### MODELING THE SPECIFIC GRINDING ENERGY AND BALL-MILL

Introduction of the Bond work index w i to the above equations Hard ore 18.0 1.961 Medium ore 12.0 1.290 Soft ore 6.5 0.671 Coefficients k Bond work index (w i) kWh/short ton Denver ore-hardness Table. Relationship between the Bond work index (w i) and the ore hardness designated by Denver

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Bond F. C. "Crushing Tests by Pressure and Impact" Trans AIME Vol 169 1947 pp 58-66. Bond Rod Mill Grindability Test. The test determines the Bond Rod Mill Work Index which is used with Bond s Third Theory of Comminution to calculate net power requirements when sizing ball mills . Various correction factors may have to be applied.

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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 µm. Adjustment of grinding parameters

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Mill diameter Mineral density Work Index. Bond estimated the amount of wear in terms of kilograms per kWh based on the abrasion index A i.e. Wet Ball Mill = kg kWh = 0.16(A i-0.015) 0.33 Dry Ball Mill = kg / kWh = 0.023A i 0.5 Replacement Ball Size

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A mill is a device that breaks solid materials into smaller pieces by grinding crushing or cutting. Such comminution is an important unit operation in many processes.There are many different types of mills and many types of materials processed in them. Historically mills were powered by hand (e.g. via a hand crank) working animal (e.g. horse mill) wind or water ().

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Bond Standard Circuit Work Index Assume the rod mill Work Index of 9.5 applies from the actual rod mill feed sizeof 19 300 mµ (although some of this work might ideally be done by crushers to achieve a rod mill F80 of 16 000 m) to a rod µ mill (circuit) product size of 1 000 µm. W1 = 9.5 x (10 / √ 1 000)(10 / √ 19 300) = 2.32 kWh/t

Get Price### Bond Ball Mill Index Test JKTech

A Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mill(s) and the associated grinding circuit(s). Sample Requirements A minimum of 8 kg of material crushed to nominally minus 10 mm is preferred. JKTech would stage crush the sample to minus 3.35 mm as required for the Bond Ball Mill Work Index test feed.

Get Price### QUICK METHOD FOR BOND WORK INDEXAPPROXIMATE

grinding cycles. The Bond Work Index is calculated using the formula 𝑖=1 1 44 5 𝑃𝑐 0 23𝐺 82(10 √𝑃80 −10 √𝐹80) (1) where W iBond work index (kWh/t) P ctest sieve mesh size (µm) Gweight of the test sieve fresh undersize per mill revolution (g/rev) F 80sieve mesh size passing 80 of the feed before

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bond index in vertical roller mill power calculations. Feeding granularity ㎜ Production capacity t/h. Applicable materials granite basalt iron ore quartz sand river pebbles coal gangue construction waste etc.

Get Price### Bond Efficiency-GMG-ICE-v1-r04 Determining the

The Bond Work Index (Wi) is the specific energy associated with a stan- dard amount of size reduction from a very large F80 (80 passing circuit feed) of approximately infinity to a P80 of 100 µm. 6.OTHER USEFUL DOCUMENTS

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Standard Bond Ball Mill Grindability Test Method. Here is the old Allis-Chalmers Bond Work Index Grindability Test Procedure The standard feed is prepared by stage crushing to all passing a 6 mesh sieve but finer feed can be used when necessary It is screen analyzed and packed by shaking in a 1000-cc graduated cylinder and the weight of 700 cc is placed in the mill and ground dry at 250 per

Get Price### Bond Tests Mining SGS

Bond F. C. "Crushing Tests by Pressure and Impact" Trans AIME Vol 169 1947 pp 58-66. Bond Rod Mill Grindability Test. The test determines the Bond Rod Mill Work Index which is used with Bond s Third Theory of Comminution to calculate net power requirements when sizing ball mills . Various correction factors may have to be applied.

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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 density desired mill tonnage capacity DTPH operating solids or pulp density feed size as F80 and maximum chunk size product size as P80 and maximum and finally the type of circuit open/closed

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Ball Mill Work Index Calculation Xls Barite Metallurgy Mill. 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 mill grinding wikipedia 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

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A Bond Ball Mill Index Test (BBMWI) is a standard test for determining the Ball Mill Work Index of a sample of ore. The BBMWI 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 ball mill grinding consitions.

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bond index in vertical roller mill power calculations. Feeding granularity ㎜ Production capacity t/h. Applicable materials granite basalt iron ore quartz sand river pebbles coal gangue construction waste etc.

Get Price### USING THE SMC TEST® TO PREDICT COMMINUTION CIRCUIT

= fine ore work index (kWh/tonne) P. 1 = closing screen size in microns . Gbp = net grams of screen undersize per mill revolution . p. 80 = 80 passing size of the product in microns . f 80 = 80 passing size of the feed in microns . Note that the Bond ball work index test

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Ball Mill Design/Power Calculation. 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 density desired mill tonnage capacity DTPH operating solids or pulp density feed size as F80 and maximum chunk size product size as P80 and maximum and

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Calculation Of Capacity Of Cement Ball Mill. Calculate and Select Ball Mill Ball Size for Optimum Grinding Based on his work this formula can be derived for ball diameter sizing and selection Dm 6 log dk d05 where D m the diameter of the singlesized balls in mmd the diameter of the largest chunks of ore in the mill feed in mm

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Ball mill efficiency calculations OneMine Mining and Minerals TITLE Using The Bond Work Index To Measure Operating Comminution Efficiency. calculations for efficiency of cement ball mill. Crusher Machine For Sale. ball mill efficiency calculations is manufactured fromShanghai It is the main mineral processing cement ball mill Get Price

Get Price### QUICK METHOD FOR BOND WORK INDEXAPPROXIMATE

grinding cycles. The Bond Work Index is calculated using the formula 𝑖=1 1 44 5 𝑃𝑐 0 23𝐺 82(10 √𝑃80 −10 √𝐹80) (1) where W iBond work index (kWh/t) P ctest sieve mesh size (µm) Gweight of the test sieve fresh undersize per mill revolution (g/rev) F 80sieve mesh size passing 80 of the feed before

Get Price### CORRELATION BETWEEN BOND WORK INDEX AND

The Bond s standard ball mill is used to determine the work index value of differ ent samples. The Bond work index is defined as the kilowatt-hours per short ton required to break from infinite size to a product size of 80 passing 100 µm. If the breakage characteristics of a material remain constant over all size ranges the calcul ated work

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cemtechThe Cement Grinding Office- ball mill efficiency formula Different Ways to Get an Efficient Grinding Plant This presentation The presentation describes two well-known ball mill power formulas These formulas areA New Approach to the Calculation of Work Index and the Potential size to 100 microns The calculation is based on the size

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bond index in vertical roller mill power calculations. Feeding granularity ㎜ Production capacity t/h. Applicable materials granite basalt iron ore quartz sand river pebbles coal gangue construction waste etc.

Get Price### Ball Mill Design/Power Calculation

Dec 12 2016 · Ball Mill Power Calculation Example 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

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