requirements when sizing ball mills. The test is a closed-circuit, dry grindability test. It is run in a standard ball mill and can be performed at mesh sizes ranging from 48 mesh to 400 mesh. Bond Ball Mill Work Index (and modified Bond Work Index) data can be used in the CEET® grinding simulator. • The Bond Rod Mill Grindability Test ...
The commonly used grindability tests included in the database are the Bond work indices for ball milling, rod milling and crushing; the drop weight test results A, b, A×b, DWi, Mia, Mic, Mih and ...
The Bond rod mill work index is not as common as the Bond ball mill work index, and there are two different variations on the mill apparatus. The SAGMILLING models expect a mill with a "wave liner", and is not compatible with mills using "smooth liners". Most laboratories outside of Australia use the wave liner style of machine – these ...
The Bond rod mill work index (Wir) is measured using Bond́s standard rod mill grindability test, which is conducted in locked-cycle mode to emulate the continuous closed-circuit operation. Besides the laborintensive conduct of the test, which typically requires from 5 to 10 cycles for reaching steady-state, it normally requires 8–20 kg of ...
• WiBM – The Bond ball mill work index, in metric units. • WiRM – The Bond rod mill work index, in metric units. • WiC – The Bond impact crushing work index, in metric units. • Density – The coarse particle density measured in either the Bond impact crushing work index test …
The middle size class, represented by rod milling, is fitted to a tumbling test, referred to as the Bond rod mill work index (WiRM, or RWi). The apparatus used to determine …
Bond Abrasion Index (Ai) – sufficient mass to produce 4 x 400 g of charges of -19+12.7mm ore. Bond rod mill work index (RWi). Typically, 10-12 kg at the target crush size. Bond ball mill work index (BWi). Between 6-10 kg at the target crush size will suffice depending on the number of cycles. Levin open circuit grindability test.
The relationship between the Bond rod mill work index and Bond ball mill work index tells a lot about the difference in grindability, and hence energy requirements, between coarse and fine …
The specification for the apparatus to determining a "Bond" rod mill work index is first described in Bond & Maxton (1943). It states that the apparatus is a tumbling rod mill to be operated in a locked cycle test at a fixed circulating load. The geometry of the grinding chamber is described as: … See more
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.
A Bond rod mill work index test (BRMWI) is a standard test for determining the rod mill work index of an ore sample [21]. The BRMWI is a measure of the resistance of the material to crushing and grinding in a rod mill and is used to calculate the grinding power needed for a given material parcel regarding rod mill grinding conditions. Along ...
FIGURE 8: ROD MILL/BALL MILL WORK INDEX RATIO v. UNCONFINED COMPRESSIVE STRENGTH 100 200 300 400 UCS (MPa) 0 0.5 1 1.5 2 WiRM/WiBM (metric) Siddall et al (1996) identified the ratio of Bond rod mill Work Index and ball mill Work Index as being indicative of an ore's compentency. Figure 8 plots this ratio versus UCS; no trend is apparent ...
Sizing a crusher can be done reliably calculated thanks to the Impact/Crushing Work Index and the testwork research done by Fred Chester Bond and his 1952 paper. According to Bond's Third Theory of Comminution, …
Bond/Rowland rod mill & ball mill specific energy consumption circuit model. Amelunxen SGI SAG and ball mill circuit model. Morrell SMC ... & Trumić (2022) [A new methodology to obtain a corrected Bond ball mill work index valid with …
In the paper proposed by García et al. [5], a deep study on the Bond ball-mill and Bond rod-mill standard tests is shown with different ores. The most impacting result of this work is the ...
For comparing the standard Bond rod-mill work index and the new modeled method, work index (Wi) and produced fine particles in a cycle (Gi) for the four samples determined. The performed paired Student's t-test results indicated that the Standard Deviation for Gi and Wi obtained by the shortened method are respectively 0.50 and 0.58 in ...
Using the Bond work index to measure operating comminution efficiency ... "Selection of rod mills, ball mills, pebble mills, and regrind mills," in Design and Installation of Comminution Circuits, Andrew L. Mular and Gerald V. Jergensen, eds., …
An analysis of the results shows a direct relationship between the Bond work index and the Denver work index when the Bond test is defined adequately to the Denver lab mill. Comparison of results ...
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 …
See Annexes A, B and C for Bond crushing, rod mill and ball mill test equipment and procedures. Accuracy of Comparative Circuit Work Index Efficiency Determinations
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 ...
values. If the Bond work index is assumed to be proportional to the batch operating Bond work index, W. =OC:W. ｾ＠ ｾｯ＠ cc'E ( 1 1,-1.o Tõ ｾMｾ＠ where c( proportionality constant E net specific energy provided during the batch test, (kwh/t) ( 3) If A = oe'E 10, the work index can be computed directly from A(-..! lJ -1.
JKTech Laboratory Services Bond Rod Mill Index Test (BRMWI) A Bond Rod Mill Index Test (BRMWI) is a standard test for de 0 0 395KB Read more Calculation of Work Index
Bond Rod Mill 0.305 12.7 Any 1.18 15 10 Locked-cycle Y Y Bond Ball Mill 0.305 3.35 Any 0.149 10 5 Locked-cycle Y Y Mod Bond 0.305 3.35 Any N/A 2 1.2 Batch N Y ... be designed with the rod mill work index, and single-stage ball mills should be with both the rod mill and ball mill indices. This is because it is common
They investigated the variability of the BWI in the Bond ball mill and Bond rod mill to propose a methodology to model this variability. A series of tests were defined to analyse the variations in grindability characteristics for selected ores. ... Josefin, Y.; Doll, A.G. Correction of Bond Ball Mill Work Index Test for Closing Mesh Sizes ...
The Titan Bond Work Index Rod Mill is one-piece cast construction with integral wave liners of a form described by Bond. This mill is used to perform the necessary metallurgical testing to determine the grinding characteristics of ores and power requirements for …
Use this online formula to calculate a Ball Mill, Rod Mill or SAG Mill Operating Work Index. Based on Fred Bond's work you can estimate the energy used into your grinding circuit. This is the most accurate and informative method, but much of the data necessary for its application is not yet available.
Rod mill power is dependent on mill capacity and work index. Mill power increases with: Increasing rod charge; ... Bond quantified the rod mill power draw as a function of the Work Index, capacity, and a series of correction factors: PM = Wmtest,i FT Q. FT = F1 F2 F3 F4 F5 F6 .
Bond Test WI's (kWh/t): Rod Mill: Ball Mill: 9.5 kWh/t.8 9 kWh/t . Bond Standard Circuit Work Index: Assume the rod mill Work Index of 9.5 applies from the actual rod mill feed sizeof 19,300 mµ (although some of this work might ideally be done by crushers to achieve a rod mill F80 of 16,000 m) to a rod µ
The low energy crushing work index laboratory test is conducted on ore specimens larger than 50 mm, determining the crushing work index (Wi C, CWi or IWi (impact work index)). The rod mill work index laboratory test is conducted by grinding an ore sample prepared to 80% passing 12.7 mm (½ inch, the original test being developed in imperial ...
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 the Bond standard grindability tests on different critical metal …
Work index is the relation between the SEC and the amount of breakage in an ore. The most common form of this relationship is given as Equation 1, and is often referred to as "Bond's …
The traditional Bond work index proposed by F.C. Bond over 60 years ago is still today a useful tool for characterizing material crushability and grindability in the minerals industry.
The document describes a new method for rapidly determining the Bond rod-mill work index through modeling grinding kinetics and mass balance equations. Experiments were conducted grinding four ore samples in a rod mill with three test sieves to determine the grinding rate constant. The standard Bond work index procedure and the new shortened method were used …
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 . David June 19, 2015; 7:07 pm;
The work index Wi can be determined from plant operations and from laboratory ball mill grindability, rod mill grindability, and impact crushing …