Control of Wet Grinding Circuit. Hulbert and Woodbum (1983) present the multivariable control of…

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Control of Wet Grinding Circuit. Hulbert and Woodbum (1983) present the multivariable control of a wet grinding circuit such as the one shown in Fig. P13-2. The controlled variables are the torque required to turn the mill (TOR), the density of the cyclone feed (DCF), and the flow from the mill (FML). These variables were selected on the basis of their importance to the metallurgical process. The torque and flow from the mill describe the operation of the mill, and the density of the cyclone feed describes the operation of the slurry tank. The flow from the mill is not measured directly but is derived from a combination of other measurements and a mass balance around the mill. However, for simplicity, a single transmitter is shown in the diagram. The manipulated variables are the flows of the three feed streams: solids (SF) and water to the mill (MW) and water to the slurry tank (SW). The feed rate of solids to the mill is manipulated by adjusting the speed of the conveyor carrying the solids. Open-loop step tests in each manipulated variable result in the following transfer functions: