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The experimental execution conditions of the standard Bond test, together with the specification of the Bond mill are given in Table 1. Table 1. Bond's mill specification and grinding conditions Mill diameter, D m, cm 30.48 Mill Length, L m, cm 30.48 Number of mill rotations in minutes, n, min-1 70 Mill balls weight, M b, kg 21.125
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The Bond grindability testing procedure has been standardized to obtain the same grindability values, i.e., Bond work index (BWi), on the same ore when tests are performed in different laboratories or by different operators. This is accomplished by the standardization of mill dimensions, tumbling speed, grinding-ball charge weight and …
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bond 3fs law for crushing mills. Relationships between comminution J energy and product. ball/rod mills and has become more likely a standard. The general form of Bond's equation is as follows: [6] where W is the work input (kWh/t); Wi is the work index (kWh/t) which expresses the resistance of the material to crushing and grinding; and F80 and P80 are the 80% passing …
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This paper presents the breakage properties of five different porous materials based on a kinetic model, which was commonly used in the cement industry. For this purpose, firstly, standard Bond's grindability tests were made for five porous samples. Secondly, eight different mono-size fractions were ground between 1.7 mm and 0.106 mm formed by a V2 sieve series.
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In particular, the Bond work index (wi) is considered a critical parameter at an industrial scale, provided that power consumption in comminution operations accounts for up to 40% of operational costs. Despite this, the variability of wi when performing the ball mill Bond's standard test is not always understood enough.
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30cm x 30cm ball mill used for FC Bond method of grindability testing. Operates at 70 RPM, automatic revolution counter, synchronous motor, smooth operating electric clutch. Includes ball charge. Built using the Fred Bond Theory. All material used is Mild Steel – 1018. TECHNICAL SPECIFICATIONS. FC BOND MILL OPERATING MANUAL
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Ball mill charge size distributions originally specified for Bond grindability tests to determine the Bond Work index (BWi) are not commercially available. Those proposed to date do not match all of Bond's (1961) original specifications of …
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Here is the old Allis-Chalmers Bond Work Index Grindability Test Procedure. The standard feed is prepared by stage crushing to all passing a 6 mesh sieve, but finer feed can be used when necessary. It is screen analyzed and packed by shaking in a 1000-cc graduated cylinder, and the weight of 700 cc is placed in the mill and ground dry at 250 ...
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The work index expresses the resistance of the material to grinding. It represents the kilowatt hours per tonne required to reduce the material from theoretically infinite feed size to 80 passing 100μm (Wills and Napierpercent -Munn, 2006). Bond devised several methods for predicting ball-mill and rod-mill energy requirements and
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Laboratory Rod Mill 911Metallurgist. A Laboratory Rod Mill OR Ball Mill for large capacity fine milling up to 21 litre vessel Easy convertible to a Rod Mill Variable speed setting Variable volumes on request Drums balls and rods available in different materials Easy tilt function to empty the barrel AVAILABLE IN ROD MILL WAVED Bond INNER SHELL ROD MILL …
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Estimation of the Bond Grindability Index From the Sink-Float Test ... The Bond ball mill has no lifters and all the inside corners are rounded. ... Therefore, the work indices were determined at a standard test sieve size (P i ) of ... was determined by using the main method called ''specific gravity'' (ASTM 1959). Get Price
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the determination of the Bond grindability work index, the standard Bond procedure must totally be employed. The standard procedure was described at length by Dister, R.J. (n/a) and Pongprasert et al. (1994). 3. Results and Discussion 3.1Coal analyses and Hardgrove grindability indices In all coal specifications, it is important that the basis
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The Bond grindability test, through which the Bond ball mill work index (Wib) is measured,(1) is a very useful tool in the analysis of grindability of ores from different areas of a mineral deposit, being very successfully used in studies of ore variability by Vale S.A. The estimation of Wib values of samples from drill cores allows, in the
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Essa® Bond Test-Work Equipment. Internationally accepted mineral metallurgical standard test procedures to determine the physical properties of ores include the Bond ball mill work index and the Bond rod mill work index. These are empirical indices determined by close circuit grindability tests developed by F.C.Bond in the mid 1930's.
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Ball mill wio, bwio 8.6 circuit wio, owio 14.6 bond ball mill work index, bwi, kwht 13.4 bond rod mill work index, rwi, kwht 18.1 table 1. example of agsag ball mill circuit wio calculations 1 2 abstract optimum use of power in grinding, both in terms of grinding efficiency and use of installed capital, can have a large effect on.
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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].
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Gb Bond's standard ball mill grindability, net grams p of ball mill product passing sieve size P 1 produced per mill revolution. The rest of the terms are defined as in Equation (1). The work index obtained following the standard Bond grindability test described above predicts the energy requirement for a 2.44 meter (8ft.) inside liners ...
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Number of revolutions of the ball mill for the next run and percent circulating load were calculated. The grinding process was repeated until a target 250% ± 2% circulating load was obtained. Figure 1. Grinding Method III. Results and Discussion To determine the Bond work index of the given ore, equation 1 was used.
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C O N S U L T I N G L T D Technical Memorandum. Ef5bm p80103 1145 p80 3 the ef4 formula requires both the rod mill and ball mill work index rod mill wi is used to calculate the optimal feed size and because this is a singlestage ball mill calculation the f80 is actually the rod mill feed size 10000 m from table 1 and the p80 is the ball mill circuit product the ef5 factor only …
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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.
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3350µm in size) is conducted to for the bond grindability test. Results of the particle size distribution of crushed limestone of all seven samples were collected from the different faces of quarry are given as following . Fig. 3. Ball Mill TABLE 2 USUAL VALUES OF BOND WORK INDEX . Fig. 4. Commulative passing mass (%) with respect to
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BALL MILL Specification Number A Process Data Sheet xxxx-xxx-xxx Sheet No : 1 of 2 Area: xxx Client : Operating Centre: Jakarta No. 1 Working 1 Service: ROM Ball Mill Item No: 1 of: Standby 0 xxxx-ML-001 2 Manufacturer: Model Type and Number: 3 OPERATING CONDITIONS 4 MATERIAL HANDLED: Crushed Ore 5 Hazard Considerations: Yes X No Type: 6 DESIGN …
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Over the years, alternative procedures to the Bond grindability test have been proposed aiming to avoid the need for the standard mill or to reduce and simplify the grinding procedure. Some of them use the standard mill, while others are based on a non-standard mill or computation techniques. Therefore, papers targeting to propose a better alternative claim to …
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Essa® Bond Test-Work Equipment. Internationally accepted mineral metallurgical standard test procedures to determine the physical properties of ores include the Bond ball mill work index and the Bond rod mill work index. These are empirical indices determined by close circuit grindability tests developed by F.C.Bond in the mid 1930's.
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