EF5BM=[ P80+ ×P80] ( 3 ) The EF4 formula requires both the rod mill and ball mill work index (rod mill Wi is used to calculate the optimal feed size) and because this is a “singlestage ball mill” calculation, the F80 is actually the rod mill feed size (10,000 µm) from Table 1 and the P80 is the ball mill circuit product. The EF5 factor only applies below 75 µm to ball

Get PriceThe rod mill work index laboratory test is conducted by grinding an ore sample prepared to 80% passing mm (½ inch, the original test being developed in imperial units) to a product size of approximately 1 mm (in the original and still the standard, 14 mesh; see Chapter 4 for definition of mesh), thus determining the rod mill work index (WiR or RWi).

Get PriceJan 01, 2013· To calculate Bond rodmill work indices, the four samples were screened and the particle size distributions plotted in Fig. plot was used to find F 80 of the samples for calculations. Fig. 3, Fig. 4 show the grinding kinetics of Pb, Cu, Fe, and Mn ores in the Bond rodmill in different testsieves. The slopes of all lines in the figures are equal to the k value of Eq.

Get PriceHere is a list presented in table form of Rod Mill Work Index as tested/presented by SME handbook of mineral processing, Weiss Editor, 1985.

Get PriceBond rod mill work index The Bond rod mill work index (RWi) is used by some practitioners to determine specific energy based on empirical methods. JKTech conducts a regular program of testing for each of the laboratories licensed to conduct Drop Weight tests using a standard rock sample. The results of this testing for the Drop

Get Pricethe work index depending on the grind size. In this way, work index values are usually obtained for some specific grind size that characterizes the grinding operation to design or under evaluation. This study was carried out in a standard bond ball mill 305 mm x 305 mm size

Get PriceCommentary on the apparatus of the Bond rod mill Work Index by Alex Doll December, 2015 The Bond “Third Theory” of comminution was originally divided into three size classes reflecting the varieties of comminution equipment common during the time period when Bond (and his collaborators) were gathering the information to calibrate comminution models. The middle …

Get PriceJan 01, 2013· The Bond rodmill work index is used in conjunction with Bond’s third theory of comminution to merely calculate net energy requirements for sizing rodmills. This test was originally developed in the mid 1930s by Bond. Though, it was altered in succeeding years, it has essentially remained unchanged since 1961.

Get PriceAn global operational work index, Wiog, is defined for a conventional grinding plant consisting of a rod mill followed by three inverse hydrocycloneball mill grinding circuits and its value is ...

Get PriceThe Work Index is used when determining the size of the mill and grinding power required to produce the required ore throughput in a ball mill. 2. Procedure Bond Ball Mill Grindability The sample was crushed to passing 6 mesh (), from this a 700 cc volume was measured and weighed to be used as feed for the Bond Mill.

Get PriceThe model was validated for four materials, showing that it can predict the Bond rod mill work index with deviations below 10%. Requiring only –3kg of sample, the procedure is demonstrated to ...

Get PriceThe Bond ball mill work index is one of the most commonly used grindability tests in mining, and is often referred to as the Bond work index.. The test is a ''lockedcycle'' test where ground product is removed from test cycles and replaced by fresh feed.

Get PriceIndices. (It is also the Bond ‘design’ Work Index for this circuit.) To avoid the introduction of any designinefficiency factors in the Bond reference standard circuit, assume 8 foot ( m) diameter, overflow mills, and use a rod mill feed size (F80) of 16,000 m and a rod mill µ product size of 1,000 m .

Get PriceThe grinding jar for the Bond Index Rod Mill is 12″ x 24″ in size and has a waveshaped design. At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill. The Rod Mill Work Index (RWI) is used for particle size determination in a size range from 25 mm down to mm whereas Ball Mill Work ...

Get PriceAppendix B2 Bond Work Index Test Procedure for Determination of the Bond Rod Mill Work Index. Pages . 683685. Select Appendix B3 Rod Mill Power at Mill Pinionshaft (Horsepower) Book chapter Full text access. Appendix B3 Rod Mill Power at Mill Pinionshaft (Horsepower) Page . 686.

Get PriceNo 1 rod mill/ball mill circuit was operating very efﬁ ciently when comparing the combined operating work indices for both mills with the rod mill and ball mill laboratory work indices. Note, in Figure. 1, that the rod mill product slope is less than due to an extra amount of …

Get PriceAn error analysis of the Bond rod mill work index is performed. A first source of error is the representativity of the sample used for the test, estim…

Get PriceIndex (BWi), the Rod Mill Work Index (RWi), the Crusher Work Index (CWi) and the Abrasion Index (Ai). Over the years, it has been determined that Efficiency Factors (EF1 to EF9) should be applied to Equation 1 to drive the corrected power requirement (Rowland, 1982).

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Get PriceThe Titan Bond Work Index Rod Mill is onepiece cast construction with integral wave liners of a form described by Bond. This mill is used to perform the necessary metallurgical testing to determine the grinding characteristics of ores and power requirements for operating productionsize rod mills.

Get PriceBond Rod Mill Work Index, RWi, kWh/t Table 1. Example of AG/SAG Ball Mill Circuit Wio Calculations [1] [2] ABstrAct Optimum use of power in grinding, both in terms of grinding efficiency and use of installed capital, can have a large effect on profitability. Mill operators have long used operating work indices to evaluate grinding circuit

Get PriceJul 30, 2020· Measuring ore grindability in rod mills. The Bond Rod Mill Work Index is a measure of the resistance of the material to grinding in a rod mill. It can be used to determine the grinding power required for a given throughput of material under rod mill grinding conditions. It is a ''locked cycle'' test conducted in closed circuit with a laboratory ...

Get PriceIn Mineral Processing Design and Operations (Second Edition), 2016. Rod Mill Charge. Rod mill charges usually occupy about 45% of the internal volume of the mill. A closely packed charge of single sized rods will have a porosity of %. With a mixed charge of small and large diameter rods, the porosity of a static load could be reduced even further.

Get PriceThis test determines the Bond Rod Mill Work Index, which can be used with Bond’s Third Theory of Comminution to calculate net power requirements of sizing rod mills. The test is a closedcircuit, dry grindability test, is run in a standard rod mill, and can be performed at sizes ranging from mm to …

Get Pricework index for plant griding mills. Use this online formula to calculate a ball mill, rod mill or sag mill operating work index based on fred bonds work you can estimate the energy used into your grinding circuit this is the most accurate and informative method, but much of the data necessary for its application is not yet available a total apparent volumetric charge filling including balls ...

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