Leading the way in gold optimisation

July 2001 System Integration & Control Systems Design

Svedala's Cisa division has recently been awarded a contract to install its OCS (optimising control system) to optimise the milling circuits at Gold Fields Kloof No. 1 Gold Plant in Westonaria. This brings the total number of gold plant advanced control applications in southern Africa to four. The other systems are operating at plants in Mali, Tanzania and an Anglo Gold operation in Carletonville. The Sadiola Hill plant in Mali has been using this system to achieve unprecedented peak performance since 1997. This 'greenfields' project has paved the way for the introduction of the OCS in Africa.

Anglo Gold's Mponeng Plant in Carletonville, controls the three milling circuits on this system to achieve a consistent product quality to the required production targets. It uses advanced soft sensor technology to describe the behaviour in the mills that facilitates, amongst other things, the control of the mill discharge density.

This type of control has proved invaluable which has not previously been achieved with other systems or methods. Engineers and operators at the plant have embraced the system allowing it to control the plant on an average of 97% of the total running time. The only time the system is switched into manual control is to allow for major plant equipment maintenance or instrumentation calibration.

Geita Mine in Tanzania has recently commissioned their SAG milling circuit with the OCS for logging valuable operating data. It now controls the circuit, maximising throughput and stabilising product grind quality at the plant target. The feed to the circuit is highly variable. The unit detects which type of feed the mill is receiving and makes operating changes to keep production and quality targets in line. Final commissioning is scheduled for July 2001.

Svedala Cisa OCS can be configured to control any mineral processing application. These units are operating on crushing, grinding, flotation, thickening, kilns and pyrometallurgical processes worldwide.

Svedala Cisa

(011) 961 4065

[email protected]

www.svedala-cisa.com

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