Figure 1 shows a histogram of Bond ball mill work index frequency from MacPherson Consultants (ARMC). This database covers a fraction of all the tests performed by ARMC over the years and around the world. It shows that the ball mill work index is normally distributed with an average of and a median of kWh/t. bOnd rOd mill ...
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Bond Ball Mill Work Index Test (BBMWI) is a
standard test for determining the Ball Mill Work Index
of a sample of ore. 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 for material under ball mill
In conjunction with the Bond ball mill work index they can be used to accurately predict the overall specific energy requirements of circuits containing: ... These values can be used to simulate crushing and grinding circuits using JKTech's simulator JKSimMet. Figure 1 Measured vs Predicted Total Comminution Circuit Specific Energy ...
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These "errors" in the Bond test are often underappreciated in design, and the results are discussed in the context of implications for mill sizing. Other major factors that drive ball milling efficiency, which are not accounted for by the Bond equation but are strongly evident in the JKTech database, are also presented.
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The FC Bond Work Index Test Ball Mill was designed by F. C. Bond for use in determining the Bond Index, a measure of grindability and power required for grinding applications. The FC Bond Mills are used in laboratories throughout the world. A copy of Fred C. Bond's Method of Crushing and Grinding for determination of the Bond Index is included with each mill. This mill can be used to calculate ...
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different ores in AG/SAG milling in exactly the same way as the Bond laboratory ball mill work index can be used to compare the relative grindability of different ores in ball milling (Bond, 1961 and Rowland and Kjos, 1980). However the originally reported A and b parameters which match the SCSE will be still be
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Wi Bond Work Index Ws Specific energy correction for size distribution (kWh/t) WiBM Bond Ball Mill Test Work Index (kWh/t) 3. KEYWORDS Autogenous Grinding (AG), Ball mill, Bond Work Index (Wi), Comminution circuit, High Pressure Grinding Rolls (HPGRs), Rod mill, SemiAutogenous Grinding (SAG), Specific energy (W) 4. INTRODUCTION AND BACKGROUND
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Point Load Index Database Corrections. ... 2 WiC = Bond Crusher Work Index, Wibm = Bond Ball Mill Index and Wirm = Bond Rod Mill Index ... the JKTech drop weight test Axb result versus poin t load ...
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The ability to simulate the Bond work index test also allows examination of truncated ball mill feed size distributions on the work index. For grinding circuits where the feed to a ball mill is sent directly to the classifier and the cyclone underflow feeds the ball mill (see Figure ), a question arises as to whether this practice will alter the ball mill work index (BW i) of the material ...
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GLOBALLY RELIABLE DETERMINATION OF BOND BALL MILL WORK INDEX JK Bond Ball Mill Test The JKBBM test was developed at the Julius Kruttschnitt Mineral Research Centre JKMRC.
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Since first being introduced by F Bond in 1952, the Bond Work Index, derived from the Bond Ball Mill (BBM) Test, is a measure of the resistance of the material to crushing and grinding and can be used to determine the grinding power requirement for ball milling.
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Bond Rod Mill Index Read more about index, brmwi, grinding, jktech, sieve and laboratory.
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40 Isles Road, Indooroopilly, QLD 4068, AUSTRALIA | Telephone: +61 7 3365 5842 | Facsimile: +61 7 3365 5900 | info | After each batch grind, the contents of the mill are sieved on the selected 'closing' screen to remove the undersize.
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Keywords: Ball Mill Work Index, Bond Index, Grindability, Ball grinding, Ore testing, Grinding energy consumption, Physical and mechanical ore properties.
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Figure 13 Example of Bond rod and Bond ball mill grindability test product for the same ore and feed size distribution. For ores that have excessive fines, a modified Bond grindability test is required. This is because, the fine in the feed may bias the Bond milling work index.
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GLOBALLY RELIABLE DETERMINATION OF BOND BALL MILL WORK INDEX JK Bond Ball Mill Test The JKBBM test was developed at the Julius Kruttschnitt Mineral Research Centre JKMRC#8230;
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The article presents the review, studies and classification of the existing methods of the Bond Ball Mill Work Index determination.
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Table 3 Bond ball mill work index database table for example samples Id Name WiBM µclosing WiBM f80 WiBM p80 WiBM gpr WiBMSynthetic Laboratory Comment 1529Lik composite 7 ALS Kamloops Zazu metals NI43101 March 3, 2014 1600Gamsberg Pyrite 106 van Drunick Gerold Palm, IMPC2010
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SMC Data Processing. The results from conducting the SMC Test® are used to determine the dropweight index (DWi) which is a measure of the strength of the rock as well as the comminution indices Mia, Mih and Mic. In conjunction with the Bond ball mill work index they can be used to accurately predict the overall specific energy requirements of ...
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SMC Test Bond Rod Mill Work Index Bond Ball Mill Work Index JK Bond Ball Mill Test Point Load Test High Pressure Grinding Rolls Steel Wheel Abrasion Test Corrosion Test Comminution Testing Flotation Testing Hydrocyclone Testing Mineralogical Assessment
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The power required by the ore to achieve a desired size is estimated using the standard Bond ball mill work index from a testwork program. This work index is used much as described in the original Bond method except that the feed rate and F80 to the Bond calculation is adjusted to compensate for a SAG Project 0002 3
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The ore is locally known as "soft ore", with a Bond ball mill Work Index of kWh/t, and the breakage characteristic parameter A = and b = determined with a drop weight tester (NapierMunn et al., 1996). The ore sample was prepared using a jaw crusher and a rotary divider to obtain the identical subsamples for each test.
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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 closing me sh to give... [↓ read more ↓] Yardin Josefin, Alex Doll ... This paper expands the SAG mill survey database published by the Author at Procemin 2013.
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A database of 336 Bond ball mill work index results generated by commercial laboratories and by the authors was used to generate Fig. 1. Tests with F 80 values finer than 2 mm were excluded, resulting in a calibration data set with the following statistics: • n: 267 • mean: 2505 µm, median: 2508 µm • standard deviation: 226 µm
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historical database which includes resu lts of over 5,000 drop weight charac terizations ... JKTech. (2018). JK Drop Weight Test. ... The most commonly used measure is the Bond ball mill work ...
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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 ...
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Several authors have developed simplified tests to predict ball mill's energy consumption, typically using the Bond Ball Mill Work Index (BBMWI) as a reference. One option requiring less mass is the Hardgrove mill, traditionally used in the laboratory to determine the energy required to grind coal in roller mills.
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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.
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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 the material being processed (equation 3). Wtotal
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JK Bond Ball Mill Test; Our flotation ore characterisation test is the JKTech Floatability Index (JKFi) Test. JK Drop Weight Test and SMC Tests® are licenced to 48 metallurgical laboratories globally. To date, over 55,000 JKTech accredited A x b tests have been completed across more than 32 different commodities.
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In the JKTech database consisting of over 4000 DWT data sets, ... closing sieve size in Bond ball mill work index test (μm) P 80: aperture size, for which 80 % of product is passing (μm) r: rotor radius (m) t 10: percentage of progeny passing an aperture of on tenth of the original particle size. V i:
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See this useful summary Table of Bond Work Index by Minerals. For any circuit, whether a crushing circuit, a rod mill, or a closed ball mill circuit, the Work Index always means the equivalent amount of energy to reduce one ton of the ore from a very large size to 100 um. The sample was received crushed appropriately for the ball mill test.
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The Bond work index, W i, is defined in a Bond ball mill on the samples of standard size − + 0 mm. In practice, it is possible to find materials of nonstandard size that are finer than mm.
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