optimising a sag mill

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PDF SAG milling at the Fimiston plant KCGM

been implemented on the Fimiston SAG mill which have increased the Fimist on plant throughput from 110 million tpa to 125 million tpa With an increase in the plant throughput the overall...

Experiences and Lessons with Advanced Control Systems for

Jan 01 2009 0183 32 Experiences and Lessons with Advanced Control Systems for the SAG Mill Control in Minera Los Pelambres Daniel A Silva Luis A Tapia Senior Control Eng Automation Department Minera Los Pelambres Choapa Chile 4001 Apoquindo Ave 18th Floor Santiago tel 56-2-7983609 e-mail email protected Concentrator Operations Superintendent Minera...

PDF Load control of ball mill by a high precision

A self-optimizing high precision sampling fuzzy logic controller for keeping a ball mill circuit working stably and efficiently is proposed in this paper The controller is based on fuzzy logic control strategy and a fuzzy interpolation algorithm is presented to improve the control precision The final output of the controller is calculated through the interpolation calculation of the...

Optimising mill circuits for best efficiency impact

Dec 14 2020 0183 32 Among the new solutions acquired is LoadIQ for monitoring and optimising the performance of semi-autogenous SAG mills he says The SAG mill is a key element of many milling circuits today usually located between primary crushing and ball milling phas...

Optimisation and Continuous Improvement of Antamina

2007 Process Technology and Innovation PTI was contracted to increase SAG mill throughput by integrating and optimising blast fragmentation crushing and grinding for the harder M4/M4A CuZn or Following the implementation of recommendations provided by PTI the SAG mill throughput...

PARAMETER OPTIMIZATION OF LARGE SAG MILL LINER BASED

Jun 17 2021 0183 32 Therefore optimizing the liner structure is of great significance for improving the production capacity and economic performance of the SAG mill Discrete Element Method DEM can effectively analyze the kinematics and dynamics of the SAG mill and is an effective method for the structural performance analysis of the SAG mill and the liner...

PDF Maximising SAG mill throughput at Porgera gold mine by

Optimizing your SAG mill operation - International Mining...

FREDA REBECCA SAGMILLING CIRCUIT OPTIMIZATION

the SAG mill amounting to 512 t/h affecting mill capacity as this took space and limited the capacity for new feed Using ModSim simulator incorporation of a 100 micron screen on the cyclone underflow stream was simulated The main purpose of the screen is to reduce the re circulating load...

Optimization of mill performance by using

mill under steady state then cutting off all feed streams to the mill as it is being stopped Sufficient time is required to obtain all the important measurements correctly during the crash stop The mill filling should be measured at a minimum of 3 points along the mill Excess of slurry could also be estimated To get rid of pulp and rocks in...

PDF Maximising SAG mill throughput at Porgera gold mine

Maximising SAG mill throughput at Porgera gold mine by optimising blast fragmentation SAG Mill Breakage Rates 100 SAG Feed Size Distributions 100 90 Survey 1 80 Cum Wt Passing Survey 2 Breakage Rate 70 Survey 3 10 60 Survey 1 SAG 1 50 Survey 1 SAG 2 40 Survey 2 SAG 1 30 Survey 2 SAG...

Increase throughput and capacity in SAG mills

Optimising the capacity of your SAG mill is crucial to avoiding downtime and liner wear and damage With variances in mill ore feed rate mill speed and slurry density critical impacts can occur in your SAG mill The speed at which these variances are adjusted for is thus crucial for minimizing damage and optimizing liner life...

Optimising blast fragmentation potential

354 to 390 Fines content in the SAG feed also increased by 8 Furthermore improved and consistent fragmentation has led to a better particle size distribution in the SAG mill feed and the throughput consequently increased by 23 This led to a decrease of 18 in SAG energy consumption and significant financial savings for the mine...

PDF Optimization of the Sossego SAG mill grinding circuit

Sossego was the first Vale SAG mill operation to process copper-gold ore It is located in Para state south east of Amazon region in Brazil The comminution circuit was designed to treat 41 000...

Implementation of a SAG Grinding Expert System at

Jan 01 2013 0183 32 Beyond the primary benefit of stabilising and continually optimising the SAG mill operation the expert system frees up the operators to focus on maintenance issues as well as upstream and downstream process Through direct involvement in the expert system project the operators have also formed a better understanding of the operation and...

STEPPING FORWARD USING VARIABLE SPEED DRIVES FOR

The breakage rate function shape of the SAG mill is largely governed by the mill load particle size distribution and mill speed The feed in the mill contains fractions of ore that serves as the grinding media Larger ore fractions break the smaller particles but also breakdown themselves and exit the mill...

Optimising mill circuits for best efficiency impact

Sep 13 2021 0183 32 Among the new solutions acquired is LoadIQ for monitoring and optimising the performance of semi-autogenous SAG mills he says The SAG mill is a key element of many milling circuits today usually located between primary crushing and ball milling phas...

SAG mill optimization insights by measuring inside the

SAG mill optimization insights by measuring inside the mill P Shelley I Molina D Patsikatheodorou it is reasonable to think that successfully combining real time data from inside the mill with mill optimizing mathematical models might provide an industry step-change to the efficacy of energy efficient mill optimizationThis paper...

SAG mill wear optimization using DEM simulation

Mar 13 2018 0183 32 Video 1 Mill Showing Surface Wear Modification Case scenario Consider a large SAG mill with a diameter of 1097 m as shown in Figure 1a The mill has a high-definition line design with alternating lines of high and low elevators Figure 1b The mill processes rocks from 200 mm to 300 mm using 350 mm steel balls as the grinding medium...

GMG Event SAG mill optimisation by measuring inside the

Nov 04 2020 0183 32 The paper will show how energy measurements from inside an operating SAG mill are now a reality The paper discusses how the measurements effect and enhance...

Predictive Optimization of SAG Mill Wear Using Rocky

In the mining sector these losses can be particularly large For example a trained professional crew requires between 40 and 120 hours to replace the worn liner of a Semi-Autogenous Grinding SAG mill with each hour costing between 30 000 to 200 000...

Unlocking additional value by optimising comminution

Apr 01 2017 0183 32 The SAG mill throughput improvement obtained from GE impacted mill feed also suggests that the proportion of critical size is not significantly altered and that the major change results from the fraction lower than 20 mm a size fraction typically characterised for having limited residence time in SAG milling less than grate size See...

Predictive Optimization of SAG Mill Wear Using Rocky

In the mining sector these losses can be particularly large For example a trained professional crew requires between 40 and 120 hours to replace the worn liner of a Semi-Autogenous Grinding SAG mill with each hour costing between 30 000 to 200 000 USD and...

Multotec looks to optimise SAG mill liner performance

Mar 18 2021 0183 32 Multotec looks to optimise SAG mill liner performance milling efficiency and liner life Posted by Daniel Gleeson on 18th March 2021 As the mining industry moves to larger semi-autogenous grinding SAG mills for higher productivity Multotec says it is developing and applying innovative liner designs to optimise liner performance mill...

PDF Blast fragmentation for maximizing the SAG mill

Maximising SAG mill throughput at Porgera gold mine by optimising blast fragmentation By Walter Valery Alex Jankovic and S Kanchibotla Batu Hijau Model for Throughput Forecast Mining and Milling Optimisation and Expansion Studies Newmont Mining Corporation...

how does the sag mills operate in the mining plant

Optimizing your SAG mill operation - International 2007-3-21 In multi-stage ABC/SABC circuits the AG or SAG mills are in closed circuit with screens and pebble crushers The mill discharge from these mills consists of slurry which goes to the ball mills for further grinding and coarse pebbles/rocks which are crushed and sent back to the mill...

Optimizing Performance of SABC Comminution Circuit of the

the SAG mill and ball mill was 8658 kW which caused partial over-grinding From experience in processing plants outside of China the power rating of the ball mill should be higher than that of the SAG mill 5 The pebble crusher had an over-powered configuration The installed power draw of 630 kW...

Optimization of a SAG Mill Energy System Integrating Rock

Jul 01 2019 0183 32 An optimization is carried out to minimize the yearly cost of energy for the operation of the SAG mill This cost includes the energy consumption cost in /kWh and the capital cost for the PV-BESS infrastructure prorated over the life of the battery system accounting for the discount rate through an annuity factor Pamparana et al 2019a b The energy requirements are defined by the SAG...

Grindin at the Mill

Mill throughput is a key driver for maintaining profitability at Mt Keith because of the low head grade 05 Ni and inherently low nickel recoveries due to the mineralogical makeup of the ore The Nickel West Mt Keith Concentrator NMK has 2 parallel grinding modules consisting of one SAG Mill and one BALL Mill per module...

Performance Characteristics and Optimisation of the

by the installation of a 12MW SAG mill with a diameter of 1097m 36ft The mill when built was the largest SAG mill operating at any existing Australian mine To aid in commissioning and optimising the mill the Julius Krutt- schnitt Mineral Research Centre JKMRC and plant staff con- ducted extensive surveys of the grinding circuit...