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 12 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
Get PriceLABPILOT PLANT EQUIPMENT Bond Ball Mill This 12 x 12 ball mill is universally used for grindability testing and determination of the Bond Work Index
Magdalimovic1989 Numerically the work index is the energy required in Kwhshort ton to reduce a given material from theoretically infinite size to 80 passing size of 100 microns Onemine 2009 The determination of work index using modified Bonds method can be compared to method of determining it by Berry and Bruce 1966
The mill power is 225 Watts calculated by 6 Fi P nally the product is wet screened to find the size d80 24 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
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 2006This 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
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
Mill Ball Mill Closed circuit crushing to 16 mm Open circuit 8 dia rod mill to 1 mm Closed circuit 8 dia ball mill to P80 um The ore Test Work Index Circuit Operating Work Index 9 The Standard Bond Circuit Coarse Ore Bins Fine Ore Bins Screen Crushing Screen Classification Rod Mill Ball Mill THIS IS THE REFERENCE BASIS FOR ALL WORK
new crack tip length produced during breakage Bond developed the well known Bond work index which is an indicator of a materials resistance to crushing and grinding Each of these theories was useful in the design and scale up of ball mill operations however they told little of the expected size distributions and most
Bond Ball Mill Index Test BBMWI A BBMWI 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 The BBMWI is a measure of the resistance of the material to crushing and grinding It can be used to determine the grinding power required for a given throughput of material under
on this test globally for design and optimisation Comparative testing program for the original Bond Ball Mill Test showing range of results against ususal range of BBMWi values measured The JKBBM test requires less material compared to the original test JKTech recommends 5 kg for test work compared to 10 kg for the original test Similarly the
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
Gates JD Giblett A Dunne R 2012 Prediction of plant ball mill media wear rates from laboratory ball mill test data Comminution 12 Minerals Engineering Metal wear in crushing and
The grinding jar of the Bond Index Ball Mill measures 12 x 12 and has wellrounded corners The grinding jar for the Bond Index Rod Mill is 12 x 24 in size and has a waveshaped design At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill
An alternative approach to determine the effect of closing screen size on the Bond ball mill work index BW i in the absence of extensive test work is to use computer simulation The batch grinding process has been modelled using the sizemass balance approach Austin 37 Chapter 11 and if we can do this then we can effectively simulate the Bond ball mill work index test
Apr 01 2019 La India Vein Set ores were noted as harder than usual with the Bond Ball mill work index determinations ranging from 175 to 219kWht Grindrecovery test work indicated that a grind of 80 passing P80 75 microns will be required
Mill Type Overview Three types of mill design are common The Overflow Discharge mill is best suited for fine grinding to 75 106 microns The Diaphram or Grate Discharge mill keeps coarse particles within the mill for additional grinding and typically used for grinds to 150 250 microns The CenterPeriphery Discharge mill has feed reporting from both ends and the product discharges
SAGDesign testing provides SAG pinion energy grindability in kWht to within 5 from 152 to 17 mm and Bond Ball Mill Work Index on SAG ground ore from the SAG test on the same sample Starkey Associates uses the patented SAGDesign technology to calculate accurate mill sizes from measurements on a clients own ore samples
The Bond Abrasion Test determines the Abrasion Index which is used to determine steel media and liner wear in crushers rod mills and ball mills Bond developed the following correlations based on the wear rate in pounds of metal wearkWh of energy used in the comminution process
Mill grindability test requires a 5 lb 2 kg sample and produces a direct measured specific energy net Hphrt 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 Hphrt from an empirical formula
The Bond Ball Mill Grindability Test is a lockedcycle laboratory grinding test It provides the Bond Ball Mill Work Index which expresses the resistance of a material to ball milling 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 scaleup The test has
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
The typical loglog plot obtained from Bonds ball mill test Note Tyler sieve numbers on the x axis ranging from 6 to 200 mesh represent a size range from 335 to 0075
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 12 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
Bond Ball Mill Work Index Grindability Tests YouTube recommended that the rod mill work index is used for the bond Fo the optimum feed size calculation and the highest 1 10 100 1 10 100 1000 10000 100000 Cum Passing microns WORSLEY ALUMINA TEST 550 14 X 20 ROD MILL AND 14 X 23 BALL MILL CIRCUIT 30 AUG 04 ROD MILL DISCHARGE BALL MILL DISCHARGE DSM
This test can be conducted in several methods One method employs a ground loop impedance tester This tester places a limited fault current approximately 20 amperes on the circuit under test for a limited time approximately 20 milliseconds by measuring the voltage drop across a reference resistor the tester indicates the ohms value of the
Apr 03 2007 In the second step of the testing method the test is based on the Bond ball mill The product from the first step is then used for determination of the required ball mill energy for the secondary grinding stage to reach the target grinding size The empirical formula to calculate Bond Mill Work Index BWi is presented in the equation 2
ODOT LABORATORY TEST METHOD S WITH AASHTO ASTM AND MFTP TEST REFERENCES Description of Test TM 503X EPA Test Method 1311 E 70 T 260 T 194 T 178 C 1084 T 260 T 213 A 428 T 65 A 90 TM 580X D 1475 D 2697 D 50 D 2369 D 562 TM 591X D 562 D 711 D 1475 D 1214 TM 613 TM 614 T 97 C 78 C 192 Making and Curing Concrete Test Specimens in the Lab
bond crushing law in ball mill bonds crushing law and work index Bond Impact Crushing Work Index Test 80 The Bond lowenergy impact crushing work index more informally the Bond crushing work index is not as common as the Bond ball mill work index and it
The SPI test in combination with Bond ball mill data are used in the advanced Comminution Economic Evaluation Tool CEET grinding simulation system for design optimization and production forecasting studies The SPI has the advantage of requiring a low sample weight and is therefore well suited for geometallurgical mapping of ore deposits
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