Linear Model Predictive Control (MPC) continues to be the technology of choice for constrained multivariable control applications in the process industry.
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Jan 01, 2008 Reference Coetzee and Craig, 2007 L.C. Coetzee and I.K. Craig. Robust MPC of a run-of-mine ore milling circuit. In 7 t h IFAC Symposium on Nonlinear Control Systems, 21–24 August, pages 904-909, Pretoria, South Africa, August 2007.
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Aug 01, 2015 One of Palabora Mining Company’s operations had six parallel milling circuits consisting each of a rod mill followed by a ball mill in open circuit (du Plessis, 2001). It reported 0.9% gain in recovery, as well as a throughput gain, using an in-house MPC designed to either reduce particle size for a given throughput, or increase throughput for a given particle size.
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Request PDF | Development of a model predictive controller for a milling circuit | Milling circuits are known to be difficult to control. In order to address these difficulties, it was decided to ...
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Dec 01, 2014 The economic performance of PID control compared to nonlinear MPC when applied to a grinding mill circuit was evaluated by Wei and Craig and results showed that nonlinear MPC (NMPC) can improve performance with respect to recovered mineral value in downstream flotation circuits.
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Jun 01, 2013 The control of milling circuits using model predictive control (MPC) has however been shown to be effective (Chen et al., 2007, Chen, Li, & Fei, 2008, Coetzee et al., 2010, Muller and De Vaal, 2000, Niemi et al., 1997, Ramasamy et al., 2005). Traditionally the control objectives for a ROM ore milling circuit can be given as (Craig and MacLeod ...
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Model predictive control on a process line Implementation of MPC solutions on sequential units in a processing plant delivers overall optimization in addition to the control and optimization of individual units. Consider the example of a milling and flotation plant where the …
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The grinding circuit consists of single-stage AG milling in closed circuit with cyclones and pebble crushers. The run-of-mine ore is hard, and is likely to get harder with depth, this being a major factor in the decision to use AG mills rather than SAG mills—which might have high media and liner costs.
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In the figure below, the range of expected throughput for different ore types are plotted for a fixed grinding circuit; each ore type can process between 80% and 120% of the design throughput. An alternate power model was used to estimate mill throughput using the same mill sizes.
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Oct 01, 2009 As an example, a milling circuit technician controlling particle size distribution would manipulate two handles, the mill throughput and speed as well as …
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Certificate of merit for paper published in the Journal of the South African Institute of Mining and Metallurgy (2004) ... University of Pretoria (2002) Mintek Achievement Award for “Process control of ROM milling circuits” (1992) ... I.K., Model-plant mismatch detection and model update for a run-of-mine ore milling circuit under model ...
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Most of these circuits are controlled only by PID controllers. With the HIL platform, it was possible to simulate actuators and sensors, in addition to allowing the development of a supervisory model predictive controller (MPC) to generate remote setpoints (SP) for the PID controllers using the industrial control blocks built into the DCS.
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Soft Constrained Mpc Applied To An Industrial Cement-10-18from step response experiments to ball mill grinding. lestage et al. discussed the combination of real-time optimiza-tion and model predictive control for an ore grinding circuit. this paper is organized as follows. section 2 reviews the soft mpc …
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Mining automation systems today typically control fixed plant equipment such as pumps, fans, and phone systems. Much work is underway around the world in attempting to create the moveable equivalent of the manufacturing assembly line for mining. This technology has the goals of speeding production, improving safety, and reducing costs.
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milling in mines process control design,grinding in ball mills: modeling and process controlmathematical models and control methods are developed and applied in practice. in this paper we provide a brief survey of the basic princi ... circuits the journal of the south african institute of mining and metallurgy january/february 1999 15 table i ...
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used for grinding with a great deal success in the mining industry, and in particular there has had some limited success of advanced control in alumina industry [4,5,6]. Application of MPC to Grinding Grinding/milling is good area for application of MPC because of ... optimization of the mud washing circuit is well matched to MPC, given that ...
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Jun 06, 2016 SAG Mill Circuit Sampling. Many mills have been built based on data from inadequate sampling or from insufficient tests. With the cost of many mills exceeding several hundred million dollars, it is mandatory that geologists, mining engineers and metallurgists work together to prepare representative samples for testing.
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many mining sites, e.g., Chile. Comminution circuits with HPGRs. The multiple benefits of including an HPGR mill in communition circuits has operators looking to combine them with other types of mills in order to optimize the total specific energy con-sumption of a …
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The tertiary product is stored in a 20,000 t fine ore bin ahead of the ball milling circuit. Fine ore is reclaimed from the bin via eight reclaim belt feeders (two per four parallel milling trains) and delivered to the fine screens ahead of ball milling. Each line consists of two screening units.
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Soft Constrained Based MPC for Robust Control of a Cement ... Dec 20, 2013 ... soft output constraints for regulation of a cement mill circuit. The MPC is first tested ... in either open or closed circuit and with or without pre- grinder, to ... multi-loop PID controllers and linear predictive controllers. (Chen et …
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Purpose of a dynamic separator in cement mill circuit Products. As a leading global manufacturer of crushing, grinding and mining equipments, we offer advanced, reasonable solutions for any size-reduction requirements including, Purpose of a dynamic separator in cement mill circuit, quarry, aggregate, and different kinds of minerals.
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Oct 10, 2016 This paper explores the way two typical model predictive control structures could be combined, and what are the benefits of doing so. Use is made of existing linear dynamic models of plants the authors have… In the metals and mining industry, an ore-milling step followed by froth flotation is a very common processing route.
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