Manufacturing Technology 2022, 22(6):655-659 | DOI: 10.21062/mft.2022.080

Processing of Deep-sea Nodules by Silicothermic Reduction

Klára Borkovcová ORCID..., Pavel Novák ORCID..., Eliška Chmelíková
University of Chemistry and Technology, Prague, Department of Metals and Corrosion Engineering, Technická 5, 166 28 Prague 6, Czech Republic

Deep-sea nodules are ores formed on the sea floor at depths of 3000 to 6000 m as a result of sedimen-tation. They range in size from 1 cm to 15 cm and contain mainly manganese and iron and other ele-ments that are collected from the nodules by complex pyrometallurgical and hydrometallurgical pro-cesses. These other elements of interest are bound in the nodules mainly in the form of manganese and iron oxides. In order to achieve a high yield of metals bound in nodules in the form of oxides, it is necessary to disintegrate this arrangement in the lattice. This can be achieved by exposing the deep-sea nodules to a reducing condition. This paper deals with the one-step recovery of metals of interest from nodules using silicothermic reduction with 10% excess silicon over stoichiometry. The phase composition, microstructure and mechanical properties of the obtained reduced material were determined.

Keywords: Deep-sea nodules, Silicothermic reduction, Microstructure
Grants and funding:

This research was funded by Czech Science Foundation, project No. 20-15217S

Received: July 19, 2022; Revised: December 8, 2022; Accepted: December 9, 2022; Prepublished online: December 9, 2022; Published: January 6, 2023  Show citation

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Borkovcová K, Novák P, Chmelíková E. Processing of Deep-sea Nodules by Silicothermic Reduction. Manufacturing Technology. 2022;22(6):655-659. doi: 10.21062/mft.2022.080.
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