Numerous production and pollution control processes that are not used in the United States are in use or under development by foreign nonferrous metal producers. Although some do not apply to U.S. conditions, others can reduce pollution, increase production, or lower costs. Many of these foreign processes are described in this report. The descriptions are divided into five categories: pyrometallurgical processes, hydrometallurgical processes, electrolytic processes, air pollution control processes, and water pollution control processes. If data were available, each process description includes a discussion of economic, environmental, and energy considerations, as well as a discussion of the basic operation principles. A detailed analysis of each process is not attempted in this report. For additional information, the reader is referred to the list of references and bibliography following each process description.

"PEDCo Environmental, Inc." "June 1980." Includes bibliographical references. "Contract no. 68-03-2577."