bond work index ball mill calculation pdf design and safety factors

C.A. Rowland

ball mills had diameters in the range of3.20 to 3.51 m (l0.5 to 11.5 ft.). However, during the 1960s, the diameters of the mills increased to 4.57 m (15 ft) for rod mills and 5.03 m (16.5 ft) for ball mills. In addition, the diameters of the ball mills that were being designed at that time were 5.5 m (18 ft). It was also

The Bond work index – so crucial to comminution planning

The Bond Work Index approach is the standard method of selecting ball mills to grind from about 3 mm to 25 µm provided that correction factors are used if necessary. The power prediction is fairly accurate for devices that produce a product with a size distribution parallel to that of the feed.

Secrets of the Bond Ball mill grindability test

feed size distribution is different to a standard Bond ball mill work index test. A series of 10 samples for an Andean copper project were treated to both the SAGDesign (and Sd_bwi) test and the standard Bond ball mill work index test with 180 µm closing screens. The SAGDesign results (with the non-standard ball mill feed) are given in Table 1.

Calculate and Select Ball Mill Ball Size for Optimum Grinding

In Grinding, selecting (calculate) the correct or optimum ball size that allows for the best and optimum/ideal or target grind size to be achieved by your ball mill is an important thing for a Mineral Processing Engineer AKA Metallurgist to do. Often, the ball used in ball mills is oversize "just in case". Well, this safety factor ... title="Calculate …

A meaningful expression between bond work index, grindability index …

The tested rock sample of a 500 g aggregate in the fraction 11.2–16.0 mm was inserted into the mortar.The friability value S 7 equals the percentage of undersized material, which passes through the 11.2 mm mesh after the aggregate test crushing in the mortar by weight-drops, the mean value for a minimum of three to four parallel tests …

(PDF) EFFECT OF OPERATING VARIABLES ON BOND'S WORK …

Bond's work index determination, since its inception in 1952, is being used to estimate the power required for milling, sizing of mills and calculation of milling circuit efficiency.

bond work index ball mill calculation pdf design and safety factors

QUICK METHOD FOR BOND WORK INDEXAPPROXIMATE The aim of this study was to develop a new method for assessing the Bond work index in a ball mill (BBWI), which i. bond work index ball mill calculation pdf design and safety factors T18:10:40+00:00

bond work index ball mill calculation pdf design and safety factors

Grinding Mill|Ball mill working principle|Ball properties of ores include the Bond ball mill work index and the bond work index determination with a sepor batch ball mill Bond Work Index Determination With A Sepor Batch Ball Mill. the be of and a . 67842 work 67219 become 67198 more 66999 old

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.

Table of Bond Work Index by Minerals

Source 1: Table of materials reported by Fred Bond Source 2: Outokumpu, The science of comminution Source 3: Equipment and pipelines Source 4: Tenova Bateman mills (AG/SAG, Rod, Ball Mill) Source 5: Doering international

AG – Autogenous & SAG Semi-Autogenous Mill Design Calculations

Figure 3a and 3b gives the results of the computer calculation. The mill power at the pinionshaft for a 30% volume charge is the sum of: Figures 3a & 3b give the power for an autogenous mill. Figures 4a and 4b are for the same size mill with a ball charge of 6% of mill volume (290 lbs. per cubic foot).

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 …

Procedure for determination of ball Bond work index in the …

The Bond ball mill grindability test is run in a laboratory until a circulating load of 250% is developed. It provides the Bond Ball Mill Work Index which expresses …

AMIT 135: Lesson 7 Ball Mills & Circuits – Mining …

Describe different types of ball mill design. Describe the components of ball mill. ... Work Index. Bond estimated the amount of wear in terms of kilograms per kWh based on the abrasion index, A;, i.e., ... Calculate …

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 Review of Alternative Procedures to the Bond Ball Mill …

Determining the Bond index using the Fred Bond method [1,2] is considered the state-of-the-art methodology for mill calculations and a critical process parameter in raw materials selection and grinding process control.Although it is usually referred to as a standard test, no ISO (International Organization for Standardization) or ASTM …

Calculate a Mill's Operating Work Index

A) Total Apparent Volumetric Charge Filling – including balls and excess slurry on top of the ball charge, plus the interstitial voids in between the balls – expressed as a percentage of the net internal mill volume (inside liners). B) Overflow Discharge Mills operating at low ball fillings – slurry may accumulate on top of the ball charge; causing, …

Rod Mill Design Calculations

EF5 Fine Grinding in ball mills to product sizes finer than 80% passing 200 mesh (75 micrometers). EF6 High or low ratio of reduction rod milling. EF7 Low Ratio of reduction ball milling. EF8 Rod Milling. Example Rod Mill Design Calculations. Rod Mills. F = 18,000 micrometers. P = 1,200 micrometers. Wf = 13.2

Bond´s work index estimation using non-standard ball …

Fig. 2(a-d) shows the ball mills used in the determination of the Work Index (standard mill BBM and non-standard mills BM-1 to BM-3, all ball mills without lifters). Bond standard ball mill (Fig 2(a);

MODULE #5: FUNCTIONAL PERFOMANCE OF BALL …

In the prerequisite module entitled "Work Index Efficiency", you have learned about work index analysis* to define overall grinding circuit efficiency. In rod milling, you can use work index analysis to relate design and operating variables to overall circuit efficiency. However, you cannot use work index analysis for the same purpose on ball mill

Bond Work Index Formula-Equation

Bond Impact Crushing Work Index -Procedure and Table of Crushability

The test determines the Bond Impact Work Index which is used with Bond's Third Theory of Comminution to calculate net power requirements when sizing crushers*. It is also used to determine the required open-side settings (jaw crushers and gyratory crushers) or closed-side settings (cone crushers) for a given product size.P80 = …

Procedure for determination of ball Bond work index in …

The Bond ball mill grindability test is run in a laboratory until a circulating load of 250% is developed. It provides the Bond Ball Mill Work Index which expresses the resistance of material to ball milling.This happens after 7–10 grinding cycles, which shows that the procedure is a lengthy and complex one and is therefore susceptible to …

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

The " Y " component is given in Eq. (12) and includes the same exponent of −0.82 on the G term as is observed in the Bond ball mill grindability Eq. (10).The exponent was empirically tested against the database and found to be robust. A "raw" work index is an uncorrected work index computed using Eq.

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 …

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 …

A New Approach to the Calculation of Bond Work Index …

Based on the results obtained, the Bond Work index of ceramic balls and steel balls can be calculated as follows: W = W − 0.5 ⋅ n + 2.5. cn i. (3) where in: Wcn - BWi for ceramic …

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 laboratories throughout the world. A copy of Fred C. Bond's Method of Crushing and Grinding for determination of the Bond Index …

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 passing 6 mesh (3.35mm), from this a 700 cc volume was measured and weighed to be used ...

Bond´s work index estimation using non-standard ball mills …

The Bond Work Index (Wi) is a common technique for the estimation of hardness and energy requirement for comminution using ball mills. However, this technique is time-consuming (close to 5 hours ...