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 …

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 and blast furnace slag mixture Bond Work Index in different mass propor-tions. He found out that these values are always lower than the Bond Index obtained

DOI: 10.5937/MMEB1704021T Corpus ID: 55235386; The Bond work index of limestone and andesite mixtures @article{Todorovi2017TheBW, title={The Bond work index of limestone and andesite mixtures}, author={Dejan Todorovi{'c} and Zoran Bartulovi{'c} and Vladimir Jovanovi{'c} and Branislav Ivo{vs}evi{'c}}, journal={Mining and Metallurgy …

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 ...

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 …

3. An operating work index (WiO): A measurement of a specific energy consumption and size reduction in an operating plant. 4. A generic work index that represents an intrinsic ore breakage characteristic that is independent of the apparatus used to determine it (Wi). This, more nebulous work index, is mostly of interest to

If 20% of pulverized limestone with a work index of 12.74 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? ...

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 the different researchers. The study is focused on comminuting behavior of limestone and …

Deniz (2004) [22], presented the relationship between Bond's grindability and breakage parameters of grinding kinetic. He conducted grindability test on 6 limestone samples taken from different regions of Turkey and found the following relation between breakage parameter (S i, a T, β and γ) with correlation coefficients of 0.96, 0.92, 0.90 …

The grindability of an ore in the process of mineral dressing can be determined by use of the Bond work index ... Experiments with samples of copper ore, limestone and andesite at several different mesh sizes of test sieves have shown that the above assumptions were correct (k'/k= 1.005 to 1.012; P/P' = 1.007 to 1.014). The work …

Limestone is a sedimentary rock primarily composed of calcium carbonate (CaCO3) in the form of mineral calcite or aragonite.It 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 …

Bond's work index is very useful in blasting and communition process, but its determination is very lengthy and cumbersome process ... He conducted grindability test on 6 limestone samples taken from different regions of Turkey and found the following relation between breakage parameter (S i, a T, β and γ) with correlation coefficients of 0. ...

The standard methods to measure resistance to grinding are energy–size relationships, such as the Bond work index. ... Limestone's low resistance to grinding might be linked to its low composition of silicate, iron and aluminium compounds, which are known to contribute to material hardness. Moreover, size reduction of fine particles is an ...

'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. ... Limestone. 16. Gold Ores. The kilowatt-hours per tone (kWh/t) will work out your work index. The number of kittowatts consumed in a hour divided by the tonnes of ...

Keywords: Bond work index, grinding, circulating charge, composite samples * Institute for Technology of Nuclear and other Mineral Raw Materials, 11000 Belgrade, Serbia, [email protected]

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 3.1. 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.

The S.G. of limestone was 2.66 and the Bond work index 12.74 kWh/t. Estimate: The HP required to crush (1 kW = 1.34 HP). 5.10. The feed size to a gyratory crusher is 2.54 cm and nearly uniform. The product analysis is given in column (2) in the table below. The power required to crush the feed was 500 kW.

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 = 0.84) was obtained with D 90 size parameter. In terms of grinding energy calculations, Bond Work Index (BWI) was taken into …

Bond work index measured with the traditional Bond test [kW h/t] W i,B,Karra. Bond work index calculated with the Karra algorithm [kW h/t] W i,B,H. Bond work index computed from the Hardgrove measurements result [kW h/t] c LP * relative limestone content in the product of the Bond measurements first grinding step [-] c LF **