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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 to the work represented by the product
·The Bond ball mill grindability test is run in a laboratory until a circulating load of 250% is developed It provides the Bond Ball Mill Work Index which expresses the resistance of material to ball happens after 7 10 grinding cycles which shows that the procedure is a lengthy and complex one and is therefore susceptible to procedural errors
·Grindabilit v characteristics of a limestone sample according to Zeisel s method 36 The Zeisel test Zeisel 1953 Lehmann and Haese 1955 Bernutat 1961 Ellerbrock 1975 The Hardrove mill was developed originally for coal grinding work index is Wi= V h kWh/sht 100 h being the mesh size in microns of test sieve
International Journal of Scientific & Engineering Research Volume 8 Issue 6 June 2017 ISSN 2229 5518 1938 Determination of Bond Work Index of Lucky Cement Limestone Pakistan Niaz Muhammad Shahani Zhijun Wan Abdullah Rasheed Qureshi Muhammad Ali Naseem Ali Abstract—The Bond work index is a research methodology which is widely used for the
If 20% of pulverized limestone with a work index of kW hr/ton is retained by a 150 mesh screen from an original uniform size of 35 mesh what is the energy required in kW to process 1ton/hour A B C D
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
·In this study limestone samples a total of 108 sample were collected from two limestone collected samples were initially in the form of palm sized and they were crushed to − mm Grinding experiments were conducted in standard HGI Hardgrove Grindability Index mill and Ring mill PSD Particle Size Distribution analyzes were carried
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 results of the Bond work index values obtained by the standard method on limestone and andesite samples as well as composite samples made up from these ore in different
·In this study two limestone quarries namely Quarry 1 and Quarry 2 were investigated in terms of the Schmidt Hammer Rebound SHR distribution A total of 518 points 158 points for Quarry 1 and 360 points for Quarry 2 were tested and evaluated in terms of SHR respectively Both quarries were represented with their corresponding SHR distribution
·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 = was obtained with D 90 size parameter In terms of grinding energy calculations Bond Work Index BWI was taken into consideration
·Limestone is a sedimentary rock primarily composed of calcium carbonate CaCO3 in the form of mineral calcite or is one of the most common and widely distributed rocks on Earth with a wide range of uses in various industries and natural settings Limestone forms through the accumulation and compaction of marine organisms primarily the
·The work index for limestone is kWh/ton what will be the power required in HP up to three decimal places 00 27 270 kW of power is required to crush 150 tonnes/h of a material If 80% of the feed passes through a 50 mm screen and 80% of the product passes through a 3 mm screen calculate the work index of the material
·Geometallurgical modeling of the production benches is an attempt to estimate the geometallurgical variables of the different ore domains which leads to a better understanding of the ore and its properties Having geometallurgical variables results in a more accurate prediction of ore characteristics an improved drilling and blasting operation and better
·For the evaluation of laboratory and industrial experiments the work index can be determined as follows BWI = P 1 × G 10 P − 10 F where BWI = Bond s work index kWh/sh Ton F = 80% passing size of original feed μm P = 80% passing size of circuit product μm P 1 = Test sieve size μm and G = Net grams of sieve
·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 friability values of barite marble limestone and bauxite have been determined and compared with the corresponding Bond work index W i and grindability index
The results Average work index of limestone are kWh/ton in Donghae Samcheok and kWh/ton in Jecheon Danyang Jecheon Danyang limestones were about 20% lower than Donghae
·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
·The bonding index for iron ore low grade and high grade limestone and pozzolan were calculated to be and Kwh/t respectively In order to investigate the relationship
Fig 4 A test result of a limestone sample on KM 5 Tower mill 85 S Nitta et al / Int J Miner Process 66 2002 79 87 3 Validation of the relationship between Wi and n through experiment Measurement of the Bond s work index Wi In Japan the Bond s work index Wi measurement abides basically by the JIS M 4002 regulations
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Question If 20% of pulverized limestone with a work index of kW hr/ton is retained by a 150 mesh screen from an original uniform size of 35 mesh what is the energy required in kW to process 1ton/hour Suppose you want to crush the material further until 80% passes through a 400 mesh screen what energy is required
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%
Request PDF Relationship between Bond s work index W i and uniformity constant n of grinding kinetics on Tower mill milling limestone In the theory of grinding kinetics the grindability
