Resource Recovery of Strategic and Other Metals from Ecm and Edm Operations.
Holcombe-LJ; Dewolf-GB; Edwards-LO; Klausmeirer-RF
For Reference Only At Bureau Libraries :92 pages
The development and widespread use of electrochemical machining (ecm) and electrical discharge machining (edm) have created a new source of heavy metal sludges. These sludges often contain large quantities of strategic metals, including chromium and nickel; however, there was not a great deal of compositional uniformity. The presence of cobalt in ecm sludges was not uncovered, but cobalt was present in some edm sludges. The quantity of edm sludge generated was significantly less than the volume of ecm materials produced. The ecm and edm wastes were evaluated on a dry basis nickel content in order to select the best available technology for extracting nickel and possibly cobalt from these materials. Two methods are proposed: (1) the dried hydroxide approach, where the dry material would be sold to a toll company for its nickel content, and (2) the ammoniacal leach-solvent extraction approach, which would recover nickel sulfate and possibly cobalt and copper metals as cementation products.
CP; Final Contract Report;
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