Bond´s work index estimation using non-standard ball mills
The traditional Bond work index proposed by F.C. Bond over 60 years ago is still today a useful tool for characterizing material crushability and grindability in the minerals industry.
Bond Work Index Uses In Gold Processing
Minerals | Free Full-Text | Application of Data Analytics …
This study applies unsupervised and supervised learning to establish relationships between the Bond ball mill work index (BWI) and geomechanical, geophysical and geochemical variables for the Paracatu gold orebody. ... A BWI operational boundary of 14 kWh/t is suitable for the Paracatu processing circuits …
Bond Rod Work Index Mill
Bond Rod Index Mill, 12" x 24" consisting of a one (1) piece cast shell complete with integral wave, 1 Hp 3/60/220 volt motor/gear reducer drive, support frame which allows the mill to tilt +/- 5 degrees during operation and 45 degrees for discharge (manual operation), receiving pan, rod charge and control panel complete with digital revolution counter, …
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 …
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. It does not work well for devices such as the AG ...
Using Rock Geomechanical Characteristics to Estimate Bond Work Index
Therefore, this measure can be cheaply determined using other rock characteristics. In addition, the value of the BWi determines the energy required for crushing and milling (depends on the BWi type, e.g., crushing work index, Bond ball mill work index, and Bond rod mill work index), and this measure can be used to optimize …
Can I use BWi Bond Work Index to Size a Regrind Mill: Fine …
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 situation.
Metals | Free Full-Text | Variability Study of Bond Work Index …
It is a well-known fact that the value of the Bond work index (wi) for a given ore varies along with the grinding size. In this study, a variability bysis is carried out with the Bond standard grindability tests on different critical metal ores (W, Ta), ranging from coarse grinding (rod mills) to fine grinding (ball mills). The relationship between wi and grinding …
Prediction of Bond's work index from field measurable rock …
In general, Bond's work index is used to determine the grinding efficiency and also to calculate the power requirement. The process is very time consuming and it requires skilled labor and specialized mill. A systematic investigation was carried out to predict Bond's work index using simple field measurable properties of rocks.
Bond Rod Mill Work Index Equipment & Apparatus Review
Commentary on the apparatus of the Bond rod mill Work Index. by Alex Doll December, 2015 [email protected]. The Bond "Third Theory" of comminution was originally divided into three size classes reflecting the varieties of comminution equipment common during the time period when Bond (and his collaborators) were …
Studying the effect of ore texture on the Bond Work …
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 the tested ore was approximately 2.5%. (e.g. ).
Procedure for determination of ball Bond work index in …
A Bond Ball Mill Work Index test is a standard test for determining the ball mill work index of a sample of ore. It was developed by Fred Bond in 1952 and modified in 1961 (JKMRC CO., 2006). This index is widely used in the mineral industry for comparing the resistance of different materials to ball milling, for estimating the energy required ...
Work Index and Sample Size
The answer to this question is that generally no, the size that the index is measured at does not effect the Bond work index value. Bond work index (BW i) is a measure of the hardness of an ore. This is a quality of the rock, which generally does not change over the size ranges encountered in ball milling.
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 …
The extractive metallurgy of South Africa's platinum ores
Bond work indices are 18 kwhr/t at 300 microns and 21 kwhr/t at 200 mesh. Plat Reef ores are similar to the Merensky ores in many ways but various geological
Comminution | SpringerLink
6.4.1 Bond Work Index. One of the most commonly used breakage characterization methods in the mining and mineral industries is the Bond work index method, based on the so-called "Third ... (SMD) in gold processing. 38th Annual Meeting of the Canadian Mineral Processors Ottawa, Canada (2006)
Procedure for determination of ball Bond work index in the …
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 …
Table of Bond Work Index
The later values from 's "Basics in Mineral Processing 2015" (Bond worked for All-Chalmers, which is now ) gives the value for basalt as 17.10. All kwh/st. For a particular application or project to size a mill circuit it would be prudent to have the Work Index (also for abrasion or crushing) determined at a mineral processing laboratory.
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 …
A new approach to the calculation of bond work index for …
Semantic Scholar extracted view of "A new approach to the calculation of bond work index for finer samples" by Vladimir Nikolić et al. ... The grindability of an ore in the process of mineral dressing can be determined by use of the Bond work index (Wi). This index is determined on a laboratory scale using a Bond ballmill and by …
BOND'S WORK INDEX: WHAT IT IS AND WHAT IT ISN'T
Understanding where the work index fits into the family of power-based grinding metrics will help operators correctly apply the work index and avoid making mistakes.
Bond Work Index
The Bond work index (Bond, 1960) is based on Bond's law, which states that the energy consumed is proportional to the 1.5 power of particle size rather than the square of …
Determination of the Bond work index of binary mixtures by different
Section snippets Apparatus and methods. Traditional Bond ball mill (Ø305 × 305 mm) and Hardgrove mill were used for the measurements.The traditional Hardgrove Grindability Index (HGI) was determined by using the following equation: HGI = 13 + 6.93 m P where m P means the mass of product particles finer 75 μm in grams. From this …
Secrets of the Bond Ball mill grindability test
ABSTRACT The Bond ball mill grindability test is one of the most common metrics used in the mining industry for ore hardness measurements. The test is an important part of the …
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 ...
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 industry standard, Bond did not fully define that procedure, and therefore significant discrepancies in test results can sometimes be …
(PDF) STUDYING THE EFFECT OF ORE TEXTURE ON THE BOND WORK INDEX …
The maximum difference in the Bond work index for the five tested gold ores was 11% (e.g. (20,4 kWh/ton – 18.2 kWh/ton)/(20,4 kWh/ ton) × 100 11 %). ... Grinding process; Bond W ork index; gold ...
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 …
Bond Work Index Formula-Equation
The basic work index equation is: W = 10 Wi/√P – 10 Wi/√F………………………………………………………………………… (1) where W is the …
DETERMINATION OF THE WORK INDEX ON A GOLD ORE
In his Third Theory of Comminution, F. C. Bond states that W, the work input in kwh/ short ton is equal to W. /10 - 10 where Wwri5 i = the V work index. The work index is the …
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