SIMPLIFIED BOND WORK INDEX DETERMINATION By: R. O ...

Gb Bond's standard ball mill grindability, net grams p of ball mill product passing sieve size P 1 produced per mill revolution. The rest of the terms are defined as in Equation (1). The work index obtained following the standard Bond grindability test described above predicts the energy requirement for a 2.44 meter (8ft.) inside liners ...

GMSG GUIDELINE: DETERMINING THE BOND EFFICIENCY …

of 2 series) mesh size coarser than the plant ball mill circuit P80. If between standard mesh sizes, the finer of the chose 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

Mill (grinding) - Wikipedia

The power predictions for ball mills typically use the following form of the Bond equation: = where E is the energy (kilowatt-hours per metric or short ton) 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

MODELING THE SPECIFIC GRINDING ENERGY AND BALL …

21 CONCLUSIONS Continued In the present work, equations were also derived, giving: zthe ball-mill power drawP as a function of its dimensions: internal mill diameter D and length L, zthe ball-mill power drawP as a function of the feed D f (mm) and the product size d (mm), the Bond work index w i (kWh/short ton) and the mill throughput T (short ton/h), zthe ball-mill dimensions (D and L), when ...

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grams per revolution (Gbp) is the ball mill grindability. The ball mill work index, Wi (kWh/short ton) is calculated from the following equation (Bond 1961):1 The mill should be cleaned by either blowing air into it or wiping the interior with a cloth and or brush. The FC Bond ball mill …

Bond Work Index (Energy equation) - Grinding ...

You need a two-stage solution, first stage open-circuit mill and then second stage closed-circuit mill. First stage, will be broken into two parts as well, you use a Bond rod mill work index for the coarse component of the ore (+2.1 mm) and the Bond ball mill work index for the fine component (-2.1 mm).

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If the exponent n in Equation [1] is The test work involved Bond ball mill testing, rod milling, low replaced by the values of 2, 1 and 1.5 and then intensity magnetic separation (LIMS), and batch ball milling down integrated, the well-known equations of to product sizes of around P80~25 microns.

bond ball mill work index equation in wills

bond ball mill work equation in wills. The work index (Wi) is calculated in a laboratory-scale ball mill with Bond equation. The Bond work index has been widely used in designing full-scale mills but the Bond test is rather complex lengthy susceptible to procedural errors and this is why attempts have been made to abbreviate and simplify Bond test procedure (Weiss 1985).

Estimation of Grinding Time for Desired Particle Size ...

Jan 03, 2020· Grinding Studies. Two kinds of mills, BBM and LBM, were used to achieve the desired P 80 passing percentage of 150 μm with an acceptable range of hematite liberation (> 75%) at optimum grinding time. The BBM is a standard ball mill having a length and diameter of 300 mm × 300 mm with smooth liner as shown in Fig. 2.A rotating drum is attached to a gearbox and has adjustable speed knob.

Application of Operating Work Indices in Autogenous ...

Ball Mill Wio, BWio 8.6 Circuit Wio, OWio 14.6 Bond Ball Mill Work Index, BWi, kWh/t 13.4 Bond Rod Mill Work Index, RWi, kWh/t 18.1 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 large effect on ...

Levin B - Another BM grindability metric

Dec 09, 2020· The way Levin derived this value is by substituting the Bond specific energy equation into the Bond ball mill work index equation and then reformulating until isolating the industrial mill …

Bond Work Index Procedure and Method

Jun 06, 2015· 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 samples. These equation application methods are used to process <1/2″ ore samples in a Ball Mill using a standard ball charge.. Below describes in general terms the Bond Work Index Procedure used by a Professional Metallurgical Testing Laboratory.

20150505 Bond Efficiency-GMG-ICE-v1-r04 Determining the ...

WiBM Bond Ball Mill Test Work Index (kWh/t) Wic Bond Impact Crushing Test Work Index (kWh/t) WioACT Actual Operating Bond Work Index determined from measurements on the circuit (kWh/t) ... (equation 1). Auxiliary equipment power is excluded. P W = ––– (1) T Where, W is the specific work input (kWh/t), P is the equip- ...

bond ball mill work equation in wills

Equationof Ball Mill Design. Bond Ball Mill Work Index Equation In Wills . Limestone Bond Work Index Hammer Mill Mc. Grindability is bonds work index which is defined as the resistance of the material to grinding.The standard equation used by them for the ball mill work index bond work index is as follows.230.82 1 10 80 10 80 44.5 1.P g p f w i bg i u 4 in designing and

Energy Use of Fine Grinding in Mineral Processing ...

Dec 18, 2013· For P80s finer than 75 μm, the Levin test, a modified Bond ball mill work index test, may be used to predict grinding performance. Signature Plots. No general work index formula governing energy use over a range of conditions, like the Bond equation for intermediate grinding, has yet been found for the fine grinding regime.

Operating work index is not the specific energy consumption

Oct 24, 2018· The Work Index is a fitted coefficient to Bond's equation given in the picture above. The work index can either be measured in the laboratory (the Bond ball mill work index determination is a ...

(PDF) Determination of Work Index of Arufu Lead Ore ...

4. The "feed" test and reference ore were each gathered together and introduced into laboratory ball mill machine and ground for one hour. 5. The test and the reference ores from the laboratory ball mill machine were sized and each sieve fractions was weighed and the …

bond crushing law in ball mill - Marimba Restaurant

Bond ball mill work index reduction after HPGR. Ore. Crusher. crushing and grinding calculations by f c bond allis chalmers. Why is the Bond Ball Mill ... It provides the Bond Ball. ... bond ball mill work equation in wills Mining & World Factorial Experimental Modelling of Ball Milling ... General Crushing Equation By Bonds Law China famous ...

Bond Mill Work Index - mayukhportfolio.co.in

bond ball mill work index equation in wills. Determination of Bond Index of Wasagu Manganese Ore in Kebbi ... work index was to be determined was ground in the same ball mill under same condition as .... Read more. bond's rod mill for work index - Mine Equipments.

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Aug 07, 2020· A Bond Ball Mill Work Index test is a standard test for determining the ball mill work index of a sample of ore. It was developed by Fred Bond in 1952 and modified in 1961 (JKMRC CO., 2006). This index is widely used in the mineral industry for comparing the resistance of different materials to ball milling, for estimating the energy required ...

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Improved characterisation of ball milling energy ...

pressure grinding rolls (HPGR) products based on a Bond mill test procedure. Multiple trade-off studies have reported the performance of HPGR versus SAG milling with energy savings of between 11 and 32 per cent. One factor that is often inconsistently defined in these studies is the change in the Bond Ball Work Index (BBWi).

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determination of the work index for ball and rod mills in 1952 and modified it in 1961. The standard Bond ball mill grindability test is a closed circuit dry grinding test with a 250% circulating load. The standard procedural outline of the test is stated in (Bond) 1961. The work index for a ball mill, Wi, is then calculated from the following ...

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bond ball mill work equation in wills. The work index (Wi) is calculated in a laboratory-scale ball mill with Bond equation. The Bond work index has been widely used in designing full-scale mills but the Bond test is rather complex lengthy susceptible to procedural errors and this is why attempts have been made to abbreviate and simplify Bond ...

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Jun 01, 2020· Ball Mill Bond Work Indexjoelle-nails . Ball Mill Bond Work Index. A bond ball mill work index may also be used in the simulation and optimisation of existing mills and the associated grinding circuits sample requirements a minimum of 10 kg of material crushed to nominally minus 10 mm is preferred jktech would stage crush the sample to minus 335 mm as required for the bond ball mill work …

Correction of Bond Ball Mill Work Index Test for Closing ...

Dec 07, 2018· The goal of this work is to create an equation to adjust a Bond ball mill work index from one P 80 basis to another. The proposed model consists of two components, the variable coefficient that is determined from a specific work index determination and a …

DETERMINATION OF THE BOND'S WORK INDEX OF BABAN …

theoretically infinite feed size to 80 passing 100μm (Wills and Napierpercent -Munn, 2006). Bond devised several methods for predicting ball-mill and rod-mill energy requirements and provided an accurate measure of ore grindability (Gupta and Yan, 2006). The standard Bond