Sintering and heating reduction processes of alumina containing iron ore samples

Autor:	Mahmoud M. Hessien, A. A. El-Geassy, Y. Kashiwaya, K. Ishii, Mahmoud Nasr
Rok vydání:	2008
Předmět:	Materials science Mechanical Engineering Metallurgy Metals and Alloys Sintering Electron microprobe engineering.material Microanalysis Silicate chemistry.chemical_compound chemistry Iron ore Mechanics of Materials Materials Chemistry engineering Ferrite (magnet) Porosity Magnetite
Zdroj:	Ironmaking & Steelmaking. 35:191-204
ISSN:	1743-2812 0301-9233
DOI:	10.1179/030192307x239551
Popis:	Alumina containing iron ore samples (0·7–5·5%Al2O3) were sintered in a down draft sinter pot. The structures of the produced sinters were microscopically examined and the different phases developed were identified. Electron probe micro analyser (EPMA) was used for the quantitative analysis of Fe, Ca, Si, Mn and Al in different phases. Silico ferrite of calcium and alumina (SFCA) phase sinter was identified and its stability was Al2O3 content dependent. In sinter containing ≤1·5%Al2O3, SFCA was dissociated at higher temperatures to porous magnetite and silicate melt. In samples containing ≥2·5%Al2O3, SFCA was stable and its quantity increased with increasing alumina content. The non-isothermal reduction of sinter samples was carried out using a heating reduction technique with the facility of following up the high temperature phenomena during reduction process. X-ray observations, reduction rate profile and the gasification rate were used for the determination of high temperature properties of samp...
Databáze:	OpenAIRE
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