Rod Mill Design Calculations
Rod Mill Design Calculations. EF1 – Dry Grinding – for the same range of work, dry grinding requires 1.3 times as much power as wet grinding. EF2 – Open Circuit Grinding – when grinding in open circuit ball mills, the amount of extra power required, compared to closed circuit ball milling, is a function of the degree of control required ...
Power Based Sag Mill Design Calculations
The collected SAG feed sample was prepared for pilot-scale HPGR and stirred mill testing to determine the key operating parameters for flowsheet design and power-based calculations. Ultimately, the simulation and test results allowed for the direct comparison of the energy and costs for three circuits.
(PDF) Power-based comminution calculations using Ausgrind …
Some design methods (Lane et al., 2013, Morrell, 2004, Siddall & Putland, 2007 predict the total comminution energy requirements of SAG mill-based circuits using work indices measured in ...
Power Based Sag Mill Design calculations
power based sag mill design calculations Ball Mill Design/Power Calculation The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density ...
Power-based modelling of single-stage AG and SAG mill …
The design of such circuits i s complicated by the typical power-based models used f or conceptual design being calibrated to a two -stage circuit with A G or S AG mill product bei ng passed to a
Predicting the specific energy of autogenous and semi-autogenous mills
Power-based calculations The power-based approach to design uses a methodology which, given certain ore breakage characteristics, predicts the specific energy for a particular AG/SAG mill circuit. The multiplication of the specific energy by the target throughput gives the required power draw of the mill.
Research on performance of a laboratory-scale SAG mill based …
1. Introduction. Grinding is an industrial process that accounts for a large proportion of the mineral processing industry [1], SAG mill is the main mining equipment in this link.The main working device of the SAG mill is a drum that is placed horizontally and can be rotated, the lifters are provided on the inner wall of the drum that includes the …
Sag in a Transmission Line: What is it? (And How To …
w i is the weight of ice per unit length. w i = density of ice × volume of ice per unit length. w w is the force of wind per unit length. w w = wind pressure per unit area × projected area per unit length. So, the total weight of the conductor per unit length is. The sag in the conductor is given by.
Operation Analysis of a SAG Mill under Different Conditions Based on
The SAG mill power does not increase with an increase in the mill speed ratio, but when the speed reaches about 85% of the critical mill speed, the power decreases and the mill power increases ...
Predicting the specific energy of autogenous and …
Power-based calculations The power-based approach to design uses a methodology which, given certain ore breakage characteristics, predicts the specific …
SAG/Ball Mill
Gross Power Draw and Specific Energy Calculator for Semi-Autogenous Grinding (SAG) and Ball Mills. Return to Mill Calculators. Shell Sizing Parameters. Parameters. Value . Value . Mill Shell Inside Diameter: [m] ... Mill Power Draw Available. Description. Value Units. Power Draw - At Pinion [kW] Metallurgical Power Requirements Process Data.
power based sag mill design calculations
Power Based Sag Mill Design Calculations. classify the agsag mill product into two products the phantom cyclone overflow that is based sag mill design calculationsA Mathematical Model for the Prediction of Large Diameter . OMC Power-Based Comminution Calculations for Design, Modelli On-Line Flotation Simulator at …
Mill power draw models
The mill power draw models are used to predict how much power will be consumed by a particular type of mill, mill geometry and set of mill operating conditions. This power is transferred to the ore and used to predict the throughput when combined with the specific energy consumption models. Models of this type do not predict the particle size ...
AN UPDATED DATA SET FOR SAG MILL POWER MODEL …
paper will compare the survey database to SAG mill models by Austin, Morrell and Hogg & Fuerstenau with the purpose of demonstrating the degree of fit of the models to surveys and validating any empirical "fitting factors" used in the models. SAG mill power draw models are used in mill design and grinding circuit modelling to predict
THE MORRELL METHOD TO DETERMINE THE …
The Morrell method can be applied for the design and optimization of comminution circuits. The method essentially consists of two parts: • Part 1: Power draw modelling of equipment such as ball mills and autogenous grinding (AG) and semi-autogenous grinding (SAG) mills. • Part 2: Using ore properties to assess the circuit specific energy.
GROSS POWER CALCULATOR
GROSS POWER CALCULATOR General . ... Ball Mill AG/SAG Mill min max min max DESIGN DATA diameter inside shell (m) 0.9 7.9 1.8 12.2 ... the model from grate to overflow when predicting the power draw of an AG/SAG mill. 4 Figure 1 – Measured vs Predicted Motor Input Power . 0 2000
SAG Calculator | Edmund Optics
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SAG Mill Optimization using Model Predictive Control …
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 sound emissions. A diagram of the control strategy is shown in Figure 3. Figure 3 – SAG mill MPC control strategy The MPC SAG weight controller includes measured disturbance ...
SAG Mill Grinding Circuit Design
AG mills (or SAG mills with low ball charges) are often used in single-stage grinding applications. Based on their higher throughput and coarser grind relative to AG …
2022/sbm sag mill power cost calculations.md at main
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Ball Mill Design/Power Calculation
The approximate horsepower HP of a mill can be calculated from the following equation: HP = (W) (C) (Sin a) (2π) (N)/ 33000. where: W = weight of charge. C = distance of centre of gravity or charge from centre of mill in feet. a = dynamic angle of repose of the charge. N = mill speed in RPM. HP = A x B x C x L. Where.
Power Based Sag Mill Design Calculations
will become the predictions. In the case of SAB/SABC circuits the transfer size is the product of the SAG mill circuit and the feed of the ball mill circuit. Hence if power-based equations such as eq. 1 and eq. 2 are to be used to predict the SAG mill circuit and ball mill circuit specific energies it is important to ascertain:
A comparison of SAG mill power models
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 …
Power-based modelling of single-stage AG and SAG mill …
WiRM, the Bond rod mill work index (conducted using a wave-liner mill and a fourteen mesh closing size), unitless (but relative to either a metric tonne or Imperial short ton …
C O N S U L T I N G L T D TECHNICAL MEMORANDUM
EF5BM=[ P80+10.3 1.145×P80] ( 3 ) The EF4 formula requires both the rod mill and ball mill work index (rod mill Wi is used to calculate the optimal feed size) and because this is a "single-stage ball mill" calculation, the F80 is actually the rod mill feed size (10,000 µm) from Table 1 and the P80 is the ball mill circuit product. The EF5 factor only applies …
Modelling SAG milling power and specific energy
Tracking the mill performance showed that the mill power consumption decreased from 9.49 to 6.63 kWh/t (a nearly 30% reduction), P 80 of the mill product decreased from 611 to 355 μm, and the mill fresh feed flow rate increased from 511 to 521 t/h by decreasing the feed ore hardness from 112 min to 58 min based on SAG power …
PARAMETER OPTIMIZATION OF LARGE SAG MILL LINER BASED …
Abstract The authors analyze the influence of the semi-autogenous (SAG) mill parameters on the mill grinding efficiency, energy consumption and the tangential cumulative contact energy. This paper provides a new liner parameter design and optimization method, which offers theoretical guidance for the optimization design of …
SAG mill optimisation using power-based simulations
Ausgrind program improvements include: Mill liner wear and life prediction for any liner/lifter design. SAG mill slurry pooling model to predict the onset and effect of slurry pooling for varying operating conditions. Grinding mill trajectory model to determine safe operating speed ranges based on liner/lifter design.
Modelling SAG milling power and specific energy
Tracking the mill performance showed that the mill power consumption decreased from 9.49 to 6.63 kWh/t (a nearly 30% reduction), P 80 of the mill product …
Power-based modelling of single-stage AG and SAG …
WiRM, the Bond rod mill work index (conducted using a wave-liner mill and a fourteen mesh closing size), unitless (but relative to either a metric tonne or Imperial short ton basis). WiRM = 115 (A×b)-0.57 [based on reinterpretation of Doll, 2016] WiRM = 1.35 (SGI)0.51 [Doll, 2016] WiC, the Bond crushing work index, unitless (but relative to ...