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• the bond ball mill work indices determinations gave reasonably reproducible results • significant variation was observed in the measurement of the bond rod mill work index on at least one sample tested and • large variations in abrasion index and crushing work index were due to variations in the test method across the laboratories

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In the Modbond grindability test an open circuit dry batch test run is used for estimating the work index after calibration against the standard Bond ball mill test 53 .

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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

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May 01 2013 · Hardgrove grindability index (HGI) WI work index by bond andHGI tests serving are used to determine thevalue of grindability. The Hard grove method ismostly used to determine the grindability ofcoal but also in determining grindability ofother raw materials. The sample left in the ball mill is then collected along with anypowdered

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4. Methods 4.1. Bond ball mill testing. Generally Bond work index for mill dimensioning and controlling is measured by grinding a feed material of <3.36 mm particle size under standardized conditions in a so-called Bond mill (D L = 305 mm 305 mm).

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Bond Ball and Rod Mill Work Indices The work index is a measure of the resistance of an ore to grinding. It is used to calculate mill power and the size of grinding media required. The ball and rod mill work indices are determined by cyclic grinding tests in standard mills with standard grinding charges.

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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. of the standard Bond Ball test. They

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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

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Ball 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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Bond crushing law in ball mill mayukhportfoliocoin. original document english (pdf 2660kb) the third law states that the net the test work involved bond ball mill testing rod milling low is applicable for crushing rittinger s equation may be used. Read More Bond Grinding Work Index For Quartz Stone. Bond Work Index Formula-Equation

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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

Get Price### A Comparison of Test Procedures for Estimating the Bond

Both procedures were conducted using a standard Bond test mill. INTRODUCTION The Bond ball work index is widely used in the field of minerals processing as an indicator of ore grindability. The work index is determined by means of a locked-cycle test

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Bond Index Test Test conducted on a Bond Index testing mill (Bico-Braun USA) 700ml of sample milled for 100 revolutions. New number of revolutions is calculated to produce fines equal to 1/3.5 of the total charge of the mill. The Bond Work Index W i expresses the resistance of the material to

Get Price### DEVELOPMENT OF COMMINUTION TEST METHOD FOR

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

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In this paper . ball mill axial test procedure Ball Joint Testing . Get Price And Support Online test method for bond ball mill work indexlearning . Bond Work Index Procedure and MethodTraduire cette pageThis Grindability Test or Bond Ball Mill Work Index Procedure is used to determine the Bond Work Index

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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 Shahsavari 2009).

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Know More Hardgrove grindability index (HGI) May 01 2013· Hardgrove grindability index (HGI) WI work index by bond andHGI tests serving are used to determine thevalue of grindability The Hard grove method ismostly used to determine the grindability ofcoal but also in determining grindability ofother raw materials The sample left in the ball mill is then collected along with

Get Price### What Can Go Wrong in Comminution Circuit Design

• the bond ball mill work indices determinations gave reasonably reproducible results • significant variation was observed in the measurement of the bond rod mill work index on at least one sample tested and • large variations in abrasion index and crushing work index were due to variations in the test method across the laboratories

Get Price### Bond Index Hardgrove Grindability Index Tests for

Bond Index Test Test conducted on a Bond Index testing mill (Bico-Braun USA) 700ml of sample milled for 100 revolutions. New number of revolutions is calculated to produce fines equal to 1/3.5 of the total charge of the mill. The Bond Work Index W i expresses the resistance of the material to

Get Price### Comparison of ore hardness measurements for grinding mill

Aug 19 2009 · Six samples were tested by Hazen Research Inc. to obtain the JK parameters using the JK Drop Weight Test standard Bond crushing and rod mill work indices abrasion indices and by Dawson Metallurgical Laboratories Inc. for Bond Ball Mill Work Index tests using crushed feed and SAGDesign Tests patented by Outotec.

Get Price### 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.

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Nov 23 2012 · The wet ball mill test method has been in use for aggregate quality testing in various forms for a number of years and for a variety of aggregate end-use purposes Testing method for ball millsUS Patent 7197952 Description. The Bond ball mill test is designed to predict power in wet ball mill grinding The first step of the testing

Get Price### A New Approach to the Calculation of Work Index and the

The mill power is = 22.5 Watts calculated by (6). Fi- P nally the product is wet screened to find the size d80. 2.4. Rod Mill Semi Continuous Process The same mill is used for the semi continuous grinding tests which is similar to the Bond test but with the exist- ing mill of known power. After time the mill product is t

Get Price### A Comparison of Test Procedures for Estimating the Bond

Both procedures were conducted using a standard Bond test mill. INTRODUCTION The Bond ball work index is widely used in the field of minerals processing as an indicator of ore grindability. The work index is determined by means of a locked-cycle test

Get Price### - Test methods for characterizing ore comminution behavior

•-Association index •Modal mineralogy •Test methods Starting from the dimensions of the Bond ball mill a modified test method was For the future work these tests will be extended to other ore types in order to investigate the effects of mineralogy and to include mineral liberation in

Get Price### Investigation into the applicability of Bond Work Index

Bond Work Index (BWI) Hardgrove Grindability Index (HGI) tests for biomass coal. • BWI can predict the potential for mill choking of biomass in a tube and ball mill. • HGI is a poor method of predicting grindability of biomass in vertical spindle mills. • Pellets should be composed of pre-densified particles close to the target size. •

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2020-03-02 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. The SPI(R) value is known not to be an additive parameter however errors introduced by block kriging are not thought to be significant .

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2.4.1. Bond test 18 2.4.2. Variations of the Bond test 18 2.4.3. Evaluation of grindability tests 18 2.5. Pilot and bench-pilot scale tests 19 2.6. Indirect methods for determining comminution behavior 20 2.7. Summary and conclusions 20 3. Linkage between comminution test work and process modeling 22 3.1.1. Size reduction models 23

Get Price### Rapid determination of Bond rod-mill work index by

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.

Get Price### COMMINUTION 10sagdesign

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

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Rapid determination of Bond rod Magdalinovic and Cumpujerovic showed the fact that an approximate value of the ball-mill work index can be determined by doing just two grinding tests Chongbo and Bingchen studied away to simulate the calculation method of the Bond rod-mill work index On the basis of their research a new method was developed to

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Test Method For Bond Ball Mill Work Index. Numerically the work index is the energy required in kwht to reduce a given material from theoretically infinite feed size to 80 passing 100 micronshe work index of a particular material is determined in the laboratory by conducting the standard bond grindability test bond developed separate tests for the rod mill and the ball mill.

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