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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. ... resulting in relatively high operating costs in a typical mineral …
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What is the Bond Work Index Formula-Equation? In case you had forgotten, here is a classic: What is the Bond Work Index Formula-Equation? ... For 150 mesh the average P value is 76 microns, for 200 mesh it is 50, for 270 mesh it is 32.3, and for 325 mesh it is 26.7. These average values can be used when P cannot be determined from …
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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 predicted using simple field measurable parameters like density, compressive strength and Protodyakanov's strength index.
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Values of the Bond work index for common ores and minerals. ... A crusher fed at the rate of 1 ton per hour is used to comminute cubes of 10-mm limestone to a product with size composition of 75% retained on 3-mm screen, 15% retained on 2-mm screen, and 10% retained on 1-mm screen. ... The first step is to determine the average …
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Determining the Bond work index value is quite complicated, time-consuming and requires trained operating personnel and therefore is subjected to errors. A quick method ... determination using the standard and quick procedures were carried out on samples of limestone and andesite, and on composite samples containing both ores in different …
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In general, Bond's work index is used to determine the grinding efficiency and also to calculate the power requirement. The process is very time consuming and it requires skilled labor and specialized mill. A systematic investigation was carried out to predict Bond's work index using simple field measurable properties of rocks.
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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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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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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 index (W i) and grindability index (G) of these materials. The …
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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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ξ value of the Geological Strength Index GSI for the rock mass. Intact rock properties For the intact rock pieces that make up the rock mass, ... granodiorite, limestone, marble, rhyolite, tuff R4 ; Strong: 50 - 100 2 -4 Specimen requires more than one blow of a : geological hammer to :
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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 wear rate in pounds of metal wear/kWh of energy used in the comminution process. Determining rock abrasivity in the laboratory ref
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