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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 power calculation in SAB(C) circuit design
The simplest method would be to use stabdard SAG and ball mill energy calc and then subtract from the total. To calculate SAG and ball mil energy see SDM Mill Calculations: Perform ball, rod, pebble, AG, and SAG calculations (currently in imperial units only). Also calculate gross grinding energy requirements from Bond work index, feed and ...
Pre-Processing to Increase the Capacity of SAG Mill …
7.0 m length (190) single SAG mill equipped with a 20 MW electric motor. The SAG mill product flows to two 3.6 m (120) by 7.3 m (240) horizontal screens, whose combined oversize (pebbles) is diverted to two MP 800 cone crushers. The crushed product returns to the SAG mill feed, closing the primary grinding circuit. The horizontal …
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.
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 ...
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 …
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 …
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 …
sag mill design calculations
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, feed size as F80 and maximum 'chunk size', product size as P80 and maximum ...
sag mill power calculations
LG A mill power equation for SAG mills. Minerals and Metallurgical Processing. Feb 1990 pp57-62. Gross power No load power Net power drawn by the charge (8.13) The net power is calculated from Net power KD2.5L e! c./ Watts (8.14) In equation 8.14, D is the diameter inside the mill liners and Le is the effective length of the mill including the ...
A POWER BASED APPROACH FOR THE SELECTION AND …
mill liners by estimating a mill power draw using simulated ball trajectories inside the mill. The correct selection of liners and mill operation based on the understanding of the relationship between mill power draw and ball trajectory contribute in increasing energy efficiency in the beneficiation of minerals.
Semi-autogenous grinding (SAG) mill liner design and …
SAG mill liner development draws primarily on practical experience from SAG milling operations supported by computer-based modeling of charge motion in SAG mills and on established good design practice. Liner design needs to respond to the process aspects of mill liner action that are critical to good SAG mill performance, i.e.,
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 comminution calculations using Ausgrind …
predictions for different SAG and ball mill-based circuit configurations. Existing power-based calculations for comminution circuits Most modern grinding circuits consist of a primary SAG mill and ...
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 …
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 …
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 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 …
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 …
Demystifying The Sag Mill: What Is It And How Does It Work?
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 ...
power based sag mill design calculations
power calculation formula of sag mill. mining energy saving mining ball mill design calculation. Design and Wear SAG Mill Shell Liners at Brunswick Min CIM Bulletin, Get Price calculation of the power draw of dry compartment ball mills May 6, 2004, In this paper, a new approach for the calculation of the power draw of, right mill for the …
SAG Calculator | Edmund Optics
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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.
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.
(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 ...
AG – Autogenous & SAG Semi-Autogenous Mill …
circuit power requirements for autogenous and semiautogenous milling. The method is widely used by RIVS in extended calcula-tions at early design stages. The article is …
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.
Actual SAG Mill Operating Power | Download Table
Increasing the speed of the mill above the design point of 74% critical speed was also considered but did not result in greater power draw of the mill due to the mill motor design (Dunne et al ...
SAG Mill Liner Design
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 …
Power Based Sag Mill Design Calculations
The engineering and process effects of choosing a motor ... The SAG mill power draw model of Austin (using the cali-bration by Doll, 2013) is used to predict the process power draw at the mill shell, Pshell, and the efficiency losses for the drive's mechanical components based on Doll (2012) are used to determine the motor output …
AMIT 135: Lesson 6 Grinding Circuit – Mining Mill …
SAG Mill Circuit Example — Gold Processing SAG mill circuit example for gold processing [image: (135-6-3)] AG/SAG Mill. AG/SAG mills are normally used to grind run-off-mine ore or primary crusher product. Wet grinding in an AG/SAG mill is accomplished in a slurry of 50 to 80 percent solids. 2D and 3D simulations of particles in a SAG Mill
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 ...
(PDF) Predicting SAG/AG Mill and HPGR Specific Energy
Predicting SAG/AG Mill and HPGR Specific Energy Requirements Using the SMC Rock Characterisation Test. ... 3.3 Power-based Calculations. ... DESIGN OF AG/SAG MILL CIRCUITS USING THE SMC TEST.
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 …
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
Impact on Grinding Mill Design of Recent New Discoveries
SAG hardness. These breakage tests do not include ball mill grinding data. Based on the 2009 CIM paper, the ratio of macro to micro grindability is an important key to achieving a reliable SAG mill design because that ratio reveals the best split for SAG and ball mill energyon that ore.
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 ...
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.