Prediction of Bond's work index from field measurable rock …
For the evaluation of laboratory and industrial experiments, the work index can be determined as follows: BWI = 44.5 P 1 0.23 × G 0.82 10 P − 10 F where BWI = Bond's work index (kWh/sh. Ton), F = 80% passing size of original feed (μm), P = 80% passing size of circuit product (μm), P 1 = Test-sieve size (μm) and G = Net grams of …
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Procedure for determination of ball Bond work index in …
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., 2006 ). This index is widely used in the mineral industry for comparing the resistance of different materials to ball milling, for estimating the energy required ...
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A CRITICAL REVIEW OF GRINDING DESIGN …
• Bond Ball Mill Work Index Test • Bond Abrasion Test (High speed vanes) • MacPherson Autogenous Wi Test, AWi ... • Bond Crushing Work Index Test • SAG Power Index (SPI) Test Design Methods Common design methods include the following. 1. MacPherson. In house interpretation. 2. JK Tech. Software, JK Simmet …
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Development of a simplified test for the determination of the Bond Ball …
In the case of ball mill-based circuits, the Bond test is commonly used to design and optimize circuits (Bond, 1960, Mcivor, 2015, Morrell, 2019), the result of which is referred to as Bond Ball Mill Work Index (BBMWI). Based on Bond's method, sizing and optimizing the operation of mills includes determining the ore grindability using a ...
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Grinding work index according to Bond
The Tovarov grindability index is used to determine the influence of materials on the cement clinker grinding capacity of a mill; the basis is rotary kiln clinker with a defined grindability index of a = 1.According to this, a mill grinding 30 t/h clinker, will grind 30 x 1.40 = 42 t/h of marl or 30 x 0.6 = 18 t/h of silica sand. The grindability index of rotary kiln …
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Correction of Bond Ball Mill Work Index Test for Closing …
The laboratory test work program was carried out on SAG belt cut and geo-unit samples of two BC copper-porphyry orebodies yielding an exponent of-0.56 across the range of typical ball mill ...
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How to determine the Bond work index using lab ball mill …
The Bond work index is one of the most useful and interesting parameters used in designing grinding equipment. However, it must be obtained under restrained conditions, especially in regards to the…
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Estimation methodology for Bond ball mill work index …
A standard Bond mill (Fig. 1) was designed to perform the work index tests and determine the energy consumption of various s minerals.The mill has a round internal housing at the corners, has no lifters, and is for dry grinding. The inner diameter and the length are 0.305 m, and the ball load is 19.4% of mill volume (equaling a total weight of …
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Estimation methodology for Bond ball mill work index …
This paper proposes a new method to estimate the Bond Ball mill work index result to decrease experimental time. Four types of ore (limestone, fluorite, …
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USING THE SMC TEST® TO PREDICT COMMINUTION …
can be determined using the data generated by a conventional Bond ball mill work index test (M. ib. is NOT the Bond ball work index). M. ic. and M. ih. values are also provided as a standard output from a SMC Test ® (Morrell, 2009). The general size reduction equation is as follows (Morrell, 2004. b): f x f x 2. 1 i i. 4 2 W M x x. 1 (1) where ...
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Secrets of the Bond Ball mill grindability test
The Bond ball mill grindability test is one of the most common metrics used in the mining industry for ore hardness measurements. The test is an important part of the Bond work …
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Bond Work Index Formula-Equation
The sample was received crushed appropriately for the ball mill test. Ball Mill Grindability Test was conducted by standard practice using 100-mesh (150 pm) closing screens. The ball mill work index is shown below. BM Wi (kW-hr/st) = 17.97 ; BM Wi (kW-hr/mt) = 19.81; Bond Ball Mill
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Comparison of the Different Ways of the Ball Bond Work Index
Many researchers have tried to find alternative methods for determining this Index - to reduce labor costs, sample weight, or to get one without standard equipment. This paper was carried out with the purpose of reviewing, classifying and testing the existing methods for determination the Bond Ball Mill Index.
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BOND'S WORK INDEX: WHAT IT IS AND WHAT IT ISN'T
Process and equipment design can use the equation by inputing the desired feed (F80) and product sizes (P80), measuring a work index value (Wi) in the laboratory and then …
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Bond´s work index estimation using non-standard ball mills …
ball mill test. Mineral Processing and Extractive Metallurgy, 117-125. ... The Bond work index (BWI) is a well-known method used when selecting comminution equipment, to evaluate the grinding ...
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A new approach to the calculation of bond work index
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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A new methodology to obtain a corrected Bond ball mill work index …
The Bond Third Theory method is widely used in the design of the grinding cycle, selection of grinding equipment, determination of required grinding power, and performance evaluation of the process. ... Y., Doll, A., 2018. Correction of bond ball mill work index test for closing mesh sizes, in: Proceedings of the 14 th International …
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Secrets of the Bond Ball mill grindability test
feed size distribution is different to a standard Bond ball mill work index test. A series of 10 samples for an Andean copper project were treated to both the SAGDesign (and Sd_bwi) test and the standard Bond ball mill work index test with 180 µm closing screens. The SAGDesign results (with the non-standard ball mill feed) are given in …
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Secrets of the Bond Ball mill grindability test
The Bond ball mill grindability test is one of the most common metrics used in the mining industry for ore hardness measurements. The test is an important part of the Bond work index methodology ...
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Bond Work Index Test Ball Mill
The FC Bond Work Index Test Ball Mill was designed by F. C. Bond for use in determining the Bond Index, a measure of grindability and power required for grinding applications. The FC Bond Mills are used in …
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Testwork: Bond ball mill work index
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-cycle' test where ground product is removed from …
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Bond Work Index Formula-Equation
The work index Wi can be determined from plant operations and from laboratory ball mill grindability, rod mill grindability, and impact crushing tests. The laboratory test results are used to check the …
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A new approach to the calculation of bond work index for …
The standard Bond method is the most acceptable method for designing and selecting ball/rod mills described by their basic parameter called work index (Wi). The standard Bond method is a tedious time … Expand
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Bond´s work index estimation using non-standard ball mills
The Bond Work Index (Wi) is a common technique for the estimation of hardness and energy requirement for comminution using ball mills. However, this …
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Bond Ball Mill Grindability Test Summary
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.
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Bond Grindability Test Procedure
For the ball mill grindability test, the work index is calculated from the following revised equation (in short tons): where: Pi = sieve size tested (microns) Gpb = ball mill grind ability Wi, P & F have the same meanings as in the top equation. Equipment required: Laboratory ball mill, 34.02 cm x 34.02 cm with following ball charge: Agitator ...
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A Review of Alternative Procedures to the Bond Ball Mill …
Smith and Lee [12] determined the Bond work index in a standard mill for eight different materials at different openings of a comparative sieve according to the standard Bond test. They compared the data obtained by the standard Bond test and the data from the open-circuit grinding, i.e., the first grinding cycle of the standard Bond test. The ...
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Using Rock Geomechanical Characteristics to Estimate Bond Work Index
2.2 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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A procedure for rapid determination of the Bond work index
The standard Bond method is the most acceptable method for designing and selecting ball/rod mills described by their basic parameter called work index (Wi). The standard Bond method is a tedious time … Expand
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Rapid determination of Bond rod-mill work index by …
For comparing the standard Bond rod-mill work index and the new modeled method, work index (W i) and produced fine particles in a cycle (G i) for the four samples determined. The performed paired Student's t -test results indicated that the Standard Deviation for G i and W i obtained by the shortened method are respectively 0.50 and …
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