What Do Bond Mill Work Index Tell You

Testwork: Bond ball mill work index - SAGMILLING

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.

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Characterization and Comminution Studies of Low-Grade ...

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.

Bond Index Ball Mill / Rod Mill BT 100 XL - RETSCH

The Rod Mill Work Index (RWI) is used for particle size determination in a size range from 25 mm down to 2.1 mm whereas Ball Mill Work Index (BWI) is used for the range from 2.1 mm down to 100 µm. Adjustment of grinding parameters:

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A developed approach based on grinding time to …

Besides, the results of work index tests are accordingly implemented in Equation 5 to calculate the ore work index values. Equation 5 is similar to Bond work index equation, but it has been defined for the foregoing calibrated bond ball mill [15]. P F P G Wi i i 10 10 11.76 1 1 230. 75 u u (5) Where, W i =Bond laboratory ball work index

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A specific energy-based ball mill model: From batch ...

Since Bond work index is a single parameter that does not relate to the particle size effect, it would be difficult to predict the size effect on the grinding result as shown in Fig. 5 using the upgraded ball mill model. 4.2. Separate breakage selection and discharge function

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Methods to Estimate AG/SAG Mill Power Requirements

* Gives you both SAG hardness and Bond Ball Mill Work Index (on SAG ground ore, not from crushed cores) – all you need to design circuit & size mills. * No hidden formula, no IP – only open technology available i.e. convert the test results (in kWh/t instead of strange or no units) to SAG and Ball Mill pinion energy (in kWh/t).

Insmart Systems Bond Work Index Ball Mill - YouTube

Insmart Bond Work Index Ball Mill, work index Mill

Bond Mill Work index | English to French | Mining ...

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 to 12 kWh/t." Je pense à "Indice du travail au broyeur à boulets"

Minerals | Free Full-Text | Testing of Ore Comminution ...

The product size distribution generated from crushing in a laboratory jaw crusher are used to calculate two comminution indices Ci, that can be correlated to Axb and to the Bond ball mill work index (compare Section 3.3), respectively.

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Id Grinding Mill Net 7746. Id Grinding Mill Net 7746 Id grinding mill net 80 id grinding mill net 80 why is the bond ball mill grindability test done the mill work index which expresses the resistance of a material to ball milling used in the maxson cadena and bond test also has internal dimensions of and the 80 passing size of the new feed together with the average net gram.

ON THE DESIGN OF BALL MILLS FOR GRINDING ITABIRITE ORES

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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(PDF) Characterization and Bond Work Index Determination ...

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 …

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conducted within a standard ball mill - Henan Technox ...

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 ...

Bond Work Index Tests - Grinding Solutions Ltd

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.

HPGR vs SAG - Grinding & Classification Circuits ...

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.

Development of Grindability Tests Based on Direct ...

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.

MINE292 Lecture7 Energy Used in Comminution 2013 | Mill ...

Rubber Liners (due to energy absorption properties of rubber) EF9 = 1.07 Correction Factors for Bond W i MacPherson Autogeneous Mill Work Index Test SMC Test JK Rotary Breaker Test JK Drop Weight Test Other Energy Indices Developed by Bond to predict wear rates of ball/rods and liners Quantifies the abrasiveness of an ore A 400g sample is stage ...

Testwork: Bond rod mill work index - SAGMILLING

Rod mill work index is used in the SAGMILLING 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 …

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If that's a proprietary design, you should remove the pictures. If not, they're helpful in figuring out what might work for you. I'd look at making the entire part bar a roughed cone inside taper, then having a fixture that the part nestles into, held there by a thin shellac or other easily dissolved adherent, then finishing the bore with a monocrystalline diamond tool in …

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 maximum and finally the …

DEVELOPMENT OF COMMINUTION TEST METHOD FOR …

estimate Bond work index for the sample. Results show that there is indeed a correlation between the two grindability test methods. Using a linear model, an experimental model is presented, where the Mergan mill can be used to approximate the Bond work index for an ore with good correlation.

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bonds crushing law and work index - shibang-china

Bond impact work index. be used as supplemental grinding media, and slurry, needed ... to crushing - impact work index (a) Low energy Bond impact test - primary ... Relationships between comminution energy and product size for a ... crushing and grinding; ... (lower bond work index), suggesting that the magnetite in the ore may be ...