Modeling and optimization of phosphogypsum transformation into calcium fluoride using experimental design methodology
Written by sctunisie no commentsIn this work, the experimental design methodology has been used for the modeling and optimization of phosphogypsum transformation into calcium fluoride and sodium sulfate. For this reason a four factors box behnken design has been chosen to be used. The studied factors were reaction time (X1), NaF/phosphogypsum ratio (X2), mass of phosphogypsum (X3) and stirring speed (X4) while Y1 (the calcium yield) and Y2 (the purity of the formed precipitate) are selected as the responses variables. A compromise between the studied responses has been determined and the optimum conditions for this reaction have been fixed at a reaction time of 97.80 min, a NaF/phosphogypsum ratio equal to 2.06, with 8.13 g of phosphogypsum mass and a stirring speed of 506.39 rpm. At these experimental conditions the calcium yield is 95.61% and the purity of the formed precipitate is 98.86%.
H. Douahem, H. Hammi, A.H. Hamzaoui, A. M’nif
phosphogypsum, box behnken design, Response surface methodology, optimization
Pages 106-113
