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 …
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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 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 calculated ...
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—, 2 and 3 show the grinding product composition changes during the Bond's grinding tests performance using the test sieves 74, 105 and 150 microns on limestone and andesite composite samples with ...
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— THE EXPERIMENTED AVERAGE VALUES OF . BOND WORK INDEX . International Journal of Scientific & Engineering Res earch, ... Bond work index of limestone Face-4A results less than 20kwh/t, remaining 6 ...
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Grinding work index according to Bond The work index values apply to ball mills grinding wet in closed circuit. For dry grinding in closed circuit the work input calculated by Bond's basic Third Theory equation should be mul tiplied by 1.30 (see example 6.3.1.).
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Ore grindability is represented by the Bond work index value [6] and Mucsi et al. [5] have summarized the most widely known and utilized grindability tests as Bond, Hardgrove and Zeisel...
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— Sizing a crusher can be done reliably calculated thanks to the Impact/Crushing Work Index and the testwork research done by Fred Chester Bond and his 1952 paper. According to Bond's Third Theory of Comminution, the work/energy input is proportional to the new crack tip length created during particle breakage and equivalent …
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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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— Basic Equations. The basic work index equation is: W = 10 Wi/√P – 10 Wi/√F…………………………………………………………………………
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The Bond work index (Bond, 1960) is based on Bond's law, which states that the energy consumed is proportional to the 1.5 power of particle size rather than the square of …
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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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— 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 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. Glass ...
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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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— In some cases, utilities will provide a value for MgCO 3 utilization; typical values range from 20% to 35%. Research and development projects aimed at developing a correlation for predicting the ...
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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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— 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. PSD (Particle Size Distribution) …
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Typical values of uniaxial strength (in MPa) for nine common rock types (after Johnson and Degraff, 1988). ... (MPa) Compressive Strength (MPa) Limestone Sandstone Sandstone Sandstone Mudstone Limestone Limestone Ironstone Sandstone 18.00 ± 0.62 (20) 19.17 ± 0.21 (23) 23.10 ± 0.48 (19) ... related to the point load index with 50 mm cores ...
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— Same authors [51] have emphasized the easiness of the HGI measurement compared to Bond Work Index (BWI). In spite of this fact abovementioned, ... this is not only the aim of this paper to reveal the relationships between size parameters and HGI values for limestone samples. As it was detailed in Introduction, BWI is mostly regarded in …
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The Bond work index of limestone and andesite mixtures
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A QUICK METHOD FOR BOND WORK INDEX APPROXIMATE VALUE DETERMINATION Dejan TODOROVIC *, Maja TRUMIC**, Ljubisa ANDRIC, ... Andesite and limestone samples were prepared by crushing in a laboratory jaw crusher and roll crusher in a closed cycle with screening to size -3.327 mm., (, (. ...
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— 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 …
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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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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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List of symbols G grindability coefficient [g/rev] n Bond grinding cycle number [pc] cL limestone content [%] limestone content of the product [%] cLP limestone content of the feed [%] cLF x80 80% passing particle size [μm] Wi,B Bond work index measured with the traditional Bond test [kW h/t] Wi,B,Karra Bond work index calculated with the ...
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Typical F 80 size Typical P 80 size 2440 µm 75-300 µm Models: Bond models, SGI, Morrell Mi The Bond ball mill work index is one of the most commonly used grindability tests in mining, ... and the work index value changes if the test is performed to a …
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— Swain and Rao (2009) used Hardgrove index and friability value (S 1) to establish correlation with BWI of partially kaolinised khondalite (A Bauxite mine waste) and found the following correlations with correlation coefficient of 0.9348 and 0.9944 respectively: BWI = − 18.193 ln S 1 + 66.747 BWI H = 0.9982 BWI where, BWI = Bond's …
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— Calculate and record the K80 value. BOND Work Index Calculations: Calculate the average value of the last three cycles Net/Rev; Record the value. The Work Index (BWi) is calculated according to Fred …
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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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— The Bond work index can be determined by many ways, some of them are as follows: with the traditional standard method in a (1) Bond-ball mill or in a (2) …
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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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