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Analysis of shake flask experiments results conducted on residues from hydrometallurgical processes
Article 6: Volume 6, Number 1, Winter 2009, Pages 57-68 (12) XML PDF (333 K)
Authors
A. Steel; K. Hawbol; F. Khan
Abstract
Hydrometallurgical facilities processing sulfide based ores produce waste residues in the form of sludges that contain concentrations of metals, as well as metal sulfides. As a part of the waste characterization and risk assessment process, a statistical design of experiment was used to assess the significant factors and interactions in the residue leaching process. Two shake flask experiments, a 24 factorial design and 23 central composite design were employed to evaluate the effect of mixing time, test pH, solid/liquid ratio and residue type on acidity, alkalinity, sulfate and metal concentration and pH of the resulting filtered leachate. The results indicate that the variable tested mixing time and solid/liquid ratio most strongly affect metal concentration in the filtrate from waste residue samples tested over a moderate test pH range. When tests were conducted over a longer test period and at lower test pH values, test pH and residue type were dominant factors contributing to residue filtrate metal concentration.
Keywords
acid generation; batch tests; Characterization; Factorial design; Leaching; Process waste
Main Subjects
Hydrometallurgical Processes; Shake flask experiments
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