C.-M. Chang, H. Gu, and T.J. O'Keefe, Department of Metallurgical Engineering and Materials Research Center, University of Missouri-Rolla, Rolla, MO, 65401

ABSTRACT A new process which is applicable for the treatment of waste residues associ-ated with the metals industry is currently being developed. The unique part of the technology is the use of solid metal reductants in organic solvent systems to spontaneously remove contained impurity ions. The engineering options, termed simultaneous or separate stripping, that can be used in a flow sheet design using the galvanic stripping process are described. In addition, the ef-fects of various operating parameters on the efficiency of the process are described. Examples of the variables which influence the process kinetics include the type of metal or alloy used, the im-purity ion concentration, the chemical concentrations of the active organic and aqueous solutions and their oxygen contents. Tentative flow sheets of how the process could be used in the treatment of iron-zinc neutral leach residue from an industrial operation are discussed.

KEYWORDS: solvent extraction, metallurgy, oxidized waste, iron, zinc

This paper is from the Proceedings of the HSRC/WERC Joint Conference on the Environment, May 1996, published in hard copy and on the Web by the Great Plains/Rocky Mountain Hazardous Substance Research Center.

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