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Numerically, the work index is the energy required in kwht to reduce a given material from theoretically infinite feed size to 80 passing 100 microns. The work index of a particular material is determined in the laboratory by conducting the standard Bond grindability test. Bond developed separate tests for the rod mill and the ball mill.
the procedure for testing ores for a Bond Ball Index. This parameter is still one of the most demanded tools in the design, evaluation and optimization of ball grinding plants around the world. However, the testing methodology for the Bond Dall Index requires about 10 kg of sample, the standardized equipment and takes an average of 6 to 12 hours.
However, multivariate complexity and compositional data constraints can make this analysis challenging. This study applies unsupervised and supervised learning to establish relationships between the Bond ball mill work index BWI and geomechanical, geophysical and geochemical variables for
The experimental regime consisted of 16 grinding tests plus control repeats and a Bond Work Index test on a gold ore sample. The 16 tests are made up of combinations of four different feed sizes and four different ball size distributions as detailed in Table 2. The ball charge in each test maintained the Bond ball charge mass of 20 kg. Table 1.
Typical F 80 size Typical P 80 size 11 000 m 900 m Models Bond models 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.COM models expect a mill with a wave liner , and is not compatible with mills using smooth liners . ...
Table 1. Characteristics of balls used in calibrated bond ball mill for work index test. Diameter of balls mm 38.1 31.75 25.4 19.05 15.87 Number of balls 13 20 3 21 28 Besides, the results of work index tests are accordingly implemented in Equation 5 to calculate the ore work index values. Equation 5 is
Reference mineral Granite of known weight and work index 15.14 Kwh tone was ground for 30 minutes at a particular speed and power consumed was determined from the power rating of the ball mill. An identical weight of Wasagu Manganese ore whose work index was to be determined was ground in the same ball mill under same condition as
Bonds 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
bond s work index ball mill manufactuering design Know More. Ball mill design requires a Bond work index BWi for ball mills at the correct passing size SAG mill design requires an appropriate SAG test for example SPI Chapter 5 Flotation design needs a valid measure of kinetics for each sample including the maximum attainable recovery and rate constants for each mineral Chapter 12
Epoxy - typical rubber toughened Epoxy - typical amine-cured Phenol-resorcinol resin Urea-formaldehyde resin Styrene-butadiene rubber Acrylonitrile-butadiene rubber Carbon fibre reinforced plastic CFRP abraded 12.4 19.1 30.3 33.5 32.4 33 40.2 40.6 41.4 41.5 45.0 45.1 45.5 46.2 52 61 29.1 36.0 58.0 High energy surfaces - metals ...
Tests range from industry standards, such as Bond Work Index Testing, to cutting-edge techniques such as pulp chemistry monitoring, to help optimise comminution circuits. We are also a Metso accredited laboratory for fine grinding. We have comminution equipment including ball mills, rod mills and a range of crushing equipment.
The Geometrical Parameters dialog box lists interatomic distances and bond angles recorded in .ffe output by ORFFE. On selection of a bond 2 atoms or a bond angle 3 atoms in this dialog box, the corresponding object in a ball-and-stick model is highlighted, and vice versa.
Nov 18, 2014 The Bonds work index values increased as test sieve size decreased. 16. Bond work index is changed with the change in the test sieve size and circulating load. This must be taken into account when energy consumption is calculated according to the Bond formula. unit energy cost extra increased as circulating load decreased from 250.
The Bond work index determination according to the standard Bonds test is done on all these samples with compara-tive sieve size of 74, 105 and 150 microns. The Bond Work Index is calculated using the formula Bond, 1961 1 where W i Bond work index kWht P c test sieve mesh size m G weight of the test sieve ...
Alsto Bond Index Ball Mill Internationally accepted mineral metallurgical standard test procedures to determine the physical properties of ores include the Bond ball mill work index. This is empirical index determined by closed circuit grindability tests developed by F.C.Bond in the mid 1930s.
the work index depending on the grind size. In this way, work index values are usually obtained for some specific grind size that characterizes the grinding operation to design or under evaluation. This study was carried out in a standard bond ball mill 305 mm x 305 mm size in mineral processing laboratory, in the mining engineering department ...
FIGURE 6 BOND BALL MILL WORK INDEX v. UNCONFINED COMPRESSIVE STRENGTH 0 100 200 300 400 UCS MPa 5 10 15 20 25 30 WiBM metric Figure 6 displays the plot of ball mill Work Index Wi BM versus UCS. Still no relationship is observed.
screened and the index determined from the size analysis curves. 2.5 Work Index Determination The as-received samples were prepared to all passing 3.35 mm. The -106 m particles were also removed and analysis was conducted on the -3.35 mm 106 m material. The tests were performed in a standard Bond ball mill with weight of material
Figure 9 Correlations to Bond Work Index A Effect of modulus of elasticity of the different studied materials on Bond work index, B Effect of compressive strength of the different studied materials on Bond work index, C Effect
Internationally accepted mineral metallurgical standard test procedures to determine the physical properties of ores include the Bond ball mill work index and the Bond rod mill work index. These are empirical indices determined by close circuit grindability tests developed by F.C.Bond in the mid 1930s.
Show full abstract 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 ...
Jan 01, 1989 The Bond work index, W i, as an indicator of the grindability of raw materials is not a material constant but rather it changes with change of size of the grinding product.Therefore, in practice we can expect some difficulties and errors when the energy consumption is determined according to this formula in the case when, for a given size of grinding product, the value of the work index W i ...
Table I shows the Bond ball mill work index obtained for the ore samples as well as the iron and silica content in concentrate and tail after LIMS. The concentrate weight recovery was in the order of 5060. Furthermore it may be observed that the Bond ball mill work indices for
The Bond Abrasion Test determines the Abrasion Index, which is used to determine steel media and liner wear in crushers, rod mills, and ball mills. Bond developed the following correlations based on the wear rate in pounds of metal wearkWh of energy used in the comminution process.
XMGQ305 Grinding Bond Ball Rod Mill is mainly applied for testing the grinding work index of the material of every kinds of ores, slag, etc. Pilot Ball Mill we design and produce the pilot ball mill for mining and mineral processing.
Prev work capacity Next work lead Glossary Search Mineral andor Locality Mindat.org is an outreach project of the Hudson Institute of Mineralogy , a 501c3 not-for-profit organization.
Gates, J.D, Giblett, A, Dunne, R. 2012 Prediction of plant ball mill media wear rates from laboratory ball mill test data, Comminution 12, Minerals Engineering. Wear of grinding media in the ...
two. Results of Bond ball mill tests conducted with closing screens of 75 m or finer are to be treated with caution. The Bond Work Index relationship has been noted to apply down to approximately 70 m, and perhaps no finer , without making qualifications. Calculations First, calculate the actual Operating Work Index, WloACT-, of the
Where, WioACTis the Actual Operating Bond Work Index kWht, W is the specific energy input kWht, P80 is the 80 passing size of product m, and F80 is the 80 passing size of circuit feed m. 2. Calculate the Standard Circuit Bond Work Index WiSTD for
TEST WORK qBond Work Index Testing Bond Ball Work Index Bond Rod Work Index Bond Crushability Work Index Bond Abrasion Work Index qJK Tech Testing JK Drop weight Test SAG Milling Comminution Test SMC COMMINUTION PILOT PLANT qAGSAG Pilot Milling Mill dimensions 1.7m x 0.6m length Typical throughput 0.5 -3.5 th depending
ball mill product for ores in guyana Know More. small scale gold mining guyana is manufactured from Shanghai Xuanshi,It is the main mineral widely used Ball Mill in Paldi, Ahmedabad, Gujarat, India Bond Rod amp Ball Mill Work Index from crushing through to final product with throughput ranging from 1 to 5 tonnes per day, Cone crusher manufacturers in Guyana....
Nov 02, 2020 The results indicated Bond Ball Work Index value of 11.2-13.1 kWht for Starlight primary fresh mineralisation, which is lower than many primary Yilgarn gold deposits. ALSO READ Starlight Discovery A Driving Force to Musgrave Minerals ASX MGV Expanding Resources and Potential. Gravity and Cyanide Leach Test work
In conjunction with the Bond ball mill work index they can be used to accurately predict the overall specific energy requirements of circuits containing AG and SAG mills, Ball mills, Rod mills, Crushers, High Pressure Grinding Rolls HPGR.