Worked Examples Involving Bonds Equation In Grinding Mills

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Bond Work Index (Energy equation)

BOND WORK INDEX. The Bond Work Index is a factor that measures the energy consumed in size reduction operation of the ore. The Bond's Work Index equation is: …

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worked examples involving bond s equation in grinding mills

Jan 01, 2016· This equation reverts to the Bond equation (Equation ) by taking the value of B as 12 and integrating; thus, (3.7) E = k 1 P 6 12 − 1 F 6 12 which in effect is the Bond equation. Bond's original work on establishing the energy for size reduction was established in a 2.44 m (8 foot) internal diameter wet grinding overflow type ...

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Bonds Law Equation In Mining Mills

For example, for a sample with 20% of –300 μm material in the feed, if this is not scalped out of the fresh feed, then the mill charge, at 250% circulating load will contain 0.2/3.5 or ... (Energy equation) Grinding. The Bond's Work Index equation is: W=WI* (10/√P80 -10/√F80) where W= the energy input (Work input) per ton, kwh/metric ton ...

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How to Calculate Grinding Mill Operating Efficiency

The Bond Equation as found in reference 5 is: W = 10Wi/p0.5 – 10Wi/p0.5. Where: W = kwh per short ton. Wi = Work Index determined from crushing and grinding tests. P = The size in microns (micrometers) that 80% of the product is finer than. F = The size in microns (micrometers) that 80% of the feed is finer than.

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Bond Work Index

The Bond work index is not solely a material constant but is influenced by the grinding conditions. For example, the finer the grind size desired, the higher is the kWh/t required to grind to that size. Magdalinovic [38] measured the Bond work index of three ore types using different test screen sizes. He produced a correlation between the mass of test …

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A new approach to the calculation of bond work index for

The Bond work index (BWI) is a well-known method used when selecting comminution equipment, to evaluate the grinding efficiency and to calculate the required grinding power. Although considered an ...

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worked e amples involving bond s equation in grinding mills

Only relatively small quantities of sample are required and can be reused to conduct Bond ball work index tests. Introduction to Mineral Processing . The crushed copper ore (containing, for example, % Cu and % Mo) is fed to the grinding circuit where water is added and the ore is ground to the proper size.

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Determining the Bond Efficiency of industrial grinding …

2|DETERMINING THE BOND EFFICIENCY OF INDUSTRIAL GRINDING CIRCUITS Calculations: 1. Calculate the Actual Operating Bond Work Index of the grinding …

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Standard Bond Ball Mill Grindability Test Method-Procedure

The Wi value from this equation should conform with the motor output power to an average overflow ball mill of 8 ft. interior diameter grinding wet in closed circuit. For dry grinding the work input should normally be multiplied by 1.30. However, ball coating and packing can increase the work input in dry grinding.

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Bond Grinding Circuit Efficiency

Example SAG-Ball Mill Circuit WI Efficiency Calculation. SAG-ball circuit F80 = 165,000 um P80 = 125 um W = 14.6 kWh/t Wlo = 14.6 / [( 10 / SQRT 125) – (10 / SQRT 165,000)] = …

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Rapid determination of Bond rod-mill work index by …

To calculate Bond rod-mill work indices, the four samples were screened and the particle size distributions plotted in Fig. 2.The plot was used to find F 80 of the samples for calculations. Fig. 3, Fig. 4 show the grinding kinetics of Pb, Cu, Fe, and Mn ores in the Bond rod-mill in different test-sieves. The slopes of all lines in the figures are …

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Prediction of Bond's work index from field measurable rock …

Generally Bond work index for mill dimensioning and controlling is measured by grinding a feed material of less than 3.36 mm (− 6 mesh) particle size under standardized conditions in a Bond's mill (Diameter × Length = 305 mm × 305 mm). Bond's method simulates closed-circuit grinding which is carried out in sections until the …

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Estimation methodology for Bond ball mill work index …

A standard Bond mill (Fig. 1) was designed to perform the work index tests and determine the energy consumption of various s minerals.The mill has a round internal housing at the corners, has no lifters, and is for dry grinding. The inner diameter and the length are 0.305 m, and the ball load is 19.4% of mill volume (equaling a total weight of …

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DETERMINING THE BOND EFFICIENCY OF INDUSTRIAL …

The outcome of these tests provides Standard Circuit Bond Work Index (WiSTD) values of the ore for crushing (WiC), rod milling (WiRM) and ball milling (WiBM). The W values …

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Procedure for determination of ball Bond work index in …

Section snippets Grinding kinetics in the Bond ball mill. Tests of grinding kinetics in the Bond ball mill (Fig. 1, Fig. 2) has shown that over a shorter grinding period, the process follows the law of first order kinetics R = R 0 e-kt where R = test-sieve oversize at the time (t); R 0 = test sieve at the beginning of grinding (t = 0); k: grinding rate …

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Can I use BWi Bond Work Index to Size a Regrind Mill: Fine Grinding

Bond's model is most commonly used to describe primary and secondary grinding to product sizes above, for example, 100 µm. Operators sometimes use Bond's equation to describe grinding in situations where it is not appropriate, such as fine grinding below 50 µm. Using an alternative model would be a better choice in this …

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worked examples involving bonds equation in grinding mills

2022 6 6 MODELING THE SPECIFIC GRINDING ENERGY AND BALL MILL SCALEUP, Introduction of the Bond work index w i to the above equations, MILL DIMENSIONS D x L Example 20 example of a grinding mill pre. The Raymond grinding mill was ever popular in mining, building materials,, worked examples involving bond s equation in …

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Secrets of the Bond Ball mill grindability test

Maxson et al, (1933). It was extended by Bond (1952) to provide a work index result that was empirically calibrated to make a laboratory work index match the corresponding work index measured in an industrial grinding mill. The fitted equation, in metric form, is given as Equation (1). (1) 𝑊𝑖= 1.1023×44.5 𝑃100 0.23× À0.82×(10 √ ...

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GMSG GUIDELINE: DETERMINING THE BOND …

Part 1. Determining the Bond Efficiency of a Grinding Circuit . Method . Demonstration/Example Calculations . Bond Work Index Testing Equipment and Procedures . Accuracy of Comparative Circuit WI Efficiency Determinations (under development) 10/List of Symbols . Part 2. Data Base of Bond Grinding Circuit …

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BOND'S WORK INDEX: WHAT IT IS AND WHAT IT ISN'T

Examples of the variation in work index at Centerra's Mount (Mt.) Milligan mine and the implications for mill operation and design will be discussed. A revised definition of work …

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Variability of the Ball Mill Bond s Standard Test in a Ta …

Once ﬁnished the grinding cycles, a minimum of ﬁve, the ball mill Bond's work index w i [kWh/sht] can be calculated using Equation (2). In order to express it in metric tons, the corresponding conversion factor must be used. wi = 44.5 P0.23 100 gbp0.82 p 10 P80 p F80 (2) where: w i is the ball mill Bond's work index [kWh/sht];

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Chapter 20 Modelling of Mills and Milling Circuits

There are few general approaches used in generating data for the steady-state modelling of mills and milling circuits: 1. Breakage functions and breakage probabilities are measured in single particle test devices using the same stress type as in the mill of interest (very well applicable for impact grinding) [19]. 2.

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Fine Grinding

Roughly measuring the slopes in Figure 1 and plotting at the mid-points of the base-10 logarithms gives the variation of the exponent shown in Figure 2. In Hukki's example, …

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Ball Mill Design/Power Calculation

Ball Mill Power Calculation Example #1. A wet grinder ball mill in completed circuit are to be fed 100 TPH of a material with a works index of 15 and a size distribution of 80% passing ¼ per (6350 microns). Of required product body distribution remains to be 80% passing 100 mesh (149 microns). In sort to determine the power requirement, an ...

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Worked Examples Involving Bond039s Equation In Grinding Mills

Авах Worked Examples Involving Bond039s Equation In Grinding Mills Үнэ(WhatsApp) Та мессежээ энд үлдээж болно, бид танд шууд имэйл илгээх болно. ... worked examples involving bond equation in grinding mills . worked examples involving bond equation in Reprinted with ... bonds third ...

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Fine Grinding

the form of Equation (3). The Jar Mill test favoured by gives a table of results of E and measured size x for a progressive batch grinding test; these results can be fitted as demonstrated in Figure 4. A series of Bond ball mill work index tests run at different closing mesh sizes can be fitted in almost the same way.

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Bond Grindability Test Procedure

For the ball mill grindability test, the work index is calculated from the following revised equation (in short tons): where: Pi = sieve size tested (microns) Gpb = ball mill grind ability Wi, P & F have the same meanings as in the top equation. Equipment required: Laboratory ball mill, 34.02 cm x 34.02 cm with following ball charge: Agitator ...

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Equation to calculate grinding mill ball size

My grinding mill has length and diameter of 4.57 m. the maximum size of the balls selected is 77 mm, as there are two or three kinds of ball sizes used..how to select the second ball size. are there any formula or equation that i can calculate the ball size. ... and only minimally dependent on the dimensions of the grinding mills. There are two ...

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CHAPTER 11 SIZE REDUCTION

expressed in appropriate units. In Bond's equation, if L is expressed in microns, this defines E i and Bond calls this the Work Index. The greatest use of these equations is in making comparisons between power requirements for various degrees of reduction. EXAMPLE 11.1. Grinding of sugar

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Compare and Understand Rod/Ball/Impact …

The three tests are: The Bond ball mill work index (Wi BM, or BWi) conducted from a feed size of approximately 2 mm to a product size on the order of 100 µm. The Bond rod mill work index (Wi RM, or RWi) …

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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 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 …

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A Review of Alternative Procedures to the Bond Ball Mill …

The initial sample volume is 207 cm3 instead of 700 cm3; accordingly, the test can be performed on 3 kg instead of 10 kg. The procedure involves dry grinding in a closed …

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Ball Mill Design/Power Calculation

Ball Mill Power Calculation Example #1. 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 80% passing ¼ inch (6350 microns). The required product size distribution is to be 80% passing 100 mesh (149 microns).

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bond index for vertical mill grinding

bond index for vertical mill grinding T10:08:15+00:00 Bond Work Index an overview ScienceDirect Topics. The ball mill work index laboratory test is conducted by grinding an ore sample prepared to passing 336 mm (6 mesh) to product size in the range of 45150 µm (325100 mesh), thus determining the ball mill work index (Wi B or …

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Bond Work Index Formula-Equation

The basic work index equation is: W = 10 Wi/√P – 10 Wi/√F(1) where W is the work input required in kilowatt hours per short ton to grind from 80% passing F microns to 80% passing P …

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Fine Grinding

sizes above, for example, 100 µm. Operators sometimes use Bond's equation to describe grinding in situations where it is not appropriate, such as fine grinding below 50 µm. Using an alternative model would be a better choice in this situation. Bond's equation is one in a large family of models. Related equations better suited to fine