2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 3: Takano Intl. Symp. / Metals & Alloys Processing

Editors:	Kongoli F, Noldin JH, Mourao MB, Tschiptschin AP, D'Abreu JC
Publisher:	Flogen Star OUTREACH
Publication Year:	2015
Pages:	550 pages
ISBN:	978-1-987820-26-3
ISSN:	2291-1227 (Metals and Materials Processing in a Clean Environment Series)

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Pretreatment of Jaccurici Ore from Ferbasa-Brazil: Effect on Energy Consumption

Eli Ringdalen¹; Marcelo Rocha²; Paulo Figueiredo³; Merete Tangstad⁴;
¹SINTEF, Trondheim, Norway; ²FERBASA BRASIL, Salvador, Brazil; ³SENAI CIMATEC, Salvador, Brazil; ⁴NTNU, Trondheim, Norway;
Type of Paper: Regular
Id Paper: 327
Topic: 3

Abstract:

In many metal producing processes, a prereduction unit that will pre-reduce the iron and dry the raw materials will reduce the electrical consumption per ton of alloy. This is a technology often used in industrial HCFeCr production. This paper presents a theoretical analysis of the effect of different pretreatment steps on energy consumption in HCFeCr production with use of Jaccurici ore from Ferbasa. The actual steps are drying, preheating, evaporation of crystalline bound water and prereduction of iron and chromium oxides. By heating the raw materials to 600 °C and evaporating the water, the savings in energy consumption can be more than 20%. Preheating and prereduction require energy and the choice of energy source will affect the environmental footprint. Various means of preheating are discussed. To be sustainable, energy sources that are not otherwise used must be utilised. CO-gas from HCFeCr-production with Jaccurici ore has an energy content of more than 2000 kWh/ ton of alloy and is a possible energy source for pretreatment of the ores.<br />Heating and prereduction will change the physical properties of the raw materials and may, through this, further affect final reduction to alloy and thus chromium losses to slag. Prereduction of Jaccurici ore and its effect of further reduction are discussed based on results from small scale experiments with Jaccurici ore.

Keywords:

Ferrous; Metallurgy; Sustainability;


References:

[1] Ringdalen E: The High Carbon Ferrochromium Process, Reduction Mechanisms, PhD thesis, NTNU, Trondheim, 1999, ISBN 82-471-0429-6
[2] E Ringdalen, M Rocha, J R Neto, T Malvik: Properties of chromite ores from Ferbasa and their effect on Cr-losses to slag during HCFeCr production at Ferbasa, INFACAON 13, Kazakhstan, June 2013
[3] Eric RH: Treatise of Process Metallurgy, Volume 3, Chapter 1.10. Elsevier 2014, ISBN 978-0-08-096986-2
[4] Lloyd Nelson R: Evolution of the Mega Scale in Ferro-alloy electric furnace smelting: Celebrating the Megascale, Proceedings of the extraction and Processing division, TMS 2014
[5] E Ringdalen, M Rocha, P Figueiredo: Energy consumption during HCFeCr-production at Ferbasa, INFACON 14, Ukraine, June 2015 (To be published)
[6] S McCullough, S Hockaday, C Johnson, N.a Barcza: Pre-reduction and smelting characteristics of Kazakstan ore samples, INFACON 12, Helsinki Finland 2010.

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Cite this article as:

Ringdalen E, Rocha M, Figueiredo P, Tangstad M. Pretreatment of Jaccurici Ore from Ferbasa-Brazil: Effect on Energy Consumption. In: Kongoli F, Noldin JH, Mourao MB, Tschiptschin AP, D'Abreu JC, editors. Sustainable Industrial Processing Summit SIPS 2015 Volume 3: Takano Intl. Symp. / Metals & Alloys Processing. Volume 3. Montreal(Canada): FLOGEN Star Outreach. 2015. p. 83-92.