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

The reason for this variation in ball mill work index is because the ore at Mt. Milligan has an intrinsic exponent of –0.45 in the 100 µm to 200 µm size range, not the –0.50 exponent empirically measured by F. Bond. The work index increase between 100 µm and 76 µm is due to a porphyritic grain size that causes a spike in energy

ball mill work index （bond ball mill work index）

Ball Mill Design/Power Calculation

Ball Mill Power/Design Calculation Example #2. In Example it was determined that a 1400 HP wet grinding ball mill was required to grind 100 TPH of material with a Bond Work Index of 15 (guess what mineral type it is) from 80% passing ¼ inch to 80% passing 100 mesh in closed circuit. What is the size of an overflow discharge ball …

JKTech Technical Article

• Grindability as indicated by the bond ball mill work index (BWi) ranged from 10–35 kWh/t, with the majority between 15 and 27 kWh/t. No clear relationships in terms A*b and/or BWi was identified with geological aspects logged from the drill core such as weathering, lithology, alteration, alteration intensity, veining or combinations of these.

JK Bond Ball Mill Test

Since its introduction in the 1960s the Bond Ball Mill Work Index (BBMWi) parameter has been extensively used in predicting ball mill power draw. Along with …

SMC Test® Minerals Processing Comminution Testing

SMC Data Processing. The results from conducting the SMC Test® are used to determine the drop-weight index (DWi) which is a measure of the strength of the rock as well as the comminution indices Mia, Mih and Mic. In conjunction with the Bond ball mill work index they can be used to accurately predict the overall specific energy requirements of ...

Comparison of Ore Hardness Measurements for …

• Bond Ball Mill Work Index (Crushed Feed) • Specific Gravity (part of the SAGDesign test). The results from this work are presented below and are discussed in …

Table of Bond Work Index by Minerals

This Table of Ball Mill Bond Work Index of Minerals is a summary as tested on 'around the world sample'. You can find the SG of each mineral samples on the other …

Determining the Bond Efficiency of industrial grinding …

The metal Bond ball mill is 30.5 cm inside diameter and. 30.5 cm inside length, with rounded corners. It is smooth except for the door hole used for charging. The grinding charge consists of 285 iron or steel balls (43 @ 36.8 mm diameter, 67 @ 29.7 mm diameter, 10 @. 25.4 mm diameter, 71 @ 19.1 mm diameter, and 94 @.

How it Works

SMC Data Processing. The results from conducting the SMC Test® are used to determine the drop-weight index (DWi) which is a measure of the strength of the rock as well as the comminution indices Mia, Mih and Mic. In conjunction with the Bond ball mill work index they can be used to accurately predict the overall specific energy requirements of ...

JKTech Comminution Analyst travels to Santiago to present …

JKTech Comminution Analyst Matt Weier will be travelling to Santiago for Procemin 2018 to present his paper Accuracy of the Bond Ball Mill Test and Its Implications. ... Since first being introduced by F Bond in 1952, the Bond Work Index, derived from the Bond Ball Mill (BBM) Test, is a measure of the resistance of the material to crushing and ...

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 …

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 …

A Statistical Comparison of Bond Ball Mill Grindability …

The result of this testing indicates that the design of the value ball BICO mill of 10.786kWhr/t mill delivers is the root cause of these higher and in less more testing variable reproducible of the BWi same results mean material. than BWi the It value is BICO postulated of ball 12.238kWhr/t mill. that As the well, differing versus the Sepor ...

Bond Work Index Test Ball Mill

The FC Bond Work Index Test Ball Mill was designed by F. C. Bond for use in determining the Bond Index, a measure of grindability and power required for grinding applications. The FC Bond Mills are used in …

Introducing the JK Bond Ball Lite Test (JK BBL)

Introducing the JK Bond Ball Lite Test (JK BBL) - JKTech

A new methodology to obtain a corrected Bond ball mill work index …

Section snippets Material and experimental Bond tests. Samples of dacite and basalt from Serbia, copper ore from a South American meta-sedimentary copper mine, and copper porphyry ore from Canada, of different feed sizes, were used to determine the Bond ball mill work index according to the standard procedure.A standard Bond …

Bond Grindability Index Test Ball Mill

A Bond Ball Mill, 12" x 12" of fabricated construction comes with electric motor and gear reducer drive, digital counter, jogging button to provide positioning of drum for loading and unloading, emergency stop button, 44 ½ lb ball charge, stand and receiving pan. ... Bond Work Index Test Ball Mill. US $ 14,500. Bond Rod Work Index Mill ...

A new approach to the calculation of bond work index for …

A Bond Work index mill ball charge and closing screen product size distributions for grinding crystalline grains. Int. J. Miner. Process., 165 (2017), pp. 8-14, 10.1016/j.minpro.2017.05.011. View PDF View article View in Scopus Google Scholar. Menéndez et al., 2018.

Technical Information

However, if the sample is to be prepared by cutting with a diamond saw (cut-core method) as little as 5kg is normally sufficient. Also remember that the products from the SMC Test® can be re-used for Bond ball work index testing, the SMC Test® being effectively used as a feed preparation step for the Bond ball work index test.

Standard Bond Ball Mill Grindability Test Method-Procedure

Here is the old Allis-Chalmers Bond Work Index Grindability Test Procedure. The standard feed is prepared by stage crushing to all passing a 6 mesh sieve, but finer feed can be used when necessary. It is screen analyzed and packed by shaking in a 1000-cc graduated cylinder, and the weight of 700 cc is placed in the mill and ground …

Testwork variability implications for grinding circuit design

Over seventy Bond Ball Mill Work Index tests of representative splits of quarry material were undertaken by over thirty participating laboratories. To JKTech's knowledge, this …

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 …

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

The goal of this work is to create an equation to adjust a Bond ball mill work index from one P80 basis to another. The proposed model consists of two components, the variable coefficient that is ...

Testwork: Bond ball mill work index

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.

Bond Work Index Formula-Equation

The work index Wi can be determined from plant operations and from laboratory ball mill grindability, rod mill grindability, and impact crushing tests. The laboratory test results are used to check the …

SAG Mill Design and Benchmarking Using Trends in the …

1. K = function dependent on the absence or presence of a pebble crusher. F80 = 80th percentile fresh feed size (mm) Mia = coarse Morrell work index (kWh/t) J = ball load (%) = mill speed (fraction critical) f(Ar) = function of the mill aspect ratio. g(x) = function of the SAG trommel or screen size.

Block diagram of standard Bond test (left) and JK BBL (right

The Bond ball mill work index test has been used for ore hardness characterization for more than 80 years. Nevertheless, the test suffers from significant disadvantages when …

Bond Work Index (Energy equation)

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 (-2.1 mm).

Bond Ball Mill Work Hardness Jktech

JK Bond Ball Mill Test JKTech JK Bond Ball Mill Tes. · tracking mill ... GLOBALLY RELIABLE DETERMINATION OF BOND BALL MILL WORK INDEX JK Bond Ball Mill Test The JKBBM test was developed at the Julius Kruttschnitt Mineral Research Centre JKMRC#8230; WhatsApp: +86 ; PDF Uses and Benefits of …

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

Bond, work index, specific energy, power model. Introduction. Bond's work index model of quantifying mineral grindability was born out of the desire for a beter way of scaling up …

JK Bond Ball Mill Test

Use of Work Index. Along with comminution circuit design the work index parameter is widely used in tracking mill performance. Due to the age and lack of controls for the …

Bond Ball Mill Work Hardness Jktech

can be determined using the data generated by a conventional Bond ball mill work index test (M. ib. is NOT the Bond ball work index). M. ic. and M. ih. values are also provided as a standard output from a SMC Test ® (Morrell, 2009). The general size reduction equation is as follows (Morrell, 2004. b): f x f x 2. 1 i i. 4 2 W M x x. 1 (1) where ...

Comparison of Ore Hardness Measurements for …

standard Bond crushing, and rod mill work indices, abrasion indices and by Dawson for Bond Ball Mill Work Index tests using crushed feed, and Standard Autogenous Grinding Design (SAGDesign) Tests, patented by Outokumpu. (See reference 8 below). The comparison of these results gives context to how the various …

A Comparison of Test Procedures for Estimating the …

particle size are calculated and the Bond ball work index is then calculated using the standard Bond ball work index formula: 𝑊𝑖= 44.5 𝑃0.23·𝑔𝑏𝑝0.82·[10 √𝑃80 · 10 √𝐹80] [2] where W i represents the Bond ball work index, F 80 and P 80 …

Grinding work index according to Bond

The Tovarov grindability index is used to determine the influence of materials on the cement clinker grinding capacity of a mill; the basis is rotary kiln clinker with a defined grindability index of a = 1. According to this, a mill grinding 30 t/h clinker, will grind 30 x 1.40 = 42 t/h of marl or 30 x 0.6 = 18 t/h of silica sand.

JKTech

JK Bond Ball Mill Test; Our flotation ore characterisation test is the JKTech Floatability Index (JKFi) Test. JK Drop Weight Test and SMC Tests® are licenced to 48 metallurgical laboratories globally. To date, over 55,000 JKTech accredited A x b tests have been completed across more than 32 different commodities.