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The test work involved Bond ball mill testing, rod milling, low intensity magnetic separation (LIMS), and batch ball milling down to product sizes of around P80~25 microns. A total of 18 Bond tests and over 150 batch grinding tests and sieve sizing were carried out.
The traditional Bond work index proposed by Bond over 60 years ago is still today a useful tool for characterizing material crushability and grindability in the minerals industry. Although not as popular as the Bond ball mill or the Bond rod mill work indices, the impact work index, also called Bond crushability index, continues to be much ...
Bond Rod Mill Grindability Test. The test determines the Bond Rod Mill Work Index which is used with Bond''s Third Theory of Comminution to calculate net power requirements when sizing ball mills*. Various correction factors may have to be applied. The test is a closedcircuit dry grindability test performed in a standard rod mill.
The Bond Rod Mill Work Index (RWI) is used in conjunction with Bond''s Third Theory of Comminution to calculate net energy requirements for sizing rod mills. The test is conducted in a 305 mm diameter by 610 mm long (inside dimensions) horizontal axis mill.
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.
The Bond rodmill work index is used in conjunction with Bond''s third theory of comminution to merely calculate net energy requirements for sizing rodmills. This test was originally developed in the mid 1930s by Bond.
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 Professional Metallurgical Testing Laboratory.
[citation needed] But note that the term ''rod mill'' is also used as a synonym for a slitting mill, which makes rods of iron or other metal. Rod mills are less common than ball mills for grinding minerals. The rods used in the mill, usually a highcarbon steel, can vary in both the length and the diameter.
CORRELATION BETWEEN BOND WORK INDEX AND MECHANICAL PROPERTIES OF SOME SAUDI ORES Gamal S. Abdel Haffez KAU, Jedd, KSA ... The Bond work index is regarded as one of the crushing ... The Bond grindability test has been widely used for predictions of ball and rod mill energy requirements and for selection of plant scale comminution equipment [5
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. A) Total Apparent Volumetric Charge Filling – including balls and excess slurry on top of ...
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Apr 27, 2016· • Laboratories using a smooth liner should not be marketing their test as a "Bond rod mill work index". It is reasonable to call such tests a "rod mill work index", but they should not be using the name "Bond" unless fully compliant with Bond''s specification, notwithstanding the historical ambiguities discussed in this commentary.
FIGURE 5: BOND ROD MILL WORK INDEX v. UNCONFINED COMPRESSIVE STRENGTH 0 100 200 300 400 UCS (MPa) 5 10 15 20 25 30 35 WiRM (metric) The lack of fit observed relating the crushing Work Index was expected to carry over to the other Bond Work Indices. Figure 5 displays the plot of rod mill Work Index (Wi RM) versus UCS. These
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Support from ''s grinding experts. Every mining operation has a unique grinding process. has experience of over 8,000 grinding mills globally, including manufacturing and delivering the largest SAG/AG mills in the world.
Bond Rod Mill Index Test. Measuring ore grindability in rod mills. The Bond Rod Mill Work Index is a measure of the resistance of the material to grinding in a rod mill. It can be used to determine the grinding power required for a given throughput of material under rod mill grinding conditions. It is a ''locked cycle'' test conducted in closed ...
Relation of Bond rod mill work index and crushing work index. Similar to the ball mill work index, the rod mill work index is a tumbling test that includes both attrition and abrasion breakage mechanisms. Unlike the ball mill work index, the size of the feed to a rod mill test (10 mm–12 mm) is closer to the size of the crushing test.
Figures for the popular mill types. 3 c is the mill speed measured as a fraction of the critical speed. More reliable models for the prediction of the power drawn by ball, semiautogenous and fully autogenous mills have been developed by Morrell and by Austin. (Morrell, S. Power draw of wet tumbling mills and its
SPECIFIC COMMINUTION ENERGY General ... Semiautogenous (SAG), rod and ball mills. As well as the total specific energy it will also predict the specific energy of the crushing section, the HPGR section and the tumbling mill section ... DWi and the ore specific gravity as well as the Bond ball mill work index (Wib). As the Mia, Mic,
JKTech Laboratory Services Bond Rod Mill Index Test (BRMWI) A Bond Rod Mill Index Test (BRMWI) is a standard test for determining the Rod Mill Work Index of a sample of ore. The BRMWI is a measure of the resistance of the material to crushing and grinding. It can be used to determine
Bond duration, like maturity, is measured in years. It''s the outcome of a complex calculation that includes the bond''s present value, yield, coupon, and other features. It''s the best way to assess a bond''s sensitivity to interest rate changes—bonds with longer durations are more sensitive.
The Bond rod mill work index is used to calculate the power requirement to grind from ~½" to about 14 mesh. The test has been mainly used for the design of rod mills or primary ball mills, but it can also be used along with the other Bond tests (BWI and CWI) for SAG mill design
Bond''s approach consists of determining the ore hardness characteristics, or Work Index (Wi) via standardized laboratory testwork. The full suite of Bond comminution tests provide the Ball Mill Work Index (BWi), the Rod Mill Work Index (RWi), the Crusher Work Index (CWi) and the Abrasion Index (Ai).
Commentary on the apparatus of the Bond rod mill Work Index by Alex Doll December, 2015 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.
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