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 = …

The bond work index of granite is expected to be the highest due to the ore being mostly composed of the hard mineral quartz. Bond Work index values of granite presented in literature range from around 14-15. …

Therefore, this measure can be cheaply determined using other rock characteristics. In addition, the value of the BWi determines the energy required for crushing and milling (depends on the BWi type, e.g., crushing work index, Bond ball mill work index, and Bond rod mill work index), and this measure can be used to optimize …

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.

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 …

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 ...

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 ...

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 …

Determination of-bond-work-index-of-lucky-cement-limestone-pakistan - Download as a PDF or view online for free. ... Values of Work index w.r.t number of grind- ing cycles TABLE 3 THE EXPERIMENTED AVERAGE VALUES OF BOND WORK INDEX 6. International Journal of Scientific & Engineering Research, Volume 8, Issue 6, June …

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 …

Section snippets Apparatus and methods. Traditional Bond ball mill (Ø305 × 305 mm) and Hardgrove mill were used for the measurements.The traditional Hardgrove Grindability Index (HGI) was determined by using the following equation: HGI = 13 + 6.93 m P where m P means the mass of product particles finer 75 μm in grams. From this …

Table 3 shows the obtained values of the Bond Work Index for 6 tested limestone samples. The present test results ( Table 3) indicate that the value of the Bond Index ranges be- tween 5.9 and 6.4 ...

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 ...

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 …

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 ...

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 …

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) …

Bond work index determination: ... Limestone 2,131 156 200 3.0650 8.99 ... (Bond, 1952). Figure 3 — Work index values calculated with both mills for different minerals.

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.

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 …

A comparison of the Bond work index Wi obtained by the standard Bond procedure and quick procedure with two, three and four grinding cycles Sample Limestone: andesite 0 : 100 Limestone: andesite 25 : 75 Limestone: andesite 50 : 50 Limestone: andesite 75 : 25 Limestone: andesite 100 : 0 Sieve, µm Wi, kWh/t 74 2 Grinding 3 Grinding 4 Grinding ...

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 …

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.).

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 ...

Therefore, this measure can be cheaply determined using other rock characteristics. In addition, the value of the BWi determines the energy required for …

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 ...

A minette-type oolitic iron deposit in the Peace River district, Alberta, occurs as flat-lying ironstone beds up to 10.6 m thick which contain 32-34 wt. % Fe in situ or 36-38 wt. % Fe after drying ...

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.

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 ...

The work index Wi was defined by F. Bond as the specific energy (kWh/ton) required to reduce a particulate material from infinite grain size to 100 microns.