrell 2004a whilst M ib values can be determined using the data generated by a conventional Bond ball mill work index test M ib is NOT the Bond ball work index M ic and M ih values are also

porphyry copper deposit applying mineralogical approach at Luleå University of Technology The presentation of this work has been done on 19th June 2017 at Luleå University of Technology This work is a part of PREP project Primary resource efficiency by enhanced prediction

and aWork Index of11 5kWh t wasfound Not only to15 6kWh t astheapertures ofthelimiting screening wastheWork Index reduced toamorerealistic figure by werereduced from425to150 m TheWork Index then themodified procedure butthenumber ofcyclesrequired increased abruptly to44 2kWh t andnofewerthan44