In this study, a crushability index (CI) was described and the predictability of UCS and BTS from the CI was studied. The sample preparation and testing method are easy in the crushability test. A small amount (500g) of crushed rock is enough for testing. This is an advantage when there are limited rock samples.
can be determined using the data generated by a conventional Bond ball mill work index test (M. ib. is NOT the Bond ball work index). M. ic. and M. ih. values are also provided as a standard output from a SMC Test ® (Morrell, 2009). The general size reduction equation is as follows (Morrell, 2004. b): f x f x 2. 1 i i. 4 2 W M x x. 1 (1) where ...
However, the Bond work index (TEST) so determined has to be corrected for conditions encountered in industry that differ from the above conditions. Bond defined eight correction factors. 1. Correction factor: ... avoiding over crushing by using low energy impact or compression and by closing the circuit with a 3327 μm screen.
• Bond Rod Mill Work Index • Bond Abrasion • Specific Gravity, 2 methods • JK Drop Weight Tests – Data Analyzed by Contract Support Services, Inc. Phillips Enterprises, LLC • Bond Impact Crushing Work Index • Specific Gravity Advanced Terra Testing, Inc. (ATT) • Unconfined Compressive Strength ASTM D 5731
Bond Work Index testing equipment and methods are also provided. The next steps are: (1) to establish standard reference testing ... The Bond Crushing WI Test Equipment and Procedure for Bond Efficiency Determinations (Revised March 26, 2015) B1. The Bond Rod Mill WI Test Equipment and Procedure
An analysis of the results shows a direct relationship between the Bond work index and the Denver work index when the Bond test is defined adequately to the Denver lab mill. Comparison of results ...
Bond Impact Crushing Test (CWi). A traditional test conducted upon a set of rock specimens (typically 10 or 20) sized between 50 to 75 mm with two parallel faces. ... Typically, 10-12 kg at the target crush size. Bond ball mill work …
Repeatable crushing results. Safe two-hand operating buttons. The Bond Crushing Work Index (CWI) describes the competency of the ore at larger particle sizes. It is used for the calculation …
The test determines the Bond Impact Work Index which is used with Bond's Third Theory of Comminution to calculate net power requirements when sizing crushers*. It is also used to determine the required open-side settings (jaw crushers and gyratory crushers) or …
FIGURE 5: BOND ROD MILL WORK INDEX v. UNCONFINED COMPRESSIVE STRENGTH 0 100 200 300 400 UCS (MPa) 5 10 15 20 25 30 35 WiRM (metric) The lack of fit observed relating the crushing Work Index was expected to carry over to the other Bond Work Indices. Figure 5 displays the plot of rod mill Work Index (Wi RM) versus UCS. These
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.
Three Bond work index tests are commonly used in the industry. This essay discusses some observations from SAGMILLING database of published grindability results about relationships, and lack thereof, between the Bond comminution tests. A further comment is made about the Bond abrasion index a…
This Grindability Test or Bond Ball Mill Work Index Procedure is used to determine the Bond Work Index of minus six mesh or finer feed ore samples. These equation application methods are used to process <1/2″ ore …
This study aims to calculate the Bond Work index with steel and ceramic balls and explore the equation for the BWi of mixed grinding media (steel and ceramic balls). ... The impact crushing force on minerals is quite different. When steel ... Umucu Y (2003) The effect of circulating load and test sieve size on the Bond work index based on ...
The selected rock sa mple of -80+19 mm size fraction was subj ected to impact crushing ... The Bond work index (BWI) is a well-known method used when selecting comminution equipment, to evaluate ...
impact of using a testing mill with a 4-inchX8-inch hand hole door in the shell versus a mill with ... Background The crushing and grinding circuit are the most energy intensive process in a mining project. Improvements in predicting the energy required to crush a given material, and therefore the cost of comminution, would help to mitigate ...
The Bond Low-Energy Impact test can be used to determine the Crusher Work index (CWi), also known as the Impact Work Index. The test determines the impact energy at which a …
An impact pendulum that follows strictly Bond's standard for crushability measurement (Bond, 1947, Bergstrom, 1985, Tavares, 2007) has been used, which allows calculating the crushing, or impact, work index.The test consists of dropping two pendulum-mounted hammers simultaneously against individual particles of size ranging from 75 to 50 …
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 …
by calculating an operating work index where the SEC (E), feed size (F80), and product size (P80) are measured, and the work index (Wi) of the operating industrial circuit is then calculated. The operating work index is useful for performing comparisons of energy efficiency that are corrected for different amounts of size reduction. 2.
According to Fred Bond, "the work index is the comminution parameter which expresses the resistance of the material to crushing and grinding" [1][2][3].
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 ...
A new testing procedure for studying crushing phenomena, presently being perfected by Allis-Chalmers, is described for the first time. ... The Bond Impact Work Index method has been an industry standard for the determination of crusher power requirements but was originally developed to ensure, that sufficient power was connected to primary ...
For the ball mill grindability test, the work index is calculated from the following revised equation (in short tons): where: Pi = sieve size tested (microns) Gpb = ball mill grind ability Wi, P & F have the same meanings as in the top equation. Equipment required: Laboratory ball mill, 34.02 cm x 34.02 cm with following ball charge: Agitator ...
The Bond low-energy impact test, also named impact work index or Bond impact crushing work index, can measure the crushing work index (CWI) and describes the …
test work. Bond work indices, obtained from bench-scale or pilot plant crushability and grindability tests are used in the fol lowing Bond equation (Bond, 1960) to determine the energy required to produce the required size reduction (1 ) Where W is the power requirements (kWh/st), Wi is the work index determined from comminution test ing,
The work index can be used to evaluate the influence of various operating variables on crushing efficiency. For an industrial crushing process with a given feed particle …
EFFECT OF CORE DIAMETER ON THE BOND IMPACT CRUSHING WORK INDEX TEST EFFECT OF CORE DIAMETER ON THE BOND IMPACT CRUSHING WORK INDEX TEST. Conference Paper. Full-text available. Sep 2011;
The Bond Work index (BWi) is calculated during the design phase of a mining plant and has a substantial impact on the design expenses related to comminution. Mining commi- ... and streamlined approaches for determining the Bond test. In 1989, Magdalinovic ́ proposed a concise approach for calculating BWi with two grinding cycles [6 ]. ...