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Bond Ball Mill Work Index Equation In Wills :

Bond Work Index - an overview ScienceDirect Topics

The ability to simulate the Bond work index test also allows examination of truncated ball mill feed size distributions on the work index. For grinding circuits where the feed to a ball mill is sent directly to the classifier and the cyclone underflow feeds the ball mill (see Figure 3.10), a question arises as to whether this practice will alter the ball mill work index (BW i) of the material ...

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Bond Work Index Procedure and Method

2015-6-6  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.

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GMSG GUIDELINE: DETERMINING THE BOND

2018-2-20  Bond Test WI’s (kWh/t): Rod Mill: Ball Mill: 9.5 kWh/t.8 9 kWh/t . Bond Standard Circuit Work Index: Assume the rod mill Work Index of 9.5 applies from the actual rod mill feed sizeof 19,300 mµ (although some of this work might ideally be done by crushers to achieve a rod mill F80 of 16,000 m) to a rod µ

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CORRELATION BETWEEN BOND WORK INDEX AND

2014-6-27  3- STANDARD BOND TESTS 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 to break from infinite size to a product size of

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Relationships between comminution J energy and

2015-4-16  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 observed that the Bond ball mill work indices for the ore (Wi) varies from 14.6 to 20.9 kWh/t.

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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 ...

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Operating work index is not the specific energy consumption

2018-10-24  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 ...

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Energy Use of Fine Grinding in Mineral Processing ...

2013-12-18  It can be seen that in the regime in which the Bond equation is valid, energy use increases exponentially as product size decreases with constant feed size, with an exponent of (approximately) −0.5. For P80s finer than 75 μm, the

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SAGMILLING.COM .:. 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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MODELING THE SPECIFIC GRINDING ENERGY AND BALL

2021-2-24  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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Operating work index is not the specific energy consumption

2018-10-24  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 ...

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Bond Index Ball Mill / Rod Mill BT 100 XL - RETSCH

The Bond Index conforming rod charge consists of: 6 rods of 1.25“ diameter and 21“ length. 2 rods of 1.75“ diameter and 21“ length. The grinding jar for the Bond Index Rod Mill is 12″ x 24″ in size and has a wave-shaped design. At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill.

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Size Reduction and Energy Requirement - ScienceDirect

2016-1-1  A Bond ball mill work index is then performed on the mill product for the design of SAG-ball mill circuits. This is important because it was found that there was a 1–1.5 kWh/t higher ball mill work index if the –3.35 mm ball mill test feed size is obtained by SAG mill grinding compared with crushing.

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AMIT 135: Lesson 7 Ball Mills Circuits – Mining Mill ...

Mill Type Overview. Three types of mill design are common. The Overflow Discharge mill is best suited for fine grinding to 75 – 106 microns.; The Diaphram or Grate Discharge mill keeps coarse particles within the mill for additional grinding and typically used for grinds to 150 – 250 microns.; The Center-Periphery Discharge mill has feed reporting from both ends and the product discharges ...

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Metcom Training - metcomtech

4. Work Index Efficiency To determine the Work Index calculations for evaluating grinding circuit efficiency, as initially developed by Mr. Fred Bond. $199: none: 3.50: 5. Functional Performance of Ball Milling To determine ball mill circuit performance in terms of the elements of the functional performance equation. $199: none: 2.50: 6.

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An Overview Of the SmAll-ScAle teStS AvAilAble tO ...

the ball mill test, the test can also be closed with various sieve sizes, but for AG/SAG mill analyses the standard 14-mesh (1.18 mm) sieve is typically used. The rod mill work index is computed with an equation very similar to that of the ball mill test, as follows: The rod mill work index is also normally distributed. The database average and ...

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Estimating Ball Consumption - Molycop

The work performed included analysis of operating performance data from 49 mills and included extensive determinations of the Bond Abrasion Index for different ore types. For an improved understanding, the wear rate constant is directly related to the grinding

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These constants can be determined by measuring the

He defined the work index (W i) for a material as 0.1 K B. Then Bond ’ s law becomes The chart at the right contains the typical values of the work index. Note that when the work index was determined, the units of size were in microns, so microns must be used in calculating the size reduction energy using the Bond work index method.

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Tools - SMC Testing

2021-11-30  Work out the number of samples needed to achieve your target accuracy. Comminution Specific Energy. Estimate Total Specific Comminution Energy from ROM to Final Grind using SMC Test® and Bond Ball Work Index Test. Gross Power Calculator. Predict motor input power. Find a

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An Overview Of the SmAll-ScAle teStS AvAilAble tO ...

the ball mill test, the test can also be closed with various sieve sizes, but for AG/SAG mill analyses the standard 14-mesh (1.18 mm) sieve is typically used. The rod mill work index is computed with an equation very similar to that of the ball mill test, as follows: The rod mill work index is also normally distributed. The database average and ...

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3. Using the following equation for calculating the ...

Bu ton where: Bwi = Bond work index for ore, kWh/ton (ton = short ton or st =2,000 lbs); dsop = 80% passing size for product from crusher or grinding mill in microns. d80F = 80% passing size for feed to crusher or grinding mill in microns.

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MILLING ANALYSIS OF PARTICLES AUTUMN 2010

2016-3-21  In our lab course, we will work with a centrifugal ball mill. The feedstock can be filled up to 10 mm and will be milled to particles of about 1 μm. The mill consumes a maximum power of 100 W. (Do not assume the mill produces 100W of comminution power) In Fig. 6 the parts of the mill are described. A B C Figure 6: Centrifugal ball mill

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Engineering Sustainability of Mechanical Recycling of ...

2016-5-18  The basic energy, W, is calculated by the empirical Bond equation which expresses the correlation between material toughness and power required in the comminution machine [15]. The work done in reducing a mass of material from representative size 80 𝐹 to representative size 80 𝑃 is given by the bond Equation (3) W= K (1 ( 80 𝑃) 1/2− 1

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Global Mining Guidelines Group Guidelines

The guideline reviews the data required for the analysis, including hardness characterization data generated from the SMC Test® and Bond Ball Mill Test Work Index, presents the Morrell equations and their applications, and provides a

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Metcom Training - metcomtech

4. Work Index Efficiency To determine the Work Index calculations for evaluating grinding circuit efficiency, as initially developed by Mr. Fred Bond. $199: none: 3.50: 5. Functional Performance of Ball Milling To determine ball mill circuit performance in terms of the elements of the functional performance equation. $199: none: 2.50: 6.

Read More
Advances in Discrete Element Method Application to ...

2014-8-15  Grinding mill modeling has attracted the attention of a number of researchers ever since Bond published his method of energy calculation with an index called Bond work index (Bond 1961). In the 1970s, the population balance or selection and breakage function model was at the forefront of research (Fuerstenau et al. 1973).

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Ball mills - Metso Outotec

First, a Jar Mill grindability test requires a 5 lb. (2 kg) sample and produces a direct measured specific energy (net Hp-hr/t) to grind from the design feed size to the required product size. The second test, a Bond Work Index determination, results in a specific energy value (net Hp-hr/t) from an empirical formula.

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Tools - SMC Testing

2021-11-30  Work out the number of samples needed to achieve your target accuracy. Comminution Specific Energy. Estimate Total Specific Comminution Energy from ROM to Final Grind using SMC Test® and Bond Ball Work Index Test. Gross Power Calculator. Predict motor input power. Find a licensed laboratory.

Read More
These constants can be determined by measuring the

He defined the work index (W i) for a material as 0.1 K B. Then Bond ’ s law becomes The chart at the right contains the typical values of the work index. Note that when the work index was determined, the units of size were in microns, so microns must be used in calculating the size reduction energy using the Bond work index method.

Read More