Bond Impact Crushing Work Index -Procedure and Table
The test determines the Bond Impact Work Index which is used with Bond’s Third Theory of Comminution to calculate net power An initial size reduction from material several centimetres in diameter down to one centimetre, or so, is often termed primary crushing. This may be followed by further size 11 Crushing and classification
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Bond Work Index an overview ScienceDirect Topics
In a study on crushing and grinding, fracture toughness has been taken as a key index similar to the Bond Work Index. Due to many cracks dealt with, rock fragmentation is a As Alex told you: The crushing work index you calculated appears mostly correct. The only correction factor that might affect the calculation is to correct for the efficiency of the Crushing work index Calculation Crushing, Screening
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Work Index SpringerLink
The work index can be used to evaluate the influence of various operating variables on crushing efficiency. For an industrial crushing process with a given feed Discusses the three laws of comminution, namely the Rittinger's law, the Kick's law and the Bond's law, and the general formulation by Walker et al. Also dis...Rittinger's, Kick's and Bond's law, work index and exercise
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Relationship between A*b and Bond impact work index for the
The crushing work index (CWi), estimated on the basis of the twinpendulum test, has been proposed by Fred Bond and accumulates a long track record in predicting the The Bond Work Index (Wi) is a common technique for the estimation of hardness and energy requirement for comminution using ball mills. However, this technique is time-consuming (close to 5 hoursDistribution of impact (crushing) work index for
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Impact work index prediction from continuum damage model of
The present paper shows that the impact work index actually reflects two properties that characterize material fracture: the particle fracture energy and the Bond’s Law: for n= 1.5. Kb a constant that depends on the type of machine and on the material being crushed. Work Index, Wi defined as the gross energy requirement in kilowatthours per ton (kWh/ton)of feed needed to reduce a very large feed to such a size that 80% of the product passes a 100µm screen If Dp in mm, P in kW, in ton/hrSize Reduction PDF Mill (Grinding) Applied And Scribd
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Table of Bond Work Index by Minerals 911 Metallurgist
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. Source 2. Source 3. Source 3. Source 4.The Bond ball mill work index (Wi BM, or BWi) conducted from a feed size of approximately 2 mm to a product size on the order of 100 µm. The Bond rod mill work index (Wi RM, or RWi) Compare and Understand Rod/Ball/Impact
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Rittinger's, Kick's and Bond's law, work index and exercise
Discusses the three laws of comminution, namely the Rittinger's law, the Kick's law and the Bond's law, and the general formulation by Walker et al. Also dis...Also, values of crushing work index (CWi) increased inversely with the A*b breakage index, as commonly observed (Napier-Munn et al., 1996; Tavares and Silveira, 2008).Relationship between A*b and Bond impact work index for the
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Work Index SpringerLink
In the expression, W is the energy consumed by crushing unit mass material; F and P are the particle size of the material before and after crushing (the sieving particle size corresponding to the yield under the sieve of 80%, μm). In a given crushing process, the work index calculated according to the W, F, and P values of the actual Bond Work Index. In the 1930s through early 1950s, Bond developed a new theory of comminution that introduced an index, called the 'Bond Work Index', which relates power consumption in crushing and grinding to the feed and product size distribution. His theory and index were introduced in a widely cited 1952 journal article.Fred Chester Bond
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Determining the Bond Efficiency of industrial grinding circuits
WiBM Bond Ball Mill Test Work Index (kWh/t) Wic Bond Impact Crushing Test Work Index (kWh/t) WioACT Actual Operating Bond Work Index determined from measurements on the circuit (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 Abstract and Figures. 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 conditionsDetermination of work index in a common laboratory mill
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A quick method for bond work index approximate value determination
work index approximate value is exactly the same as in the first two grinding cycles of. Prepare a sample, the same as for the standard Bond test (grind to 100%. -3.327 mm). Determine the startingComminution is the reduction of solid materials from one average particle size to a smaller average particle size, by crushing, grinding, cutting, vibrating, or other processes. In geology, it occurs naturally during faulting in the upper part of the Earth's crust. In industry, it is an important unit operation in mineral processing, ceramics, electronics, and other Comminution
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Size Reduction, the Three Laws of Comminution,
The Bond work index of the ore has been determined. (This result closely matches the reference value for hematite given in Table 1.) It remains to compute the work required for the second set of law for fine grinding; Bond’s law for coarse grinding and secondary/tertiary crushing; and Kick’s law for primary crushing). The novelty in the third law’s proposal was the procedure for determining w i in the case of crushing, rod milling and ball milling [13,15]. The practical interest of w i is unquestionable.Variability Study of Bond Work Index and Grindability Index on
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Crushing Work Index for PQ Core sample 911 Metallurgist
The Bond crushing work index test procedure is not terribly well described, and different laboratories have different procedures that can result in different results (by up to -50% +100%). I am not aware of the calibration of the test being checked in over 50 years, so it is impossible to say which procedure is "correct".Bonds law: An intermediate and more realistic method of predicting power consumption for crushing and grinding was proposed by Bond in 1952. It states that “the work required to from particles of size is proportional to the square root of the volume ratio (S P /S V) of the product. Table below shows work indices for some compounds.Theory of Size Reduction Food Tech Notes
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Size Reduction Problems: Power Consumption, Efficiency, and
25.A certain set of crushing rolls of 100 cm diameter by 38 cm width face. They are set so that the crushing surfaces are 1.25 cm apart at the narrowest point. The manufacturer recommends that they may be run at 50 to 100 rpm. They are to crush a rock having a specific gravity of 2.35 and the angle of nip is 30˚. What are the maximum permissible Chapter 3 Particle Technology (Size Reduction) Kick’s law: the work required for crushing a given mass of material is constant for the same reduction ratio, 3.2.2 Bond crushing law and work index.bonds crushing law and work index
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In naturally occurring ores or minerals the following Course Hero
In naturally occurring ores or minerals the following must be considered o Ores from COMPUTING GENERAL at Kisii Universitycrushing, or impact, work index. The test consists of dropping two pendulum-mounted hammers simultaneously against individual irregularly-shaped crushing from Bond's law of comminution,1 Comparison of measures of rock crushability ResearchGate
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C.A. Rowland Springer
Operating work indices can be compared to work indices from comminu tion tests run on samples of the circuit feed, taken at the same time as the operating data. Table 2 Mill diameter efficiency multipliers. Fo = I 6,000(1 3/Wi)o 5 (4) Inside shell For ball milling: Bond( 1960), in a paper titled "Crushing and grinding calcu
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