Abstract
The optimal operation of a flotation circuit, which is used to separate two minerals is discussed. The optimal control of the flotation circuit at Lake Dufault is found to be a bang-bang control, to contain a singular sub-arc, or to be totally singular depending on the various practical constraints. The influence of the time-delay on the optimal control of the flotation circuit is then investigated. Although the influence of the delay is quite significant, the basic structure of the optimal policy remains roughly the same. Thus it is not unreasonable to ignore the delay, although the optimality suffers from this.
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