Jul 31, 2014· Semi-Batch Dry Grinding Tests of a Pilot Scale Vertical Stirred Mill Proceedings of VIII Balkan Mineral Processing Conference, Belgrade, Yugoslavia Rowland, CA, 1975 "The tools of power: How to evaluate grinding mill performance using Bond Work Index to measure grinding efficiency" AIME Annual Meeting, Tucson, Arizona

comminution plants designing Determining the Bond work index value is quite complicated, time-consuming and requires trained operating personnel and therefore is subjected to errors A quick method for the Bond work index approximate value determination, which is based on the first order grinding kinetics, is presented in this paper

A New Approach to the Calculation of Work Index and the Potential Energy of a Particulate Material Elias Stamboliadis, Stamatis Emmanouilidis, Evangelos Petrakis , tests which is similar to the Bond test but with the exist- ing mill of known power After time the mill product is t wet screened at a predetermined screen size From the

The Bond Ball Mill Work Index is a measure of the resistance of the material to grinding in a ball mill It can be used to determine the grinding power required for a given throughput of material under ball mill grinding conditions It is a 'locked cycle' test conducted in closed circuit with a laboratory screen

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 which expresses the resistance of material to .

Quick method for bond work index approximate value determination 331 , 3327 mmIn this work, a procedure for the calculation of the Bond work index is suggested for cases when the Bond .

Bond Grinding Circuit Efficiency Meeting of Bond Efficiency Guideline Working Group of the Global Mining and Standards Group Salt lake City, 2014 Based on Presentation to the 2008 Meeting of SME, by CA Rowland, Jr and RE McIvor Bond Grinding Circuit Efficiency • The Bond Work Index equation • Ore test WI • Circuit operating WI

JKTech Laboratory Services Bond Ball Mill Index Test (BRMWI) 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

from 14 to 34 kWh/t and Bond ball mill work index values vary from 6 to 24 kW/t for the same or Project design tonnages varied from 200 to 150,000 t/d, SAG mill sizes varied from 10 ft to 40 ft diameter in multiple SAG mills, and ball mill sizes varied from 7 ft to 27 ft in diameter

Based on the nth order grinding kinetic equation and the theory of linear additivity in the grinding process, the grinding kinetic characteristics of the feed and the circulating load in standard Bond rod-mill grindability tests are studiedA new method of simulating the calculation of the Bond rod-mill work index by using the grinding kinetic test data of the feed is proposed

The Bond's standard ball mill is used to determine the work index value of differ ent sampl 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 .

Correlations for the Grindability of the Ball Mill As a Measure of , standard equation used by them for the ball mill work index , to bond index calculation where the power consumption will indicate directly about the cost »More detailed

May 18, 2013· This video was put together by Joshua Wright and Aldo Vasquerizo as a supplemental lecture for University of Nevada Reno If you have any questions, need advice, or need to conduct a ,

Dry Grinding work index is 134 times wet grinding index Open circuit work index is 134 times closed circuit work index Questions: 1 Plot the initial distribution and distributions obtained after sieving 2 Calculate the surface volume diameter in each case 3 Obtain the diameter D80 for ,

Bond Ball Mill Work Index, BWi, kWh/t 134 Bond Rod Mill Work Index, RWi, kWh/t 181 Table 1 Example of AG/SAG 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 ,

Nov 18, 2014· Test design Slide 12 Main purpose Maximum Capacity Cost low Energy Size Division Less fines Production Bond's work index 13 Test design Slide 13 Effect of circulating load on Bond's work index The follow figures shown variation in the Bond work index ,

mill was measured using a purpose built power meter to facilitate the calculation of specific grinding energy Results Table I shows the Bond ball mill work index obtained for the ore samples as well as the iron and silica content in concentrate and tail after LIMS The concentrate weight recovery was in the order of 50–60% Furthermore it may be

CONTRIBUTION TO DETERMINATION OF COAL GRINDABILITY USING HARDGROVE METHOD P , of Hardgrove Grindability Index (HGI) values to Bond Work Index (Wi) Paper also provides information on , results of tests by Bond For the calculation of work index Wi from HGI values Bond (1954) proposed by the following formula: 88 W

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 The test is a closed-circuit dry grindability test performed in a standard rod mill

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 ,

bond ball mill work index ( kilowatt hours / dry tonne ) : 290 sample identity bond ball mill grindability test feed and product sizings variability composite #56 a13575 feed to period equilibrium products , client vista gold corporation: mt todd feasibility project no a13575

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 The test is a closed-circuit dry grindability test performed in a standard rod mill

work index covering grinding of fine particles is labelled M ib (Morrell, 2008) M ia values are provided as a standard output from a SMC Test® (Morrell, 2004a) whilst M ib values can be determined using the data generated by a conventional Bond ball mill work index test (M ib is NOT the Bond ball work index) M ic and M ih values are also .

Drop Weight Index (DWi) and the coarse ore grinding index (M ia) Test data from the Bond ball mill work index test is used to calculate the fine grinding index (M ib) The M ia and M ib indices are used to calculate specific energy for the coarse (W a) and fine (W b) components of the total grinding specific energy at the pinion (W

Hello Everyone, I am dealing with the calculation of Bond Work Index The flowsheet is attached I have calculated primary ball mill bond index but for the calculation of second ball mill bond index I got trouble In a bond energy equation, where should I select tonnage ? and where should I pick

rod mill work index has not been de ned as yet The ball ﬁ mill work index is con rmed at 16 kWh/t The operating ﬁ work index, though, is in the range of 21 kWh/t to 25 kWh/t showing high inefﬁ ciency This raises the point that, in some cases, the Bond EF4 oversize factor calculation ,

that is used has come from a Bond ball mill work index test that has generated a similar value to that input to the “Tumbling mill circuit product P80- final grind” field If this is not the case the resultant specific energy prediction accurate might be compromised

Bond Work Index Procedure and Method 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 sampl

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 particl

BENCH SCALE COMMINUTION TEST WORK qBond Work Index Testing Bond Ball Work Index Bond Rod Work Index Bond Crushability Work Index Bond Abrasion Work Index qJK Tech Testing JK Drop weight Test SAG Milling Comminution Test (SMC) COMMINUTION PILOT PLANT qAG/SAG Pilot Milling Mill dimensions: Ø17m x 06m length , and process efficiency .

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