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Get PriceTo calculate bond rod-mill work indices, the four samples were screened and the particle size distributions plotted in fig.2.The plot was used to find f 80 of the samples for calculations.Fig.3, fig.4 show the grinding kinetics of pb, cu, fe, and mn ores in the bond rod-mill in different test-sieves.The slopes of all lines in the figures are equal to the k value of eq.
Generally, bond work index is a common method for selecting comminution equipment as well as estimation of grinding efficiency and calculating required power.In the current research, a simple, fast and accurate procedure is introduced to find the.
Read NowThe bond low-energy impact crushing work index more informally, the bond crushing work index is not as common as the bond ball mill work index, and it is a notoriously noisy test.The test is a per-specimen test where individual specimens of prepared rock are hand-picked by the test operator and placed into the apparatus.
Read NowWhere, 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 the material being processed equation 3.Wtotal.
Read NowThe mill power is 22.5 watts, calculated by 6.Fi- p nally the product is wet screened to find the size d80.2.4.Rod mill semi continuous process the same mill is used for the semi continuous grinding tests which is similar to the bond test but with the exist- ing mill of known power.After time the mill.
Read NowFigure 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.
Read NowThe aim of this study was to develop a new method for assessing the bond work index in a ball mill bbwi, which is based on a first order kinetics present in the bond ball mill for grinding mineral raw materials austin et al., 1981 ahmadi and shahsavari, 2009.Theoretical basis of quick procedure.
Read NowThe bonds 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 m.If the breakage characteristics of a material remain constant over all size ranges, the calcul ated work.
Read NowBond standard circuit work index assume the rod mill work index of 9.5 applies from the actual rod mill feed sizeof 19,300 m although some of this work might ideally be done by crushers to achieve a rod mill f80 of 16,000 m to a rod mill circuit product size of 1,000 m.W1 9.5 x 10 1,000 10 19,300 2.32 kwht.
Read NowBond ball mill work index is used for determine the grindability of materials, and help to choose the suitable grinding equip.Position home page products laboratory equipments lab grinder.Bond ball mill work index.
Read NowEnglish term or phrase bond mill work index context the ball mill work indices bmwi varied both between and within the deposits, but were generally moderate in the range of 7 to 12 kwht.Je pense indice du travail au broyeur boulets.
Read NowThe bond work index approach is the standard method of selecting ball mills to grind from about 3 mm to 25 m provided that correction factors are used if necessary.The power prediction is fairly accurate for devices that produce a product with a size distribution parallel to that of the feed.
Read NowThe bond ball mill grindability test is a locked-cycle laboratory grinding test.It provides the bond ball mill work index which expresses the resistance of a material to ball milling.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, and for ball mill scale-up.
Read NowCorrelation between the bond work indices calculated from three different method hgi, bond ball mill work index and bond rod mill work index was established.Appropriate correlation in the.
Read NowDetermination of the work index for ball and rod mills in 1952 and modified it in 1961.The standard bond ball mill grindability test is a closed circuit dry grinding test with a 250 circulating load.The standard procedural outline of the test is stated in bond 1961.The work index for a ball mill, wi, is then calculated from the following.
Read NowThe bond rod mill work indices were much higher than the bond ball mill work index values.Because the ores were so soft, the effect of these bond rm wi results on required sag grinding energy should probably be ignored for the tenke project.
Read NowThe 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 operating production-size rod mills.
Read NowAlternative approaches for determination of bond work.The bond work index wi was calculated from the following equation eq.1 wi 44.5p1 0.23 x gbp0.82 10p 80 12 10f 80 12 eq.1 where f80 is the sie in microns at which 80 percent of the new feed to ball mill passes p80 is the sie in micron at which 80 percent of the last cycle sieve undersie product passes.
Read NowCeltest have the capability to carry out the bond work index bwi test in accordance with epri report cs3612 fgd chemistry and analytical method handbook, volume 2.The bwi is used to estimate the required mill power per ton of product specific energy.The specific energy requirement.
Read NowDetermination of bond index of wasagu manganese ore in kebbi state, nigeria.Alabi oladunni oyelola, shehu aliyu yaro, binta hassan abstract - in this study, the work index of wasagu manganese ore deposit in kebbi state of nigeria was determined using the modified bonds method of determining work index also known as berry and bruce method.
Read NowD mill diameter in meters.The marcy expression is applicable for mill diameters between 1.52 to 4.1meters.Using peripheral speed, the rotational speed can be determined.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.
Read NowBond work index value of these components mixtures is greater than the bond work in-dex of harder components, clinker.Oner 2000 have conducted a research of clinker and blast furnace slag mixture bond work index in different mass propor-tions.He found out that these values are always lower than the bond index obtained.
Read NowStandard bond crushing, and rod mill work indices, abrasion indices and by dawson for bond ball mill work index tests using crushed feed, and standard autogenous grinding design sagdesign tests, patented by outokumpu.See reference 8 below.The comparison of these results gives context to how the various measurements relate to each.
Read NowBond ball mill work index figure 2 ball mill for determining bond ball mill work index 1 for the purists, there were two models in existence at the time the von rittinger and kick models.Neither of these gave results that matched the observations of specific energy consumption from tumbling mills.
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