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Thickener operations at Carajas using a fuzzy logic controller

This paper details development of a fuzzy logic controller at Carajas iron ore mine and its implementation within Comdale/X-an off-line expert system development tool. The controller provides advice about operating two 80 m diameter slime thickeners. Creation of the fuzzy sets and rules involved a knowledge engineer and expert-operator working together for a period of about 8 hours. System refinement and addition of adaptive techniques took another day's work. The controller is based on a heuristic model using the expertise of one of CVRD's most-experienced operators.