Authors: Martín, M I¹; López, F A²; Torralba, J M³

Source: Ironmaking & Steelmaking, Volume 39, Number 3, April 2012 , pp. 155-162(8)

Publisher: Maney Publishing

Abstract:

Rolling mill scale is a solid byproduct of the steelmaking industry that contains metallic iron and three types of iron oxides: wüstite, haematite and magnetite. It also contains traces of non-ferrous metals, alkaline compounds and oils from the rolling process. A study was made of the reduction of mill scale to sponge iron using coke at different temperatures and times. The reduced samples were studied by X-ray diffraction and scanning electron microscopy. Oxygen analysis was carried out by combustion in a LECO oven. Sponge iron was successfully produced for reuse in electric furnaces as part of the metallic charge or as a raw material in the production of iron-based powder metallurgy parts.

Keywords: Recycling; Sponge iron; Coke; Rolling mill scale; Reduction; Iron powder; Solid by-product

Document Type: Original Article

DOI: http://dx.doi.org/10.1179/1743281211Y.0000000078

Affiliations: 1: University Carlos III de Madrid and IAAB, Avda. de la Universidad, 30, Leganés, Madrid 28911, Spain 2: National Centre for Metallurgical Research (CENIM-CSIC), Avda. Gregorio del Amo, 8, Madrid 28040, Spain 3: Institute IMDEA Materials, University Carlos III de Madrid, Avda. de la Universidad, 30, Leganés, Madrid 28911, Spain

Publication date: 2012-04-01

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