Dephosphorization of magnetite fines : surface reactions, flotation kinetics and fuzzy logic application

Sammanfattning: The primary objective of the research work presented in this thesis is to investigate the influence of chemical and operational variables on the apatite flotation kinetics and to establish a suitable model using traditional method and fuzzy logic. The thesis consists of three parts, i.e., surface reactions, flotation kinetics and fuzzy logic application. In the thesis, the kinetic parameters of a modified first-order model with fast and slow-floating components were utilized in judging the influence of reagent dosages on flotation performance. The optimum flotation conditions were presented and a fuzzy model of general semi-batch flotation is used to predict the influence of collector and dispersant dosages on flotation responses. The simulation result shows that a developed fuzzy logic controller can reduce collector dosage consumption of the apatite flotation process while maintaining the P-MC within an acceptable limits (<0.025%P).