Recovery of zinc from residues by SX-galvanic stripping process
- Univ. of Missouri, Rolla, MO (United States)
The treatment of oxidized residues of zinc with high iron content continues to present a technical challenge in both the steel and zinc industries. Two main problems are commonly identified and include high treatment costs and environmental concerns about contaminated, iron-bearing residuals. A new approach to this problem is described in which selective separation of the iron and zinc into salable products may be potentially feasible. The waste material is first leached to give a solution having an approximate concentration of 110 g/l Zn, 15 g/l Fe and 40 g/l H{sub 2}SO{sub 4} and other impurities such as Pb, Cd, Cu and Sb. A suitable organic, such as D2EHPA, is used to load the majority of the iron. The aqueous phase is then acceptable for zinc electrowinning after standard solution purification. The novel step in the flow sheet is the efficient recovery of the ferric iron from the organic solvent using a solid metal to reduce the iron to the ferrous state. The Fe{sup +2} is easily stripped into an aqueous phase in a relatively pure form, suitable for use in water treatment. Process parameters and possible flow sheet designs are described and discussed.
- OSTI ID:
- 197271
- Report Number(s):
- CONF-951105-; ISBN 0-87339-318-X; TRN: IM9612%%45
- Resource Relation:
- Conference: 3. international symposium on reycling of metals and engineered materials, Point Clear, AL (United States), 12-16 Nov 1995; Other Information: PBD: 1995; Related Information: Is Part Of Third international symposium: Recycling of metals and engineered materials; Queneau, P.B. [ed.] [Hazen Research, Inc., Golden, CO (United States)]; Peterson, R.D. [ed.] [Reynolds Metals Co., Muscle Shoals, AL (United States)]; PB: 1048 p.
- Country of Publication:
- United States
- Language:
- English
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