The work index values of the Magdalinovic method agree with this average Bond work index because the method does not simulate the recycling of harder components into the mill charge. On the other hand, the work index obtained using the standard Bond test shows the weighting of the work index towards the harder component as a result of the ...
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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 Bond's Equation. Bond Work Index for Testing Procedure. Cleaning and Storing of Ball Mill Charge after the Bond Work Index Procedure is done:
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The mass loss in grams of the wear paddle is the Abrasiveness Index (Ai), which is typically reported as the average of duplicate measures (Bergstrom, 1985). The resulting value of Ai may be used to classify the rock in regard to its abrasiveness ( Table 1 ), besides predicting wear of crusher and mill liners and grinding media using several ...
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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 made up …
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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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To estimate the corresponding value of UCS, an index-to-strength conversion factor is established from existing data from several project sites in Kuala Lumpur, for the typical bedrock formation, namely Granitic rock and Limestone. ... it was observed that most of the collected data lies in the typical range of PLT index between 2 MPa and 5 MPa ...
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A meaningful expression between bond work index, grindability index … Conversion of this value to operation of the mill for the Bond Work index test results in a value of 194 ∗ 10 −7 kWh/mill revolution. ... This value reflects a medium-high level, similar to that required for grinding an average limestone [29].
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'Work Index' is the amount of energy required to do this work. It is a measurement of how hard the rock is and an expression of the resistance that a material has to crusher. Shown in the table below is typical Work Index, reflecting the different …
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In order to address the comminution behavior of rocks, mostly addressed index is HGI, i.e. Hardgrove Grindability Index. Although HGI is evaluated in most cases to understand coal comminution behavior by many researchers [12, 13, 19, 41, 50, 53, 63], still some other researchers [29, 51] have employed HGI in terms of carbonates and limestones.Aso et al. [6] …
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The work index for limestone is 13.03kwh/t. (10 marks) Gauth AI Solution ... This means the average product size is approximately 3175 um. Therefore, the SRR is: Text. Copy. SRR = Feed size / Product size = 50800 um / 3175 um = 16. Calculate the power required using the Bond's work index equation. Bond's work index equation relates the power ...
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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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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 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 …
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According to FHWA0-IF-03-017 [3], "Typical values of ultimate bond for drilled and grouted nails installed in various soils and using different drilling methods are presented in Table 3.10. The values in this table correspond to gravity grouting only. ... These are Basalt, Limestone and Weathered Shale. The typical values of these types of ...
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For example, E S = 1.27, 0.705, and 0.548Jm −2 for graphite, quartz, and average feldspar, respectively (Brace and Walsh 1962;Zhang and Ouchterlony 2022).
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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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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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Analysis of limestone, water & instrument air ... Lime-Stone For design purpose, Bond Work Index of 13 KWH/Short Ton to be considered. Process Water Cooling Water Water Source ... DESIGN LIMESTONE ANALYSIS % by Weight Constituents as SQ Iron Alunnvm caco Mgco, Others Inherent tvþisture Content Bond Wor* unit Analysis '2 15-2.2 Below Analysis 7 ...
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The friability values of barite, marble, limestone and bauxite have been determined and compared with the corresponding Bond work index (Wi) and grindability index (G) of these …
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The closed circuit 80% passing size P averages P1/log 20 for all sizes larger than 150 mesh. 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 screen analyses. In the A-C rod mill grindability test
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Bond's Work Index is typically expressed in kilowatt-hours per ton (kWh/ton). It represents the energy required to reduce a material from infinite size to 80% passing a specific …
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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 samples ...
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limestone samples of which SHR value determined was tested in terms of grindability characterization. In addition, mechanical ... (Hardgrove grindability index) and BWI (bond work index) are the most employed tests. Although many processes require pulverized limestone as raw material, neither HGI nor BWI has been taken into con-
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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 fragile ore degenerates to superfine.
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Table 1 The Bond work index values obtained by standard the Bond procedure and values calculated according to the mass fraction of the sample components Sample Limestone : andesite 100 : 0 Limestone : andesite 75 : 25 Limestone : andesite 50 : 50 Limestone : andesite 25 : 75 Limestone : andesite 0 : 100 No. 3-4, 2017 Test sieve, Wi, µm kWh/t ...
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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 samples containing both ores in different mass proportions. This quick procedure can be performed with an arbitrary number of milling cycles, depending on the desired ...
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For the analysis of heavily jointed rock slope, equivalent continuum model is adopted and slope stability analysis can be performed using Hoek-Brown (HB) failure criteria.
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The study is focused on comminuting behavior of limestone and calculation of energy requirements for the effective production of ultra-fine particle up to mesh liberation at Lucky …
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The value of 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 ... The stress strain curve for each sample is plotted. The average value of the compressive strength as well as modulus of elasticity was estimated as mentioned in the ...
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The Bond work indices of the admixtures containing a softer component (kaolin) were found to be greater than the weighted average of the …
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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 energy consumption and low grindability rate.
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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 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 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 ... Determination of Bond Work Index of Lucky Cement Limestone Pakistan. ABDULLAH Qureshi.
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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 index (W i) and grindability index …
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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 …
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This Table of Ball Mill Bond Work Index of Minerals is a summary as tested on 'around the world sample'. You can find the SG of each mineral samples on the other table.
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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 models ...
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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) analyzes were carried …
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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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