Calculate a Mill's Operating Work Index
Use this online formula to calculate a Ball Mill, Rod Mill or SAG Mill Operating Work Index Based on Fred Bond’s 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 and excess slurry on top of Rod mill work index is used in the Bond/Barratt specific energy consumption model The work index is used to calculate the energy requirement to grind rocks in the medium size range, from 10 mm 20 mm down to about 2 mmTestwork: Bond rod mill work index Rod mills are very similar to ball mills, except they use long rods for grinding media The rods grind the ore by tumbling within the the mill, similar to the grinding balls in a ball mill To prevent the conditions leading to rod charge tangling, the length to diameter ratio is maintained at 14 to 16 Rod mills accept feed up to about 50 mm (2 in) and produce a product in the size range of Rod Mills, How Do They Work? Mine 1145×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 F80is actually the rod mill feed size (10,000C O N S U L T I N G L T D TECHNICAL MEMORANDUMThe rod mill work index laboratory test is conducted by grinding an ore sample prepared to 80% passing 127 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)Bond Work Index an overview ScienceDirect Topics
Ball Mill Design/Power Calculation
A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work index of 15 and a size distribution of 80% passing ¼ inch (6350 microns) The required product sizeformula work inde rod mill web mit edu Appendix A is a detailed time estimate of a rod support Additional useful data tables are given in Appendix B OVLCZ PZZZL eaud as!A Manual Vertical Mill Work table Workpi Saddle TIME ESTIMATION TABLES 2 hp spindle with digital readout $15K 3axis (5 degrees of freedom) Time [min ] 45 90 (Times are in min ) (cont ) n t [1b ] Setup machine (includes formula work inde rod mill vwautomatiquebe The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific Ball Mill Design/Power CalculationRod Mill Batch Process The mill dimensions, (D × L), are 0204 × 03 m and it is loaded with 855 kg steel rods 14 to 20 mm diameter The mill rotates on rolls and its frequency is set to 70 RPM corresponding to 85% of the critical frequency The mill power is = 225 Watts, calculated by (6) Fi PA New Approach to the Calculation of Work Index and the Rod mill power is dependent on mill capacity and work index Mill power increases with: Increasing rod charge; Increasing mill speed; Increasing mill length Rowland and Kjos (1980) provided an expression to quantify power draw at the pinion shaft per unit mass of rods: P↓M / M↓R = 1752 D↑033 (63 – 54J↓R) Φ↓C kW/t D = mill inside diameter (meters) J AMIT 135: Lesson 8 Rod Mills – Mining Mill Operator Training
Bond Work Index an overview ScienceDirect Topics
The rod mill work index laboratory test is conducted by grinding an ore sample prepared to 80% passing 127 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 (Wi R or RWi)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 125mm material Closing screen sizes typically range from 475mm to 212µm Abrasion Index Test The Abrasion Index is a recognised procedure to quantify abrasiveness and approximate wear that can be expected on media and Bond Work Index Tests Grinding Solutions LtdNo 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 05 due to an extra amount of nes present being fi fi ner than 650 μm These fi nes A Method of C alculating Autogenous/ SemiAutogenous 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 particlesMill (grinding) WikipediaIndices (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 (244 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 Also note µ that in order for no GMSG GUIDELINE: DETERMINING THE BOND EFFICIENCY OF
Testwork: Bond abrasion index
It is conventionally used to estimate the liner and media wear rate in rod mills, ball mills and crushers This is a batch test and returns a result in units of grams (the amount of metal that wears off the test coupon) Sample Requirements The minimum sample consists of 2 kg of material in the 19 mm by +135 mm size fraction Sample finer than 135 mm cannot be used and should be excluded Figure 82 Media motion in the tumbling mill 81 Grinding 811 Grinding action Industrial grinding machines used in the mineral processing industries are mostly of the tumbling mill type These mills exist in a variety of types rod, ball, pebble autogenous and semiautogenous The grinding action is induced by relative motion between the particles of media the rods, balls or pebbles TECHNICAL NOTES 8 GRINDING R P KingRod Mill Batch Process The mill dimensions, (D × L), are 0204 × 03 m and it is loaded with 855 kg steel rods 14 to 20 mm diameter The mill rotates on rolls and its frequency is set to 70 RPM corresponding to 85% of the critical frequency The mill power is = 225 Watts, calculated by (6) Fi PA New Approach to the Calculation of Work Index and the Bond quantified the rod mill power draw as a function of the Work Index, capacity, and a series of correction factors: PM = Wmtest,i FT Q FT = F1 F2 F3 F4 F5 F6 Rod Mill Draft Power CorrectionsAMIT 135: Lesson 8 Rod Mills – Mining Mill Operator TrainingThe 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 millsBond Work Index Rod Mill Titan Process Equipment Ltd
rod mill work index classification
The rod mill feeds a wet ball mill at a feed size of 10 mm (1000 μm) and produces a product with 80% passing a 150 μm screen The rod mill is in an open grinding circuit Determine: 1 the shaft power of the rod mill, 2 the size of the industrial mill Data: Laboratory Standard Bond Test: Rod Mill: Grindability index at 10 mesh = 135 kWh/t 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 particlesMill (grinding) Wikipediastandard 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 other and how they can be used to obtain an accurate Comparison of Ore Hardness Measurements for Grinding Mill Tumbling mills, eg AG, SAG, rod and ball mills Conventional reciprocating crushers, eg jaw, gyratory and cone HPGRs Tumbling mills are described using 2 indices: M ia and M ib Crushers have one index: M ic HPGRs have one index: M ih For tumbling mills the 2 indices relate to “coarse” and “fine” ore properties plus an efficiency factor which represents the influence of a pebble USING THE SMC TEST® TO PREDICT COMMINUTION CIRCUIT Austin’s formula gives slightly higher values than Morrell’s for mills that have length equal to about twice the diameter 814 Power drawn by rod mills The power drawn by a rod mill is given by P 0331752D (63 54Vp)3ckW hr/tonne of rods charged (824) where Vp= fraction of TECHNICAL NOTES 8 GRINDING R P King
FM 306: SIZE REDUCTION AND SIEVING
Bonds law is often written in terms of the work index (Wi) as, Where the work index is defined as the energy required per unit mass in kWh/ton to reduce an infinitely large particles to D80 = 100 μm In the above equation, unit of D80 is in mm, of ‘W’ is kWh and of ‘m’ is in ton Work index for common materials is Material Wi (kWh/ton)
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