A Review of the Modified Zincex® Process from Skorpion to Horsehead


In the 1990's, Técnicas Reunidas developed the Modified ZINCEX® Process to recover zinc from ores and secondary materials. The heart of this process was the use of solvent extraction to produce purified zinc electrolyte instead of traditional zinc dust cementation. This development was commercialized by Reunion Mining and Anglo American for primary ore at the Skorpion mine in Namibia with the first SHG zinc produced in May 2003. Horsehead Corporation through Horsehead Metal Products, Inc., its wholly owned subsidiary, is presently commercializing the MZP for the treatment of Waelz oxide. This paper will review open source information about the lessons learned and process modifications that have occurred at Skorpion over the past decade. It will also provide an update on Horsehead)s facility being constructed in Rutherford County, North Carolina.

Meeting Name

2014 SME Annual Meeting and Exhibit, SME 2014: Leadership in Uncertain Times (2014: Feb. 23-26, Salt Lake City, UT)


Materials Science and Engineering

Keywords and Phrases

Solvent extraction, Anglo americans; Metal products; North Carolina; Open source information; Process modifications; Secondary materials; Wholly owned subsidiaries; Zinc electrolyte, Zinc

International Standard Book Number (ISBN)


Document Type

Article - Conference proceedings

Document Version


File Type





© 2014 Society for Mining, Metallurgy and Exploration, All rights reserved.

Publication Date

01 Jan 2014

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