An Expert System for Control of a Sag/Ball Mill Circuit,
01-08-1992· As a counter to this a computer system to provide effective expert help to operators of semi-autogenous (SAG) grinding mills has been developed. This support system is called HelpSAG. It was initially developed for a SAG/ball mill grinding circuit onSAG Mill Expert System Grinding Circuit - 911 Metallurgist,13-10-2017· The expert system had to maintain a consistent cyclone feed density, between 54 and 56 percent solids, in order to maximize cyclone throughput. The cyclone feed density also directly impacted the ball mill loading and the thickener underflow density (the final product of the grinding operation – the C.l.L. feed).Expert mill control at AngloGold Ashanti,The expert control system has evolved to consider the condition of the entire milling circuit, whereas the PID controller would only maintain the set-point of the unit to which it has been assigned. The expert system therefore assesses the degree of optimized behaviour, and allows for interaction to correct for deviances, and more importantly,EXPERT SYSTEMS IMPLEMENTATION AT PEÑOLES GROUP,utilizing two ball mills. The SAG/Ball Mill Circuit has an overall processing capacity of 2300 TPD. A 20.0 ft x 7.5 ft, 1500 HP fixed speed SAG Mill is fed with ore coming from four feeders. As a result of the natural size segregation occurring on the feed stockpile, the feeders can be utilized by the expert system toSAG Mill Grinding Circuit Design - 911metallurgist,06-06-2016· By combining with SAG discharge and screening on the SAG discharge screens, top size control to the ball-mill circuit feed is maintained while still unloading the SAG circuit (Mosher et al, 2006). A variant of this method is to direct pebble-crushing circuit product to the ball-mill sump for secondary milling: while convenient, this has the disadvantage of not controlling the top size of feed,EXPERT SYSTEMS IMPLEMENTATION AT PEÑOLES GROUP CONCENTRATORS,CIRCUITS DESCRIPTION PRIMARY BALL MILL CIRCUIT. A flowsheet of the primary ball mill circuit is shown in Figure 1, indicating . the various control loops and process measurements available to be utilized by an expert system. The circuit consists of two identical . primary ball mills running in parallel with an overall processing capacity of,
SAG Mill Optimization using Model Predictive Control
Control of -SemiAutogenous Grinding(SAG) 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 production (Powell, M.S., van der Westhuizen, A.P., & Mainza, A.N. 2009).INCREASE THROUGHPUT, REDUCE ERROR AND STABILIZE CIRCUITS,,technology. Installations in primary ball mill circuits and SAG/Ball Mill circuits have often witnessed throughput increases from 5-6% and realised expert system utilisation higher than 90% for the time the grinding circuit was available for advanced control operation. PRIMARY BALL MILL EXPERT STRATEGY A ball mill control strategy first determinesSmartMill - Grinding | ABB,Combine ABB's variable-speed drive system with advanced process control - ABB Ability™ Expert Optimizer for grinding - to provide maximum mill control. It can be applied to new or existing AG, SAG and ball mills, powered by either ring-geared mill drives (RMD) or gearless mill drives (GMD).Process optimization using real time tracking of coarse,,01-06-2015· The Rio Tinto Kennecott concentrator uses an Emerson Delta V distributed control system (DCS) for its regulatory process control. The Metso-Cisa Expert system is used for the advanced process control in the grinding circuit., grinding efficiency by utilizing more of the installed grinding circuit power (SAG mill plus ball mill).OPTIMISATION OF ASANKO’S OBOTAN SABC CIRCUIT,31-08-2018· nameplate of 3 Mt/a. The flowsheet is a conventional SAG, ball mill and pebble crusher (SABC) with gravity gold. and carbon-in-leach (CIL) recovery. The nameplate production was comfortably achieved within 3 months, so much so, that it was clear the SABC circuit was capable of processing more than the downstream section. of the plant.Grinding control strategy on the conventional milling,,milling circuit consists of a rod mill followed by a ball mill in series. Crusher product (-9 mm) is fed to the rod mill, and the water is fed in ratio to the ore feed mass. The rod mill discharge is pumped, without any further water addition, to the first ball mill. The ball mill discharges to a sump where water is
SABC Grinding Circuit Operation & Optimization
02-09-2015· SABC Grinding Circuit Operation & Optimization. When operating a grinding circuit (at Granny Smith ) under a wide range of conditions: campaigning very competent underground ore followed by soft oxide, primary versus secondary crushed feed and finally single-stage SAG and conventional SAG, ball mill and pebble crusher (SABC) configurations.Optimisation of a Fully Autogenous Comminution Circuit,66 % reduction in power and a 40 % reduction in load. These are the main controlled variables of the mill. The controller also managed to reduce its objective function, e ective power utilisation, by 11 %. This stability improvement enabled a test campaign where the mill was controlled at various operating regions in order to establish the,SmartMill - Grinding | ABB,Combine ABB's variable-speed drive system with advanced process control - ABB Ability™ Expert Optimizer for grinding - to provide maximum mill control. It can be applied to new or existing AG, SAG and ball mills, powered by either ring-geared mill drives (RMD) or gearless mill drives (GMD).Process optimization using real time tracking of coarse,,01-06-2015· The Rio Tinto Kennecott concentrator uses an Emerson Delta V distributed control system (DCS) for its regulatory process control. The Metso-Cisa Expert system is used for the advanced process control in the grinding circuit., grinding efficiency by utilizing more of the installed grinding circuit power (SAG mill plus ball mill).OPTIMISATION OF ASANKO’S OBOTAN SABC CIRCUIT,31-08-2018· nameplate of 3 Mt/a. The flowsheet is a conventional SAG, ball mill and pebble crusher (SABC) with gravity gold. and carbon-in-leach (CIL) recovery. The nameplate production was comfortably achieved within 3 months, so much so, that it was clear the SABC circuit was capable of processing more than the downstream section. of the plant.The operating principle of the ball mill - energosteel,08-02-2017· The operating principle of the ball mill consists of following steps. In a continuously operating ball mill, feed material fed through the central hole one of the caps into the drum and moves therealong, being exposed by grinding media. The material grinding occurs during impact falling grinding balls and abrasion the particles between the balls. Then, discharge of ground material performed,
Fuzzy Logic Self-Tuning PID Controller Design for Ball,
01-07-2019· In this study, a fuzzy logic self-tuning 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 applications in the mining, metallurgy, chemistry, pharmacy, and research laboratories; however, this system has some challenges. The grinding circuit is a multivariable system in which the high,Demand Side Management of a Run-of-Mine Ore Milling Circuit,Figure 1: ROM ore milling circuit adapted from Coetzee et al. (2010). 2. ROM ore milling circuit 2.1. Introduction The ROM ore milling circuit (see Fig. 1) used for this study consists of a semi-autogenous (SAG) mill, a sump, and a hydrocyclone. Grinding occurs within the SAG mill using steel balls and the ore. Water is pumped into theFlexible milling and grinding solutions that last | FLSmidth,For the mining industry, our semi-autogenous (SAG) grinding mill uses a minimal ball charge in the range of 6-15 percent. It is primarily used in the gold, copper and platinum industries as well as in the lead, zinc, silver, and nickel industries. Autogenous (AG) grinding mills involve no grinding media as the ore itself acts as the grinding media.Optimisation of a Fully Autogenous Comminution Circuit,66 % reduction in power and a 40 % reduction in load. These are the main controlled variables of the mill. The controller also managed to reduce its objective function, e ective power utilisation, by 11 %. This stability improvement enabled a test campaign where the mill was controlled at various operating regions in order to establish the,A Dynamic Simulator for Evaluating Control Schemes in an,,"A review of the dynamic rod mill-ball mill grinding circuit simulator developed at the University of Alberta, highlighting the modular structure and open-ended design, demonstrates the ease with which classical feedback control strategies can be designed and implemented.ECCN list ; Export Control Classification Number,Control systems, on-line development of gas turbine engines . 9B002 . 9B619.a Control units for metallurgical melting & casting furnaces . 2B227 . Controllable-pitch propellers . 8A002.o.2.a . Controlled atmosphere melting & casting furnaces . 2B227 . Controlled environment (vacuum or inert gas) induction furnaces . 2B226
