Response surface design for nickel recovery from laterite by sulfation-roasting-leaching process

来源期刊：中国有色金属学报(英文版)2010年增刊第1期

论文作者：李栋 朴庚镐 吴展 郭学益

文章页码：92 - 96

Key words：response surface methodology; sulfation-roasting-leaching; nickel extraction; iron dissolution

Abstract: The present study deals with the nickel extraction and iron dissolution from nickeliferous laterite by a process of sulfation-roasting-leaching. To optimize the roasting process, response surface methodology (RSM) was utilized which employed two-level and two-factor full factorial central composite design (CCD). The factors of roasting temperature and time were studied. Experiments were carried out for fitting two non-linear regression models of nickel extraction and iron dissolution. Predicted values obtained were close to experimental values, indicating the suitability of the models. Three-dimensional surface plots and contour plot were helpful to predicting the results by performing only limited set of experiments. An area of nickel extraction from 75% to 78% and iron dissolution from 5% to 10% is obtained by an overlaid contour plot. The samples roasted at different temperatures and for different durations were characterized by XRD, which show a good agreement to iron dissolution analysis.