### Bond Work Index an overview ScienceDirect Topics

Ball mill design requires a Bond work index, BWi, for ball mills at the correct passing size; SAG mill design requires an appropriate SAG test, for example, SPI (Chapter 5). Flotation design needs a valid measure of kinetics for each sample, including the maximum attainable recovery and rate constants for each mineral (Chapter 12).

get price### Bond Work Index Report Matrix House

in the design of a grinding circuit. The Work Index is used when determining the size of the mill and grinding power required to produce the required ore throughput in a ball mill. 2. Procedure 2.1. Bond Ball Mill Grindability The sample was crushed to 100% passing 6 mesh (3.35mm), from this a 700 cc volume was measured and weighed to be used as feed for the Bond Mill. A feed particle size

get price### CORRELATION BETWEEN BOND WORK INDEX AND MECHANICAL

the work index depending on the grind size. In this way, work index values are usually obtained for some specific grind size that characterizes the grinding operation to design or under evaluation. This study was carried out in a standard bond ball mill 305 mm x 305 mm size

get price### Correction of Bond Ball Mill Work Index Test for Closing

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 fixed exponent determined by a calibration procedure. The model has the benefit of retaining the variability in hardness that is built into a

get price### COMPARISON OF THE DIFFERENT WAYS OF THE BALL BOND

The methodology for determining the working index of Bond spherical grinding requires about 10 kg of material and the availability of a standardized ball mill. The testing process, depending on a number of conditions (size of the test sieve, homogeneity of material,

get price### The Effect of Circulating Load and Test Sieve Size on The

grindability, on the Bond ball mill grindability (G hg) and work index (W,) are investigated based on four samples of natural amorphous silica. In the experimental studies, the relationships between the Bond work index with circulating load and test sieve size were examined. I INTRODUCTION Currently, silica fume is widely used as a supplementary cementing material to enhance the strength and

get price### (PDF) A quick method for bond work index approximate value

This study aims to develop a new approach toward estimating the Bond ball mill work index (BBWI) by applying a series of kinetic grinding tests with Bond standard mill. Establishing a series of

get price### Ball Mill Design/Power Calculation

The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum ‘chunk size’, product size as P80 and maximum and finally the type of circuit open/closed

get price### Ball Mill Design/Power Calculation LinkedIn

12/12/2016 The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index

get price### Application of Box–Behnken design and response surface

01/01/2007 Fig. 7 shows the effect of ball diameter and Bond work index on product 80% passing size and Fig. 8 shows the effect of grinding time and Bond work index on product 80% passing size. Fig. 9, Fig. 10, Fig. 11 show the 3D response surface plot for middle size fraction (−1700 + 710 μm).

get price### THE EFFECT OF BALL MILL OPERATING PARAMETERS ON MINERAL

new crack tip length produced during breakage. Bond developed the well known Bond work index which is an indicator of a materials resistance to crushing and grinding. Each of these theories was useful in the design and scale up of' ball mill operations, however they told little of the expected size distributions, and most

get price### Testwork: Bond ball mill work index SAGMILLING.COM

Bond models, SGI, Morrell Mi The Bond ball mill work index is one of the most commonly used grindability tests in mining, and is often referred to as the Bond work index. The test is a 'locked-cycle' test where ground product is removed from test cycles and replaced by fresh feed. The test much achieve a steady-state before completion.

get price### Ball Mill Design/Power Calculation LinkedIn

12/12/2016 The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index

get price### Bond Work Index Tests Grinding Solutions Ltd

The Bond Ball Mill Work Index (BBWi) test is carried out in a standardised ball mill with a pre-defined media and ore charge. The Work Index calculated from the testing can be used in the design and analysis of ball mill circuits The test requires a minimum of 10kg of sample that has been stage-crushed to 100% passing size of <3.35 mm.

get price### Studying the effect of ore texture on the Bond Work Index

This investigation showed that the Bond work index increases with an increase in rock strength properties. The maximum difference in the Bond work index for the five tested gold ores was 11% (e.g. Whereas, an average interval between the two-sequence types of

get price### Bond Tests SGS

The test determines the Bond Ball Mill Work Index which is used with Bond’s Third Theory of Comminution to calculate net power requirements*. Various correction factors may have to be applied. W = Wi (10/√P 10/√F) Where W = Net power consumption in kWh/t

get price### GMSG GUIDELINE: DETERMINING THE BOND EFFICIENCY OF

(It is also the Bond ‘design’ Work Index for this circuit.) To avoid the introduction of any designinefficiency factors in the Bond reference standard circuit, assume 8 foot (2.44 m) diameter, overflow mills, and use a rod mill feed size (F80) of 16,000 m and a rod mill µ product size of 1,000 m . Also note µ that in order for no correction factor for ball mill product fineness to apply

get price### Comminution testing JKTech University of Queensland

30/07/2020 The Bond Ball Mill Work Index can be used in the design calculations and simulations using JKSimMet of a new grinding circuit. A Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mill(s) and the associated grinding circuit(s). Sample requirements: A minimum of 8 kg of material crushed to nominally minus 10 mm is preferred. JKTech

get price### AMIT 135: Lesson 7 Ball Mills & Circuits Mining Mill

Ball Mill Design Parameters. Size rated as diameter x length. Feed System . One hopper feed; Diameter 40 100 cm at 30 ° to 60 ° Top of feed hopper at least 1.5 meter above the center line of the mill. Feeder. Single or double helical scoop feeder or a spout feeder; Double helical feeders used in closed-circuit with classifiers; Spout feeders preferred when using a closed-circuit with

get price### Geometallurgical mapping and mine modelling comminution

Colosa deposit providing information critical for mine/mill design and optimisation. In this study, site-based data incorporating 17,505 multi-element assays, 275 QXRD bulk mineralogy measurements, 15,195 EQUOtip rebound hardness values, 9015 sonic velocity measurements, 16,676 density measurements and routine geological logging information from 92 diamond drill holes has been

get price### THE EFFECT OF BALL MILL OPERATING PARAMETERS ON MINERAL

new crack tip length produced during breakage. Bond developed the well known Bond work index which is an indicator of a materials resistance to crushing and grinding. Each of these theories was useful in the design and scale up of' ball mill operations, however they told little of the expected size distributions, and most

get price### CASE STUDIES ON THE EFFECT OF SAMPLE DIMENSIONS ON

The Effect of Grain Size on Ball Mill Work Index The Bond ball mill work index is the most commonly used comminution testwork procedure in the Millpower 2000 database, with more than double the number of results of the second most common (the combined drop-weight test methods). The ball mill work index is defined as “the kW-hr per ton to break from infinite size to 100 µm” (Bond, 1952

get price### Studying the effect of ore texture on the Bond Work Index

This investigation showed that the Bond work index increases with an increase in rock strength properties. The maximum difference in the Bond work index for the five tested gold ores was 11% (e.g. Whereas, an average interval between the two-sequence types of

get price### GMSG GUIDELINE: DETERMINING THE BOND EFFICIENCY OF

(It is also the Bond ‘design’ Work Index for this circuit.) To avoid the introduction of any designinefficiency factors in the Bond reference standard circuit, assume 8 foot (2.44 m) diameter, overflow mills, and use a rod mill feed size (F80) of 16,000 m and a rod mill µ product size of 1,000 m . Also note µ that in order for no correction factor for ball mill product fineness to apply

get price### Comminution testing JKTech University of Queensland

30/07/2020 The Bond Ball Mill Work Index can be used in the design calculations and simulations using JKSimMet of a new grinding circuit. A Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mill(s) and the associated grinding circuit(s). Sample requirements: A minimum of 8 kg of material crushed to nominally minus 10 mm is preferred. JKTech

get price### (PDF) Effect of circulating load and classification

The effect of classification efficiency and circulating load was also investigated by Morrell (2008) who used Bond ball mill tests as the base line (Bond, 1962). Conventional tests (with 100% classifier efficiency) showed that the relative Bond Work Index was reduced by 8%, and hence the grinding efficiency was increased by 8%, when the circulating load was increased from 150% to 400%. By

get price### Investigation of the laboratory conditions effects on the

design of ball mills is important for efficiency of the processing system. The main objective of the ball mills scale-up is either to choose appropriate dimensions of a mill or to predict the resulted effects of implementing changes in its design and operational parameters. Scale-up methods are generally divided into two main groups: 1) the Bond model and 2) the mathematical model based

get price### Geometallurgical estimation of comminution indices for

Figure 9: Correlations to Bond Work Index: (A) Effect of modulus of elasticity of the different studied materials on Bond work index, (B) Effect of compressive strength of the different studied materials on Bond work index, (C) Effect

get price### Circulating load SlideShare

18/11/2014 Test design Slide 12 Main purpose Maximum Capacity Cost low Energy Size Division Less fines Production Bond's work index 13. Test design Slide 13 Effect of circulating load on Bond's work index The follow figures shown variation in the Bond work index with test sieve size as test results[7]. Variation of Bond work index with circulating load. C

get price### Geometallurgical mapping and mine modelling comminution

Colosa deposit providing information critical for mine/mill design and optimisation. In this study, site-based data incorporating 17,505 multi-element assays, 275 QXRD bulk mineralogy measurements, 15,195 EQUOtip rebound hardness values, 9015 sonic velocity measurements, 16,676 density measurements and routine geological logging information from 92 diamond drill holes has been

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