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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,
A comparison of the wear/energy values resulting from the Bond abrasion test with actual mill data for five ores and 11 mills is shown in Figure 1. 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0 5 10 15 20 Bond Work Index Wi] Wear Bond Rate Wear Real Rate Au oxide Au sulphide Au ore Cu ore Pb/Zn ore Figure 1: Wear/Energy results for the cases tested
laboratory ball mill work index can be used to compare the grindability of different ores in ball 4 milling (Bond, 1961 and Rowland and Kjos, 1980).
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 3.10), a question arises as to whether this practice will alter the ball mill work index (BW i) of the material ...
Alsto Bond Index Ball Mill. Internationally accepted mineral metallurgical standard test procedures to determine the physical properties of ores include the Bond ball mill work index. This is empirical index determined by closed circuit grindability …
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.
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. …
The Bond ball mill work index test has been used for ore hardness characterization for more than 80 years. Nevertheless, the test suffers from significant disadvantages when compared with other
Alsto Bond Index Ball Mill. Internationally accepted mineral metallurgical standard test procedures to determine the physical properties of ores include the Bond …
JKTech conducts regular quality control testing of the laboratories licensed to perform JK Drop Weight, SMC and JK Bond Ball Mill Tests to ensure that results are all within acceptable statistical limits. This means that clients can be confident that results are accurate whichever laboratory performs the testwork. Also, all results from these
• Grindability as indicated by the bond ball mill work index (BWi) ranged from 10–35 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.
Axb: JK Drop Weight Test ore hardness index BBMWi: Bond Ball Mill Work Index C i: Crushing parameter COV: Coefficient of variation DWi: Drop Weight Index DWT: Drop Weight Test E: Young´s modulus of Elasticity Ecs: Specific Comminution Energy E is: Specific input energy F 80: 80% of the feed passing : Proprietary function
Keywords: Ball Mill Work Index, Bond Index, Grindability, Ball grinding, Ore testing, Grinding energy consumption, Physical and mechanical ore properties Suggested Citation: Suggested Citation Valerevich Lvov, Vladislav and Sergeevich Chitalov, Leonid, Comparison of the Different Ways of the Ball Bond Work Index Determining (September 12, 2019).
the relative grindability of different ores in ball milling (Bond, 1961 and Rowland and Kjos, 1980) To use the Bond ball mill work index to determine the ball mill specific energy required for a particular grinding task, the Bond equation must be used and the various relevant efficiency factors applied. In
laboratory tests, typically Bond ball mill Work Index and SMC test® / JKDWT A*b (Bond, 1961; Morrell, 2004). Due to budgetary constraints, this has curtailed the collection of suffi cient number of BMWi or A*b measurements to allow the inherent variability to be adequately quantifi ed for direct
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 fixed exponent determined by a calibration procedure.
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 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 passing size of <3.35 mm.
The particle size range of the biomass particles (prior to densification) was obtained using the British standard BS EN 16126:2012 . 2 litres of boiling deionised water was poured over 300 ± 1 g of each pellet sample and then soaked for 24 h. The samples were then dried at 35–60 °C until they reached 5–15% moisture content.The samples were then split into two portions; …
For the circuit design a Bo nd ball mill work index of 18.1kWh /t was used with design contingency to increase to a maximum of 19.1kWh/t. Design comminution data is …
Bond's approach consists of determining the ore hardness characteristics, or Work Index (Wi) via standardized laboratory testwork. The full suite of Bond comminution tests provide the Ball Mill Work Index (BWi), the Rod Mill Work Index (RWi), the Crusher Work Index (CWi) and the Abrasion Index (Ai).
Bond Ball/Rod Mill Work Index. Bond ball mill work index (BBMWI) test is a standard test used to measure the ball mill work, which is calculated in accordance with the procedure proposed by the Bond [21]. The BBMWI determines how much energy is needed to grind a sample of ore in a ball mill [22].
The Work Index is used when determining the size of the mill and grinding power required to produce the required ore throughput in a ball mill. 2. Procedure 2.1. Bond Ball Mill Grindability The sample was crushed to passing 6 mesh (3.35mm), from this a 700 cc volume was measured and weighed to be used as feed for the Bond Mill.
standard Bond crushing, and rod mill work indices, abrasion indices and by Dawson for Bond Ball Mill Work Index tests using crushed feed, and Standard Autogenous Grinding Design (SAGDesign) Tests, patented by Outokumpu. (See reference 8 below). The comparison of these results gives context to how the various measurements relate to each
This Table of Ball Mill Bond Work Index of Minerals is a summary as tested on 'around the world sample'. You can find the SG of each mineral samples on the other table. Source 1 ... Bond Work Index Tester . by David Michaud May 13, 2021 June 19, 2015 Categories Grinding Post navigation.
test. This isn't reported in a standard ball mill work index test, but the method of Levin, 1989, can be used to calculate a "Levin B value" which is the kW·h per revolution of a Bond laboratory ball mill. Dividing ball mill grindability (g of product/rev) by the Levin B (kWh/rev) gives the desired units of measurement (g/kWh).
• 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.
In general, Bond's work index is used to determine the grinding efficiency and also to calculate the power requirement. The process is very time consuming and it requires skilled labor and specialized mill. A systematic investigation was carried out to predict Bond's work index using simple field measurable properties of rocks.