Comparison of measures of rock crushability

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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Characteristic parameters and the Bond Work Index …

The present test results (Table 3) indicate that the value of the Bond Index ranges be- tween 5.9 and 6.4 kWh/t. It can be seen that the deviations, which means slightly higher values...

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A quick method for Bond work index approximate value …

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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The Bond work index of limestone and andesite mixtures

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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For design purpose, Bond Work Index of 13 KWH/Short Ton …

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 Bond work index of limestone and andesite mixtures

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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The Importance of Work Index in Mineral Processing

'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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(PDF) Quick Method for Estimating Bond Work Index

Appendix A. Determination of Bond work index approximate value by the quick method on limestone : andesite = 25 : 75 sample with two grinding cycles Sample was prepared according to the Bond standard method. ... The obtained approximate Bond work index value by quick method was: 332 𝑊𝑖 = 1.1 ∙ D. Todorovic, M. Trumic, L. Andric, V ...

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QUICK METHOD FOR BOND WORK …

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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A new approach to the calculation of bond work index

Morrell (2004) proposed an alternative energy-size ratio for particles of (− 100 + 0.1) mm in relation to Bond, based on the particle size exponent which is a function of the size of the initial sample and the grinding product, but did not give values for the proposed function.

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Ultimate Bond Strength of Anchors in Rock | Geotechpedia blog

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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A meaningful expression between bond work index, grindability …

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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Rock point load test (PLT index) and its correlation with rock …

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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Solved: Calculate the power required to crush 100 tons/hr of limestone

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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Bond Work Index Formula-Equation

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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STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES

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Producer Price Index by Industry: Crushed and Broken Limestone …

Graph and download economic data for Producer Price Index by Industry: Crushed and Broken Limestone Mining: Crushed and Broken Limestone (PCU2123122123120) from Dec 1983 to Jan 2025 about mining, PPI, industry, inflation, price index, indexes, price, and USA.

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What is the bond work index of limestone?

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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Average Bond Work Index in kJ/kg for some minerals and rocks.

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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Characteristic parameters and the Bond Work Index …

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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A quick method for bond work index approximate value determination

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 grindability in terms of HGI and a new approach for the

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 Bond work index of limestone and andesite mixtures

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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, Estimation of Bearing Capacity Values in Jointed Limestone …

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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Prediction of Bond's work index from field measurable rock …

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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Limestone grindability in terms of HGI and a new approach for the

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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Bond Work Index

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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Typical Value For Bond Work Index For Limestone

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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The Importance of Work Index in Mineral Processing

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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Table of Bond Work Index by Minerals

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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