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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 45-150 m (325-100 mesh), thus determining the ball mill work index (WiB or BWi)
Dec 07, 2018 The goal of this work is to create an equation to adjust a Bond ball mill work index from one P 80 basis to another. The proposed model consists of two components, the variable coefficient that is determined from a specific work index determination and a
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 is an alternative procedure to the ball mill grindability test
work indices for the AG/SAG mill and ball mill can be re-organised as [7] and [8], where B’Wio and A’Wio are the corrected operating work indices and WAG/SAG, WBM are the respective power draw of AG/SAG and ball mills. Note that the ball mill operating work index is applied only on the portion that needs the additional grinding (Q2)
WiBM Bond Ball Mill Test Work Index (kWh/t) ... WiRM Bond Rod Mill Test Work Index (kWh/t) WiSTD Standard Circuit Bond Work Index (expected or designed) used for circuit design. Specific energy requirement at the drive pinions. 3.KEYWORDS Work Index, Work Index Efficiency, Bond Work Index testing 4.INTRODUCTION AND BACKGROUND
ball mill grindability. The test mesh used was 100 mesh P 14-16 ]. 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 ( m), at which 80 percent of the new feed to ball mill passes
Jun 19, 2015 A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work index of 15 and a size distribution of 80% passing inch (6350 microns). The required product size distribution is to be 80% passing 100 mesh (149 microns). In order to determine the power requirement, the steps are as follows:
Dec 18, 2013 where W is the specific grinding energy (kWh/t), W i is the Bond ball mill work index (kWh/t), F80 is the feed 80 pct passing size (μ m), and P80 is the product 80 pct passing size (μ m)
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
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 little room for rock breakage and piston movement. Without adequate piston
using a novel ring mill, a laboratory ball mill, a labora- tory rod mill and the semi continuous process using the same rod mill as described below. In all cases the min- eral sample is crushed and screened to pass a predeter- mined size 3.5 or 4 mm. The feed sample undergoes a wet screen analysis and a certain quantity, usually 0.5
Metallurgical tests indicated an average Bond ball mill work index of 14.8 kWh/t for Main Zone material, with a range of 11.5 to 16.6 kWh/t (Imperial Metals, 2012). DESCRIPTION OF THE SAG AND BALL MILL CIRCUITS A conventional SAG and ball mill circuit (SABC) is used to treat material at a production rate of 30,000 t/d. The
Oct 24, 2018 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
closed with a recycle crusher and followed by two ball mills. The energy curve methodology has been used to benchmark the mines and isolate the performance of each comminution device down the circuit to identify areas for productivity improvement. The positions of Mine 1 and 2 on the suite of energy curves are presented in Figure 6
Dec 21, 2009 You could also use a special ground wheel cutter on a horizontal knee mill. When I did proto type and model work we would rough something like that out then spend lots of time picking across it with a ball nose, I've seen many all nighters with a .010 ball nose end mill on real fine detailed work
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
torque mill test is the mill energy input divided by the solids load. The energy specific cumulative grinding rate at each screen size is calculated from a torque-mill test as in the example that follows. Torque mill solids load during test: 11.25 kg (24.8 lb) of ball mill feed sample from plant survey. Sample is reconstituted with water to be
This paper discussed the possibility of using a common lab. mill, such as the Denver lab ball mill, to determine work index. Results obtained show that with an adequate adaptation of the
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