Bond work index (BW i) is a measure of the hardness of an ore. This is a quality of the rock, which generally does not change over the size ranges encountered in ball milling. The BW i is used to predict the power required for grinding. The equation used for calculating power required for grinding is: Where W = KwH per short ton
WhatsApp: +86 18838072829A Josefin Equation (Josefin Doll, 2018) was used to extrapolate the work index at the target grind size based on the ore's measured exponent of ; this corrected work index was used for ...
WhatsApp: +86 18838072829for typical or average grinding size ... depending upon the grinding characteristics of the ore itself. ... (100 mesh). Multiplier from Table 1 at 80% passing = Micron size for application = 149 microns (100 mesh). D50 C required = = 186 microns for application. This D50
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WhatsApp: +86 18838072829Accordingly, the grindability curves associated with the chalcopyrite ore studied in this work, for each mesh size as a function of grinding time, are illustrated in Fig. 5. Notice that, in all tests performed in this work, the 200 mesh (75 μ m opening) was chosen as the passing mesh parameter.
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WhatsApp: +86 18838072829Lab rod mills tend to produce a particle and mineral P80 of similar size (can vary when high levels of mica or similar), but the plant closed circuit mill with a hydroclone can give finer grind size of the heavier minerals. This ultimately might mean that that the plant grind size can be coarser than the lab grind size.
WhatsApp: +86 18838072829[randpic]Grinding and Classification Circuit 911 Metallurgist201621 Ore from the belt feeder enters a 10′6″dia. x 13′0″ ball mill, which grinds the 5/8" ore to 70% minus 200 mesh. Barren solution is added to the ball mill to produce a slurry
WhatsApp: +86 18838072829consumption in this size range, so the exponent changes discontinuously below 100 µm. These variations, as a function of particle size, have been long known and are the reason why the tumbling mill work index tests should be run with a closing mesh that provides the P80 in the laboratory that is close to the P80 expected in the industrial plant.
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WhatsApp: +86 188380728292. From the ball mill discharge size distribution calculate the %+75 μ as: 100 % = % +75 μ. 3. Calculate the CSE as the average: ( + ) ÷ 2 = % + 75 μ. In this example the ball mill circuit classification system efficiency is per cent at 75 μs. This means that
WhatsApp: +86 18838072829The bond work index for a meshofgrind of 200 mesh for a rock consisting mainly of quartz is kWh/ton. How much power in kW is needed to reduce the material in a wetgrinding ball mill from an 80% passing size of 1100 µm to an 80% passing size of 80 µm at a capacity of 10 ton/hr? ANSWER: Could you please show the solution?
WhatsApp: +86 18838072829The measured BW i was and kWh/t for the medium/hard and soft ore, respectively, at a closing screen size of 106 μm compared with the simulated values of and kWh/t. The ability to simulate the Bond work index test also allows examination of truncated ball mill feed size distributions on the work index.
WhatsApp: +86 18838072829F80 80% passing size of the circuit feed (µm) Gpr Grams (new minus closing screen aperture) per mill ... test that is one (standard square root of 2 series) mesh size coarser than the plant ball mill circuit P80. If choosing between two standard mesh sizes, choose the finer ... (and the ore Wi = circuit operating Wi), in accordance with the ...
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WhatsApp: +86 18838072829An easy and fast/quick way for grinding operators to get an idea and estimate their grinds is to follow this procedure. Using a calculator an those 2 simple tools will get you a fast P80 or Pxyz. This great simple tool/method lets you estimate the grind size of any stream using a wet vibrating screen (single deck) and a Marcy scale.
WhatsApp: +86 18838072829Ball mills are used for wet grinding iron ore, ... Grinding on the other hand involves reducing the size such that 80% of the material will pass . through a 150micron mess (150µm).
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WhatsApp: +86 18838072829Tests are conducted at the mesh size to which the ore is to be ground in practice, and the to be expected from a given mill is calculated by the grindability with that of a similar standard ore whose verformance characteristics arc known.
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WhatsApp: +86 188380728291 Introduction Ball mills are progressively used to grind the ores for particle size reduction and to liberate valuable minerals from the ores. The grinding of ore is a highly energyintensive process [ 1, 2, 3, 4 ]. In this process, the size of the particle obtained depends on the energy consumption of the ball mill.
WhatsApp: +86 18838072829The mill feed must be prepared by controlled crushing to passing 6 Tyler mesh ( mm). The ﬁrst grinding cycle feed must be 700 cm3, and this volume's weight is ﬁxed as the mill charge in all subsequent cycles. Fresh feed PSD is obtained to calculate the 80% passing size (F80) and undersize weight already present in the feed. The ...
WhatsApp: +86 18838072829property of an ore) from SMC ® and Wi BM tests (kWh/t), x 2 is 80% passing size for the product or the P80 ( m), x 1 is the 80% passing size for the feed or the F80 ( m), and f(x j ) is defined as:
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WhatsApp: +86 18838072829A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work index of 15 and a size distribution of 80% passing ¼ inch (6350 microns).
WhatsApp: +86 18838072829It seems certain, however, that the ballmill will crush to 200 mesh a considerably greater tonnage when the proper classification is provided. Since in previous tests the mill has crushed 7½ T. per hr. from ¼ in. to 200 mesh, it seems possible that it will crush at least 8 T. per hr. from 48 to 200 mesh.
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