Paper Title
Modelling of Galenite Flotation from a Disseminated Lead and Zinc Ore using Central Composite Design Method

Abstract
In this work, modelling of galena flotation from a disseminated Lead and Zinc (Pb-Zn) ore containing 0,83% Pb was investigated. In flotation experiments, while the solids ratio and depressant amount (independent variables-parameters) were changed, the collector type and amount, the frother type and amount, particle size, pH, flotation time and the amount of two surfactants were kept constant. The response variables-dependent variables (Pb content and Pb Recovery) were described with mathematical models by using statistical design method. Central Composite Design (CCD) method which is one of the principle response surface methods, was used in statistical design of experiments, analysis of results and modelling of response variables. Two quadratic mathematical models were developed for Pb grade and Pb recovery.Analysis of variance showed that models, created for Pb grade and Pb recovery, were found statistically significant in 95% confidence level. Predicted vs actual values of Pb grade and Pb recovery were also given in graphically. It was found that predicted values represent approximately 96% and 94% of actual Pb grade and Pb recovery, respectively. The high values of R-square (R2) indicate that the models developed for two response variables are powerful. Keywords - Central Composite Design, Modelling, Pb flotation, Pb-Zn ore.