Results showed that the blasting process can reduce the Bond work index of fragments as much as 18% and enhances their crushability by 9.5%. Moreover, using different explosives brought about sensible changes in results, so that substituting ANFO with pentolite or emulite decreased the Bond index by 9.2% and 6.7% respectively, and increased the ...

2019-7-22 · Bond Crushability Work Index kWh/t 8.8 to 9.8 Bond Abrasion Index 0.03 to 0.05 Bond Rod Work Index kWh/t 10.0 to 10.2 Bond Ball Work Index kWh/t @ 212µm kWh/t @ 106µm 11.61 to 11.98 13.2 to 13.3 ... • Degree metallisation increases with decreasing coal ...

The Bond''s grindability test (WI) can be used to deter-mine the work index of any type of ore or material. But the process is tedious and long time consumption. The laboratory determination of Hardgrove grindability index (HGI) is less time consuming than that of the selection-for-breakage function. On the other hand, impact strength

2015-9-7 · Bond crushability work index testwork results indicates that the ore can be classified as soft to very soft to crush. Bond abrasion index values (Ai) of 0.1 g, 0.05 g and 0.02 g were obtained for Composites A, C and D respectively, indicating that the material was of low abrasion tendency. Bond crushability work index test results Sample ...

2007-12-1 · The Bond crushability index is given by the median of the distribution (Bergstrom, 1985). It is used to calculate crusher power consumption from Bond''s law of comminution, given by (3) W = 10 Wi 1 P-1 F where F and P are the 80% passing sizes in the feed and product of the crusher (in μm) and W is the specific energy consumption (in kWh/t).

Bond Work Index - an overview | ScienceDirect Topics

2014-2-26 · CRUSHABILITY TESTS French Abrasion • Gives an Abrasion and Crushability Index • Mainly used to estimate hammer wear in the Impactor application Dynamic Fragmentation • Conducted for Impactor application • Measures the friability …

2017-9-1 · For example, substituting ANFO with pentolite increases the crushability index (CI) up to 6.36%. • Blasting operation improves the grindability of rock materials. Results of this study showed that the Bond work index of blasted rocks are averagely 18% lower than the unblasted sample.

2021-8-17 · It is also important to make sure that the laboratory conducting the Bond crushability Work index test is using the standard Bond equipment and calculations. As reported by C. Bailey et al (2009) in their paper what can go wrong in comminution circuit design, a modified design of the machine can generate lower values of CWI for competent rocks.

2016-2-17 · It is well known that particle breakage plays a critical role in the mechanical behavior of granular materials and has been a topic subject to intensive studies. This paper presents a three dimensional fracture model in the context of combined finite-discrete element method (FDEM) to simulate the breakage of irregular shaped granular materials, e.g., sands, gravels, and rockfills. In this ...

2020-6-11 · The Bond crushability index is given by the median of the distribution ( Bergstrom, 1985 ). It is used to calculate crusher power consumption from Bond''s law of comminution, given by ( Bond, 1952 ) (3) W = 10 Wi 1 P - 1 F where F and P are the 80% passing sizes in the feed and product of the crusher (in μm) and W is the specific energy ...

2017-7-9 · increases with the hardness of material. Among all the limestone samples, experimentally, it has been concluded that Face-4A needed less energy consumption and high grindability rate than the rest of others. Limestone is mostly used in the Cement Industries for the manufacturing of cement, so it is only the Bond grindability

2014-11-1 · The standard Bond crushability tests showed that the pre-weakening of the phosphate ore sample using the HVEPC with energy consumption of 3 and 5 kWh/t reduced the crushability indices by 7.8% and 10.6%, respectively. It was clear in the microscopic images that the cracks were created at the minerals surfaces.

The Impact Tester is a laboratory test machine, which is suitable to determine the crushability test that was developed by F.C. Bond. The Impact Tester consists of two pendulum-mounted hammers, each weighing approximately 30 lb, and mounted to …

2016-9-29 · decrease in Bond''s work index for grinding or an increase in amount of undersize that bypasses the crushing stages. A greater energy input, i.e. a higher specific charge, at the blasting stage will often be less costly than expending the energy downstream. The grinding improvements will depend primarily on the degree of micro-fracturing achieved

2016-12-29 · The shear strength increases by almost 50% when 25% DE is added as also previously observed by Shiwakoti et al. . ϕ increases by ∼9° from zero to 25% diatomaceous earth. Other workers found an increase by ∼10° (Figure 3b). From 25% to DE content the angle of internal friction in this study increases slightly from ∼28° to ∼32°.

The Bond work index is not solely a material constant but is influenced by the grinding conditions. For example, the finer the grind size desired, the higher is the kWh/t required to grind to that size. Magdalinovic [38] measured the Bond work index of three ore types using different test screen sizes. He produced a correlation between the mass of test screen undersize per revolution, G, and ...

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 …

The traditional impact work index (Wi) proposed by Fred Bond over 60 year ago is still used today in characterizing material crushability. However, more recent measures, …

2012-10-10 · with a decreasing degree of crushability by using 20%, 10% and 0% of the elementary ball removal in the rst three kinds, respectively, and zero crushability (i.e., uncrushable) in the fourth kind. The uncrushable specimens are created by raising the parallel bond strength parameters 100 times and by using a much larger number (about 8000) of

2019-11-11 · strength, hardness, abrasiveness and crushability. For example, the crushing yield stress is >10MPa for quartz sand and <0.2 MPa for carbonate sands. The role of mineralogy in fine-grained soils is more subtle, yet more important. Clay minerals are made of layers of silicates and aluminates, and are known as phyllosilicates.

Crushing and Screening Handbook f MINERALS Minerals in brief Whether you need a single crusher, a multi- stage process or a complete plant, we assist you To be successful in today''s quarry and sand and with the right design for the most cost …

2020-6-9 · The crushability test results showed that the SRR increases gradually from the size I to size III type of feeding for the sandstones whose BTS is relatively low (e.g., Sg–3, Ska–7). However, for the sandstones with higher BTS (e.g., Sk–1, Sg–4, and Sa–5), the variations in the SRR are changeable, which could be attributed to brittle ...

2018-9-15 · Crushability CLASSIFICATION CRUSHABILITY (%) BOND WORK INDEX (KWH/T) LOS ANGELES VALUE UCS (MPa) Very Easy 50+ 0 - 7 27+ 0 - 90 Medium 40 - 50 7 - 10 22 - 27 90 - 150 Difficult 20 - 30 14 - 18 12 - 17 220 - 300 Very Difficult 10 - 20 18 + 5 - 12 300 + Abrasiveness CLASSIFICATION FRENCH ABRASIVENESS ( G/TON) ABRASION INDEX Non Abrasive 0 - 100 0 ...

This data showed a wide range in both crushability (=impact resistance) and grindability. • Impact resistance as measured by the JK parameter A*b ranged from a very hard 25 to a soft 118, although the majority were between 30 and 55. • Grindability as indicated by the bond ball mill work index (BWi) ranged from 10–35 kWh/t, with the

2018-9-15 · CRUSHABILITY CLASSIFICATION CRUSHABILITY (%) BOND WORK INDEX (KWH/T) LOS ANGELES VALUE UCS (MPa) Very Easy 50+ 0 - 7 27+ 0 - 90 Medium 40 - 50 7 - 10 22 - 27 90 - 150 Difficult 20 - 30 14 - 18 12 - 17 220 - 300 Very Difficult 10 - 20 18 + 5 - 12 300 + ABRASIVENESS CLASSIFICATION FRENCH ABRASIVENESS ( G/TON) ABRASION INDEX Non Abrasive 0 - 100 0 ...

2018-3-7 · The current research is focused on the effect of successive impact loading on crushability, compactability, compressibility, and microstructure of micaceous sand containing 30% mica. Significant increase in MDD, fine content, and compression index of micaceous sand was observed with the increase …

2016-8-4 · Testing for Bond mill work index (BMWi), a measure of the ore grindability, and A*b, a measure of the ore crushability, is common in this regard. These destructive tests are expensive and time consuming and, hence, are conducted on a limited number of large volume samples which in most cases are not representative of the entire orebody ...

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