Characterization and Comminution Studies of Low-Grade Indian Iron …
A higher Bond work index value was found for the BHJ ore (15.4 kWh/ton) than for the BHQ ore (12.4 kWh/ton). A decrease in the product particle size was associated with an increase in the work index value. Single-particle breakage experiments were designed by varying feed particle size and input energy.
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
Rapid determination of Bond rod-mill work index by …
To calculate the Bond work index ( Wi) in a standard laboratory scale rod-mill, Bond derived the following equation: (1) W i = 62 P i 0.23 G i 0.625 10 P - 10 F kw h sh t where F is 80% passing size of original feed, P is 80% passing size of circuit product and Pi is the test-sieve size in μm [1]. The standard procedure to determine all Bond ...
(PDF) Determination of Work Index of Gyel-Bukuru Columbite Ore …
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 ...
Article Determination of Work Index of Muro Iron Ore …
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 as reference
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 ball …
Procedure for determination of ball Bond work index in …
1.. IntroductionA 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 …
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 table. Source 1. Source 2. Source 3. Source 3. Source 4.
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 …
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 ...
Estimation of Grinding Time for Desired Particle Size
A bench test was developed for dry grinding to determine the Bond work index and to know the PSD and hematite liberation in all the three iron ore product samples obtained from the BBM. For each iron ore sample, 700 cc of feed was weighed and added into the BBM. The BBM was set for 100 revolutions in the first iteration.
Characterization and Bond Work Index …
The bond work index test obtained high work index 52.60 kw.h/t and consumed power 11.72 kw.h/t to grind one ton of low grade iron ore and this attributed to the high concentration and hardness of quartz mineral …
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 …
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 ...
(PDF) Determination of Work Index of Muro Iron Ore …
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 Abrasion Index for Varied Minerals-Materials
The Bond Abrasion Test determines the Abrasion Index, which is used to determine steel media and liner wear in crushers, rod mills, and ball mills. Bond developed the following correlations based on the wear rate in pounds of metal wear/kWh of energy used in the comminution process. Determining rock abrasivity in the laboratory ref
Determination of the Bond work index on samples of non …
The Bond work index, Wi, 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 the Bond work index is suggested for cases when the Bond grindability test is conducted on ...
Rapid determination of Bond rod-mill work index by …
Tavares et al. (2012) and Ahmadi et al. (2013) then used this same model and a batch test as an alternative to the standard Bond rod mill test to estimate the Bond rod work index. Grandy and ...
Gives the work index of some minerals ores samples.
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 ...
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 in …
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 of known weight were ground using the laboratory ball mill grinding ...
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 …
Characterization and Bond Work Index Determination …
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 use of a reference ore of known work index[7]. Iron ore is one of the important industrial minerals used in steel industrials. Magnetite, hematite and goethite are considered the ...
Determination of Bond index of Birnin- Gwari Iron Ore …
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 the use of a reference ore of
Comparison of the Different Ways of the Ball Bond Work Index
D. Todorović Maja Trumić L. Andric V. Milošević Milan Trumić. Engineering, Materials Science. 2016. 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….
Using Rock Geomechanical Characteristics to Estimate Bond …
The Bond low-energy impact test, also named impact work index or Bond impact crushing work index, can measure the crushing work index (CWI) and describes …
Procedure for determination of ball Bond work index in
Fig. 1 (a) shows the ore used in the determination of the Work Index with the standard methodology (Bond, 1961), the reduced methodology (Ahmadi et al., 2009), and with the use of standard 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 mesh or finer feed ore samples. These equation application methods are used to process <1/2″ ore samples in a Ball Mill using …
High Pressure Grinding Roll and Magnetic Separation for
Bond work index is an index to evaluate the difficulty of ore grinding. The theoretical basis of Bond work index to measure ore grindability is Bond's ore crushing crack theory [24,25,26]. According to the standard Bond test requirements, the bond work index test of raw materials and pre-enriched adopted a Φ305 × 305 mm standard work …
Metals | Free Full-Text | Variability Study of Bond …
The Bond work index most commonly referred to is the BBM work index. This value is obtained in a 12" × 12" laboratory mill running at 70 rpm, with rounded inner edges and without lifters. The grinding …