Analysis of shake flask experiments results conducted on residues from hydrometallurgical processes
International Journal of Environmental Science and Technology. 2009; 6 (1): 57-68
in English
| IMEMR
| ID: emr-91330
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
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Index:
IMEMR (Eastern Mediterranean)
Main subject:
Sewage
/
Risk Assessment
/
Industrial Waste
Language:
English
Journal:
Int. J. Environ. Sci. Technol.
Year:
2009
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