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The Bond Ball Mill Work Index can be used in the design calculations and simulations using JKSimMet of a new grinding circuit. 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).


ball mill work index (13 kWh/t) had SAG hardness as low as 1.4 kWh/t in one case (Aurora) and up to 34 kWh/t in the other case where NICO data was reported in January 2010 at the CMP in Ottawa.


standard 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.


The interaction parameters for f80 of 1000 μm follow the order: interaction between grinding time and work index (BD) > interaction between ball size and solids content (AC) > interaction between ball size and work index (AD).


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


A meaningful expression between bond work index, grindability index and friability value ... The Bond grindability test has been widely used for predictions of ball and rod mill energy requirements and for selection of plant scale comminution equipment ... which is the net grams of undersize produced per mill revolution. "Work Index, ...


Similar to a Comparative Work Index, this test is an open circuit dry batch grindability test run in the standard Bond Ball Mill for a set time. It can be used at mesh sizes from …


The typical log–log plot obtained from Bond's ball mill test. Note Tyler sieve numbers on the x axis ranging from 6 to 200 mesh represent a size range from 3.35 to 0.075


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 ...


The Bond Work Index Before the 1950's the grinding industry had no ability to scale-up grinding results from laboratory to industrial mill sizes, or to reliably estimate the specific energy when either a feed or product size changed.


8-3 Centrifugal force outward Fc mp& 2 Dm 2 (8.1) & 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.


Barratt—Doll method based on the Bond work index-es [3]; ... CALCULATION OF THE REQUIRED SEMIAUTOGENOUS MILL POWER BASED ON THE BOND WORK INDEXES O. I. SKARIN, ... characteristics of the ball mill discharge. Considering the Bond energy law and the correction factors by Rolland, ...


a=Bond's Work Index vs Grindability From Table (III) 1.21 CLICK HERE TO VIEW TABLE(III) b =Correction Factor For Fine Grinding From Table (ii) 1.2 CLICK HERE TO VIEW TABLE (II) c = Correction Index For Mill Type From Table (I) 1.3 CLICK HERE TO VIEW TABLE(I) v = Volume of Mill in m3 30.9171 M3 d1= Diameter of Mill 2.8 t = Mill …


Abstract Research was performed to make a comparison using work bond index results between two laboratory ball mills, each of a different design.


The most common is the Bond ball mill work index: Figure 1: Ball mill for determining Bond ball mill work index Many people refer to "the" Bond work index when they really mean the Bond ball mill work index.


Only relatively small quantities of sample are required and can be re-used to conduct Bond ball work index tests. The results from conducting the SMC Test® are used to determine the so-called drop-weight index (DWi) which is a measure of the strength of the rock as well as the comminution indices Mia, Mih and Mic .


Bond for 50 mm > d > 0.05 mm ... W is the work index measured in a laboratory ball mill (kilowatt-hours 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.


A New Approach to the Calculation of Work Index and the Potential Energy of a Particulate Material ... factors have been adapted by Bond [5]. The present work is an effort to show that the devia- tion of the . W. i. ... a laboratory ball mill, a labora-


the Bond work indexes of crushing, rod milling and ball milling. The authors exemplify the described method application and compare the obtained estimates with the factual field test data.


The resultant operating work index of the ball mill will vary according to the ratio of the ball mill, rod mill and crushing work index values and is in the range of 80% of the measured ball mill work index value.


Index Test, The Bond Rod Mill Work Index Test and the Bond Ball Mill Work Index test. All of these tests are done in a dry environment and are empirically calibrated against many actual plant measurements


Bond work index analysis is based on energy usage. Because energy costs and the ... ball mill circuit "classification system efficiency" (CSEff). It is the percentage of "coarse" material in the ball mill, ... factors, such as grinding ball sizing and percent solids in the mill. A standardized lab grindability test can be car-


The Bond Ball Mill Work index (BBWi) is the industry standard procedure for assessing the grindability of ores. The test involves conducting a locked-cycle grinding test using ond's standard mill design.


See this useful summary Table of Bond Work Index by Minerals. For any circuit, whether a crushing circuit, a rod mill, or a closed ball mill circuit, the Work Index always means the equivalent amount of energy to reduce one ton of the ore from a very large size to 100 um.


Ball Mills Our combined experience in ball mill design and process equipment development totals more than 60 years and allows us to put a unique spin on steel and lined mills. Particle size reduction of materials in a ball mill with the presence of metallic balls or other media dates back to the late 1800's.


bond work index ball mill design and safety factors. bond work index ball mill design and safety factors Basic Comminution Concepts and Recent Trends in the Industry ... Another factor is that a material ... » Learn More. Trends with selection and sizing of large grinding mills ...


Ball Mill Bond Work Index For Limestone – Gold Ore Crusher Mobile Cone Crushing Plant; … bond ball mill work index – crushing and … The Mining Machine is custom designed to reduce your operating costs and …


Dec 12, 2016· 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).


using Bond rod mill work index (RMWI), and Bond ball mill work index (BMWI). However, the author has developed a ... factor to the Bond SE value corrections are made for the SG, Ab values and low aspect (LA) mill confi guration if applicable. ... an ineffi ciency value in the region of 1.25 because the design 80 per cent passing value …


Correlations for the Grindability of the Ball Mill As a ... produce a specified tonnage and the power requirement for grinding. ... used by them for the ball mill work index (Bond work ... five factor factorial design.


power-based design and analyses of conventional grinding circuits (Bond ... Bond Ball Mill Work Index, BWi, kWh/t 13.4 Bond Rod Mill Work Index, RWi, kWh/t 18.1 ... can be a major factor in AG/SAG mill product size distribution, Figure 2 compares only data for porphyry ores.


The 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 …