Abstract (EN)

This paper deals with the blending problem of extracted phosphate ores of different characteristics (phosphate, silica…), to produce required grades that respect range constraints for these haracteristics. The data used in this paper is the actual data from an OCP site1; OCP is world leader of phosphate extraction and transformation (acids, fertilizers) industry. We have extended the traditional LP formulation of the blending problem in a dynamic version where the optimal blends of required grades vary in time and depend on initial stocks and possible feedings of extracted ores and on the set of grades to be produced. The performance of our dynamic blending model has led the OCP site concerned to develop and use an extended version of this model