(PDF) Variability Study of Bond Work Index and Grindability 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 ...
A procedure for rapid determination of the Bond work index
The grindability of an ore in the process of mineral dressing can be determined by use of the Bond work index (W i).This index is determined on a laboratory-scale using a Bond ball-mill and by simulating dry grinding in a closed circuit until the 250% circulating load has been obtained.
Rapid determination of Bond rod-mill work index by …
The grinding experiments were carried out on four typical samples of iron, copper, manganese and lead–zinc ore with three test-sieves in specified time periods and aimed to shortening the procedure. ... The objective of this study was to conduct a rapid determination of Bond work index by considering grinding kinetics of the particles in ...
EFFECT OF OPERATING VARIABLES ON BOND'S WORK INDICES DETERMINATION
The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test. Its value constitutes ore characteristic and is used for industrial ...
Rapid determination of Bond rod-mill work index by …
To calculate Bond rod-mill work indices, the four samples were screened and the particle size distributions plotted in Fig. 2.The plot was used to find F 80 of the samples for calculations. Fig. 3, Fig. 4 show the grinding kinetics of Pb, Cu, Fe, and Mn ores in the Bond rod-mill in different test-sieves. The slopes of all lines in the figures are equal to …
Procedure for determination of ball Bond work index in the …
TL;DR: In this paper, the authors used the calculated retention time of the iron ores as a standard grinding reference time to the laboratory ball mill for optimizing the grinding time of each ore, and obtained a desired P80 (150μm) with an acceptable range of hematite liberation (> 75%) after reducing 6min from the total retention time taken in the Bond …
Comparison of the Different Ways of the Ball Bond Work Index
When designing concentrating plants, the selection of the technological comminution scheme for beneficiation, the type, quantity and size of the equipment, the determination of optimal grinding regimes and the calculation of equipment loads are carried out by preliminary studies of grinding in semi-industrial or laboratory conditions. …
Determination of Work Index of Muro Iron Ore Using …
The work index of Muro iron ore was determined using the modified Bond's method also known as Berry and Bruce method. This study used iron ore obtained from Muro town, a community in Toto LGA, Nasarawa state as the test ore. ... Nasarawa state. 70 kg samples of Procedures for Determination of Bond Work the iron ore were collected with the aid ...
Using Rock Geomechanical Characteristics to Estimate Bond …
A Bond rod mill work index test (BRMWI) is a standard test for determining the rod mill work index of an ore sample [21]. The BRMWI is a measure of the …
The bond work index of mixtures of ceramic raw materials
The Bond method of grindability was applied to ceramic raw materials (quartz, kaolin and feldspar) and to their binary and ternary mixtures. The Bond work indices of the admixtures containing a softer component (kaolin) were found to be greater than the weighted average of the work indices of the individual components in the …
Development of process for beneficiation of low-grade …
work, the test sieve used for the determination of the Bond work index was 75 µm for close size parameter. The ball mill size was 305 × 305 mm, the speed was 70 rpm, and …
A new approach to the calculation of bond work index
The ore resistance to grinding and energy consumption can be expressed using the work index and Bond's Third Theory. The Bond Third Theory method is widely used in the design of the grinding cycle, selection of grinding equipment, determination of required grinding power, and performance evaluation of the process. ... This paper …
[PDF] Determination of Bond Work Index of Lucky Cement …
The Bond work index is a research methodology, which is widely used for the estimation of power required to grind the materials. Keeping in view the difficulty in determining this index, many alternatives to the standard method have been explored by the different researchers. The study is focused on comminuting behavior of limestone and calculation …
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 …
Work Index
The self-grinding work index is an extension of the concept of Bond work index. It generally refers to the work index calculated by using Bond's fracture theory …
Characterization and Bond Work Index Determination of …
Bond work index and the consumed energy [6]. Berry and Bruce (1966) discovered new method for determining the work index, the concept of this method depended on the …
Determination of Bond index of Birnin-Gwari Iron Ore in …
The Bond's equation was then used to calculate the work index of the Muro iron ore which was found to be 24.84 kWh/ t when marble was used as reference ore and 27.41 kWh/ t when granite was used ...
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
(PDF) Variability Study of Bond Work Index and …
Abstract and Figures. 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 ...
Procedure for determination of ball Bond work index in the …
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 …
DETERMINATION OF THE BOND'S WORK INDEX OF …
determination of the work index of BirninGwari iron ore in Nigeria. - A reference ore is ground for a certain time period and the power consumption recorded. An identical weight of the test ore is then ground for a length of time such that the power consumed is identical with that of the reference ore. Equation 1 gives the work index of the ...
Determination of Bond index of Birnin- Gwari Iron Ore …
Bond work index of Birnin- Gwari iron ore in northern Nigeria is determined using modified Bond's method using 'reference ore'. Samples of iron ore were sourced using random method, ... The determination of work index using modified Bond's method can be compared to method of determining it by Berry and Bruce (1966). This method requires ...
Work index evaluation of Rayfield-Jos columbite mineral for …
Mineral ore Work index Mineral ore Work index; Barite: 4.28 – 6.24: Graphite: 1.75 – 45.03: Bauxite: 2.38 – 9.45: ... Characterization of Chemical Composition and Microstructure of Natural Iron Ore from Muko Deposits, ISRN Materials Science (2012) 2012:9. ... Summary and determination of Bond Work Index using an Ordinary …
Rapid determination of Bond rod-mill work index by …
Generally, Bond work index is a common method for selecting comminution equipment as well as estimation of grinding efficiency and calculating required power.
Prediction of Bond's work index from field measurable rock …
DOI: 10.1016/J.MINPRO.2016.10.006 Corpus ID: 99402495; Prediction of Bond's work index from field measurable rock properties @article{Chandar2016PredictionOB, title={Prediction of Bond's work index from field measurable rock properties}, author={Karra Ram Chandar and S. N. Deo and Ashwin J. Baliga}, journal={International …
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 the resistance of material to ...
Determination of Bond index of Birnin- Gwari Iron Ore in …
Bond index is useful in designing of grinding system in mineral processing. In this study, the Bond work index of Birnin- Gwari iron ore in northern Nigeria is determined using modified Bond's method using 'reference ore'. Samples of iron ore were sourced using random method, reference minerals; marble and granite of known weight and iron ore …
Bond Work Index Procedure and Method
Preparation of Test Feed Sample for Bond Work Index Procedure: Riffle 8-10 kilograms of minus half an inch feed into 500 …
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 = …
Characterization and Bond Work Index Determination …
The Bond Work Index of a material is defined as the required ... accomplished on determination of the work index to iron ore from different countries[11]. Recently,several attempts were