bond crushing index power draw

Operating work index is not the specific energy consumption

Oct 24, 2018· To calculate the operating work index of a circuit, you must measure four things: P: The power draw of the mill. This is usually calculated from the input leads to the motor, then multiplied by ...

Bond Work Index Formula-Equation

Bond Impact Crushing Work Index -Procedure and Table of ...

bond 3fs law for crushing mills

bond crushing law and and work index educationcare.in. What is bond's law of crushing Answers. Where Kb is a constant that depends on the type of machine and on the material being crushed. To use this equation, a work index Wi is . Rock Crushing Theory and Formula using Kick & Rittinger's Law.

Mineral Processing - SlideShare

May 15, 2014· F = size of the screen opening ( microns ) through which 80% of the feed passes. Wi = The Bond Ball Mill Work index ( 1952 )- is a measure of the resistance of the material to crushing and grinding . A Bond Ball Mill Work Index test may be required for the design of a new mineral processing plant .

SAGMILLING.COM

Morrell multi-stage crushing and single-stage ball mill model; 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

Using the Bond work index to measure operating comminution ...

Nov 01, 1998· Using the Bond work index to measure operating comminution efficiency C. A. Rowland 1 Mining, Metallurgy & Exploration volume 15, pages 32–36 ( 1998 ) Cite this article

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The introduction of the secondary crushing stage by Fr eda Rebecca which started as a trial in Ma y. 2014 resulted in an increase of throughput of 11% from an average throughput of 77 - 82tph t o ...

Hammermill Crushers | McLanahan

Bond Theory – This Comminution Theory, developed by Fred C. Bond, establishes a process for determining a work index (Wi) associated with a given material classification. The work index is the comminution parameter that expresses the resistance of the material to crushing and grinding.

MODELING THE SPECIFIC GRINDING ENERGY AND BALL-MILL …

2 MODELLING THE SPECIFIC GRINDING ENERGY AND BALL-MILL SCALEUP Ball-mill scale up (Bond's Law)Data: 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 …

Comparison between bond crushing energy and fracture ...

predict the power draw of mills with reasonable accuracy over a wide range of mill diameters2,3. More than 10 years since then, ... Comparison between bond crushing energy and fracture energy of rocks in a jaw crusher ... the Bond index. There is considerable difference between Bond

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BLASTING INFLUENCE ON COMMINUTION

work index. Softer material will have a lower work index and harder material will have a higher work index. The effect of Work Index on the required SAG mill power draw is shown in Figure 1. For the example calculation, a 10.4 meter diameter by 5.2 meter long mill with a 25% stee, l ball charge of 12.7 cm

Crushing / Screening and Conveying

Bond work Indices, Abrasion Index, and specific power consumptions. Information Gained. Calculation of specific power consumption at each comminution stage for different ore types and composites. Assessment of ore variability. Checking on pilot plant test data. Assessment of risk or contingency based on samples selected according to the mine plan

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.

CORRELATION BETWEEN BOND WORK INDEX AND …

correlation between the abrasion value(X2) and work index (Wi) is found to be Wi = -1.8 Ln (X2) + 11.5 with correlation coefficient of 0.80. KEYWORDS: Bond work index ± Mechanical properties of rocks ± Grinding energy- Crushing resistance 1- INTRODUCTION Comminution in a mineral processing plant, or mill, involves a sequence of crushi ng

Use of rock mechanical properties to predict the Bond ...

Jun 01, 2007· Crushing energy using Bond's index. It is assumed that a 10 cm height cubic shape specimen and a 10 cm diameter spherical shape specimen are crushed between two rigid jaws and its dimensions are reduced to <2 cm. To predict the energy consumption during size reduction process, Bond's relationship that is expressed as following is used ...

QUICK METHOD FOR BOND WORK INDEXAPPROXIMATE …

Abstract: The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test. Its value constitutes ore characteristic and is used for industrial comminution plants designing. Determining the Bond work index value is quite complicated, time-

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The Power draw by a mechanical sys-tem is given by: Power = Force x Displacement per unit of time [1] ... rently crushing some corundum (Bond Work Index = 28kWh/t at 400µm, compressive strength up to 700MPa). Some tests have been performed on martensitic steel balls or hard hematite iron

Bond Work Index - an overview | ScienceDirect Topics

The Bond work index ( Bond, 1960) is based on Bond's law, which states that the energy consumed is proportional to the 1.5 power of particle size rather than the square of Rittinger's law. Accordingly, the energy consumed in reducing the particle size from x F to x p (both measured as 80% undersize) is given by.

Losses and Dispersion in Waveguides

group index (ng): for a given mode propagating in a medium of refractive index n, the velocity of light in vacuum, c, divided by the group velocity of the mode. Note: For a plane wave of wavelength, the group index may also be expressed, where n is the phase index of wavelength, ng is value is slightly larger than n. ng =n-λ(dn/dλ)

GMSG GUIDELINE: DETERMINING THE BOND EFFICIENCY …

Use of the Bond Work Index to size industrial grinding equipment ... The Bond Crushing WI Test Equipment and Procedure for Bond Efficiency Determinations (Revised March 26, 2015) B1. The Bond Rod Mill WI Test Equipment and Procedure ... Power draw Standard of mill(s) (@ pinion(s)) = 3,150 kW . …

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Predicting the overall specific energy requirement of ...

May 01, 2009· 1.. IntroductionTwenty years ago discussions about conventional comminution circuits would revolve around crushing-rod-ball or crushing-ball circuits and the work of Bond (1961) would provide the principal tools to aid in their design. Nowadays, such circuits are all but obsolete and are mainly confined to relatively small operations.

Bond Definition: Understanding What a Bond Is

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Bond Grinding Circuit Efficiency - ceecthefuture.org

Closed circuit crushing to 16 mm Open circuit 8' dia. rod mill to 1 mm Closed circuit 8' dia. ball mill to P80 um The ore Test Work Index = Circuit Operating Work Index 9 The Standard Bond Circuit Coarse Ore Bins Fine Ore Bins Screen Crushing Screen Classification Rod Mill Ball Mill THIS IS THE REFERENCE BASIS FOR ALL WORK INDEX EFFICIENCY ...

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(PDF) A quick method for bond work index approximate value ...

The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test. Its value constitutes ore characteristic and is used for industrial ...