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Ball Mills vs Rod Mills. Previous Next. When the mill is rotated without feed or with very fine feed, the rods are in parallel alignment and in contact with one another for their full length. New feed entering at one end of the mill causes the rod charge to spread at that end. How to use Bond Work Index to Measure Operating Comminution
determination of the work index for ball and rod mills in 1952 and modified it in 1961. The standard Bond ball mill grindability test is a closed circuit dry grinding test with a 250 circulating load. The standard procedural outline of the test is stated in Bond 1961. The work index for a ball mill, Wi, is then calculated from the following
83 Centrifugal force outward Fc mpamp 2 Dm 2 8.1 amp is the angular velocity, mp is the mass of any particle media or charge in the mill and Dm is the diameter of the mill inside the liners. Gravitational force Fg mpg 8.2 The particle will remain against the wall if these two forces are in balance ie.
W is the work index measured in a laboratory ball mill kilowatthours per metric or short ton P 80 is the mill circuit product size in micrometers F 80 is the mill circuit feed size in micrometers. Rod mill. A rotating drum causes friction and attrition between steel rods and ore particles.
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 the grinding power required for a given throughput of material under rod mill grinding
Bond 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
MORGAN ROD REDUCINGSIZING MILL SETTING THE STANDARD IN ROD ROLLING FOR UNSURPASSED PRODUCTIVITY, TOLERANCES AND MECHANICAL PROPERTIES A Morgan Rolling Technology
Rod mills operate at lower speed than ball mills since the rods are rolled and not cascaded. For an equivalent grind, a rod mill uses less steel than a ball mill because of the lower speed and better contact between the media and ore. The rod charge must be maintained in good working condition, and broken and worn rods must be removed.
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 lt12 ore samples in a Ball Mill using a standard ball charge. Below describes in general terms the Bond Work Index Procedure used by a Professional Metallurgical Testing Laboratory. If you
Bond 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.
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using Bond rod mill work index RMWI, and Bond ball mill work index BMWI. However, the author has developed a relationship between the Bond third theory SE values and the AGSAG SE values to enable the additional power required for AGSAG milling to be determined.
INSTRUCTION MANUAL WELLS INDEX MILL IV. ADJUSTMENTS A. PROPER GIB ADJUSTMENT PROCEDURE MUST BE DONE AFTER 40HOURS ON NEW MILLS Each 700 and 800 series of mills have three gibs. One at front dovetail of table one on left dove tail of saddle one on left dovetail of knee. Each gib is supplied with two lock or adjustment screws.
Millorcircuitperformance,particularlyontheWrtwatersrand,isoftenindicatedbytheindex kilowatturs pertonneofminus 7511material producedkWM minus75 J6fI orO7539Thepaper shows that a standard kWM minus11indexSEcanbeobtained from the standard Bond grindability test which prOllides
Bond 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
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 Equation 1 to drive the corrected power requirement Rowland, 1982.
Bond Rod Mill Index Test. 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 39locked cycle39 test conducted in closed
The 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 2.1 mm whereas Ball Mill Work
2 MODELLING THE SPECIFIC GRINDING ENERGY AND BALLMILL SCALEUP Ballmill scale up Bonds LawData zBond work index w i zFeed D f and product d size both 80 cumulative passing Result The specific grinding energy w Mill power draw P wT, where T the mill capacity Mill dimensions from Tables or charts
Generally, 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