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Testing method for ball mills - Outokumpu Technology Oyj

One test is called Bond ball mill test, which results a parameter providing a standard net power requirement for grinding. The test is conducted on ore stage-crushed to minus 6 mesh, i.e. the ore is crushed so that all ore is going through a screen having quadratic apertures of 3.35 millimeter (6 mesh) and further ground to minus 100 mesh ...

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Measurement of electrical energy consumption in a Bond ...

determined by 0.0254 Wh/rev (difference between 0.1331 and 0.1077) or 91.44 Ws/rev. This is equivalent to a power draw of 106. 76 W for the mill with ore and balls and is. very comparable to …

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Using Rock Geomechanical Characteristics to Estimate Bond ...

Bond Ball/Rod Mill Work Index. Bond ball mill work index (BBMWI) test is a standard test used to measure the ball mill work, which is calculated in accordance with the procedure proposed by the Bond [21]. The BBMWI determines how much energy is needed to grind a sample of ore in a ball mill [22].

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Morrell C-model - SAGMILLING

Morrell C-model. Applies to both SAG and ball mills, with variants for grate-discharge and overflow mills. This model was developed as part of the PhD thesis of Stephen Morrell at the University of Queensland and is the model used in the …

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Bond Work Index Formula-Equation

Ball Mill Design/Power Calculation

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Geometallurgical Modelling of the Collahuasi Grinding ...

Ball Mill P (KW) Pebble Crusher P80 JKSimMet Simulation Bond Equation tph tph T80 1.-The instantaneous throughput was increased for each iteration. 2.-SAG Mill was simulated using JKSimMet. For each iteration, the SAG mill power draw, total load and transfer size were recorded as shown in the table below. 3.-

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Ball Mill Design/Power Calculation

C = distance of centre of gravity or charge from centre of mill in feet a = dynamic angle of repose of the charge N = mill speed in RPM HP = A x B x C x L Where A = factor for diameter inside shell...

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Modelling the Specific Grinding Energy and Ball-Mill ...

Bond work index: Wj= 26.0 kWhlshort ton From Eq. (6), the specific grinding energy is: W = 77.34 kWhlshort ton or W = 85.23 kWhlt For throughput 400 tIh production, the total required ball-mill power is: 85.23 kWhlt x 400 tIh = 34092 kW. If six (6) ball-mills are used, the power drawn from each mill is: (34092/6) = 5682 kW.

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Metcom Training

2. Mill Power Draw To determine mill power draw characteristics and capabilities for rod, ball and AG/SAG mills. $139: none: 2.50: 3. Mill Power and Charge Level Measurements To determine the actual mill power draw and volumetric load of your mill from plant readings and measurements. $139: 2: 2.50: 4. Work Index Efficiency

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Development of a methodology and validation of the ...

2 ABSTRACT Development of a methodology and validation of the Geopyörä breakage test Tabatha Chavez Matus University of Oulu, Master's Program in …

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Improved characterisation of ball milling energy ...

As highlighted by Levin (1989), the results from the Bond test can be used to calculate the predicted power draw of the mill. The standard Bond (1952) equation can be used to calculate the specific energy required to go from a specific feed particle size (F 80) to a product size distribution (P 80): (2) Specific energy (kWh / t) = 10 BBWI (P 80 ...

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Ball Mill Design/Power Calculation

C = distance of centre of gravity or charge from centre of mill in feet a = dynamic angle of repose of the charge N = mill speed in RPM HP = A x B x …

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Calculating Crushing Constant Using Bond S Law

modelling the specific grinding energy and ball-mill scaleup ball-mill scale up bonds lawdata zbond work index w i zfeed d f and product d size both 80 cumulative passing result the specific grinding energy w mill power draw p wt, where t the mill capacity mill dimensions from tables or charts. Read More

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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 ( …

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CALCULATION OF THE POWER DRAW OF DRY …

of two or more grate discharge ball mills in series. The same equation is used to calculate the power that each ball mill compartment should draw. The total power is the sum of the power calculated for each of the separate compartments. Although, Bond's method has been widely used, the required link to classification is missing.

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Energy Benchmarking - SMC Testing

Throughput was hence estimated to be 1636 dry tonnes/hr. Power draw data were confirmed as being measured at motor input. The Morrell Method for grinding mills is based on predicting the specific energy at the pinion shaft. To adjust the power draw measured at the motor input to power at the pinion a 6.5% correction was made.

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Collahuasi case study - Okar Geo

It important to note that as P80 increase the SAG power consumption decrease as a function of the transfer size product figure 4.2.2.1B. Specific mill power consumption (S.P.C) is determine using simple power equation 3. P= Ball mill circuit power draw. Wi= Bond laboratory work index (kWh/t) tph= SAG circuit throughput. P80= Ball mill circuit ...

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GMSG GUIDELINE: DETERMINING THE BOND EFFICIENCY …

closing screen for the ball mill test one (standard square root 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 …

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20150821 Morrell Method-GMG-ICE-v01-r01 Morrell method …

3. Power draw of the comminution equipment (kW) •In the case of mills, the power draw should be repre-sented in terms of power at pinion for gear and pin-ion drives and at shell for gearless drives. For crushers, this should be the net power draw, that is, the gross (motor input) power draw less the no-load power. 4.

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Calculation Of Power For Ball Mills And Grinding- EXODUS ...

This ball mill and rod mill power draw model is based on a torque model and empirical measurements made by the equipment company for use by its sales representatives to size grinding mills slight differences in the equations used allow rod mills,Calculation Of Power For Ball Mills And Grinding.

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SAGMILLING .:. Articles

Correction of Bond Ball Mill Work Index Test for Closing Mesh Sizes It is commonly known that one must run the Bond ball mill work index test such you pick a closing mesh to give a P80 close to desired grind size.

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Model:Bond/Barratt SABC Models - SAGMILLING

Bond/Barratt Specific Energy Consumption SABC Model. This is a SAG or AG mill plus ball mill model that estimates the overall circuit specific energy consumption using the classical Bond work index equation for multi-stage crushing and single-stage ball milling (E ssbm) including Rowland efficiency factors.The circuit E total is equal to the E ssbm plus an inefficiency factor …

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SAGMILLING

Bond HPGR and ball mill model (using work indices) warning, experimental! Morrell HPGR and ball mill model; Mill power draw models. Measurement of power (motor input versus shell, etc.) Media density for rods and balls; Model types: mill power draw. Austin SAG model (hybrid phenomenological and empirical model)

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Ball Mill Design/Power Calculation

If P is less than 80% passing 70 microns, power consumption will be. 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 ...

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Bond Grinding Circuit Efficiency - ceecthefuture

• The Bond Work Index equation • Ore test WI • Circuit operating WI • Grinding circuit WI Efficiency • Example calculations • Data base examples • Conclusions 2. ... SS ball mills, Rowland 1998 87% 1.15 x Ball mills: Rod-ball, Selbaie, McIvor 1988 1.0 x Rod-ball, Dome, McIvor 1995 130% 0.8 x ...

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Grinding Mill Computer Model

Rowling are used to calculate the mill power draw. The Morgärdshammar equation and the IMM equations are shown for comparison. The method of use is similar to the AM section 3.3 Ball Mill Design The ball mill designs also follow the Bond/Rowlings method with comparison with other methods. Again the method of use is the same

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

tion related to the operation of the circuit (F80, P80, power and mill feed rate). 7.DETERMINING THE BOND EFFICIENCY OF A GRINDING CIRCUIT 7.1Method In the plant: 1. Define the circuit for which the Bond Efficiency is to be determined. 2. Procure samples of the circuit feed and product. 3. Obtain the power draw of the size reduction equipment