Phase quantification in iron ore

Authors: Takehara, L.¹; Vasconcellos, M.A.Z.²; Hinrichs, R.³; da Cunha, J. B. M.²; Chemale Jr, F.³

Source: Mineral Processing and Extractive Metallurgy, Volume 118, Number 3, September 2009 , pp. 168-174(7)

Publisher: Maney Publishing

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Abstract:

Quantitative phase analysis in iron ore is necessary to get a controlled blend to produce sinter feed of high quality. Optical microscopy (OM) is the routinely performed technique, but it is time consuming and affected by operator bias. In this work, Mössbauer spectroscopy, X-ray diffraction with Rietveld full profile fitting and thermogravimetric analysis were applied to investigate the reliability of a proposed OM phase quantification procedure. The method is performed on digital micrographs, with visual phase estimation of several subdivisions of the image. In this work, the authors discuss the peculiarities of the Alegria iron ore (Alegria Mine, Quadrilátero Ferrífero, Brazil), which consists mostly of haematite/goethite, with subordinate magnetite content and quartz as principal gangue mineral. The relevance of the quartz fractionation to finer grain sizes is also discussed. Results indicate overestimation of goethite in certain grain size fractions that have to be taken into account for correct phase evaluation.

Keywords: IRON ORE CHARACTERISATION; PHASE QUANTIFICATION; OPTICAL MICROSCOPY; MÖSSBAUER SPECTROSCOPY; RIETVELD METHOD; TERMOGRAVIMETRICAL ANALYSIS

Document Type: Research article

DOI: 10.1179/174328509X431445

Affiliations: 1: Instituto de Física da Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500 Bairro Agronomia, CEP 91501-970 Porto Alegre, RS, Brazil, Programa de Pós-graduação em Geociências da Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500 Bairro Agronomia, CEP 91501-970 Porto Alegre, RS, Brazil;, Email: lucytakehara@gmail.com 2: Instituto de Física da Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500 Bairro Agronomia, CEP 91501-970 Porto Alegre, RS, Brazil 3: Programa de Pós-graduação em Geociências da Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500 Bairro Agronomia, CEP 91501-970 Porto Alegre, RS, Brazil, Instituto de Geociências da Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500 Bairro Agronomia, CEP 91501-970 Porto Alegre, RS, Brazil

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