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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 <1/2β³ 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. If you
Standard Bond Ball Mill Grindability Test MethodProcedure
Here is the old AllisChalmers 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 1000cc graduated cylinder, and the weight of 700 cc is placed in the mill and ground dry at 250 per cent circulating load. The mill is 12 in. x 12
Correction of Bond Ball Mill Work Index Test for Closing
It is commonly known that one must run the Bond ball mill work index test such you pick a closing mesh to give a P80close to desired grind size. This is because work index frequently changes as a function of the product size in comminution.
Bond Work Index an overview ScienceDirect Topics
The ball mill work index laboratory test is conducted by grinding an ore sample prepared to 100% passing 3.36 mm (6 mesh) to product size in the range of 45150 µm (325100 mesh), thus determining the ball mill work index (Wi B or BWi).
Bond Work Index Tests Grinding Solutions Ltd
Bond Ball Mill Grindability Test. The Bond Ball Mill Work Index (BBWi) test is carried out in a standardised ball mill with a predefined 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 stagecrushed to 100%
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
Bond Tests SGS
The test requires calibration against the standard Bond Ball Mill Work Index test to estimate the Work Index. It is used to show the orebody hardness profile and to predict throughput in a ball mill circuit. SGS created the Modbond grindability test and has a large proprietary database.
test method for bond ball mill work index
Bond Work Index Tests Grinding Solutions Ltd. Grinding Solutions offer both rod and ball mill Bond work index tests as part of the The Abrasion Index is a recognised procedure to quantify abrasiveness and (PDF) determination of Bond rodmill work index by modeling . This test was originally devel tion method of the Bond rodmill work index.
QUICK METHOD FOR BOND WORK INDEXAPPROXIMATE VALUE
grinding cycles. The Bond Work Index is calculated using the formula: π=1,1 44,5 ππ 0,23πΊ,82(10 βπ80 β10 βπΉ80) (1) where W i Bond work index (kWh/t) P c test sieve mesh size (µm) G weight of the test sieve fresh undersize per mill revolution (g/rev) F 80 sieve mesh size passing 80% of the feed before grinding(µm) P 80
Rapid determination of Bond rodmill work index by
01012013· Magdalinovic and Cumpujerovic showed the fact that an approximate value of the ballmill work index can be determined by doing just two grinding tests. Chongbo and Bingchen studied away to simulate the calculation method of the Bond rodmill work index.
Procedure for determination of ball Bond work index in
01012009· 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).
bond ball grinding mill work index determination
Work Index Determination for High Pressure Grinding . Cycle test akin to the bond ball mill work index determination the first cycle starts with minus mesh ore removed since it is believed that the fines content can fill most of the voids allowing little room for rock breakage and piston movement without adequate piston movement there is
Determination Of The Bond Work Index Using An
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 the ball mill
Bond Index Ball Mill / Rod Mill BT 100 XL RETSCH
A clear definition of the required crushing capacities and the desired product quality can be precisely determined by using the Bond Index test methods. Using the Bond Index test procedures it is possible to calculate crushing / abrasion behavior of mineral samples.
CORRELATION BETWEEN BOND WORK INDEX AND
ball mill grindability. The test mesh used was 100 mesh P > 1416 ]. The Bond work index W i was calculated from Equation (2) W i = 44.5/(P 1) 0.23 X (Gbp) 0.82 [10/(P 80) 0,5 0.5± 10/(F 80) ] (2) Where: F 80 is the size in (µm), at which 80 percent of the new feed to ball mill passes,
Comminution testing JKTech University of Queensland
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. The test requires approximately 50% less material than the Bond Ball Mill Work Index test.
Abrasion Test SGS
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 wear/kWh of energy used in the comminution process.
Relationships between comminution J energy and product
Bond developed a standard laboratory test for the determination of the work index for ball and rod mills in 1952 and modified it in 1961. The standard Bond ball mill grindability test is a closed circuit dry grinding test with a 250% circulating load. The standard procedural outline of the test is stated in (Bond) 1961. The work index for a
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 oreβs compentency. Figure 8 plots this ratio versus UCS; no trend is apparent
Operating work index is not the specific energy
The work index can either be measured in the laboratory (the Bond ball mill work index determination is a common example) or it can be calculated from the operating performance of a milling
Testwork: Bond ball mill work index SAGMILLING.COM
Testwork: Bond Ball Mill Work Index Sample Requirements. The test requires about 8 kg of material. Although it can work on feed as fine as 2.5 mm, it is Test Inputs. It is necessary for the engineer to specify the desired product size of the test so that the laboratory can Test Outputs.
Determination Of The Bond Work Index Using An
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 the ball mill
Bond Index Ball Mill / Rod Mill BT 100 XL RETSCH
The grinding jar for the Bond Index Rod Mill is 12β³ x 24β³ 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. The Rod Mill Work Index (RWI) is used for particle size determination in a size range from 25 mm down to 2.1 mm whereas Ball Mill Work
Comminution testing JKTech University of Queensland
A Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mill(s) and the associated grinding circuit(s). Sample requirements: A minimum of 8 kg of material crushed to nominally minus 10 mm is preferred. JKTech would stage crush the sample to minus 3.35 mm, as required for the Bond Ball Mill Work Index test feed.
CORRELATION BETWEEN BOND WORK INDEX AND
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 kilowatthours per short ton required to break from infinite size to a product size of 80% passing 100 µm. If the breakage
USING THE SMC TEST® TO PREDICT COMMINUTION CIRCUIT PERFORMANCE
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, 2004. a) 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
Relationships between comminution J energy and product
Bond developed a standard laboratory test for the determination of the work index for ball and rod mills in 1952 and modified it in 1961. The standard Bond ball mill grindability test is a closed circuit dry grinding test with a 250% circulating load. The standard procedural outline of the test is stated in (Bond) 1961. The work index for a
Operating work index is not the specific energy
The work index can either be measured in the laboratory (the Bond ball mill work index determination is a common example) or it can be calculated from the operating performance of a milling
Abrasion Test SGS
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 wear/kWh of energy used in the comminution process.
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 oreβs compentency. Figure 8 plots this ratio versus UCS; no trend is apparent
bond ball grinding mill work index determination
Work Index Determination for High Pressure Grinding . Cycle test akin to the bond ball mill work index determination the first cycle starts with minus mesh ore removed since it is believed that the fines content can fill most of the voids allowing little room for rock breakage and piston movement without adequate piston movement there is
CORRELATION BETWEEN BOND WORK INDEX AND
ball mill grindability. The test mesh used was 100 mesh P > 1416 ]. The Bond work index W i was calculated from Equation (2) W i = 44.5/(P 1) 0.23 X (Gbp) 0.82 [10/(P 80) 0,5 0.5± 10/(F 80) ] (2) Where: F 80 is the size in (µm), at which 80 percent of the new feed to ball mill passes,
USING THE SMC TEST® TO PREDICT COMMINUTION CIRCUIT PERFORMANCE
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 provided as a standard output from a SMC Test ® (Morrell, 2009). The general size reduction equation is as follows (Morrell, 2004. b): f x f x 2. 1 i i. 4 2 W M x x. 1 (1) where . M. i = Work index related to the breakage property of an ore
Bond Ball Mill Index Test Jktech bebauungwinkel.ch
JK Bond Ball Mill Test JKTech. An improved method using less mass compared to the Bond Ball Mill Work Index test. JKTech Pty Ltd P: +61 73365 5842 E: [email protected] CRICOS Provider 00025B W: jktech.au Development and Initial Validation The JKBBM test was developed at the Julius Kruttschnitt Mineral Research Centre (JKMRC) using a database of 1380 original BBMWi
Testing method for ball mills Outokumpu Technology Oyj
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)
Comparison of UCS to Bond Work Indices
C) for coarse rocks (7550 mm), a rod mill work index (Wi RM) for intermediate sized particles (253 mm), and a ball mill work index (Wi BM) for small particles (<3 mm) (Ammtec, 2000). Laboratory testwork is required to determine these Work Indices, and each test requires carefully collected samples of rock that is representative of future mill feed.
Abrasion Test SGS
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 wear/kWh of energy used in the comminution process.
Bond Grinding Circuit Efficiency ceecthefuture.org
β’ Bond Test WIβs (kWh/t): Crushing:16.0 Rod Mill: 14.5 Ball Mill: 13.8 β’ Bond Standard Circuit Work Index: W1 = 16.0 x [(10 / SQRT 16,000) (10 / SQRT 165,000 )] = 0.9 kWh/t
Relationships between comminution J energy and product
Bond developed a standard laboratory test for the determination of the work index for ball and rod mills in 1952 and modified it in 1961. The standard Bond ball mill grindability test is a closed circuit dry grinding test with a 250% circulating load. The standard procedural outline of the test is stated in (Bond) 1961. The work index for a ball mill,
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