This is a relatively simple device ( Figure 1 44) that is a low cost device for estimating the comminution parameter A*b and the Bond Ball Mill Work Index at any mine site, with potential ...
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A Bond Work index mill ball charge and closing screen product size distributions for grinding crystalline grains. Int. J. Miner. Process., 165 (2017), pp. 814, / View PDF View article View in Scopus Google Scholar. Menéndez et al., 2018.
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The work index covering grinding of fine particles is labelled Mib (Morrell, 2008). Mia values are provided as a standard output from a SMC Test® (Morrell, 2004a) whilst Mib values can be determined using the data generated by a conventional Bond ball mill work index test (Mib is NOT the Bond ball work index).
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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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The ball mill grindability test is used for describing ore hardness and it is so widespread that the Bond Work Index generated from the test is often referred to as an ore characteristic. The ore resistance to grinding and energy consumption can be expressed using the work index and Bond's Third Theory.
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... An example of this is the aforementioned abbreviated locked cycle method of JKTech [16], known as JKTech Bond Lite (or JK BBL, see Figure 1 ). In the JK BBL, the calibration dataset is...
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Ball Mill Power/Design Calculation Example #2 In Example it was determined that a 1400 HP wet grinding ball mill was required to grind 100 TPH of material with a Bond Work Index of 15 ( guess what mineral type it is ) from 80% passing ¼ inch to 80% passing 100 mesh in closed circuit.
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• SAGDesign (SAG to T80 12 M followed by Bond BM Wi on SAG ground ore) • Bond Ball Mill Work Index (Crushed Feed) • Specific Gravity (part of the SAGDesign test). The results from this work are presented below and are discussed in this paper. The SAGDesign results were compared to JK Drop Weight analysis of results by analyzing the SAGDesign
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The Work Index (BWi) is calculated according to Fred Bond's Equation. Bond Work Index for Testing Procedure. Cleaning and Storing of Ball Mill Charge after the Bond Work Index Procedure is done: Add about 500 g of silica sand into the mill containing the ball charge. Seal the mill. Rotate for 20 revolutions to clean.
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After offering the JK Bond Ball Mill (JKBBM) Test in house for some years, and with over 500 tests performed, JKTech is pleased to announce the JKBBM is now available to be licenced to other commercial laboratories.
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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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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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• the bond ball mill work indices determinations gave reasonably reproducible results, • significant variation was observed in the measurement of the bond rod mill work index on at least one sample tested, and • large variations in abrasion index and crushing work index were due to variations in the test method across the laboratories.
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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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Bond's work index determination, since its inception in 1952, is being used to estimate the power required for milling, sizing of mills and calculation of milling circuit efficiency.
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Ball Mill Work Index has been widely used for ball mill sizing, and is also utilized in computer simulation. BOND ROD MILL GRINDABILITY TEST The Bond Rod Mill Grindability Test is also performed according to the original Bond procedure. It requires 15 kg of minus ½ mesh material that is preferably prepared at the testing facility. The Bond Rod ...
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In the JKTech database % of the 4,608 ore types tested have higher A*b values (refer to Table 2). ... In conjunction with the Bond ball mill work index the DWi and the Mi suite of parameters can be used to accurately predict the overall specific energy requirements of circuits containing:
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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. ... Convert to µm, if needed, before entering into the database. F 80: Sample feed size in µm (and usually will provide a particle size distribution)
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• Grindability as indicated by the bond ball mill work index (BWi) ranged from 1035 kWh/t, with the majority between 15 and 27 kWh/t. No clear relationships in terms A*b and/or BWi was identified with geological aspects logged from the drill core such as weathering, lithology, alteration, alteration intensity, veining or combinations of these.
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ComminutionBond Abrasion IndexBond Crusher Work IndexBond Ball and Rod Mill IndexJKTech Sag Mill Comminution (SMC)JKTech Drop Weight Testing (DWT)UCS Unconfined Compression StrengthIsaMill Ultra Fine GrindingGravity Separation Shaking TableKnelson / Falcon ConcentratorsTBE Heavy Liquid SeparationSpiral Bulk Pilot PlantMagnetic SeparationDavis Tube Recovery (DTR)Wet Low ...
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samples and perform the rod mill test on the samples blend. Bond Ball Mill (BBM) Standard Test The procedures to carry out the Bond grindability tests in ball mills and rod mills are outlined in They are usually referred to as the standard tests, but it must be highlighted that the procedures haven't been defined by ...
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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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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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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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mill. As such, primary ball mills should be designed with the rod mill work index, and singlestage ball mills should be with both the rod mill and ball mill indices. This is because it is common to observe a difference (sometimes significant) between the rod mill and ball mill index values for a given ore type (McKen, Verret, Williams, 2006 ...
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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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A material supplier from Belgium would like to produce limestone powder for his custome...
India is rich in various mineral resources and it is an important mineral processing market
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