01/09/1998· The grinding section operates six ball mills. two in closed loop with hydrocyclones classifiers and four in open loop. Each mill has a 5.18m diameter and a length of 1O.36m. The current project is the advanced control of the closed loop ball mill 'E' with the plant Bailey distributed control system.
01/09/2007· The grinding circuit under study operates in a closed loop as shown in Fig. 1. It consists of a ball mill, a pump sump, hydrocyclones, as well as associated pumps and solids feeding conveyors. Download : Download full size image; Fig. 1.
Open loop is often used for coarse and medium crushing. In the case of the open loop the material passes the milling device only once without repassing it. The best possible product quality level, the lowest power consumption, and the highest milling equipment output are achieved in closed loop with continuous recovery of the fine fraction.
Various open loop simulations are presented to demonstrate the highly interactive nature of the grinding circuit and to indicate where potential control problems may be encountered. Closed loop simulations are examined, beginning with the basic SISO classical feedback control of
01/04/2005· Controlling the performance of a closed circuit ball mill is a challenging problem due to its complex dynamic characteristics and heavy interactions among the control loops. Traditionally, the grinding circuits are controlled by multi loop PID controllers which are heavily detuned to avoid multivariable interactions.
01/06/2012· A typical structure of a closed loop circuit for wet grinding consists of a ball mill, sump and classifier 10, 13, 33, 39 and it is schematically shown in Fig. 4.