FC Bond Mill

grams per revolution (Gbp) is the ball mill grindability. The ball mill work index, Wi (kWh/short ton) is calculated from the following equation (Bond 1961):1 The mill should be cleaned by either blowing air into it or wiping the interior with a cloth and or brush. The FC Bond ball mill is now ready for the next sample.

Bond Work Index to Measure Comminution Efficiency

EF8 Rod Milling: this allows for changes in mill performance as the rods and mill liners wear from a new charge and liners to a worn-in charge and liners. These Efficiency Factors can be applied to the power per ton as calculated using the Bond Equation, or to the work index from crushing and grinding tests or to the operating work index.

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

the Bond Work Index (kWh/t) can be rapidly estimated (less than 2 hours) and show a high accuracy for mills of non-standard dimensions (R2= 0.96). Keywords: Bond´s Work Index, …

A quick method for Bond work index approximate value …

The aim of this study was to develop a new method for assessing the Bond work index in a ball mill (BBWI), which is based on a first order kinetics present in the Bond ball mill for grinding mineral raw materials (Austin et al., 1981; Ahmadi and Shahsavari, 2009). Theoretical basis of quick procedure Grinding of various mineral raw materials in ...

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.

A new approach to the calculation of bond work index

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 …

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

Bond's work index is one of the mostly widely used metrics of mineral grindability. In spite of its ubiquity, users are often not aware of the nuances of the work index family: what are its …

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 ...

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 microns, and Wi is the work index, or the grinding resistance parameter. It represents the energy input required in kilowatt hours to …

Using the Bond work index to measure operating comminution …

Bond work index; Grinding; Crushing; Ball mills; Rod Mills; Use our pre-submission checklist. Avoid common mistakes on your manuscript. Advertisement. Search. Search by keyword or author. Search. Navigation. Find a journal Publish with us Track your research Discover content ...

Determination of work index in a common laboratory …

Bond work index determination: Tests were carried out at a product size of 200 [.tm, repeating each one three times. The final results of the test are shown in Table 2 with the work index calculated using Eq. (2). Denver grinding tests. The tests carried out in the Denver mill follow the Bond methodology but were performed with

BOND'S WORK INDEX: WHAT IT IS AND WHAT IT …

It is commonly known that one must run the Bond ball mill work index test such you pick a closing mesh to give a P 80 close to desired grind size. This is because work index frequently changes as ...

(PDF) COMPARISON OF THE DIFFERENT WAYS OF THE BALL BOND WORK INDEX …

The essence of this work [26] is to assess the Bond grinding work index by means of classical tests for determining the parameters of grinding kinetics according to the grinding duration of 0.33, 1, 2, 4 and 8 minutes for all size classes in the same mill and under the same conditions of grinding as in the standard Bond test.

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.

A Bond Work index mill ball charge and closing screen …

Results of 30 Bond Work index tests of six pure materials (calcite, magnesite, labradorite (feldspar), quartz, andalusite and glass) using closing screen apertures (P 1) values of 500, 250, 125, 90 and 63 μm are analysed. The samples were selected on the basis of having distinct hardness's (Mohs hardness 3 to 7.5), being relatively free of crystallographic defects …

Methods for Estimating the Bond Work Index for Ball Mills

Bond work index results in different mills with different ball charges [14]. Mill Ball Charge BWI (kWh/t) Mill 1. Charge 1 12.50. Charge 2 12.33. Charge 3 11.77. Charge 4 11.82. Mill 2. Charge 1 ...

Grinding Bulletin #5 – Metcom Technologies

Another bulletin will describe how Bond used it to prescribe mill power requirements for new projects by measuring the Work Index of the ore, and subsequently how to use it to calculate …

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(PDF) COMPARISON OF THE DIFFERENT WAYS OF THE BALL BOND WORK INDEX …

Aspects in mining & mineral science, 2022. Research was performed to make an objective comparison of Bond Ball Mill Grindability Work Index results derived from using two commercial testing apparatus, from BICO and Sepor respectively, each with a different mill shell design.

Variability Study of Bond Work Index and Grindability Index on Various

T rumic, M.; Men é ndez-Aguado, J.M. Determination of Bond work index in non-standard mills. In Proceedings of the. XIV International Mineral Processing and Recycling Conference (2021 IMPRO ...

Compare and Understand Rod/Ball/Impact …

The Bond rod mill work index (Wi RM, or RWi) conducted from a feed size of approximately 10 mm to a product size on the order of 1 mm. The Bond crushing (impact) work index (Wi C, CWi, LEIT or IWi) conducted on …

Correction of Bond Ball Mill Work Index Test for Closing …

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. This is because work index …

Testwork: Bond ball mill work index

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 …

Correction of Bond Ball Mill Work Index Test for …

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.

(PDF) Alternative Methods to Bond Ball Mill Test

The Bond work index can be estimated from the Hardgrove index using Equation (22): wi,H = 435 H 0.82 (22) The Hardgrove index is based on fine products for a given number of revolutions, and the Bond work index is based on the mass of a fine product multiplied by the number of revolutions of the mill.

Determination of work index in a common laboratory mill …

An analysis of the results shows a direct relationship between the Bond work index and the Denver work index when the Bond test is defined adequately to the Denver lab mill. Comparison of results ...

Determination of the Bond work index on samples of non …

The Bond work index, W i, is defined in a Bond ball mill on the samples of standard size −3.327 + 0 mm. In practice, it is possible to find materials of non-standard size that are finer than 3.327 mm. In this work, a procedure for the calculation of

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

The results showed that using the non-standard mills (between 20 and 35 cm in diameter), the Bond´s model constants (α=0.23; β= 0.82, and γ = 44.5), are unable to predict …

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 is included with each mill.

Guia de determinação do work index de moinho de bolas

The work index (WI) is a method used to forecast the energy consumption in the ore comminution and make it possible to scale up. This work aims to present the methodology for determining the work index by the ball-mill test through Bond's theory in view of the dissemination of this analysis methodology for industrial processes.

Methods for Estimating the Bond Work Index for Ball Mills

A Bond Work index mill ball charge and closing screen product size distributions for grinding crystalline grains. Int. J. Miner. Process. 2017, 165, 8–14. [Google Scholar] Menéndez, M.; Sierra, M.H.; Gent, M.; De Cos Juez, F.J. The comminution energy-size reduction of the Bond Mill and its relation to Vickers Hardness.

A New Approach to the Calculation of Bond Work Index …

Bond Work index is also related to the filling rate of the mill, and the conventional Bond Work index mill in the steel ball filling rate is 20%. When the ceramic balls as grinding media are in the same 20% filling rate under the experimental calculation of the Bond Work index are much larger than the conventional steel balls after the grinding ...

Commentary on the apparatus of the Bond rod mill …

The specification for the apparatus to determining a "Bond" rod mill work index is first described in Bond & Maxson (1943). It states that the apparatus is a tumbling rod mill to be operated in a locked cycle test at a fixed circulating load. The geometry of the grinding chamber is described as: • mill inside diameter of 12 inches

Bond Impact Crushing Work Index -Procedure

Sizing a crusher can be done reliably calculated thanks to the Impact/Crushing Work Index and the testwork research done by Fred Chester Bond and his 1952 paper. According to Bond's Third Theory of Comminution, the work/energy input is proportional to the new crack tip length created during particle breakage and equivalent to the work represented by the product …

CORRELATION BETWEEN BOND WORK INDEX AND …

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 80% passing 100 µm. If the breakage

Bond Work Index Report Matrix House

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 as feed for the Bond Mill.