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### Model Morrell SS SAG

The SMC test stored in the DWT testwork table SMC is a Drop Weight Test Bond ball mill work index The method requires all the parameters of the ball mill work index test to be filled in Ball mill Wi test closing screen size umclosing µm Ball mill Wi test product size P 80 µm Ball mill Wi test feed size F 80 µm

Get Price### Test The Grindability of Your Favourite Elements

Apr 08 2019 A test sample is stage crushed to a 3.5mm maximum feed size and compacted into a 700cc tube Once properly measured the sample is placed in a universal F.C Bond Ball Mill to accurately calculate the Bond Work Index of the material After a set number of revolutions the sample is removed and screened over a 100 mesh sieve.

Get Price### Bond Work Index Tests

The Bond Ball Mill Work Index BBWi test is carried out in a standardised ball mill with a pre defined media and ore charge The Work Index calculated from the testing can be used in the design and analysis of ball mill circuits The test requires a minimum of 10kg of sample that has been stage crushed to 100 passing size of <3.35 mm.

Get Price### Grindability Laboratory and Analysis Technology Pilot

Determining the Bond work index is a standardized method for characterizing the comminution performance of mineral samples CEMTEC uses this method for designing rod and ball mills The comminution performance is just like the desired comminution step and the production capacity crucial for determining the required mill size.

Get Price### Bond Method For Ball Mill Work Index Test

Bond Ball Mill Index Test Jktech Jul 30 2020 An improved method using less mass compared to the Bond Ball Mill Work Index test The JK Bond Ball Mill JKBBM test is a locked cycle grindability test conducted using a standard laboratory Bond Ball Mill with the same steel ball charge and material feed size 100 passing 3.35 mm as the Bond Ball Mill Work Index test.

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### COMMINUTION Fred Bond low res

The Bond Work Index approach is the standard method of selecting ball mills to grind from about 3 mm to 25 µm provided that correction factors are used if necessary The power prediction is fairly accurate for devices that produce a product with a size distribution parallel to that of the feed It does not work

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### Article Evaluation of the Geometallurgical Indexes for

Dec 08 2019 A simulated test method for Bond ball mill work index BWI was used to perform the comminution test The results showed BWI values vary from 5.67 kWh/t to 20.21 kWh/t Examination of the possible correlations between BWI and the geological features

Get Price ### Bond Work Index BWI Test

Oct 18 2018 Bond Work Index BWI Test Celtest have the capability to carry out the Bond Work Index BWI Test in accordance with EPRI Report CS3612 FGD Chemistry and Analytical Method Handbook Volume 2 The BWI is used to estimate the required mill power per ton of product Specific Energy The specific energy requirements and the desired production

Get Price### PDF A quick method for Bond work index approximate value

Nov 01 2016 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 comminution plants designing Determining the Bond work index value is quite complicated timeconsuming and requires trained operating personnel and therefore is subjected to errors A quick

Get Price### Testwork Bond ball mill work index

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 The

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### Bond Efficiency GMG ICE v1 r04 Determining the

Where WioACTis the Actual Operating Bond Work Index kWh/t W is the specific energy input kWh/t P80 is the 80 passing size of product µm and F80 is the 80 passing size of circuit feed µm 2 Calculate the Standard Circuit Bond Work Index WiSTD for

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### THE BOND WORK INDEX OF LIMESTONE AND ANDESITE

The Bond work index determination according to the standard Bond s test is done on all these samples with compara tive sieve size of 74 105 and 150 microns The Bond Work Index is calculated using the formula Bond 1961 √ √ 1 where W i Bond work index kWh/t P c test sieve mesh size µm

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### DETERMINATION OF THE BOND’S WORK INDEX OF

The work index expresses the resistance of the material to grinding It represents the kilowatt hours per tonne required to reduce the material from theoretically infinite feed size to 80 passing 100μm Wills and Napierpercent Munn 2006 Bond devised several methods for predicting ball mill and rod mill energy requirements and

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### Comparison of UCS to Bond Work Indices

FIGURE 8 ROD MILL/BALL MILL WORK INDEX RATIO v UNCONFINED COMPRESSIVE STRENGTH 100 200 300 400 UCS MPa 0 0.5 1 1.5 2 WiRM/WiBM metric Siddall et al 1996 identified the ratio of Bond rod mill Work Index and ball mill Work Index as being indicative of an ore’s compentency Figure 8 plots this ratio versus UCS no trend is apparent

Get Price ### PDF A quick method for bond work index approximate value

A quick procedure with two grinding cycles for the determination of the Bond work index approximate value is exactly the same as in the first two grinding cycles of the standard Bond test and

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### Correction of Bond Ball Mill Work Index Test for Closing

Dec 07 2018 The test work program was carried out on those five ore samples obtained from the copper porphyry orebodies Total of 38 Bond work index tests including duplicates were done Standard Bond ball mill test procedure were carried out on

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

Oct 15 2015 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

Get Price### SAGMILLING.COM

Correction of Bond Ball Mill Work Index Test for Closing Mesh Sizes It is commonly known that one must run the Bond ball mill work index test such you pick a

Get Price### Alternative Ore Grinding Methods

Kinetic grinding test approach to estimate the ball mill a simple yet practical alternative for the standard Bond method Keywords work index Bond method kinetic grinding test grindability ball mill Introduction The standard Bond 1952 1961 method is widely used in the course of design selection scale up energy calculation and performance evaluation of grinding circuits

Get Price### Procedure for determination of ball Bond work index in the

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

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### HIT a Portable Field Device for Rapid Testing at Site

laboratory tests typically Bond ball mill Work Index and SMC test / JKDWT A b Bond 1961 Morrell 2004 Due to budgetary constraints this has curtailed the collection of sufﬁ cient number of BMWi or A b measurements to allow the inherent variability to be adequately quantiﬁ ed for direct

Get Price ### Testwork Bond rod mill work index

Test name Bond Rod Mill Work Index Abbreviation Alternate Forms Wi RM RWI Typical F 80 size Typical P 80 size 11 000 µm 900 µm Models Bond models The Bond rod mill work index is not as common as the Bond ball mill work index and there are two different variations on the mill apparatus The SAGMILLING.COM models expect a mill with a wave

Get Price### Determination Of The Bond Work Index Using An Ordinary

The 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 The simplified test method described in this paper which is used at Anaconda Research Center to approximate the work index is an alternative procedure to

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### Kinetic grinding test approach to estimate the ball mill

a simple yet practical alternative for the standard Bond method Keywords work index Bond method kinetic grinding test grindability ball mill Introduction The standard Bond 1952 1961 method is widely used in the course of design selection scale up energy

Get Price ### SAG Variability Testing

A condition of using the SVT equation in the calculation of the W SVT is that the initial fines <1.7 mm in the SAG mill feed must be no greater than 40 If the fines account for more than 40 of the feed the test must be brought to 80 passing 1.7 mm rather than 60 passing 1.7 mm i.e the full SAG test must be performed to generate a reliable test result.

Get Price### Energy Benchmarking

A number of samples were taken from the SAG mill feed belt and subjected to SMC Tests and Bond ball mill work index tests Note that the Bond tests were conducted using 150 microns as the closing screen size so that the final product size from the tests was similar to

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### Morrell Method GMG ICE v01 r01 Morrell method

ization data generated from the SMC Test see Annex A and the Bond Ball Mill Test Work Index WiBM GMG 2016a and the Morrell equations and their application see Annex B A worked example is provided in Annex C 5 SCOPE The Morrell method can be used to predict the specific energy of comminution circuits where such circuits include

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### Improved characterisation of ball milling energy

The Bond Ball Mill Work index BBWi is the industry standard procedure for assessing the grindability of ores The test involves conducting a locked cycle grinding test using ond’s standard mill design The locked cycle test enables a batch process to emulate the grinding behaviour of a continuous mill with a 250 recirculating load.

Get Price ### Standard Bond Ball Mill Grindability Test Method Procedure

Dec 14 2015 Here is the old Allis Chalmers Bond Work Index Grindability Test Procedure The standard feed is prepared by stage crushing to all passing a 6 mesh sieve but finer feed can be used when necessary It is screen analyzed and packed by shaking in a 1000 cc graduated cylinder and the weight of 700 cc is placed in the mill and ground dry at 250

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### RELO

BOND BALL MILL WORK INDEX TEST REPORT Sample Name Limestone density2 65 g/cm3 Test Procedure Bond Work Index Determination Method Test Equipment Standard Bond Ball Mill Mill size D X L = 305 x 305 mm Mill volume 22.3 dm3 Lining of the mill smooth steel Rotation speed 70 rpm 85 of ncrit Grinding Media ReloC bodies

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### Work Index Determination for High Pressure Grinding Rolls

shortcomings the test was changed to a locked cycle technique as described below LOCKED CYCLE TESTS The preferred test procedure is a locked cycle test akin to the Bond Ball mill work index determination The first cycle starts with minus 6 mesh ore removed since it is believed that the fines content can fill most of the voids allowing

Get Price ### Development and experimental validation of the

Jul 01 2017 Also for the SGS Modbond grindability test an open circuit dry batch test was used for estimating the Bond work index after calibration against the standard Bond ball mill test Kosick and Bennett 1999 The test itself involved the Bond ball mill and reduced samples sizes of 1.2 kg pre crushed to minus 3.35 mm.

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