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4.4.1 The Bond Rod Mill Work Index 21 4.4.2 The Bond Ball Mill Work Index 21 4.5 Bond Crushability Work Index and Abrasion Index () 22 4.6 Dry LIMS 22 4.7 Wet LIMS 23 4.8 Davis Tube Recovery (DTR) Testwork 23 4.9 Shaking Table 25 4.10 Wet MIMS and HIMS (HGMS) 25 4.11 Flotation 26 4.12 Selective Flocculation 27
4.2. Crushability tests 31 4.3. Downscaling the Bond grindability test 33 4.3.1. The original Bond grindability test 33 4.3.2. Approach to downscaling the Bond grindability test 34 4.4. Small scale grinding test 39 4.5. Linking comminution properties with mineralogy 42 4.6. GCT – The Geometallurgical Comminution Test 47
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.
• Grindability as indicated by the bond ball mill work index (BWi) ranged from 10–35 kWh/t, with the majority between 15 and 27 kWh/t. No clear relationships in terms A*b and/or BWi was identified with geological aspects logged from the drill core such as weathering, lithology, alteration, alteration intensity, veining or combinations of these.
The present work demonstrates that the outcomes of three of these tests, namely the Bond crushability index, the JK Drop Weight Test and the Los Angeles abrasion test, can be …
3.2 Bond crushability index An impact pendulum that follows strictly Bond's standard for crushability measurement [ 5, 32, 33] has been used, which allows …
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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 ton of the ore from a very large size to 100 um. …
The Bond Low-Energy Impact test can be used to determine the Crusher Work index (CWi), also known as the Impact Work Index. The test determines the impact energy at …
3.2 Bond crushability index An impact pendulum that follows strictly Bond's standard for crushability measurement [ 5, 32, 33] has been used, which allows calculating the crushing, or impact, work index.
The Bond crushability index is given by the median of the distribution (Bergstrom, 1985). It is used to calculate crusher power consumption from Bond's law of …
Uniaxial Compressive Strength MPa 6.9 to 21.4 Bond Crushability Work Index kWh/t 8.8 to 9.8 Bond Abrasion Index 0.03 to 0.05 Bond Rod Work Index kWh/t 10.0 to 10.2 Bond Ball Work Index kWh/t @ 212µm kWh/t @ 106µm 11.61 to 11.98 13.2 to 13.3 Scoping Mag Separation Test Feed Grade ‐% Fe Non Mag Grade ‐% Fe 52.3 45.5
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The Bond crushing work index is a measure of material strength and is determined using a simple twin pendulum apparatus and a standard procedure.
Bond (1952, 1960) defined the work index as "The com minution parameter which expresses the resistance of mate rial to crushing and grinding. Numerically the work index is the kilowatt hours per short ton (kWh/st) required to reduce the material from theoretically infinite feed size to 80% passing 100 /lIll."
The crushing work index (CWi), estimated on the basis of the twinpendulum test, has been proposed by Fred Bond and accumulates …
The Bond crushing work index is a measure of material strength and is determined using a simple twin pendulum apparatus and a standard procedure.
One reason for using Bond's third theory is that work index Wi has been measured and reported for many rocks. Using this relationship one can study the work input required for different feed sizes and work indices in the stages of comminution. In the current study Wi is held constant throughout the stages, although it may, in fact, vary.
The present work demonstrates that the outcomes of three of these tests, namely the Bond crushability index, the JK Drop Weight Test and the Los Angeles abrasion test, can be …
crusher were compared with those of the Bond crushing energies (estimated from the Bond crushability index) of the rocks. Also, the effect of the Bond crushability index on the estimated crushing energy of the rocks was studied. Materials and methods In this work, nine different rock specimens were obtained from some mines in Iran.
Results showed that the blasting process can reduce the Bond work index of fragments as much as 18% and enhances their crushability by 9.5%. Moreover, using different explosives brought about sensible changes in results, so that substituting ANFO with pentolite or emulite decreased the Bond index by 9.2% and 6.7% respectively, and …
An impact pendulum that follows strictly Bond's standard for crushability measurement [1, 5] has been used (Figure 1), which allows calculating the crushing, or impact, work index. The test consists of dropping two pendulum- mounted hammers simultaneously against individual irregularly-shaped particles of size ranging from 75 to 50 mm that are ...
Determination of Bond Work Index of Lucky Cement Limestone Pakistan - IJSER
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 required open-side settings ( jaw crushers and gyratory …
Bond's work index model of quantifying mineral grindability was born out of the desire for a better way of scaling up laboratory grindability test results to industrial-scale grinding mills (Lynch & Rowland, 2005). The Allis-Chalmers company (now ) collected a great deal of operating and laboratory data during the 1930s
This data showed a wide range in both crushability (=impact resistance) and grindability. • Impact resistance as measured by the JK parameter A*b ranged from a very hard 25 to a soft 118, although the majority were between 30 and 55. • Grindability as indicated by the bond ball mill work index (BWi) ranged from 10–35 kWh/t, with the
In this study, a crushability index (CI) was described from crushing test and the possibility of predicting UCS and BTS from this index was investigated. Strong and significant linear correlations were found between the CI and both the UCS and BTS. It is concluded that the UCS and BTS of rock can be estimated from the CI.
It can be concluded that employing explosives with higher VOD reduces the Bond work index of rock fragments and increases the throughput in the milling process, both of which correspond with lower energy consumption.
A summary of physical characteristics of the samples is given in Table 1, including results from standard crushability and grindability tests [3, 30], for reference. Bond ball mill work index values reported were obtained with a closing sieve of 150 μm, whereas the standard Drop Weight Test (JKDWT) A*b value was estimated on the basis …
Bond crushability work index has been calculated on the basis of impact load cell test results [13] and through correlations with rock mechanical properties [14]. Breakage models imbedded in simulations using the dis- crete element method (DEM) have evolved significantly in recent years, becoming powerful tools to predict breakage 123
Crushing mill work index is used in the SAGMILLING.COM Bond/Barratt specific energy consumption model . The work index is used to calculate the energy requirement to …
Bond ball mill work index values reported were obtained with a closing sieve of 150 μm, whereas the standard Drop Weight Test (JKDWT) A*b value was estimated on the basis of particles contained in the size range from 63 to 13.2 mm. Table 1. Physical characteristics of the samples. 3.2. Crushing tests
The actual value of particle fracture energy that each particle will be assigned when the simulation is initialized will vary according to the upper-truncated lognormal distribution [27], given by (1) P o E = 1 2 1 + erf ln E ∗ − ln E 50 2 σ 2 and (2) E ∗ = E max E E max − E where E is the specific fracture energy of the particle, which corresponds to …
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Perhaps the most traditional measure of rock crushability is the Bond impact work index. Measured using Bond's standard pendulum apparatus [5], it has long been used to aid in crusher...
Crushing mill work index is used in the SAGMILLING.COM Bond/Barratt specific energy consumption model . The work index is used to calculate the energy requirement to break rocks in the coarse size range, from >100 mm down to about 10 mm - 20 mm. Categories: Testwork Bond work index
For this reason, developing some models for estimating the rock strength from rock fragments will be useful. In this study, a crushability index (CI) was described and the predictability of UCS and BTS from the CI was studied. The sample preparation and testing method are easy in the crushability test. A small amount (500g) of crushed rock …
The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test. Its value constitutes ore characteristic and is used for...
