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Rod mill is a type of grinding mill whose grinding media is steel bar, while ball mill is steel ball. 1. Rod mill are usually applied to grinding the w-sn ore and rare metal in the reselection or magneticore-dressing plant in order to avoid the damage caused by the over crushing. 2. In the two stage grinding process, if it requires grinding the ore from 20-6mm to 1-3mm in the first stage, rod

Get pricepower calculation formula of sag mill 21 Jun 2013 mill charge load calculation Crusher Granite The ball mill ball calculation formula The mill . early stage in a project, to measure and plan SAG mill power . facts by using the SAG Power Index Test and the Bond Work Index power calculation for autogenous work index

Get priceBond Ball Milling apos-project . bond ball mill work index Grinding Mill China. Bond Index Ball Mill PTBBM Prep Tech CN. The Prep Tech Bond Index Ball / Rod Mill is designed to meet the industrial requirements to grind coal, cement and a wide variety of ores related to the Bond Ball Mill and Bond Rod Mill WORK INDEX This index is used to calculate the power.

Get priceSagmilling is home to a collection of both free and subscription-based calculation tools to aid metallurgical process engineers perform comminution calculations. Grinding circuit design tools, including for SAG mill-ball mill circuits, and geometallurgy energy models are available to subscribers.

Get priceKinetic grinding test approach to estimate the ball mill work index 343 The W i parameter is obtained from Bond's ball mill grindability test (Bond, 1961).

Get priceBall Mills are generally used to grind material 1/4 inch and finer, down to the particle size of 20 to 75 microns. To achieve a reasonable efficiency with ball mills, they must be operated in a closed system, with oversize material continuously being recirculated back into the mill to be reduced.

Get price[]### The Effect of Circulating Load and Test Sieve Size on

grindability, on the Bond ball mill grindability (G hg) and work index (W,) are investigated based on four samples of natural amorphous silica. In the experimental studies, the relationships between the Bond work index with circulating load and test sieve size were examined. I INTRODUCTION Currently, silica fume is widely used as a

Get priceThe Bond ball mill grindability test is run in a laboratory until a circulating load of 250% is developed. It provides the Bond Ball Mill Work Index which expresses the resistance of material to

Get price[]### Bond Grinding Circuit Efficiency

Example SAG-Ball Mill Circuit WI Efficiency Calculation SAG-ball circuit F80 = 165,000 um P80 = 125 um W = 14.6 kWh/t Wlo = 14.6 / [( 10 / SQRT 125) (10 / SQRT 165,000)] = 16.8 kWh/t

Get priceThe Bond Ball Mill Grindability Test is a locked-cycle laboratory grinding test, Mill Work Index which expresses the resistance of a material to ball milling, will also use the knowledge from more recent research to add to these explanations and, per revolution for the last three grinds are subsequently used to calculate. Contact Supplier

Get price[]### Kinetic grinding test approach to estimate the ball mill

Kinetic grinding test approach to estimate the ball mill work index 343 estimating the required energy for milling (Levin, 1989) and mill scaling-up (Man, 2002). The W i parameter is obtained from Bond's ball mill grindability test (Bond, 1961). This test is performed according to the

Get priceBond 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 The test is a closedcircuit dry grindability test performed in a standard rod mill

Get priceJun 19, 2015 · The effect of Ball Mill RPM speed going from sub-critical to super-critical helps understand the Ball Mill Working Principles of ball-on-ball VS ball-on-shell grinding. The Motion of the Ball

Get priceKinetic grinding test approach to estimate the ball mill work index Article ( Available) in Physicochemical Problems of Mineral Processing 52(1)342-352 · July 2015 with 159 Reads

Get priceOct 19, 2017 · Bond formula for the grinding balls size calculation October 19, 2017 · Archive · 0 . The enterprises consumers grinding media have a question about right choise the grinding ball size (diameter) for the mill in order to achieve the required grinding quality.

Get priceThe grindability of an ore in the process of mineral dressing can be determined by use of the Bond work index (W i).This index is determined on a laboratory-scale using a Bond ball-mill and by simulating dry grinding in a closed circuit until the 250% circulating load has been obtained.

Get priceBall 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

Get price[]### GMSG GUIDELINE DETERMINING THE BOND

two. Results of Bond ball mill tests conducted with closing screens of 75 µm or finer are to be treated with caution. The Bond Work Index relationship has been noted to apply down to approximately 70 m, and perhaps no finerµ, without making qualifications. Calculations First, calculate the actual Operating Work Index, WloACT-, of the

Get price[]### JK Bond Ball Mill Test JKTech

samples for multiple mills. Each laboratory was supplied duplicate samples prepared by JKTech. This resulted in seventy-five BBMWi results for the same sample, giving an average work index of 15.5 kWh/t. The results presented to JKTech showed a very broad range of results, characterising the 'standard ore' from medium to very hard.

Get priceAug 15, 2012 · ball mill rpm posted in Newbie Questions ok so I know this is a question I should be able to figure out on my own I thought I know of some web sites that had the equation but I must have been wrong any way the jar is 7.75 inchs wide and 10.5 inchs long and I`m using 50 cal round musket balls for media (it will be half full of media) so what rpm should I run it at Thanks so much

Get priceA Method of C alculating Autogenous Semi. rod mill work index has not been de ned as yet The ball mill work index is con rmed at 16 kWht The operating work index though is in the range of 21 kWht to 25 kWht showing high inefciency This raises the point that in some cases the Bond EF4 oversize factor calculation is

Get pricewhere CF is the Essbm calibration factor (in the Circuit Settings) for ball mill operating work index versus laboratory ball mill work index. A value of zero means use the Bond/Rowland S formula to predict E ball, a value of 0.05 means use 5% less than Bond/Rowland S formula to predict E ball.

Get price[]### Kinetic grinding test approach to estimate the ball mill

Kinetic grinding test approach to estimate the ball mill work index 345 Kinetic grinding Exactly 700 cm3 of passing 3.35 mm material from each sample was progressively grounded in periods of 0.33, 1, 2, 4, and 8 minutes.

Get priceDownload Citation on ResearchGate Establishment of computation program of bond work index of ball mill of ore crushed by high pressure grinding rolls Molybdenum-Copper ore from Bangpu

Get price[]### The Effect of Circulating Load and Test Sieve Size on

grindability, on the Bond ball mill grindability (G hg) and work index (W,) are investigated based on four samples of natural amorphous silica. In the experimental studies, the relationships between the Bond work index with circulating load and test sieve size were examined. I INTRODUCTION Currently, silica fume is widely used as a

Get priceCalculate the specific energy of each ball mill test, E ball = 10 × Wi (P80-0.5 F80-0.5) Fit the specific energy results for all BM tests, E ball = K × P 80a . Use the power regression model or use logarithms to rearrange and solve for a and K using linear regression of the logarithms.

Get priceThe Bond ball mill grindability test is run in a laboratory until a circulating load of 250% is developed. It provides the Bond Ball Mill Work Index which expresses the resistance of material to

Get priceIt provides the Bond Ball Mill Work Index which expresses the resistance of has been proved on samples of copper and Iron ores that are located in Iran. the bond work index of limestone and andesite mixtures. value is found in a laboratory Bond ball mill ples of limestone, basalt and copper ore and Table 1 Bond's mill

Get priceThe 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

Get price[]### Kinetic grinding test approach to estimate the ball mill

Kinetic grinding test approach to estimate the ball mill work index 345 Kinetic grinding Exactly 700 cm3 of passing 3.35 mm material from each sample was progressively grounded in periods of 0.33, 1, 2, 4, and 8 minutes.

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