What Do Bond Mill Work Index Tell You

measurement that can be correlated with Full Bond Ball Mill work index (BMWi) in a given . ore body, as shown in Figure 2.11. In contrast to a full Bond Ball test which requires about 5 kg .

Standard Bond tests showed a reduction in the Bond ball mill work index (wi) of the mineral sample used in this study when using Relo grinding media. The modified Bond test procedure is based on using the standard Bond ball work index test but changing the circulating loads (350%, 250%, 150%, ).

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 [Bond 1961].

• Grindability as indicated by the bond ball mill work index (BWi) ranged from 10–35 kWh/t, with the majority between 15 and 27 kWh/t. No clear relationships in terms A*b and/or BWi was identified with geological aspects logged from the drill core such as weathering, lithology, alteration, alteration intensity, veining or combinations of these.

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

The most widely used tests for determining comminution performances are the Bond mill work index (BWi), Bond rod mill work index (RWi), resistance to abrasion and breakage index (A*b), and the drop-weight index (DWi). The most common processing recovery tests are based either on flotation or leaching operations.

Wi the bond ball mill work index ( 1952 ) is a measure of the resistance of the material to crushing and grinding . a bond ball mill work index test may be required for the design of a new mineral processing plant . it is determined by bond ball mill grindability test in …

Comparison of Bond ball mill work index values obtained by different methods used to conduct the test with Itabirite ore samples. Table 2. Bond ball mill work indices for iron ore samples Sample Bond ball mill work índex – Wib (kWh/t) No removal of fines With removal of fines Itabirite #1 (composite)* 22.4 (7.6) 14.5 (4.9)

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English term or phrase: Bond Mill Work index Context: "The Ball Mill Work Indices (BMWi) varied both between and within the deposits, but were generally moderate in the range of 7 …

The integration of geological and geometallurgical data can significantly improve decision-making and optimize mining production due to a better understanding of the resources and their metallurgical performances. The primary-response rock property

In this context, the present work aims at using drill cores to acquire information about texture. Recently, interest in automated drill core scanning has increased, with extensions towards 3D textural analysis (Becker et al., 2016), and correlations between the textural class and their behavior in the process (Nguyen et al., 2016, Pérez-Barnuevo et al., 2016).

Ball Mill Design/Power Calculation. Jun 19, 2015· 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', …

The ability to simulate the Bond work index test also allows examination of truncated ball mill feed size distributions on the work index. For grinding circuits where the feed to a ball mill is sent directly to the classifier and the cyclone underflow feeds the ball mill (see Figure 3.10), a question arises as to whether this practice will alter the ball mill work index (BW i) of the material ...

Bond Work Index. A standard 12″ × 12″ laboratory Bond ball mill was used to conduct the work-index experiments. About 50 kg of each of the BHQ and BHJ samples was prepared in −3.35 mm size by a jaw crusher followed by a roll crusher. Size analysis results for the crushed products of the BHQ and BHJ samples are shown in Fig. 1.

The Work Index (BWi) is calculated according to Fred Bond's Equation. Bond Work Index for Testing Procedure Cleaning and Storing of Ball Mill Charge after the Bond Work Index Procedure is done: Add about 500 g of silica sand into the mill containing the ball charge. Seal the mill. Rotate for 20 revolutions to clean.

The Bond-mill was rigged with a digital electric power measurer. The systematic experiments were carried out parallel in both mills using the conventional and the developed methods. Finally the results of both were compared. The measuring results have proved that the Bond-work index can be determined based on the developed methods.

Here is the old Allis-Chalmers Bond Work Index Grindability Test Procedure. The standard feed is prepared by stage crushing to all passing a 6 mesh sieve, but finer feed can be used when necessary. It is screen analyzed and packed by shaking in a 1000-cc graduated cylinder, and the weight of 700 cc is placed in the mill and ground dry at 250 ...

Ball mill charge size distributions originally specified for Bond grindability tests to determine the Bond Work index (BWi) are not commercially available. Those proposed to date do not match all of Bond's (1961) original specifications of …

Difference Between Grate And Overflowing Ball Mill. Wi the bond ball mill work index 1952 - is a measure of the resistance of the material to crushing and grinding bond ball mill work index test may be required for the design of a new mineral processing plant t is determined by bond ball mill grindability test in a lab using a bond mill.

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 maximum and finally the …

First thought, apart from the above, is a P80 of 50mm (2") when say 15mm/20mm could be achievable even at that bond work index of 20kWt/h. as a direct mill grate discharge prior pebble crushing. Frankly, I would really like to have a close look at this ourselves if it ever got passed the design stage.

The Bond Ball Mill Work Index (BBWi) test is carried out in a standardised ball mill with a pre-defined media and ore charge. The Work Index calculated from the testing can be used in the design and analysis of ball mill circuits The test requires a minimum of 10kg of sample that has been stage-crushed to passing size of <3.35 mm.

A modified bond ball mill procedure (mod bond) was developed by minnovex technologies (now sgs) which requires 1.2kg of sample crushed at minus 3.35mm. the 1.2kg charge is milled with the standard bond ball mill for a set time. a particle size analysis is performed on the feed and ground product, and a modified work index is calculated using a ...

Rod mill work index is used in the SAGMILLING.COM Bond/Barratt specific energy consumption model . The work index is used to calculate the energy requirement to grind rocks in the medium size range, from 10 mm - 20 mm down to about 2 …

Everyone involved with mineral processing has heard of the Bond Work Index, synonymous with grinding circuit design.Now the man behind this, Fred Chester Bond, is being inducted into the International Mining Technology Hall of Fame in the comminution category for 2015. Fred Bond's work on circuit design occurred from the late 1930s to the mid 1960s and …

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The Bond work index is not solely a material constant but is influenced by the grinding conditions. For example, the finer the grind size desired, the higher is the kWh/t required to grind to that size. Magdalinovic [38] measured the Bond work index of three ore types using different test screen sizes.