Table of ContentsBall Mill Load Detection SchemeNew feed rate controllerGrind index control strategyBall mill transport index control strategySump level controllerWater flow controller Figure 4 is a schematic diagram of a ball millcyclone control system. This diagram shows the instrumentation and the calculated variables used in the control strategies. The prior detailed process analysis
Metallurgical ContentOpen Circuit GrindingClosed Circuit GrindingGrinding Circuit Process Control VariablesGrinding Operating Costs The simplest grinding circuit consists of a ball or rod mill in closed circuit with a classifier the flow sheet is shown in Fig. 25 and the actual layout in Fig. 9. This singlestage circuit is chiefly employed for coarse grinding when a product finer than 65
Table of ContentsBall Mill Load Detection SchemeNew feed rate controllerGrind index control strategyBall mill transport index control strategySump level controllerWater flow controller Figure 4 is a schematic diagram of a ball millcyclone control system. This diagram shows the instrumentation and the calculated variables used in the control strategies. The prior detailed process analysis
Costea et al. described a theoritical control system architecture for cement finish grinding. Proposed control system, adjusts fresh feed based on four input variables to the fuzzy controller 18 .
The control strategy achieves and maintains the high production rates within these constraints through the adjustment of the manipulate variables. In the grinding circuit the manipulate variables are the rod mill feed rate, the rod mill water addition rate, and the cyclone dilution water addition rate.
Grinding control strategy on the conventional milling circuit With the increase in ratio set point, a decrease in Cyclone 1 particle size is required. This control loop will increase the water to the sump to cause a decrease in cyclone overflow particle size. Circulating load control The only manipulated variable available in the closed milling
Hence, a close control of grinding circuits is extremely important in order to save energy losses and to improve the efficiency of downstream processing. Many research papers have been published on the development of control strategies for grinding circuits , , , , . Controlling the performance of a closed circuit ball mill is a challenging
Advanced Grinding Circuit Control Using Online Analyzer Systems Grinding circuit efficiency is pivotal to the performance of ore beneficiation. However, establishing stable operating conditions to maximize throughput, energy efficiency and ensure optimal particle size is a challenging task for any grinding circuit.
The optimal control strategy was evaluated at Coln concentrator in two grinding circuits No. 7 and No. 10. The control variables are the particle size at the hydrocyclone overflow and the solid concentration at the hydrocyclone underflow discharge, while the manipulated variables are the setpoints of the fresh feed rate controller and dilution rate and the sump water flowrate controller.
9. A Dynamic Simulator for the Evaluation of Grinding Circuit Control Strategies, K. Rajamani and J. A. Herbst, in European Symposium on Particle Technology, eds. 1980. 10. Reviewed Journal, Population Balance Approach to Ball Mill ScaleUp Bench and Pilot Scale Investigations, J. A.
strategy. RulesBased Supervisory Control and Optimization Previously grinding circuit advanced control systems have been limited by the available implementation platform technology. Plant owners could select expert system approaches or model based approaches but due to technology limitations could not combine the two.
In this study, a fuzzy logic selftuning PID controller based on an improved disturbance observer is designed for control of the ball mill grinding circuit. The ball mill grinding circuit has vast
Abstract. An improved control strategy is proposed to control ball mill grinding circuits for energy saving and pollution reduction. A twolayer optimization architecture combined by particle size optimization layer and energy optimization layer is developed, where the optimal particle size setpoint is calculated first, followed by the energy optimization step.
Duval Grinding Circuit Control Duval Corporation is implementing computer control of its singlestage ball mill grinding operation in the Sierrita mill using a hierarchical approach. The mill is split into two sections of eight mills, each with a PDP 1134 satellite computer operating under Decnet, being used for the first level of control in
and best practice control strategies for grinding circuits. This template is used as a starting point in the design of the logic for a site, and is adjusted and changed according to site specific goals and requirements. HYBRID CONTROL Control of grinding operations can be further enhanced with Model Predictive Control MPC. SGS approach is to
Dynamic simulation of grinding circuits. The application of developments in instrumentation combined with improved control strategies will lead to improvements in process efficiency resulting
to advanced control strategy implementation. The development of a dynamic simulator, based on firstprinciple models, provides an opportunity for comprehensive investigations of a system. Grinding Circuit Simulator The Grinding Circuit Simulator at Cannington has enabled further process understanding, controller design and prototyping, as well
In this case, the primary grinding stage in a concentrator comprises a rod mill in open circuit and a semiautogeneous mill in closed, circuit with a hydrocyclone classifier. All the measurements have computer interfaces and all the control circuits have been implemented by the process control computer. The crushed ore feed to the rod mill is measured by a beltweigher and controlled by a belt
An improved control strategy is proposed to control ball mill grinding circuits for energy saving and pollution reduction. A twolayer optimization architecture combined by particle size
grinding circuit to the next level with a grinding control strategy which is applied consistently. It is like having your best operator every shift While recommending key instrumentation and minimising complex control platforms, our plant experience has demonstrated that gains can often be made merely by using what you have in a better way. We
ball mill using a conveyor belt. The ball mill grinding circuit is illustrated in Figure 2. Solids 78.9 Circulating Load 474 Advance Control Optimizer Manual Mode Preset Output Alarm Summary 6 Mills Display Group Display sump level 86.4 13.1 AMPS Primary Ball Mill No. 5 Solids, Flow GPM 66.7 1.72 9.1 SGU PSI 35.5 PSM 28.6 65 32.6
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