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Referring to Table VI the L/D can be between 1.75 and 2.0 or even greater. Referring to Table VII a 3.05 meter (10 foot) by 3.05 meter (10 foot) overflow ball mill with a 40 percent by mill volume ball charge, new liners and 50 mm (2″) balls draws 491 HP. Using equation 5 there will be a loss of 0.55 Kw (0.74 Hp) per metric tonnes of balls.
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When accurate mill ore feed rate in dry tons per hour, mill power draw in kilowatts, and mill feed and product size analyses in microns are available the Bond Equation can be used to measure the operation of comminution machines, reporting it as operating work index. The equation for operating work index as given in the paper "Tools …
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In the previous discussion the fact was established that the work done by a ball when it strikes at the end of its parabolic path is proportional to its weight and velocity; then, since the velocity may be considered as constant for all the balls in the mill, the work done by a ball is proportional to its weight. Since the amount of ore crushed varies as …
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The raw vertical roller mill has four rollers, 3000 KW main drive, 4.8 m table diameter, 2.16 m roller diameter with 330 t/h capacity (made by LOESCHE Company from Germany).
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With the installation of one or both of these machines between the ball mill and classifier, as high as 70 per cent of the free gold and sulphide minerals can be immediately removed, thus reducing …
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The specific power consumption, measured in kWh per ton of mill feed, is also an important parameter. ... If one increases the charge and keep the ball:charge ratio the same, then the behaviour of ...
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Get info of suppliers, manufacturers, exporters, traders of Ball Grinding Mill for buying in India. IndiaMART. Get Best Price. Shopping Sell. Help. Messages ... 3.7 KW/5 HP, 1440rpm. Electrical Details: 430 V /3~, 50Hz, 4 pole, 10Amps ... Shalimar Countues Bauxiite Ore Grinding Ball Mill, 15000, Capacity: 1-10 Ton Per Hour ₹ 45,00,000 Get ...
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Calculate the power draw and specific energy for semi-autogenous grinding (SAG) and ball mills. Enter the mill shell parameters, liner system parameters, charge fill parameters, …
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Specific Energy, kWh/ton : ... Net kW / Mill : Available Net Power per Mill. MILL DIMENSIONS AND OPERATING CONDITIONS : Eff. Diameter (ft) Mill Diameter, inside liners. Eff. Length (ft) Effective Grinding Lenght. Mill Speed % Critical : ... Fraction of the Total Mill Power Draw contributed by the Ball Charge.
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Bond estimated the amount of wear in terms of kilograms per kWh based on the abrasion index, A;, i.e., Wet Ball Mill = kg kWh = 0.16(A i-0.015) 0.33; Dry Ball Mill = kg / kWh = 0.023A i 0.5; Replacement Ball Size. Rowland and Kjos proposed the use of their equation for the determination of the initial and replacement media size.
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The composition of the ball mill. The ball mill is composed of main parts such as feeding part, discharging part, rotating part, transmission part (reducer, small transmission gear, motor, electric control). ... and the production capacity can reach more than 200 tons per hour, which meets the needs of modern industrial large-scale production ...
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The first step in this procedure is to calculate from the following formula the work index, which is the kw-hr required to grind one short ton of material from a theoretically infinite size to 80 pct passing 100 microns: where Wi = the work index Gbp = Bond ball mill grindability Pi = micron size of the mesh of grind. For 200 mesh, Pi = 74 ...
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The enterprises consumers grinding media have a question about right choise the grinding ball size (diameter) for the mill in order to achieve the required grinding quality. We noted earlier, this information can be obtained from several sources: ... Wi – specific energy consumption, kW*h/ton; C – the mill drum rotational speed,% of the ...
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There are two "inputs" to a ball mill circuit: the ore fed to the circuit and the power delivered by the grinding mill. A ball mill circuit has two "efficiencies": that of the ball mill grinding environment* and that of the classification system*. A ball mill circuit has two efficiencies because it has two main functions:
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A.S. Erdem, Ş.L. Ergün, A.H. Benzer 222 () KW b D V p fC s C S s s ⎟+ ⎠ ⎞ ⎜ ⎝ ⎛ = × × − × × − 9−10 0.3 2 0.1 4.879 3.2 3 1 (1) where Kwb – Kilowatts per metric ton of balls D – Mill diameter inside liners in meters Vp – Fraction of mill volume loaded with balls fCs – Fraction of critical speed Ss – Ball size factor To determine the power that a dry grinding ...
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The first two Grinding Efficiency Measurement examples are given to show how to calculate Wio and Wioc for single stage ball mills. Figure 1. The first example is a comparison of two parallel mills from a daily operating report. Mill size 5.03m x 6.1m (16.5′ x 20′ with a ID of 16′).
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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. Empty the mill charge and sand into the ball try once grinding is complete. Clean out the mill using a brush. Put the lid on the mill.
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Ball Mill Design leftpanel. 0. SITUATION : Ore Work Index, kWh (net)/metric ton : Based on Net Power Available. Feed Size, F80, microns : Product Size, P80, microns : Total Plant Throughput, ton/hr : Specific Energy, kWh/ton : Obtained from Bond's Third Law of Comminution ...
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Multi-compartment ball mills and air separators have been the main process equipments in clinker grinding circuits in the last 100 years. ... Vertical roller mills have a lower specific energy consumption than tumbling mills and require less space per unit and capacity at lower investment costs. ... (2,126 kW) is the average operating mill ...
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Typically, the specific energy necessary to reduce the feed material to the desired product size varies in the range of 5–50 kWh/t. Therefore, it is important to have …
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If P is less than 80% passing 70 microns, power consumption will be. Ball Mill Power Calculation Example. A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work ...
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The bond work index for a mesh-of-grind of 200 mesh for a rock consisting mainly of quartz is 17.5 kWh/ton. How much power in kW is needed to reduce the material in a wet-grinding 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: 142.88 Could you please show the solution?
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For the ball mill grindability test, the work index is calculated from the following revised equation (in short tons): where: Pi = sieve size tested (microns) Gpb = ball mill grind ability Wi, P & F have the same meanings as in the top equation. Equipment required: Laboratory ball mill, 34.02 cm x 34.02 cm with following ball charge: Agitator ...
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The specific energy consumption for farine production is determined to be 24.75 kWh/ton farine. The use of an external hot gas supply provides 6.7% reduction in energy consumption corresponding to a saving of 1.66 kWh per ton of farine production. ... Optimization of a fully air-swept dry grinding cement raw meal ball mill closed circuit ...
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Reengineering the flotation circuit reduced the powerconsumptionfrom55 kWh per metric ton ... ball mills (600 kW). The roller press discharge cake is wet screened over a screen (of 3.6
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Learn about the design, operation and selection of ball mills in mineral processing. Find out how to calculate the number of balls required in a ball mill based on the charge volume and media characteristics.
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Feed and product size distribution of a ball mill are given in the following table, Work index (Wi) of the ore ground is 12 kWh per ton, Calculate the energy required for this size reduction, If the capacity of the mill is 150 t/h, what would be the power consumption in the mill? (20 pnts) Mill Feed Wt, Size fractions (um) (%) +500 2,60 -500 ...
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This paper examines the effects of changing mill filling degree with respect to specific power consumption (kWh/ton) and product throughput as well as the impacts …
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Therefore Tons/hour = 3000/20 = 150 tph. Average kWh/ton of material ground = 2608/150 = 174 kWh; Power consumption per ton of clinker with a conversion ratio for consumption 1.55 : 1 = 17.4 x 1.55 = 27 kWh/ton; Using 4% gypsum – 1 ton clinker = 1.04 tons of cement; Therefore power consumption per ton of cement = …
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FOR SALE 60 Ton Per Hour Ball Mill3.4M Dia x 6.5M Long x 1,150 kW, located in Perth, Western Australia. For further information, click here or contact us at 0421 373 166.
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