Abstract: 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 comminution plants designing. Determining the Bond work index value is quite complicated, time-

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...

A Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mill(s) and the associated grinding circuit(s). Sample requirements: A minimum of 8 kg of material crushed to nominally minus 10 mm is preferred. JKTech would stage crush the sample to minus 3.35 mm, as required for the Bond Ball Mill Work Index test feed.

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.

However, if the sample is to be prepared by cutting with a diamond saw (cut-core method) as little as 5kg is normally sufficient. Also remember that the products from the SMC Test® can be re-used for Bond ball work index testing, the SMC Test® being effectively used as a feed preparation step for the Bond ball work index test.

deviation of the standard locked cycle Bond Ball Mill Work Index Test (BMWI), where the circulating load and the classification efficiency were systematically changed to determine their relationship on milling performance. The tests were completed in a Labtech Essa laboratory mill that was 200mm ...

The Bond Ball Mill Work index (BBWi) is the industry standard procedure for assessing the grindability of ores. The test involves conducting a locked-cycle grinding test using ond's standard mill design. The locked-cycle test enables a batch process to emulate the grinding behaviour of a continuous mill with a 250% recirculating load.

The Bond Index conforming rod charge consists of: 6 rods of 1.25" diameter and 21" length. 2 rods of 1.75" diameter and 21" length. The grinding jar for the Bond Index Rod Mill is 12″ x 24″ in size and has a wave-shaped design. At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill.

It can be seen that in the regime in which the Bond equation is valid, energy use increases exponentially as product size decreases with constant feed size, with an exponent of (approximately) −0.5. For P80s finer than 75 μm, the Levin test, a modified Bond ball mill work index test, may be used to predict grinding performance.

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 …

The ball mill work index laboratory test is conducted by grinding an ore sample prepared to passing 3.36 mm to product size in the range of 45-150 µm, thus determining the ball mill w i .

SAGDesign (SAG to T80 12 M followed by Bond BM Wi on SAG ground ore) Bond Ball Mill Work Index (Crushed Feed) Specific Gravity (part of the SAGDesign test). Ball Mills – Mine Engineer provides mining, gold, copper …

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 the energy required for grinding, …

The Bond Mill work index was determined to be 13.1 Kwh/tonne. A gravity test was conducted, and it was determined that the 37.5% of the gold exists as microscopic free gold, indicating that in any future mill design a gravity circuit could be implemented at

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

3- STANDARD BOND TESTS The Bond's standard ball mill is used to determine the work index value of differ ent samples. The Bond work index is defined as the kilowatt-hours per short ton required to break from infinite size to a product size of 80% passing 100 µm. If the breakage

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 a standard ball charge.. Below describes in general terms the Bond Work Index Procedure used by a …

bond abrasion mill index test standards. bond abrasion mill index test standards energetischoporde. bond work index for an ultrafine mill aiwabait. bond mill work index definicion compressive strength and modulus of elasticity and the bond work index of these samples were estimated The value of Bond work index of the above samples has shown a …

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 …

(approximately 0.12%) and Phyrotite (0.02%). The Bond Mill work index was determined to be 13.1 Kwh/tonne. A gravity test was conducted, and it was determined that the 37.5% of the gold exists as microscopic free gold, indicating that in any future mill design a gravity circuit could be implemented at the front end of the concentrator.

The ambiguous definition of Bond & Maxton's specification of the inside diameter of a wave liner can reasonably result in less than 3% variation in the results of a Bond rod mill work index. Final thoughts and recommendations The Author is aware that other comminution consultants will have different opinions. Comminution is

71 x 0.75" balls. 94 x 0.61" balls. The optimum number of grinding balls is 285. However, the ball diameters vary due to wear. Therefore, the total ball number should be adjusted from time to time to ensure a total mass of 20.125 grams. The grinding jar of the Bond Index Ball Mill measures 12″ x 12″ and has well-rounded corners.

Drillcore pre-crushed to < 12.50 mm and sieved. Half a drillcore pre-crushed to < 12.50 mm and sieved. The Bond Index conforming rod charge consists of: 6 rods of 1.25" diameter and 21" length. 2 rods of 1.75" diameter and 21" length. The grinding jar for the Bond Index Rod Mill is 12″ x 24″ in size and has a wave-shaped design.

Commentary on the apparatus of the Bond rod mill work index The Bond "Third Theory" of comminution was originally divided into three size classes reflecting the varieties of comminution equipment common during the time period when Bond (and his collaborators) were gathering the information to calibrate comminution models.

Indice de Bond vs Dureza del mineral. F.C.Bond: The correlation between the abrasion index and the work index is very poor Metal Wear In Crushing and Grinding,1963. A OneSteel Group Business Indice de Bond vs Dureza del mineral. Por el contrario, la …

Adhering to the R&D tenet of "independent innovation", the company's annual R&D investment accounts for more than 3% of total sales. It is supported by CAD, Solidworks and other computer-aided design systems, Ansys, matlab simulation analysis software, and VCC, EasyBuoder8000 and other programming software.

The standard Bond Ball Mill Work Index test procedure is firstly to stage crush the feed to minus 3.35mm, and size a representative sample. The test then involves a series of batch grinds in a standard Bond mill. A Bond mill is 0.305m by 0.305m, with rounded corners, a smooth lining, and runs at 70rpm. ...

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.

crushing and grinding calculations by fred c bond. For full details, refer to the original Bond paper (Ref: Bond, F.C. 1961. "Crushing and Grinding Calculations Part I and II", British Chemical Engineering, Vol 6., Nos 6 and 8). A Bond Ball Mill Work Index test may be required for the design of a new mineral processing plant. Where possible, it …

Bond Ball/Rod Mill Work Index. 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 proposed by the Bond [21]. The BBMWI determines how much energy is needed to grind a sample of ore in a ball mill [22].