Rapid determination of Bond rod-mill work index by modeling the
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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Conversions between test types
A Non-standard rod mill result can be converted to a Bond rod mill work index by: Bond Wi RM = 0.49 × (Wi nonstandard)^1.17 Source: Dec 2021 Public Grindability Database Bond rod mill Wi versus A×b for copper porphyries A slightly better relationship can be determined if the database is limited to projects of a similar lithology. Limiting to ...
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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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Rapid determination of Bond rod-mill work index by modeling the
To calculate the Bond work index (W i) 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 …
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BOND RWi, BWi, CWi, Ai Work Index: What's the …
The Bond rod mill work index (Wi RM, or RWi) conducted from a feed size of approximately 10 mm to a product size on the order of 1 mm. The Bond crushing (impact) work index (Wi C, CWi, LEIT or IWi) …
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Fine Grinding
Bond proposed a different model which came to bear his name (Lynch & Rowland, 2005). Bond's work index model was empirically fit to the wide variety of data collected over the previous decades and was particularly focused on the ball and rod mills that were in common use at the time (Bond, 1952).
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Bond Work Index Procedure and Method
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. These equation application methods are used to …
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Comminution testing
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.
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Bond Work Index Formula-Equation
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 …
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Equipment Sizing: Crusher or Grinding Mill
The Work Index values listed in Table I and II apply directly to a wet grinding overflow type rod mill 7.5 feet in diameter in open circuit; and to a wet grinding overflow type ball mill 7.5 feet in diameter in closed …
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sbm/sbm bonds rod mill for work index.md at master
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Determination of work index in a common laboratory mill
In the Bond ball mill test, the work index is finally obtained. ... This was done by means of the Bond Ball Mill Standard test [24][25] [26]. In brief, with the aim to simulate closed circuit ...
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An Overview Of the SmAll-ScAle teStS AvAilAble tO …
3 Figure 2: Frequency of Bond Rod Mill Work Index (ARMC) Figure 3: SPI Profile Database (MinnovEX) The Bond rod mill work index is used to calculate the power requirement to grind from ~½" to about 14 mesh. The test has been mainly used for the design of rod mills or primary ball mills, but it can also be used along with the other Bond
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Bond Work Index
The Bond work index ( Bond, 1960) is based on Bond's law, which states that the energy consumed is proportional to the 1.5 power of particle size rather than the square of Rittinger's law. Accordingly, the energy consumed in reducing the particle size from x F to x p (both measured as 80% undersize) is given by.
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Bauxite grindability at elevated temperature in various mills
Namely, water and liquor reduced the Bond work index by 10% and 50% respectively. Chongbo and Bingchen (1992) developed a new method of simulating the calculation of the Bond rod mill work index by using the nth order grinding kinetic test data of the feed. Five kinds of ores (Fe ores, Pb-Zn ore, Au ore, Mn ore) were investigated …
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Metallurgical testwork demonstrates low-cost crushing and …
Bond Work Index – Rod Mill (RWi) The Bond Rod Mill index (RWi) is a measure of the resistance of the ore to grinding to a coarse product size. Table 4 shows the RWi for each composite – note that the oxide composite was not competent enough for measurement using the RWi test, and therefore
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Облигации rod mill for work index
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Bond ≠ Ball
The Rod mill work index is one type of a Bond work index, applicable to the size range of rod milling (very roughly, 12 mm to 1 mm). The Low-energy Impact Crushing work index is another Bond work ...
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20150821_Morrell_Method-GMG-ICE-v01-r01
The Morrell method uses hardness parameters obtained from the SMC Test® (SMC Testing Pty Ltd., 2015; Annex A) and the Bond Ball Mill Work Index Test (GMG, 2016a). The sampling and surveying guideline (GMG, 2016b) provides additional detail on how to collect the required data, and is critical to this analysis.
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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. Source 6 Source 6 KWh/t Source 6; Avg RW Index: Rod Mill ... Rapid Determination of Bond Rod-mill Work Index by Craig Taylor on Scribd . by David Michaud May 13, 2021 …
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Metals | Free Full-Text | Variability Study of Bond Work Index and
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 relationship between wi and grinding …
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Procedure for determination of ball Bond work index in the …
Section snippets Grinding kinetics in the Bond ball mill. Tests of grinding kinetics in the Bond ball mill (Fig. 1, Fig. 2) has shown that over a shorter grinding period, the process follows the law of first order kinetics R = R 0 e-kt where R = test-sieve oversize at the time (t); R 0 = test sieve at the beginning of grinding (t = 0); k: grinding rate …
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A quick method for bond work index approximate …
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). Determine the starting ...
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(PDF) Variability Study of Bond Work Index and Grindability Index …
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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Empirical conversions, SPI™ & SGI
The tests that fall in the same size range as SPI & SGI are the Bond rod mill work index test and the two Drop Weight Tests (combining JK DWT and SMC Test™). ... 0.92 for the rod mill work index ...
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Comparison of Ore Hardness Measurements for Grinding Mill …
that the Bond CWi and the standard Bond BM Wi both recorded average values of 8 kWh/t, it was surprising that the Bond Rod Mill Wi average was 11.3 kWh/t. Since the ore is unusually soft, the Rod Mill Wi is probably irrelevant in determining required power for the SAG mill. Drop Weight Tests Drop Weight tests were done at Hazen and …
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Determining the Bond Efficiency of industrial grinding circuits
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 of six 31.8 mm and two 44.5 mm diameter steel rods, all 533.4 mm in length, and weighing a total of 33,380 g.
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Determining the Bond Efficiency of industrial grinding circuits
W Specific energy (work) input (kWh/t) Wi Bond Work Index (kWh/t) WiBM Bond Ball Mill Test Work Index (kWh/t) Wic Bond Impact Crushing Test Work Index (kWh/t) WioACT …
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Technical Information
In conjunction with the Bond ball mill work index they can be used to accurately predict the overall specific energy requirements of circuits containing: • AG and SAG mills. • Ball mills • Rod mills • Crushers • High Pressure Grinding Rolls (HPGR) ... The recommended size fractions are: -31.5+26.5mm, -22.4+19.0mm, -16.0+13.2mm. As the ...
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Bond Work Index (Energy equation) (3 replies and 2 comments)
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). It would look like this: ... The Bond's Work Index equation is: W=WI* (10/√P80 -10/√F80) where. W= the energy input (Work input) per ton, kwh ...
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