We value your feedback! Please complete the form below so that we can tailor our services to your specific needs.
The self-grinding work index is an extension of the concept of Bond work index. It generally refers to the work index calculated by using Bond's fracture theory on the principle of ore crushing energy consumption according to the W, F, and P data of a small or semi-industrial or industrial self-grinding test. In this kind of test, McPherson small self-grinding closed-circuit …
WhatsApp: +86 18221755073
The Bond Crushing Work Index (CWI) is then calculated from the formula developed by F.C. Bond CWI = [2.59*K*E b /d/sg] kWh/t (5) Where: E b ... rock breaks. The impact crushing strength in foot-pounds per inch of rock thickness is designated as C, …
WhatsApp: +86 18221755073
When Erf/Erp is greater than 1.29, the work index increases as the product size decreases, and when Erf/Erp is less than 1.29 the work index decreases. Eq. (8) suggests that a standard work index Wi100, or the work index at 80% passing 100 microns calculated from the exposure ratios, can be found from the following Eq. (9):
WhatsApp: +86 18221755073
The Bond' Crushing Work Index is common to calculate the power needed to crush rocks from a given F80 size to a resulted P80 product size. Bond's impact method comes from a double mirrored pendulum impact …
WhatsApp: +86 18221755073
If a strong correlation between impact strength and the crushability of rock can be found, engineers working in crushing plant can easily predict rock crushability from the impact strength test. The main objective of this research is to investigate the possibility of estimating the crushability of rocks from the impact strength test.
WhatsApp: +86 18221755073
Based on a large number of tests, Bond introduced a working index or comminution parameter that represents the resistance of the material to crushing and grinding. Characterization of rocks for selection of crusher can be done in different ways, and the most commonly used is Bond work index (Tavares and Carvalho 2007).
WhatsApp: +86 18221755073
Mathematical equations were developed to predict Bond's work index based on rock properties using regression analysis, which resulted a very good correlation co-efficient values. ... The crushing ...
WhatsApp: +86 18221755073
To determine the Bond's work index, the samples were prepared by crushing large lumps of basalt, slate and granite in a dodge type jaw crusher. ... In this study an attempt is made to predict the Bond's work index using simple rock properties such as density, Protodyakonov's strength index and rebound hardness number. These properties can be ...
WhatsApp: +86 18221755073
Unconfined Compressive Strength (UCS) is a commonly used rockmass strength measurement used by rock mechanics practitioners. This paper examines potential relationships between …
WhatsApp: +86 18221755073
Also, values of crushing work index (CWi) increased inversely with the A*b breakage index, as commonly observed (Napier-Munn et al., 1996; Tavares and Silveira, 2008). In order to demonstrate the ...
WhatsApp: +86 18221755073
A number of methods have been used to characterize rocks for crusher selection. Perhaps the most traditional is the one proposed by F.C. Bond over 60 years ago (Bond, 1947, Bergstrom, 1985), which is still used today for characterizing material crushability in the minerals industry.The Bond crushing work index is a measure of material strength and is determined …
WhatsApp: +86 18221755073
A systematic investigation was carried out to predict Bond's work index using simple field measurable properties of rocks. Tests were conducted on Basalt, Slate and …
WhatsApp: +86 18221755073
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 is used for industrial comminution plants designing. ... This result suggests that, when performing correlation studies among ore grindability and rock mechanics parameters ...
WhatsApp: +86 18221755073
The work index equation for a ball mill test was generated by Fred Bond to empirically predict the operating work index of an industrial ball mill (8 ft dia by 8 ft effective grinding length ...
WhatsApp: +86 18221755073
The commonly used grindability tests included in the database are the Bond work indices for ball milling, rod milling and crushing; the drop weight test results A, b, A×b, DWi, Mia, Mic, Mih and ...
WhatsApp: +86 18221755073
Mathematical equations were developed to predict Bond's work index based on rock properties using regression analysis, which resulted a very good correlation co-efficient values. ... (1995) studied the impact of blasting on crushing and grinding and emphasized on development of micro fracture during the blasting to reduce grinding cost. They ...
WhatsApp: +86 18221755073
The Bond low-energy impact crushing work index (more informally, the Bond crushing work index) is not as common as the Bond ball mill work index, and it is a notoriously noisy test. The test is a 'per-specimen' test where individual specimens of prepared rock are hand-picked by the test operator and placed into the apparatus.
WhatsApp: +86 18221755073
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.
WhatsApp: +86 18221755073
Sizing a crusher can be done reliably calculated thanks to the Impact / Crushing Work Index and the testwork research done by Fred …
WhatsApp: +86 18221755073
A geometallurgical approach helps resolve the uncertainty through the identification, characterization, and spatial modelling of geometallurgical predictors for comminution, i.e., rock properties that are intrinsically linked to rock crushing and grinding behaviour (Dunham and Vann, 2007, Walters, 2008, Coward and Dowd, 2015, Jackson and Young, 2016, Dominy et al., 2018, …
WhatsApp: +86 18221755073
'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 …
WhatsApp: +86 18221755073
Hence, the aim of this paper is twofold: 1) it explain show to calculate the comminution exergy for any mineral or rock as a function of the comminuted size, and 2) what should be the reference...
WhatsApp: +86 18221755073
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 911 Metallurgist is a trusted resource for practical insights, …
WhatsApp: +86 18221755073
Heavy-duty crushing applications of hard-to-break, high Work Index rocks do prefer double-toggle jaw crushers as they are heavier in fabrication. A double-toggle jaw crusher outweighs the single-toggle by a factor of 2X and well as costs more in capital for the same duty. To perform its trade-off evaluation, the engineering and design firm will ...
WhatsApp: +86 18221755073
The Pendulum Tester / Bond Impact Crushing Work Index Tester. Working principle Crushing by impact. 76 mm maximum feed size. Test repetition: At least 10, preferably 20 test runs. Adjustable crushing angle; Repeatable crushing …
WhatsApp: +86 18221755073
Work Index values (crushing, rod mill and ball mill). Data from 11 mines located around the world is ... 1952), divided into a low energy crushing work index (Wi C) for coarse rocks (75-50 mm), a rod mill work index (Wi RM) for intermediate sized particles (25-3 mm), and a ball mill work index (Wi BM) for small particles (<3 mm) (Ammtec, 2000 ...
WhatsApp: +86 18221755073
116 Crushing and classification ∝ − 3 i 5/2 i 3 f 5/2 f x x x E giving = − f i 10 10 x x E W i (11.5) where Wi is the Bond Work Index, again in energy per unit mass terms. The index is defined as the energy required to crush from infinite size down …
WhatsApp: +86 18221755073
Using the Bond work index to measure operating comminution efficiency Published: 01 November 1998 Volume 15, pages 32–36, ( 1998 )
WhatsApp: +86 18221755073
Ore hardness can be estimated using commercially available standard techniques such as the SAG Power Index (SPI), Bond Work Index (BWI), and JK Drop Weight (JKDW) tests (Bailey et al., 2009 ...
WhatsApp: +86 18221755073
Most of the models presented so far for crushing have been based on PFC and fracture criteria has rarely been used. Since PFC3D models the rock as a granular medium and based on that assumption, the fracture only occurs through the boundaries of stiff particles, strength of the rock depends on bonding forces between particles (Potyondy and Cundall, 2004).
WhatsApp: +86 18221755073
