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 …
The Bond work indices of the admixtures containing a softer component (kaolin) were found to be greater than the weighted average …
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 samples …
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.
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 samples …
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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 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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HGI test results were compared with the PSD results. A new method for the prediction of HGI of limestone samples from both of the quarries (Quarry-1 and Quarry-2) was proposed. Significant correlation (R 2 = 0.84) was obtained with D 90 size parameter. In terms of grinding energy calculations, Bond Work Index (BWI) was taken into …
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. Although considered an industry standard, Bond did not fully define that procedure, and therefore significant discrepancies in test results can sometimes be …
Bond Rod Index Mill, 12" x 24" consisting of a one (1) piece cast shell complete with integral wave, 1 Hp 3/60/220 volt motor/gear reducer drive, support frame which allows the mill to tilt +/- 5 degrees during operation and 45 degrees for discharge (manual operation), receiving pan, rod charge and control panel complete with digital revolution counter, …
Anyone wondering how Bond ball mill work index compares versus SPI or JK A*b? Well, M. Doll says, several comparisons have been published, such as at CMP 2011 and Procemin 2009 and in …
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.
When Erf/Erp is greater than 1.29, the work index increases as the product size decreases, and when Erf/Erp is less than 1.29 the work index decreases. Eq. (8) suggests that a standard work index Wi100, or the work index at 80% passing 100 microns calculated from the exposure ratios, can be found from the following Eq. (9):
As a fast method, the determination of the Bond index from the Hardgrove index (by calculation) is almost matching with measured Bond's work index. The Bond's work index of the above rock samples ...
Among all seven samples collected from the different faces of quarry, Bond work index of limestone Face-4A results less than 20kwh/t, remaining 6 samples are marked as hard rock because of high ...
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. ... Determination of the Bond Work Index using an ordinary laboratory batch ball mill. A.L. Mular (Ed.), ...
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 …
International Journal of Mineral Processing, 27 ( 1989} 125-132 125 Elsevier Science Publishers B.V., Amsterdam -- Printed in The Netherlands A Procedure for Rapid Determination of the Bond Work Index N. MAGDALINOVIC University of Belgrade, Technical Faculty at Bor, 19210 Bor (Yugoslavia) (Received November 24, 1987; …
Bond's work index model of quantifying mineral grindability was born out of the desire for a better way of scaling up laboratory grindability test results to industrial-scale grinding mills (Lynch & Rowland, 2005). The Allis-Chalmers company (now ) collected a great deal of operating and laboratory data during the 1930s
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 ...
The fragility of ore depends upon its strength. In a crushed product or mining product, the fragile ore degen-erate to a undesirable fine product during blasting, excavation, loading and transportation. 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 …
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 …
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 …
Bond's work index, also known as Bond grindability index (BWI), is a measure of material grindability in the mining industry. It is used to determine the energy required to grind a material to a ...
By Bond grinding, the Bond Work Index of the limestone sample was 14.45 kWh/t. During the determination of the Hardgrove Grindability Index (HGI), 50–50 g limestone samples from the …
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%. ...