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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 industrial …
Similarly in a crushing and comminution process by crusher, ball mill or rod mill, as the ore of high strength attains to a desired size, the fragile ore degenerates to superfine. ... M K and Rath, R K (2012) Determination of Shatter Index, Tumbler Index and Bond work Index of Limestone. Training Report (TR). CSIR -NML, Jamshedpur. (Unpublished ...
It can be seen from Table 1 that the cal- culated values of the Bond work index are slightly different from the experimen-tally obtained values. Maximum difference be- tween these values is 3%. ...
The SAG mill product is then crushed to passing 3.35 mm and is subjected to a standard Bond ball mill work index (S d-BWi) grinding test to provide the total pinion …
In this study, the effect circulating load (CL) and test sieve size (Pi), which are inaccuracies of Bond grindability, on the Bond ball mill grindability (Gbg) and work index (Wi) based on four ...
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 ...
in t he f ollow ing rat ios: limestone : andesite = 25 : 75, limestone : andesite = 50 : 50, limestone : andesite = 75 : 25. The Bond work index determination. according to the standard Bond's ...
Experiments were carried out in a closed wet-grinding circuit as shown in Fig. 3, using the 44-cm diameter Tower mill KM-5, charged with steel balls of 20-mm diameter weighing in a total of 350 kg.This mill was filled with 64 kg of limestone ore sizing −5+0 mm, and the rotation of the screw was settled at 85 rpm.
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 …
In the Bond ball mill test, the work index is finally obtained by 023 w ... Figure 3 — Work index values calculated with both mills for different minerals. Limestone 2,131 163 200 1.467 9.05
(13) gives the relationship between the Bond's work index (Wi), the uniformity constant (n) and the rate constant (K) that would be used to determine the size of the mill. Fig. 4. A test result of a limestone sample on KM-5 Tower mill. 85 S. Nitta et al. / Int. J. Miner. Process. 66 (2002) 79–87 3. Validation of the relationship between Wi ...
Some other scientist proposed method that is using specially designed mills smaller than the Bond mill and, therefore, the required amount of the sample is much smaller [11-13]. The other scientists focus their investigations on mathematical algorithms [14-16] and mathematical correlations[17] that helped them to calculate Bond work index
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The Bond work index of limestone and andesite mixtures. This paper investigates grinding of mineral mixtures with different grindabilities in the Bond ball mill. Understanding the ore mixture grinding is of great …
In the literature, it is noticed that the work index (W i ) of industrial mills varies between 8 and 20 kWh/t [79][80] [81] applied to various types of mineral admixtures. Utilizing this …
DOI: 10.5937/MMEB1704021T Corpus ID: 55235386; The Bond work index of limestone and andesite mixtures @article{Todorovi2017TheBW, title={The Bond work index of limestone and andesite mixtures}, author={Dejan Todorovi{'c} and Zoran Bartulovi{'c} and Vladimir Jovanovi{'c} and Branislav Ivo{vs}evi{'c}}, journal={Mining and Metallurgy …
In the Bond ball mill test, the work index is finally obtained. by. w. ... clinker, limestone, fluorspar and granulated copper slag. Ore sample preparation. To perform the Bond test, samples.
The Bond's Ball-Mill Work Index is a measure of the resistance of the material to grinding in a ball mill. This Index is widely used in the industry for comparing the resistance of different materials to ball milling, for estimating the …
The tested rock sample of a 500 g aggregate in the fraction 11.2–16.0 mm was inserted into the mortar.The friability value S 7 equals the percentage of undersized material, which passes through the 11.2 mm mesh after the aggregate test crushing in the mortar by weight-drops, the mean value for a minimum of three to four parallel tests …
THE BOND WORK INDEX OF LIMESTONE AND ANDESITE MIXTURES** Abstract This paper investigates grinding of mineral mixtures with different grindabilities in the Bond ball ... value is found in a laboratory Bond ball mill by simulating dry grinding in a closed circuit until the 250% circulating load has been achieved (Magdalinovic, 2003).
Quick method for bond work index approximate value determination 325 different raw materials. For two grinding cycles 𝑃80 𝑃2 80 ranges from 1.012 to 1.058.
Deniz (2004) [22], presented the relationship between Bond's grindability and breakage parameters of grinding kinetic. He conducted grindability test on 6 limestone samples taken from different regions of Turkey and found the following relation between breakage parameter (S i, a T, β and γ) with correlation coefficients of 0.96, 0.92, 0.90 …
In this study, limestone samples (a total of 58 sample) were investigated in terms of their grindability and chemical composition. Grindability tests were carried out on standard HGI mill.
The following table indicates some typical figures, and a relative measure of work index. TABLE 2 USUAL VALUES OF BOND WORK INDEX Fig. 3. Ball Mill Talking about calculations, the speed of rotation is 70 rpm and sieves are also required. The material having weight of 700cc volume sample with the balls was charged into the ball mill.
1. A grindability measurement made in a laboratory work index apparatus, such as a ball mill work index (WiBM) or a rod mill work index (WiRM) 3. An operating work index (WiO): A measurement of a specific energy consumption and size reduction in an operating plant. 4. A generic work index that represents an intrinsic ore breakage characteristic ...
4.1.1. Mixture of 75–25% limestone–corundum. The first mixture contains 75% limestone and 25% corundum in weight, the results of these measurements can be seen in Fig. 1.. It is observed that in the first and second grinding cycles the initial 75% limestone content increased significantly to the rate of 86–89%.
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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 ...
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 4.75mm to 212µm. Abrasion Index Test.
The energy required for crushing and grinding is presented by the Bond work index and is determined by means of Bond grindability test. This paper presents the experimental results of the Bond work index values obtained by the standard method on limestone and andesite samples, as well as composite samples made up from these ore in different ...
No. 3-4, 2017 Mining & Metallurgy Engineering Bor25 Figure 4 The limestone content in circulating load during the standard Bond test on samples with the composition limestone : andesite = 25: 75 ...
Generally Bond work index for mill dimensioning and controlling is measured by grinding a feed material of less than 3.36 mm (− 6 mesh) particle size under standardized conditions in a Bond's mill (Diameter × Length = 305 mm × 305 mm). Bond's method simulates closed-circuit grinding which is carried out in sections until the …
The computation of a Bond ball mill work index was empirically calibrated by Fred Bond using a short ton basis. The modern (metric tonne) basis is the following equation: Derived values composed from Wi BM results. Morrell Mib value is calculated for a sample if the following are available: umClosing, F80, P80, gpr.
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 …
Generally Bond work index for mill dimensioning and controlling is measured by grinding a feed material of less than 3.36 ... Bond's grindability index and …
Firstly, Standard Bond's grindability tests were made for six limestone samples. Result of tests, Bond grindability values of limestone samples were 6.14 g/rev, 2.89 g/rev, 2.58 g/rev, 2.48 g/rev, 2.42 g/rev and 1.54 g/rev, respectively. The standard set of grinding conditions used is shown in Table 2, for a laboratory mill of 6283 cm 3 …
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).