The paper by Angove & Dunne (1997) reports a standard deviation in crushing work index tests across laboratories as 4.5. The laboratory CWi value of 27.4 (metric) is almost within 4.5 units of the 22.4 value I calculated, so what you are observing is probably the natural variation in the crushing test
The Work Index represents the total work input necessary in installations of average efficiency. How to Find Work Index From Impact Crushing Tests. Where C represents the impact crushing strength (1) in foot-pounds per inch of thickness and S is the specific gravity, the Work Index is found by Equation 3. Equation 3: Wi = 2.59 C/S
and the Bond Work Index (BW i). The Drop Weight and Bond Work Index parameters are required to model the crushing and grinding circuits. Therefore, the use of the Point Load Index allows sites to characterise their rock properties quickly and easily while still making use of the sophisticated grinding models that are available. The PLI data can
2.4.3.2 Impact crushability. Bond impact crushability work index (CWi) ( Bond, 1963) results reported for iron ores vary from hard iron ore (17.7 kWh/t) to medium hardness iron ore (11.3 kWh/t) and friable iron ore (6.3 kWh/t) ( Table 2.11; Clout et al., 2007 )
Abstract and Figures 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
data of crusher work index - elisajane.it The Crusher Work Index in kWh/ton is a function of the material& 39;s impact strength andis defined by an argillite type of rock which has a work index of 16.5 bond crushingwork index equipment. Gold Data Gold Statistics Goldhub. Jaw Crusher Data And Their Crushing Work Index jaw crusher data and their crushing work index
Mar 17, 2017 · The Bond rod mill work index (Wi RM, or RWi) conducted from a feed size of approximately 10 mm to a product size on the order of 1 mm. The Bond crushing (impact) work index (Wi C, CWi, LEIT or IWi) conducted on specimens of a nominal dimension between 50 mm and 75 mm. The product size is not relevant to this test; it is a determination of the energy to the “first fracture” that …
Jan 01, 2016 · The Points Correspond to Industrial Roll Crusher Data. ... Klymowsky et al. indicated that the Bond work index is not exactly a constant factor for a given ore. Otte reported an increase of W i from 13.9 to 15.6 kWh/t for a copper ore and 9.4–15.6 kWh/t for a gold ore
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 specimen fails and allows approximation of net power requirements for sizing crushers. The open and closed sized settings for given product sizes can also be determined
Jan 01, 2016 To compute the power consumption of gyratory crushers, knowledge of the ore work index and crusher capacity is necessary. In its simplest form, the power consumption is given by (5.5) P = W i Q F 80 − P 80 F 80 100 P 80 where P = power (kW) W i = work index (kWh/t) Q = capacity (t/h) F 80 = size through which 80% of the mineral
different (higher) work index than the crusher (ie the ball mill is less energy efficient than a crusher and has to input more energy to do the same amount of size reduction)
Jan 01, 2016 · Estimation of Work Index for Crushers and Grinding Mills. The standard laboratory procedures for estimating work index can be divided into two categories. The first category involves tests on individual particles of rock and the second category deals with bulk rock material. A number of tests are required to get an idea of the rock strength
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 closed-side settings (cone crushers) for a given product size
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Apr 21, 2021 · Cone crushers are fed with pre-screened material from the primary crusher (usually a jaw crusher or primary gyratory), and the secondary crusher should always, if possible, have a scalped feed. Ideally, the deck on the scalping screen should have a cut point equal to the closed side setting (CSS) of the crusher
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