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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 crushers) or closed-side settings (cone crushers) for a given product size.P80 = …
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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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The Bond low-energy impact test, also named impact work index or Bond impact crushing work index, can measure the crushing work index (CWI) and describes …
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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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S 1 = Friability value (%) BWI H = Bond's work index calculated from Hardgrove grindability (kWh/Ton) ... Laboratory determined BWI values for limestone are given in Table 17. Average BWI determined in the lab and the calculated BWI values using Eq. (24), (25), (26) are very close. This analysis further strengthens the validity of the …
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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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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 this, a mill grinding 30 t/h clinker, will grind 30 x 1.40 = 42 t/h of marl or 30 x 0.6 = 18 t/h of silica sand. The grindability index of rotary kiln …
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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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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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The coatings were tested in accordance with the standards for this type of refractory A c c e p t e d M a n u s c r i p t materials, 18,19 and with respect to our previous works in this field, 11 ...
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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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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 present work seeks to establish a relationship between Bond's work index (W i), indexes n, for a limestone sample that originated from, seven 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,typical ...
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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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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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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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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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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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Friability of rocks and ores can be determined by brittleness tests. A test apparatus to determine friability value has been designed to suit limestone strength characteristics used in cement production.The friability values of barite, marble, limestone and bauxite have been determined and compared with the corresponding Bond work …
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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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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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Maxson et al, (1933). It was extended by Bond (1952) to provide a work index result that was empirically calibrated to make a laboratory work index match the corresponding work index measured in an industrial grinding mill. The fitted equation, in metric form, is given as Equation (1). (1) 𝑊𝑖= 1.1023×44.5 𝑃100 0.23× À0.82×(10 √ ...
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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 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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Bond work index determination: ... Limestone 2,131 156 200 3.0650 8.99 ... (Bond, 1952). Figure 3 — Work index values calculated with both mills for different minerals.
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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 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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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 higher the Work Index the more work required to crush the rock. The amount of energy required to do this work is important to understand to maximise efficiency. ... Typical Values for Crushing Work Indices. Crushing Work Index. Material. 8. Clay. 13. Coal. 22. Basalt. Crushing Work Index. Material. 17. Iron Ore. 14. Copper Ores. 3. …
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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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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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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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Bond work index value of these components mixtures is greater than the Bond work in-dex of harder components, clinker. Oner (2000) have conducted a research of clinker and blast furnace slag mixture Bond Work Index in different mass propor-tions. He found out that these values are always lower than the Bond Index obtained as the mean …
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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 value of the bond work index of the above samples has shown a variation from 10.8 kWh ton 1 for bauxite (high abrasion value and low compressive strength) to 20.4 kWh ton -1 for granite (low ...
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