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The bond work index of granite is expected to be the highest due to the ore being mostly composed of the hard mineral quartz. Bond Work index values of granite presented in literature range from around 14-15. …
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This paper presents the experimental results of the Bond work index values ob- tained by the standard method on limestone and andesite samples, as well as composite …
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The traditional Bond work index proposed by F.C. Bond over 60 years ago is still today a useful tool for characterizing material crushability and grindability in the minerals industry.
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The Bond Work Index of limestone typically ranges between 11-13 kWh/ton. ... A bond index is a way of measuring the value of a portion of the bond market. It's computed from the prices of selected ...
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Relationship between Bond's work index (Wi) and uniformity constant (n) of grinding kinetics on Tower mill milling limestone ... 79–87 87 measurements were made for 1 h and an average value of 0.720 was found for n and 0.073 for the rate constant K calculated from ln K. Table 1 reports the results of measurements made on 22 various samples of ...
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The Bond Abrasion Test determines the Abrasion Index, which is used to determine steel media and liner wear in crushers, rod mills, and ball mills. Bond developed the following correlations based on the …
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Even though not practical mixtures such as C 100 G 0 were evaluated in this work, this was purely from a mathematical point of view in order to obtain a better sampling of the independent variables (i.e. the mixture composition) using a simplex-centroid design.. Resistance to Grinding. A total of 700 ml of each blend were introduced in a 0.30 m cast …
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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 ...
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The present investigations have shown that a relationship could be established between the Bond's work index (W i) and the grinding kinetic constant n …
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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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The Importance of Work Index in Mineral Processing. 13. Limestone. 16. Gold Ores. The kilowatt-hours per tone (kWh/t) will work out your work index. The number of kittowatts consumed in a hour divided by the tonnes of rock gives you your work index. Remember, the higher the Work Index the more work required to crush the rock.
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The Bond work index is a research methodology, which is widely used for the estimation of power required to grind the materials. Keeping in view the difficulty in determining this index, many alternatives to the standard method have been explored by
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The Bond work index (BWI) is a well-known method used when selecting comminution equipment, to evaluate the grinding efficiency and to calculate the required grinding power.
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A minette-type oolitic iron deposit in the Peace River district, Alberta, occurs as flat-lying ironstone beds up to 10.6 m thick which contain 32-34 wt. % Fe in situ or 36-38 wt. % Fe after drying ...
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Bond's work index is very useful in blasting and communition process, but its determination is very lengthy and cumbersome process • Bond's work index is …
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In this study, limestone samples (a total of 108 sample) were collected from two limestone quarries. The collected samples were initially in the form of palm sized and they were crushed to −2.36 mm. Grinding experiments were conducted in standard HGI (Hardgrove Grindability Index) mill and Ring mill.
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by calculating an operating work index where the SEC (E), feed size (F80), and product size (P80) are measured, and the work index (Wi) of the operating industrial circuit is then calculated. The operating work index is useful for performing comparisons of energy efficiency that are corrected for different amounts of size reduction. 2.
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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 ...
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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.
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This paper investigates grinding of mineral mixtures with different grindabilities in the Bond ball mill. Understanding the ore mixture grinding is of great importance in mineral processing. The energy required for …
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These are Basalt, Limestone and Weathered Shale. The typical values of these types of rock materials are summarized in Table 2, below. Table 2: Rock types and geotechnical properties Note: Typical values for unit weight and UCS int / m i are taken from international literature and RocLab software (RocScience), respectively.
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Learn what Bond's work index is and how it relates to mineral grindability, specific energy consumption and power models. Find out the differences between laboratory, operating …
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Download Table | Characteristic parameters and the Bond Work Index for limestone samples from publication: Laboratory testing the grindability of carbonate mineral raw material of the site Spasina ...
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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 …
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Learn how to calculate the Bond Work Index, a measure of the energy required to grind a material, from different tests and size distributions. See examples, equations, and tables of Bond Work Index …
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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 …
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The grindability of an ore in the process of mineral dressing can be determined by use of the Bond work index ... andesite and limestone. The values obtained by this procedure do not differ by more than 7% from those obtained in the standard Bond test. A final appraisal of the reliability of the proposed procedure can …
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A quick method for the Bond work index approximate value determination, which is based on the first order grinding kinetics, is presented in this paper. Comparative experiments for the Bond work index value determination using the standard and quick procedures were carried out on samples of limestone and andesite, and on composite …
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The Bond work index (BWI) is a well-known method used when selecting comminution equipment, to evaluate the grinding efficiency and to calculate the required grinding power. ... but did not give values for the proposed function. Also, it has not been shown that this proposal is applicable for grinding up to less than 100 µm. Ozkahraman …
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