Abstract
The multivariable control that was designed for the grinding circuit in the Siilinjärvi concentrator can control important variables like the final particle size and the density of the cyclone feed. The controller was designed for the plant using an interactive CACSD software package which included the use of the inverse Nyquist array method. The control algorithms designed were implemented in the process control computer at Siilinjärvi and the correlation between the simulated results and the full scale tests in short term experiments was good. Changes in the setpoint of either of the controlled output variables produced satisfactory responses, while at the same time the other controlled output remained close to the designed constant value.The multivariable controller designed has not yet been taken into continuous use at Siilinjärvi. The large variation of mineral components in the ore has caused difficulties in the operation of the particle size analyser. The potential use of the PSM analyser for on-line control in the Siilinjärvi grinding process is discussed in the paper.
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