Relation of Bond rod mill work index and crushing work index. Similar to the ball mill work index, the rod mill work index is a tumbling test that includes both attrition and abrasion breakage mechanisms. Unlike the ball mill work index, the size of the feed to a rod mill test 10 mm12 mm is closer to the size of the crushing test.
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 2.1 mm whereas Ball Mill Work Index BWI is used for the range from 2.1 mm down to 100 m.
View Moremill. As such, primary ball mills should be designed with the rod mill work index, and singlestage ball mills should be with both the rod mill and ball mill indices. This is because it is common to observe a difference sometimes significant between the rod mill and ball mill index values for a given ore type McKen, Verret, Williams, 2006. On
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View MoreRelation of Bond rod mill work index and crushing work index. Similar to the ball mill work index, the rod mill work index is a tumbling test that includes both attrition and abrasion breakage mechanisms. Unlike the ball mill work index, the size of the feed to a rod mill test 10 mm12 mm is closer to the size of the crushing test.
View MoreThe mill product can either be finished size ready for processing, or an intermediate size ready for final grinding in a rod mill, ball mill or pebble mill. AGSAG mills can accomplish the same size reduction work as two or three stages of crushing and screening, a rod mill, and some or all of the work of a ball mill.
View MoreJKTech Laboratory Services Bond Rod Mill Index Test BRMWI A Bond Rod Mill Index Test BRMWI is a standard test for determining the Rod Mill Work Index of a sample of ore. The BRMWI is a measure of the resistance of the material to crushing and grinding. It can be used to determine
View MoreNo 1 rod millball mill circuit was operating very ef 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 0.5 due to an extra amount of
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View MoreThe Bond rod mill work index is not as common as the Bond ball mill work index, and there are two different variations on the mill models expect a mill with a wave liner, and is not compatible with mills using smooth liners.
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View MoreGenerally, Bond work index is a common method for selecting comminution equipment as well as estimation of grinding efficiency and calculating required power. In the current research, a simple, fast and accurate procedure is introduced to find the rodmill work index based on the conventional Bond work
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View MoreThe rod mill work index laboratory test is conducted by grinding an ore sample prepared to 80 passing 12.7 mm 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
View MoreTo 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.
View MoreBond Rod Mill Work Index, RWi, kWht 18.1 Table 1. Example of AGSAG 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
View Morestandard Bond crushing, and rod mill work indices, abrasion indices and by Dawson for Bond Ball Mill Work Index tests using crushed feed, and Standard Autogenous Grinding Design SAGDesign Tests, patented by Outokumpu. See reference 8 below. The comparison of these results gives context to how the various measurements relate to each
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View Morestandardized laboratory testwork. The full suite of Bond comminution tests provide the Ball Mill Work Index 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
View MoreBond Rod Mill Grindability Test. The test determines the Bond Rod Mill Work Index which is used with Bonds Third Theory of Comminution to calculate net power requirements when sizing ball mills. Various correction factors may have to be applied. The test is a closedcircuit dry grindability test performed in a standard rod mill.
View MoreBond Standard Circuit Work Index Assume the rod mill Work Index of 9.5 applies from the actual rod mill feed sizeof 19,300 m although some of this work might ideally be done by crushers to achieve a rod mill F80 of 16,000 m to a rod mill circuit product size of 1,000 m. W1 9.5 x 10 1,000 10 19,300 2.32 kWht
View MoreHow a Grist Mill Worked Water flowed into the buckets on the waterwheel and made it turn. Gears and rods connected the waterwheel to the grindstones which turned and ground the grain into flour. The miller ran the grist mill and had to know how to grind the grain properly and fix all the machinery.
View MoreBond Rod Mill Grindability Test. Grinding Solutions can carry out Bond Rod Mill Work Index tests to determine the energy requirements for milling ore in a rod mill. The test requires a minimum of 20kg of 12.5mm material. Closing screen sizes typically range from 4.75mm to 212m. Abrasion Index Test
View MoreA Bond rod mill work index is to be determined in an apparatus with a wave liner. The author is aware of four laboratories that offer a rod mill work index test where the lining of the mill is either smooth, or smooth with a small number of primitive lifters that do not constitute a wave liner one of
View Morefinishing mills, which will roll the steel in tandem with one another. The workhorse roughing mill has 135 wide rolls for rolling broadside as the first roughing mill is commonly called to make a slab wider. A 5,000 hp motor drives 42diameter workrolls through 281 gears to reduce the slabs thickness by
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