Sag Mills Optimization

SAG Mill Optimisation and Increasing Throughput at the Phu Kham Copper-Gold Operation Dr Rajiv Chandramohan –Mill Ops 2018 Robert Braun, Greg Lane, Kirsty Hollis, Johnson Le, Dirk Baas. Mill Operators' Conference 2018 29 –31 August 2

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The paper shows how measurements from inside an operating SAG mill are now a reality. The paper discusses how the measurements might affect and enhance energy efficient mill optimisation. Energy efficient comminution is a pre-occupation of mineral processing researchers and practitioners.

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Mill filling is an important operational parameter in a SAG mill circuit and by its control and optimisation it can produce significant improvements in production capacity and energy efficiency. However, it is industry practice to report mill load as the total output given by load cells, or kPa for systems based on lubrication bearing back pressure, rather than the actual percent …

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These studies have been important in a coordinated optimization program for mill heads, shells and trunnion bearings. Mill Shells require a similar but more complicated program for stress and deflection analysis. Often, depending on the load concentration and mill …

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2.1 SAG mill modeling In MODSIM, one of the simulation models used for a SAG mill unit is SAGT (Semi-Autogenous Grinding with Trommel) model. In this model, a SAG mill with a trommel screen at mill discharge is modeled using the full population balance including particle attrition and wear (King 2001b). In this

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Boost and protect your SAG Mill. Our total process control and optimisation system will lower energy usage while increasing production and extending the life of liners It's a cost-efficient way to significantly lift the performance of your mill operations.

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The biggest characteristic of the sag mill is that the crushing ratio is large. The particle size of the materials to be ground is 300 ~ 400mm, sometimes even larger, and the minimum particle size of the materials to be discharged can reach 0.1 mm. The calculation shows that the crushing ratio can reach 3000 ~ 4000, while the ball mill's ...

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predicting liner wear and fine-tuning optimum conditions for SAG mill operation. CASE SCENARIO Consider a large SAG mill with a diameter of 10.97 m, as shown in Figure 1a. The mill has a hi–lo liner design with alternating rows of high and low lifters (Figure 1b).The mill processes rocks of 200

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Most hard rock operations have reported pebble recycles above 10% of SAG mill feed (Powell et al. (2006). Cadia Hill SAG milling circuit reported pebble recycle of 34% of feed (Hart et al., 2001 ...

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The performance of tumbling mills is sensitive to the volumetric mill filling which influences grinding media wear rates, throughput, power draw, and product grind size from the circuit. Each of these performance parameters peaks at different filling values. In order to contin-uously optimize mill operation, it is vital to

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Rocky DEM helps predict liner wear and fine-tuning optimum conditions for SAG mill operation. No one in industry is happy with downtime losses incurred due to a machine that won't operate. 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 ...

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Ø Recycle crusher availability was lower than that of the SAG mill. Ø SAG mill availability was lower than expected in the first year due to issues with the gearless drive and trommel panel failures. Figure 1 shows the ramp up of the Cadia Hill SAG mill by quarter. Throughput and availability are presented compared to the target or design basis.

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The biggest characteristic of the sag mill is that the crushing ratio is large. The particle size of the materials to be ground is 300 ~ 400mm, sometimes even larger, and the minimum particle size of the materials to be discharged …

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The one sound operators do not want to hear is the sound of the mills standing still. A gold-processing plant, I visited recently valued their SAG mill downtime at US$ 130,000 per hour, so extending the life and availability of mill liners is …

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SAG mill wear optimization using DEM simulation Rocky. Mar 13 2018 SAG mill wear optimization using DEM simulation Published on March 13 2018. Avoiding machine stoppage is a continual challenge in the mining industry since downtime hours cost valuable production time and money. In the case of semi-autogenous SAG mills these losses can be excessive.

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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 liner parameters. Introduction

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Often used in grinding at modern mineral processing plants, SAG mills reduce the material directly to the desired final size or prepare it for the following grinding stages. Lower lifetime cost Simpler process requires lower capital and maintenance costs. Versatile applications Wide range of mill sizes available.

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page 233 sag mining and mineral process engineering, ubc vancouver, b. c. canada performance characteristics and optimisation of the fimiston (kcgm) sag mill circuit. Chat Online; Optimization of the Sossego SAG mill grinding . MINERAÇÃO . Estudo de variabilidade e otimização do circuito de moagem SAG da Usina do Sossego . Optimization of ...

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For SAG mill 1, the information is split into 179, 71, and 90 days (8600, 3400, 4340 data points), while for SAG mill 2 the information is ... Ba J (2014) Adam: A method for stochastic optimization. arXiv:1412.6980. Morrell S (2004a) A new autogenous and semi-autogenous mill model for scale-up, design and optimisation. Minerals ...

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Replacing the SAG's worn-out liner can occur every six to nine months and cost between $30,000 U.S. and $200,000 U.S. per hour, and …

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As a result, mines have shifted their emphasis in optimization from ball mills to SAG mills. The rock load in the mill essentially depends on ore characteristics and the discharge rate of broken particles through the discharge end. The discharge rate depends on how efficiently the discharge pump (grate and pulp lifters) operates.

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Sag Mill Optimization Using Model Predictive Control: control of -semiautogenous grinding mill weight is an example of an important process that exhibits many of these aspects. maintaining the sag mill weight at the optimum value is critical for achieving maximum grind rate efficiency and mill productionsag mill optimization work can be carried out remotely, with the …

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@article{osti_895022, title = {ONLINE SAG MILL PULSE MEASUREMENT AND OPTIMIZATION}, author = {Rajamani, Raj and Delgadillo, Jose and Duriseti, Vishal}, abstractNote = {The grinding efficiency of semi autogenous milling or ball milling depends on the tumbling motion of the total charge within the mill. Utilization of this tumbling motion for efficient …

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SAG mill Optimisation and increasing throughput at the Phu Kham Copper-Gold Operation – a success story Watch . Optimising the operation of paste thickening at the Yara Siilinjärvi Plant Watch . Modular SAG mill discharge trommel for maintenance flexibility and performance Watch .

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Figure 3 – SAG mill MPC control strategy - "SAG MILL OPTIMIZATION USING MODEL PREDICTIVE CONTROL" Skip to search form Skip to main content Skip to account menu. Semantic Scholar's Logo. Search 205,549,818 papers from all fields of science. Search. Sign In Create Free Account.

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A stable SAG mill performance enables operations to push the limit to maximize throughput. Control strategy implementation In the above graph, the progress of a well-implemented control strategy is to change from an unstable, highly variable operation to a stable, optimized SAG mill with a responsive controller adapting to dynamic ore and production variability.

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A number of optimization and upgrading measures were taken over the 10 years of operation of the semi-autogenous mill, including changes in the grate area, size and arrangement of aperture, liner profile and rock blasting plan. This work describes the main aspects of the circuit design and the improvements introduced over the first years of ...

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Optimize underperforming assets and remove the need for capital expenditure: Optimal control of the SAG mill can be achieved by using existing DCS or PLC. It is commonly assumed SAG mill control can only be successfully implemented using "black-box" solutions; this is just not true.

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exhibits many of these aspects. Maintaining the SAG mill weight at the optimum value is critical for achieving maximum grind rate efficiency and mill production (Powell, M.S., van der Westhuizen, A.P., & Mainza, A.N. 2009). However, SAG mill weight is difficult to control as the dynamic response changes as the mill approaches maximum capacity.

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Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach. When future tonnage is to be increased, the SAG Mill can feed downstream ball milling to boost capacity. Fuller-Traylor SAG/AG Mills range in size from 4.3m through 12.2m in diameter with powers as high as 28,000 kW.

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• Antamina´sSAG mill has the worst condition of slurry evacuation in trommel: α = 222 m 3/h/m 2 • Esperanza and Escondida´sSAG mills have high values of α, but they have a screen • Trommel of 40 feet SAG mill of Collahuasi has an high value of α = 172 m 3/h/m 2. Open Pulp Free Flow by Free SAG 1011 Area, % Flow, m 3/h Area, m 2 Area ...

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SAG milling can be optimised to achieve maximum breakage and throughput (or any other number of objectives). The relationships between the key variables are highly non-linear and shift as the ore hardness, steel load and liner conditions …

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