Microporosity of BIF hosted massive hematite ore, Iron Quadrangle, Brazil
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Academia Brasileira de Ciências
2002
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| author | César A. C. Varajão |
| author_facet | César A. C. Varajão |
| contents | Microporosity of BIF hosted massive hematite ore, Iron Quadrangle, Brazil César A. C. Varajão Ary Bruand Erick R. Ramanaidou Robert J. Gilkes Multidisciplinaria (Ciencias Naturales y Exactas) BIF porosity reducibility massive hematite ore direct reduction iron Massive hematite ore (MHO) is a special high-grade iron ore, used as lump ore in the process of obtainingdirect reduction iron (DRI). The influence of porosity on the reducibility of MHO from the Capitão do MatoMine (Iron Quadrangle, Brazil) was investigated using optical and scanning electron microscopes on drillcore and open pit samples.Hematite is the main component of the samples and occurs as granular crystals (10 µm), microplates (1 µm)and euhedral martite (10 to 30 µm). Quartz, maghemite, kenomagnetite and goethite are minor components.Primary micropores (Å to 1 µm) are associated with microplaty crystals that fill cavities between granularhematite. Secondary micropores (Å to 5 µm) related to euhedral martite crystals, are the most important.The total porosity of weathered samples, measured using nitrogen adsorption and mercury injection, attainsvalues up to 11%, whereas unweathered samples have a porosity less than 2.5%. Reducibility is stronglyenhanced by porosity, but inhibited by structure (bedding). 2002 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32774108 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.1 Vol.74 |
| format | Artículo científico |
| id | redalyc_32774108 |
| institution | Redalyc |
| language | en |
| publishDate | 2002 |
| publisher | Academia Brasileira de Ciências |
| spellingShingle | Microporosity of BIF hosted massive hematite ore, Iron Quadrangle, Brazil César A. C. Varajão Multidisciplinaria (Ciencias Naturales y Exactas) BIF porosity reducibility massive hematite ore direct reduction iron Microporosity of BIF hosted massive hematite ore, Iron Quadrangle, Brazil César A. C. Varajão Ary Bruand Erick R. Ramanaidou Robert J. Gilkes Multidisciplinaria (Ciencias Naturales y Exactas) BIF porosity reducibility massive hematite ore direct reduction iron Massive hematite ore (MHO) is a special high-grade iron ore, used as lump ore in the process of obtainingdirect reduction iron (DRI). The influence of porosity on the reducibility of MHO from the Capitão do MatoMine (Iron Quadrangle, Brazil) was investigated using optical and scanning electron microscopes on drillcore and open pit samples.Hematite is the main component of the samples and occurs as granular crystals (10 µm), microplates (1 µm)and euhedral martite (10 to 30 µm). Quartz, maghemite, kenomagnetite and goethite are minor components.Primary micropores (Å to 1 µm) are associated with microplaty crystals that fill cavities between granularhematite. Secondary micropores (Å to 5 µm) related to euhedral martite crystals, are the most important.The total porosity of weathered samples, measured using nitrogen adsorption and mercury injection, attainsvalues up to 11%, whereas unweathered samples have a porosity less than 2.5%. Reducibility is stronglyenhanced by porosity, but inhibited by structure (bedding). 2002 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32774108 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.1 Vol.74 |
| title | Microporosity of BIF hosted massive hematite ore, Iron Quadrangle, Brazil |
| topic | Multidisciplinaria (Ciencias Naturales y Exactas) BIF porosity reducibility massive hematite ore direct reduction iron |
| url | https://www.redalyc.org/articulo.oa?id=32774108 |