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Gross power = 265 + 1.26 × (2,233 + 215) = 3,349 kW. The conversion between motor input (gross) power and mill shell power, described earlier, is 0.931. Therefore, the predicted power at the mill shell is 3,119 kW, which is 71 kW less than the measured shell power (3,190 kW), a difference of 2%.
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In this paper, the author presented a simple and sound approach to determining the preliminary SSSAG mill. aspect ratio. The approach is based on the concept of ball milling job to be done in a ...
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A data set of mill operating data is collected from published information and compared to predictions made by two published mill power draw models for SAG mills (Austin's SAG model and Morrell's C-model). A third model (Hogg and Fuerstenau) is fit to each survey and the principal fitting parameter is tabulated. Power measurement
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Then in ball-wear formula (25), T = 6.9/K Log10 Da/Db; but from (29), K = Rt/Wt. Then T = 6.9Wt/Rt Log10 Da/Db T is 1 day, Wt is the original weight of the ball charge, and Rt is the ball wear for one day. Then Log10 Da/Db = Rt/6.9Wt are all known, and it is only necessary to solve for Db, the diameter of the balls to be added.
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The pulp densities around your cyclone are sampled and known over an 8-hour shift, allowing to calculate corresponding to circulating load ratios and circulating load tonnage on tons/day or tons/hour. This is %Solids/Densities Based Circulating Load Calculation Method obtained from the pulp/slurry around your hydrocyclone. Cytec …
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Gross power = 265 + 1.26 × (2,233 + 215) = 3,349 kW. The conversion between motor input (gross) power and mill shell power, described earlier, is 0.931. Therefore, the predicted …
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Here, the mill fraction of critical speed is the ratio of the actual speed of the mill to the critical speed, and the empirical formula [25] of the critical speed of the SAG mill is: (14) n 0 = 42.3 D where, D is the inner diameter of the drum and the unit is m, n 0 is the critical speed of the mill and the unit is rpm.
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The approach developed takes into account the ore characteristics (hardness and particle size distribution), the circuit configuration (with or without pebble crusher; with or without …
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To obtain the optimal rotation speed of the SAG mill, we must calculate the motion of the particles and balls accurately. Discrete element method (DEM), which can provide dynamic information of individual particles and handle multiple particle contacts [ 15 ], has become an important tool for conducting research on large scale equipment in ...
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MODEL PREDICTIVE CONTROL OF SAG WEIGHT. The MPC controller was installed to control the SAG mill weight, the belt weight in the ore feed system, and the SAG mill …
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SAG Calculator. View All Technical Tools. ... Paraxial approximation is good for $ tfrac{D}{2}<
things. It is incorrect to say, for example, "the ball mill work index is 13 kWh/t and the SAG mill SEC is 5 kWh/t, so the total circuit energy is 18 kWh/t." This example is a real discussion that one of the authors had with a flotation engineer who was confused because of the convention of using the same units for both quantities.
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The modeling and simulation of semiautogenous (SAG) mills have been widely used in the design and optimization of mill performance in terms of its power draw, processing capacity and product size distribution. However, these models are solved under steady approximation and do not provide any information on mill charge distribution in real time.
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A typical calculation is given in the following example: Example I. Feed Rate: 240 Dry STPH; Feed Size: All passing 8″ Product Size: All passing 6 mesh with 80% passing 20 mesh. Net power from pilot plant: 16.5 KWH/ST; Mill, gear and pinion friction multiplier: 1.025; Mill Power required at … See more
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Power Calculation Formula Of Sag Mill 65 ... circulating load in roll mill ... recirculating pressure in cement mill gmecrusher SAG Mill Load Control; Mill Power Indiion; Cyclone Pressure; ...
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WebJul 18, 2007 formula for the cylindrical section of a SAG mill is as follows. 2.3 KW = 0.0049 x Cs x PCF x D x L x Vp (1- 0.87 Vp) (Equation 1) KW = SAG mill power draw at the pinion, kW Cs = fractional critical speed PCF = mill charge density, pounds per cubic foot (see the further calculations below) D = mill diameter, average inside ...
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Based on experience, mill-liner designs have moved toward more open-shell lifter spacing, increased pulp lifter volumetric capacity, and a grate design to facilitate maximizing both pebble-crushing circuit utilization and SAG mill capacity. As a guideline, mill throughput is maximized with shell lifters between ratios of 2.5:1 and 5.0:1.
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When the assay formulas are used and screen analyses constitute the assay it is wise to calculate the per cent, circulating load for more than one size and use the average figure; in taking the average, reject all …
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The calculations used for each mill group are shown in the Appendix as are ... For SAG mills the equation becomes Power=(5.6115+%balls*0.1438)*D24. 6* L Mill Critical speed Crit Crit D = 42.3 ... Formula assumes that a proportion of one …
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The modeling and simulation of semiautogenous (SAG) mills have been widely used in the design and optimization of mill performance in terms of its power draw, processing capacity and product size distribution. However, these models are solved under steady approximation and do not provide any information on mill charge distribution in …
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To participate in the 911Metallurgist Forums, be sure to JOIN & LOGIN; Use Add New Topic to ask a New Question/Discussion about Grinding.; OR Select a Topic that Interests you.; Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent). Using Add Reply allows you to Attach Images or PDF files and provide a more complete input.; Use …
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The SAG mill model by proposed by Leonard Austin (1990) was largely based on modifications of earlier tumbling mill models by Hogg & Fuerstenau and F. Bond. The model uses a kinetic-potential energy balance to describe the power draw of a mill charge. ... 2013 instead of the formula proposed by Austin. Percent solids. The model is run with …
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A SAG mill, or semi-autogenous grinding mill, operates on the principle of autogenous or self-grinding. It uses a combination of ore and grinding media to break down larger rocks into smaller pieces. Understanding the working principles of a SAG mill is crucial for anyone involved in the mining industry. In this section, we will delve deeper ...
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The catenary constant is effectively the ratio of the horizontal tension in the conductor to the unit weight in the absence of wind. where: T = Horizontal component of tension (N) W = distributed load on conductor (N/m) m = unit mass of conductor (kg/m) g = gravitational constant of 9.81 m/s 2.
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In order to obtain the optimal operation parameters of a SAG mill, in this paper, the discrete element method (DEM) is used to simulate the breakage process of …
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Due to its strong lifting capacity and excellent grinding performance, the trapezoidal liner is widely used in the SAG mill. The structure of the trapezoidal liner is shown in Fig. 1, the main dimensions are: dip angle (tau), length of the top edge (L) and height (h).Dip angle (tau) determines the trajectory of the mediums in the SAG mill, …
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The paper also details formulas for calculating the filling level and load volume, which unlike previously published equations, also consider the volume in the conical ends and the volume occupied by the mill shell lifters. ... These equations are expanded to calculate the mass of the SAG mill contents and the proportion of steel …
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A linkedin group was recently discussing this by asking: I've tried to estimate AG/SAG Mill power requirements using several different methods: (1) Using the results of SMC data. (2) Using SAG Power Index (SPI) data. (3) Using the 1989 Barratt method updated on Alex Doll's Web site (February 16, 2015)
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Objectives. Upon completion of this lesson students should be able to: Differentiate between different type metallurgical accounting methods and benefit of metallurgical accounting. Recall the definitions of grade, …
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For complete background information on the derivation of the formulas refer to the article: Allowable Pipe Support Span Calculation. * Input Pipe Outside Diameter (mm) * Input Wall Thickness (mm) * Input Allowable Stress (psi) Use 5000 psi for CS pipes up to 400°F. * Input Modulus of Elasticity (ksi) Use 27700 ksi for CS pipes up to 400°F.
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