Decomposition of heavy metal-dodecylsulfate complexes generated by ion- and precipitate-flotation

Conference · Sat Jul 01 04:00:00 EDT 1995

OSTI ID:72818

Sreenivasarao, K; Doyle, F M ^[1]

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1. Univ. of California, Berkeley, CA (United States). Dept. of Materials Science and Mineral Engineering

A promising method for removing heavy metal ions from dilute effluents is ion or precipitate flotation, in which a suitable collector is added to form hydrophobic metal collector complexes or compounds that can be collected as foams. The authors have successfully removed Cu(II), Cd(II), and PB(II) from dilute solutions using sodium dodecylsulfate and ethanol as collector and frother respectively. However, the process would not be economically viable unless the collector could be recycled, and the heavy metals recovered in a concentrated, preferably marketable, form from the foams. The authors investigated four different methods to decompose heavy metal-dodecylsulfate complexes, namely precipitation of hydroxides, precipitation of sulfides, chemical stripping, and electrolysis. The authors compare the performance of these methods. In each case the observed behavior is related to known thermodynamic data, and potential applications are discussed.

• OSTI ID: 72818
• Report Number(s): CONF-950201--; ISBN 0-87339-287-6
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
CADMIUM
CHEMICAL EFFLUENTS
COPPER
INDUSTRIAL WASTES
LEAD
MATERIALS RECOVERY
TECHNOLOGY ASSESSMENT
WASTE PROCESSING