Procedure for determination of ball Bond work index in …
Based on the defined first-order grinding kinetics in the Bond ball mill, a procedure has been developed for the rapid determination of the work index (Wi) by means of just two grinding tests. The applicability of the proposed abbreviated procedure has been proved on samples of copper and iron ore. The differences between the values of the …
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Bond Impact Crushing Work Index -Procedure …
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 …
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Procedure for determination of ball Bond work index in
Bond testing is a standard part of ore characterization for comminution circuits design and evaluation of performance. Bond Work Index (BWI) is usually understood as an ore grindability parameter ...
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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. ... for the higher iron mattes. ... PW Overbeek and LB McRae. The recovery of platinum-group metals from ore of. the UG-2 ...
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Bond Work Index (Energy equation)
BOND WORK INDEX. The Bond Work Index is a factor that measures the energy consumed in size reduction operation of the ore. The Bond's Work Index equation is: W=WI* (10/√P80 -10/√F80) where. W= the energy input (Work input) per ton, kwh/metric ton. WI= Work Index= specific energy per ton, kwh/metric ton (characterizes the ore)
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Characterization and Bond Work Index Determination of …
The ore is low grade containing 41.41 % Fe2O3 and 50.88 SiO2. 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 which is considered the main gangue of the ore in study area .
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Bond Work Index
The measured BW i was 14.0 and 6.6 kWh/t for the medium/hard and soft ore, respectively, at a closing screen size of 106 μm compared with the simulated values of 13.2 and 5.6 …
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Investigation of iron ores based on the bond grindability test
The result shows that the maximum Bond work index of 14 KWh/mt was obtained for 'A' type iron ore sample. The Bond work index for 'B' and 'C' type iron ore sample are of 11 and 10 KWh/mt.
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Using Rock Geomechanical Characteristics to Estimate Bond …
Bond ball mill work index (BBMWI) test is a standard test used to measure the ball mill work, which is calculated in accordance with the procedure …
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Mineralogy, Microstructure, and Chemical Composition of …
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 ...
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Tumbler Index
The Tumbler Index and Aibrasion Index are determined in a tumbler test apparatus as per the Bureau of Indian Standard No. IS:6495 . The Tumbler Index is a relative measure of the resistance of the material to breakage or degradation by impact. (ii) Abrasion Index: It is a relative measure the degradation of iron ore by abrasion.
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Characterization and Comminution Studies of Low-Grade …
Bond work index studies were carried out for the BHQ and BHJ ores with different product fineness in order to evaluate the energy requirements in fine grinding. 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). See more
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Table of Bond Abrasion Index for Varied …
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 …
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Rod Mill Work Index Table
Here is a list presented in table form of Rod Mill Work Index as tested/presented by SME handbook of mineral processing, N.L Weiss Editor, N.Y. 1985. Rapid Determination of Bond Rod-mill Work Index by Craig Taylor on Scribd . ... Iron ore, unidentified: 11.3: 3-20: 54: Hematite: 12.5: 5-22: 64: Conc: Specularite: Limonite: 9.3: 4 …
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Effect of magnetite content on Bond work index and
Grinding is one of the most costly operations in the mechanical breaking and mining. Determination of the breakage characteristics and preconditioning is important to increase the grinding efficiency. Investigations of the seismic, mechanical and breakage properties of iron oxides are very important parameters for investigating the rock …
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Work Index | SpringerLink
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 on the principle of ore crushing energy consumption according to the W, F, and P data of a small or semi-industrial or industrial self-grinding test. In this kind of test, McPherson …
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A meaningful expression between bond work index, grindability index …
A linear relationship between grindability index, G, and friability value was found as given in Eq. (2). The correlation coefficient is very high, at 0.99. (2) G = 0. 171 + 0. 021 (S 20) The relationship between friability value (S 20) and Bond work index (W i) also has a high correlation of 0.97 and this relationship is given in Eq. (3). (3) W ...
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India plans to tweak iron ore sale price formula -document …
NEW DELHI, Dec 4 (Reuters) - India plans to tweak a formula to fix the average domestic sale price of iron ore, a key steelmaking raw material, according to a government note reviewed by Reuters ...
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Investigation of iron ores based on the bond grindability test
The present investigation involves the identify the physical properties of three different types of iron ores by using Bond ball mill. The result shows that the maximum …
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(PDF) Variability Study of Bond Work Index and Grindability Index …
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 ...
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Article Variability Study of Bond Work Index and …
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 charge is comprised of …
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(PDF) EFFECT OF OPERATING VARIABLES ON …
work index test conducted on iron ore sample using laboratory ball mill runs at 70 pm and the observed 9.25 kWh/t. T able 2 gives the test conditions for various grinding media viz., ball,...
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Chemical analysis of iron ore samples. | Download Table
An iron ore concentrate assayed 64.5% Fe, 5.6% SiO 2 and 0.80% Al 2 O 3 with wt% recovery of 23.2% can be obtained from two stage tabling. Another concentrate from magnetic separation of table ...
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Investigation on Iron Ore Grinding based on Particle Size
The feed samples of X, Y, and Z iron ores were ground in the BBM (ball mill refers to a BBM of size 300 mm × 300 mm with smooth liners) to identify the PSD, BWI, and RT of each ore. Grinding experiments were conducted according to Bond's standard test procedure [].For each iron ore sample, the RT taken to produce 250% circulating load in …
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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.
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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. ... devised an approximate procedure comparing the grindability data of an unknown ore with a reference ore whose grindability data are known and determined in a …
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Bond Work Index of a Low Grade Iron Ore & Flocculation …
Bond index is useful in designing of grinding system in mineral processing. In this study, the Bond work index of a low grade iron ore is determined using modified Bond's method. Samples of iron ore were sourced using random method. Iron ore of known weight were ground using the laboratory ball mill grinding machine. 80% passing size for the iron ore …
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(PDF) EFFECT OF OPERATING VARIABLES ON BOND'S WORK …
India. The sample was ... work index test conducted on iron ore sample using laboratory ball mill runs at 70 pm and the observed 9.25 ... The Bond work index is a measure of ore resistance to ...
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The Bond work index – so crucial to comminution planning
Fred Bond is being inducted into the International Mining Technology Hall of Fame in the comminution category for 2015. The word Bond is synonymous with grinding circuit design, e.g. Bond Grindability and Bond Work Index. Fred Bond's work on circuit design occurred from the late 1930s to the mid 1960s and it changed the method of …
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Relationship between the Bond work index (w i ) …
Download Table | Relationship between the Bond work index (w i ) and the ore hardness designated by Denver from publication: Modelling the specific grinding energy and ball mill scale-up india ...
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