Rod Mill Design Calculations
Rod Mill Design Calculations. EF1 – Dry Grinding – for the same range of work, dry grinding requires 1.3 times as much power as wet grinding. EF2 – Open Circuit Grinding – when grinding in open circuit ball mills, the amount of extra power required, compared to closed circuit ball milling, is a function of the degree of control required ...
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Determining the Bond Efficiency of industrial grinding …
8.2.1 Apparatus. The Bond rod mill is made of metal, 305 mm maximum inside diameter, with a wave-type lining. The internal mill length is 610 mm. The grinding charge consists …
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Rod Mill Design & Power Draw
A table of estimates of rod mill power draw is published in Rowland's work (1982). Figures in this table are generally slightly low compared to some reported plant data or other manufacturers' estimates, and are based on an empirical formula initially proposed by Bond (1961) designed to cover a wide range of mill dimensions, and the normal ...
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Bond Rod Mill Work Index Equipment & Apparatus Review
The specification for the apparatus to determining a "Bond" rod mill work index is first described in Bond & Maxton (1943). It states that the apparatus is a tumbling rod mill to be operated in a locked cycle test at a fixed circulating load. The geometry of the grinding chamber is described as: … See more
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Rapid determination of Bond rod-mill work index by …
To calculate the Bond work index ( Wi) in a standard laboratory scale rod-mill, Bond derived the following equation: W i = 62 P i 0.23 G i 0.625 10 P - 10 F kw h sh t where F is 80% passing size of original feed, P is 80% passing size of circuit product and Pi is the test-sieve size in μm [1]. The standard procedure to determine all Bond work ...
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Bond Work Index Tests | GSL
The Bond Ball Mill Work Index (BBWi) test is carried out in a standardised ball mill with a pre-defined media and ore charge. ... GSL can carry out Bond Rod Mill Work Index tests to determine the energy requirements for milling ore in a rod mill. The test requires a minimum of 20kg of -12.5mm material. Closing screen sizes typically range from ...
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BOND'S WORK INDEX: WHAT IT IS AND WHAT IT ISN'T
TYPES OF WORK INDEX. For the purposes of this paper, it is useful to classify three types of work indices: 1. A grindability measurement made in a laboratory work index …
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Determination of work index in a common laboratory 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 Bond standard lab mill. ... Part 2: A phenomenological basis for the analysis of systematic errors for the rod mill test," Miner. …
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Using Rock Geomechanical Characteristics to Estimate Bond …
Using Rock Geomechanical Characteristics to Estimate Bond Work Index for Mining Production Blocks. Published: 28 October 2021. Volume 38, pages …
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Rod Mill Work Index Table
Here is a list presented in table form of Rod Mill Work Index as tested/presented by SME handbook of mineral processing, N.L Weiss Editor, N.Y. 1985. ... Rapid Determination of Bond Rod-mill Work Index by Craig Taylor on Scribd . by David Michaud February 29, 2024 June 19, 2015 Categories Grinding.
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Simulating the Bond rod mill grindability test
The Bond rod mill work index ( Wir) is measured using Bond´s standard rod mill grindability test, which is conducted in locked-cycle mode to emulate the continuous closed-circuit operation. Besides the labor-intensive conduct of the test, which typically requires from 5 to 10 cycles for reaching steady-state, it normally requires 8–20 kg of ...
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Bond Impact Crushing Work Index -Procedure …
The test determines the Bond Impact Work Index which is used with Bond's Third Theory of Comminution to calculate net power requirements when sizing crushers*. It is also used to determine the …
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Tubular Rod Mills
Mill Bond Work Index W i (kWh/t) Rod mill, test at 1400 μm (12 mesh) 13.0: Ball mill, test at 212 μm (65 mesh) 11.5: Ball mill, test at 150 μm (100 mesh) 12.2: Between the rod and ball mill an intermediate separator in the form of a hydrocyclone was placed. Determine power at the pinion shaft (including loss due to bearings, friction, etc.) for
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Rapid determination of Bond rod-mill work index by …
The model was validated for four materials, showing that it can predict the Bond rod mill work index with deviations below 10%. Requiring only 1.5–3kg of sample, the procedure is demonstrated to ...
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Calculate a Mill's Operating Work Index
Calculate a Mill's Operating Work Index. Use this online formula to calculate a Ball Mill, Rod Mill or SAG Mill Operating Work Index. Based on Fred Bond's work you can estimate the energy used into your grinding circuit. This is the most accurate and informative method, but much of the data necessary for its application is not yet …
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A quick method for bond work index approximate value determination
determination Bond. 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 . -3.327 mm ...
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Bond Work Index (Energy equation)
You need a two-stage solution, first stage open-circuit mill and then second stage closed-circuit mill. First stage, will be broken into two parts as well, you use a Bond rod mill work index for the coarse component of the ore (+2.1 mm) and the Bond ball mill work index for the fine component (-2.1 mm).
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Bond Rod Work Index Mill
Bond Rod Index Mill, 12" x 24" consisting of a one (1) piece cast shell complete with integral wave, 1 Hp 3/60/220 volt motor/gear reducer drive, support frame which allows the mill to tilt +/- 5 degrees during operation and 45 degrees for discharge (manual operation), receiving pan, rod charge and control panel complete with digital revolution counter, …
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Article Variability Study of Bond Work Index and …
The Bond work index most commonly referred to is the BBM work index. This value is obtained in a 12" × 12" laboratory mill running at 70 rpm, with rounded inner edges and without lifters. The grinding charge is comprised of …
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Rapid determination of Bond rod-mill work index by …
To calculate the Bond work index ( Wi) in a standard laboratory scale rod-mill, Bond derived the following equation: (1) W i = 62 P i 0.23 G i 0.625 10 P - 10 F kw h sh t where F is 80% passing size of original feed, P is 80% passing size of circuit product and Pi is the test-sieve size in μm [1]. The standard procedure to determine all Bond ...
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AMIT 135: Lesson 8 Rod Mills – Mining Mill Operator …
Typically R = 8. Rod Mill Charge: Typically 45% of internal volume; 35% – 65% range. Bed porosity typically 40%. Height of bed measured in the same way as ball mills. Bulk density of rods = 6.25 tons/m3. In wet grinding, the solids concentration 1s typically 60% – 75% by mass. A rod in situ and a cutaway of a rod mill interior.
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Bond´s work index estimation using non-standard ball mills
The results showed that using the non-standard mills (between 20 and 35 cm in diameter), the Bond´s model constants (α=0.23; β= 0.82, and γ = 44.5), are unable to predict the Work Index properly.
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BOND'S WORK INDEX: WHAT IT IS AND WHAT IT …
The commonly used grindability tests included in the database are the Bond work indices for ball milling, rod milling and crushing; the drop weight test results A, b, A×b, DWi, Mia, Mic, Mih...
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Essa® Bond Test-Work Equipment – Essa North …
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 …
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Table of Bond Work Index by Minerals
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. ... (AG/SAG, Rod, Ball Mill) Source 5: Doering international Source 6: SME handbook of mineral processing, N.L Weiss Editor, NY 1985. Bond Work …
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Commentary on the apparatus of the Bond rod mill work …
A "Bond" rod mill work index is to be determined in an apparatus with a wave liner. The author is aware of six laboratories that offer a rod mill work index test …
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Comparison of UCS to Bond Work Indices
FIGURE 5: BOND ROD MILL WORK INDEX v. UNCONFINED COMPRESSIVE STRENGTH 0 100 200 300 400 UCS (MPa) 5 10 15 20 25 30 35 WiRM (metric) The lack of fit observed relating the crushing Work Index was expected to carry over to the other Bond Work Indices. Figure 5 displays the plot of rod mill Work Index (Wi RM) versus UCS. …
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A new approach to the calculation of bond work index for …
A Bond Work index mill ball charge and closing screen product size distributions for grinding crystalline grains. Int. J. Miner. Process. (2017) ... The ore resistance to grinding and energy consumption can be expressed using the work index and Bond's Third Theory. The Bond Third Theory method is widely used in the design of the …
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Variability Study of Bond Work Index and Grindability …
Abstract: It is a well-known fact that the value of the Bond work index (wi) for a given ore varies along with the grinding size. In this study, a variability bysis is carried out with the Bond standard grindability tests on different critical metal ores (W, Ta), ranging from coarse grinding (rod mills) to fine grinding (ball mills). The ...
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Prediction of Bond's work index from field measurable rock …
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. ... Rapid determination of Bond rod–mill work index by modeling the grinding kinetics. Adv. Powder Technol., 24 (2013), pp. 441-445. …
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