The reason for this variation in ball mill work index is because the ore at Mt. Milligan has an intrinsic exponent of 0.45 in the 100 m to 200 m size range, not the 0.50 exponent empirically measured by F. Bond. The work index increase between 100 m and 76 m is due to a porphyritic grain size that causes a spike in energy
bond work index for an ultrafine mill jjvastgoed.nl. bond method for ball mill work index test. Bond Work Index an overview ScienceDirect The ball mill work index laboratory test is conducted by grinding an ore sample prepared to passing 3.36 mm 6 mesh to product size in the range of 45-150 m mesh, thus determining the ball mill work index Wi B or BWi.get price
Bond Grindability Index Test Ball Mill. A Bond Ball Mill, 12 x 12 of fabricated construction comes with electric motor and gear reducer drive, digital counter, jogging button to provide positioning of drum for loading and unloading, emergency stop button, 44 lb ball charge, stand and receiving pan.
Comminution. This test determines the Bond Rod Mill Work Index, which can be used with Bonds Third Theory of Comminution to calculate net power requirements of sizing rod mills The test is a closed-circuit, dry grindability test, is run in a standard rod mill, and can be performed at
The recommendations are given for selecting the Bond mill revolutions in the first milling cycle for apatitenepheline, copper nickel and iron ore for the sieve size 106 m. An original procedure chart is proposed for choosing the determination method of the Bond Ball Mill Work Index
Dec 08, 2019 characterized using XRD, XRF, and electron and optical microscopy. 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 kWht to 20.21 kWht. Examination of the possible correlations between BWI and the geological features
Testwork Bond ball mill work index SAGMILLING.COM 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 ...
The Bond Ball Mill Grindability Test is a locked-cycle 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 scale-up.
Jul 30, 2020 A Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mills and the associated grinding circuits. 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.
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Jul 17, 2013 At the Olympic Dam mine in South Australia, plant performance variables of interest include the recovery of Cu and U 3 O 8, acid consumption, net recovery, drop weight index, and bond mill work index. There are an insufficient number of pilot plant trials 841 to consider direct three-dimensional spatial modeling for the entire deposit.
May 12, 2014 milling machine for bond ball mill work index equipment is one of our most main products limestone crushing machine, grinding mill, sand Read More.
Bond also defined a test for rod mill grinding using a 305 mm 610 mm standard mill requiring up to 20 kg samples. Test conditions differ, e.g., the circulating load is changed to 100, and also the Bond equation for calculating the rod mill work index is slightly different.
The digital energy meter was previously tested and evaluated in Bond ball mill Work Index testing where direct measured comminution energy of ores processed in the Bond ball mill were compared ...
Typical values of Bond ball mill work index for soft oxidised ore bodies lie in the range 5-10 kWht at a standard product size of 80 passing 75 m.
where CF is the Essbm calibration factor in the Circuit Settings for ball mill operating work index versus laboratory ball mill work index. A value of zero means use the BondRowland SSBM formula to predict E ball, a value of -0.05 means use 5 less than BondRowland SSBM formula to predict E ball. CF is a negative number if Wi O is less than ...
Bond Ball Mill Index Test JKTech. A BBMWI test is a standard test for determining the Bond Ball Mill Work Index of a ... required for a given throughput of material under ball mill grinding conditions. ... Index test may be required for the design of a new mineral processing plant. Read more
Bond Work Index Procedure and Method. 22092017 The Bond grindability was calculated to be 121 g net undersizerevolution by averaging the results from the last 3 runs on the Bond Mill The grindability is defined as the ease at which a mineral particle is reduced to a predetermined size and used
Aug 10, 2016 A line can reliably describe the relation of the Bond Rod Mill work index RWI and the temperature as shown in Fig. 3 and can be represented by the following equation 7 RWI 0.49 T 40.39 with a high R-squared value of 0.99.
Correction of Bond Ball Mill Work Index Test for Closing . Table 1 Bond Ball Mill Grindability Test Summary Closing size m Copper Mountain F80 m P80 m Gram per Revolution Work Index metric Specific Energy kWht 300 GeoMet Composite 2669.8 215.1 1.04 26.2 12.8 SAG Belt End 2812.4 210.4 1.03 25.8 12.9 SAG Belt Start 2626.5 216.0 1.03 26.6 12.9 SAG Belt Mid 2627.2 212.1 1.05 25.8 12.7
Apr 19, 2018 The average Bond mill work index of the 12 composites tested was 14.5 kWht. These results provide very strong support for an improvement on the more conservative recovery estimates employed in our PEA of 92, and are very much in line with the higher recoveries realized from 36 years of continuous historical production at Madsen1, states ...
JK Bond Ball Mill Test Since its introduction in the 1960s, the Bond Ball Mill Work Index BBMWi parameter has been extensively used in predicting ball mill power draw. Use of Work Index Along with comminution circuit design the work index parameter is widely used in tracking mill performance. Due to the age and lack of controls for the test,
Limestone Analyses via Bond Work Index For full scale on-site ... Limestone Analyses via Bond Work Index ... limestone is typically received with a diameter of about 1 in. 25 mm ... fraction underflow is returned to the ball mill.
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.
Bonds Work Index Ball Mill. Bond method for ball mill work index test 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 ...
Procedure for determination of ball Bond work index in the ... A Bond Ball Mill Work Index test is a standard test for determining the ball mill work index of a sample of ore. ... for this work. References.
a method using Bond Indices than adding a single factor of 1.25 to arrive at the AGSAG speci c energy. In 1991 the Canadians developed the SAGPower Index SPI, test using 2 kg of material in a 300 mm diameter mill. This test has been further developed by Starkey, Hindstrom and Orser 2006. This test now includes a Bond Ball mill work ...
The Bond Ball Mill Grindability Test Bond, 1952, 1961 gives the Bond Ball Mill Work Index. This Index expresses the resistance of a material to ball milling the higher the value of the Bond Ball Mill Work Index, the more difficult it is to grind the material using a ball mill. This Index is widely used in the mineral industry for Get Price
Dec 18, 2013 For P80s finer than 75 m, the Levin test, a modified Bond ball mill work index test, may be used to predict grinding performance. Signature Plots. No general work index formula governing energy use over a range of conditions, like the Bond equation for intermediate grinding, has yet been found for the fine grinding regime.
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The Bond work index and the grindability index can therefore be estimated from the mill, involves a sequence of crushing and grinding proDate 29 March 2004. 2 . Bond ball mill work index reduction after HPGR. Ore. Crusher. Read more
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
Jan 01, 2013 To calculate the Bond work index Wi in a standard laboratory scale rod-mill, Bond derived the following equation 1 W i 62 P i 0.23 G i 0.625 10 P - 10 F kw h sh
Dec 07, 2018 It is commonly known that one must run the Bond ball mill work index test such you pick a closing mesh to give a P80 close to desired grind size. This is because
1961. Bonds third theory is presented in 1. By rearranging the formula to 2, the operating work index Wio of an existing grinding circuit can be calculated