Matte-slag separation behavior during reduction process of iron phase
J. Min. Metall. Sect. B-Metall., 59 (1) (2023) 27-37. DOI:10.2298/JMMB220421003L
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Available online 11 January 2023
(Received 21 April 2022; Accepted 20 December 2022)
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Abstract
The Isa smelting furnace discharges the matte and slag in the same tapping hole. As a result, an electric furnace needs to clean the slag. In the present study, the copper slag cleaning in an electric furnace, particularly the separation of the matte from the slag during the reduction process, was investigated. For Fe3O4 to FeO, the foaming slag in the melt disappeared when the Fe3O4 content was less than 10%. With the formation of the metallic iron, the foaming slag formed again, hindering the sedimentation of the matte. When the anthracite dosage increased to 2.61%, the copper content in the slag increased to 9.46%. The microstructure of the slag and the existence of the metallic iron found in the slag were analyzed in detail. The results obtained in this study provide a theoretical basis for the reasonable control of the transformation of Fe3O4 during the copper slag cleaning.
Keywords: Cleaning; Magnetite; Reduction; Foaming slag
Correspondence Address:
S.-W. Zhou,
Kunming University of Science and Technology, Faculty of Metallurgical and Energy Engineering, Kunming, China; Kunming University of Science and Technology, State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming, China;
email: swzhou90@126.com
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