• the bond ball mill work indices determinations gave reasonably reproducible results, • significant variation was observed in the measurement of the bond rod mill work index on at least one sample tested, and • large variations in abrasion index and crushing work index were due to variations in the test method across the laboratories.
associated values reported in the literature for Bond's ball mill work index and is far superio r to those reported for Bond's rod mill and crushi ng work inde x tests ( An go ve and Dunne, 1997)
Specific Gravity Advanced Terra Testing, Inc. (ATT) Unconfined Compressive Strength ASTM D 5731 Specific Gravity, ASTM D 854 Dawson Metallurgical Laboratories, Inc. SAGDesign (SAG to T80 12 M followed by Bond BM Wi on SAG ground ore) Bond Ball Mill Work Index (Crushed Feed)
Standard Bond ball mill grindability tests and calibrated Mod Bonds, using a closing screen of 270 mesh (53 microns), classified most samples as medium to moderately hard and averaged kWh/t (Mod Bond only). The SPT lockedcycle high pressure indices (HPi) ranged from kWh/t to kWh/t averaging kWh/t.
Table 3 Bond ball mill work index database table for example samples Id Name WiBM µclosing WiBM f80 WiBM p80 WiBM gpr WiBMSynthetic Laboratory Comment 1529Lik composite 7 ALS Kamloops Zazu metals NI43101 March 3, 2014 1600Gamsberg Pyrite 106 van Drunick Gerold Palm, IMPC2010
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]. This measurement is expressed in kilowatt ...
40 Isles Road, Indooroopilly, QLD 4068, AUSTRALIA | Telephone: +61 7 3365 5842 | Facsimile: +61 7 3365 5900 | info | After each batch grind, the contents of the mill are sieved on the selected 'closing' screen to remove the undersize.
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Ball Mill Work Index has been widely used for ball mill sizing, and is also utilized in computer simulation. BOND ROD MILL GRINDABILITY TEST The Bond Rod Mill Grindability Test is also performed according to the original Bond procedure. It requires 15 kg of minus ½ mesh material that is preferably prepared at the testing facility. The Bond Rod ...
See this useful summary Table of Bond Work Index by Minerals. For any circuit, whether a crushing circuit, a rod mill, or a closed ball mill circuit, the Work Index always means the equivalent amount of energy to reduce one ton of the ore from a very large size to 100 um. The sample was received crushed appropriately for the ball mill test.
The reason for this variation in ball mill work index is because the ore at Mt. Milligan has an intrinsic exponent of in the 100 µm to 200 µm size range, not the 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 three tests are: The Bond ball mill work index (Wi BM, or BWi) conducted from a feed size of approximately 2 mm to a product size on the order of 100 µm. The Bond rod mill work index (Wi RM, or RWi) conducted from a feed size of approximately 10 mm to a product size on the order of 1 mm. The Bond crushing (impact) work index (Wi C, CWi ...
Conclusions. The power model and linear model both will give reasonable P80 estimates given the P100 of a Bond ball mill work index test product. The power model might be marginally more robust ...
In the JKTech database % of the 4,608 ore types tested have higher A*b values (refer to Table 2). ... In conjunction with the Bond ball mill work index the DWi and the Mi suite of parameters can be used to accurately predict the overall specific energy requirements of circuits containing:
JKTech's testing, equipment and laboratory services ensure globally reliable results. JKTech Pty Ltd P: +61 73365 5842 ... • JK Bond Ball Mill Test • Bond Ball Mill Work Index Test • Bond Rod Mill Work Index Test • Point Load Test • Equotip esTt • HPGR esTt • Flotation esTting
bond ball mill work index database jktech Raymond . bond ball mill work index database jktech. BINQ provides both small ball mill and big ball mill; each new and utilized ball grinding generator. For medium natural .
Ball Mill Power/Design Calculation Example #2 In Example it was determined that a 1400 HP wet grinding ball mill was required to grind 100 TPH of material with a Bond Work Index of 15 ( guess what mineral type it is ) from 80% passing ¼ inch to 80% passing 100 mesh in closed circuit.
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JK SimMet Software Training This training course provides training for those who wish to model, simulate and optimise crushing and grinding circuits. It will cover each of the models and demonstrate the model fitting procedure. JKSimMet Software JKSimMet was developed for the analysis and simulation of comminution and classification circuits in mineral processing operations.
Since first being introduced by F Bond in 1952, the Bond Work Index, derived from the Bond Ball Mill (BBM) Test, is a measure of the resistance of the material to crushing and grinding and can be used to determine the grinding power requirement for ball milling.
An alternative mill ball charge is proposed that closely approximates Bond's original total ball mass, number of balls and ball surface area. Results of 30 Bond Work index tests of six pure materials (calcite, magnesite, labradorite (feldspar), quartz, andalusite and glass) using closing screen apertures (P 1) values of 500, 250, 125, 90 and 63 ...
Bond and Grinding Calculations Scribd. British Chemical or grinding in closed circuit produces less fines than open circuit operation,and causes a: to of Rod Mill Index JKTechA Bond Rod Mill Index Test (BRMWI) is a standard test for determining the Rod Mill designing and optimising a milling circuit using the BRMWI,the ...
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.
For comparison purposes, Figure shows the measured values of the variability samples plotted in the Bond Ball Work Index database. ... This site uses cookies. Some of these cookies are essential to the operation of the site, while others help to improve your experience by providing insights into how the site is being used.
Chadormalu deposit is one of the largest iron ore mine in , which is located in Yazd province. The representative ore sample contained 57%Fe, %P and %S. The sample was crushed; afterward, it was ground in various grinding times according to the Bond Ball mill approach to specify the work index values.
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