TÉCNICAS DE MICROSCOPIA ÓTICA E MICROSCOPIA ELETRÔNICA DE VARREDURA AUTOMATIZADA (QEMSCAN) APLICADAS A DIFERENTES TIPOLOGIAS DE MINÉRIO DE FERRO
OPTICAL MICROSCOPY AND QUANTITATIVE EVALUATION OF MINERALS BY SCANNING ELECTRON MICROSCOPY (QEMSCAN) APPLIED TO DIFFERENT TYPES OF IRON ORE
Gonçalves, Tatiane Aparecida Rocha; Peres, Antônio Eduardo C.
http://dx.doi.org/10.4322/2176-1523.0858
Tecnol. Metal. Mater. Min., vol.12, n4, p.342-349, 2015
Resumo
A realidade do mercado de minério de ferro é a exaustão dos minérios com elevado teor de ferro e o aumento da explotação de minérios pobres, com presença de complexas associações mineralógicas, que necessitam de maior detalhamento em suas caracterizações, aplicando técnicas tais como difração de raios-X, microscopia ótica, Mossbauer, QEMSCAN (Quantitative Evaluation of Minerals by Scanning Electron Microscopy), entre outras. Uma adequada caracterização mineralógica é fundamental para a determinação da melhor rota de processo a ser aplicada ao minério, através das informações sobre a assembleia mineralógica, morfologia e textura dos cristais e grau de liberação. O trabalho em questão avaliou quatro diferentes tipos de itabiritos, através das duas técnicas atualmente mais utilizadas para a caracterização mineralógica, sendo elas: microscopia ótica e QEMSCAN. Os resultados das análises indicam que as técnicas de caracterização se complementam.
Palavras-chave
QEMSCAN, Microscopia ótica, Minério de ferro.
Abstract
The reality of the iron ore market is the exhaustion of ore with high iron content and the increased exploitation of poor ores, with the presence of complex mineralogical associations, that need more detailed in their characterizations, applying techniques such as X-ray diffraction, optical microscopy, Mossbauer, Quantitative Evaluation of Minerals by Scanning Electron Microscopy, among others. A suitable mineralogical characterization is essential to determine the best process route to be applied to the ore through the information about mineralogical assembly, morphology and texture of the crystals and the degree of liberation. The study in question assessed four different types of itabirites, using methods currently to mineralogical characterization, called: optical microscopy and Quantitative Evaluation of Minerals by Scanning Electron Microscopy – QEMSCAN. Allowing thus to determine the most appropriate technique for each type of mineralogical assembly.
Keywords
QEMSCAN, Optical microscopy, Iron ore.
Referências
1 Jackson BR, Sutherland DN, Gottlieb P, Quittner VH. QEM*SEM: the mineralogical assessment system for the metallurgist. In: International Conference on Base Metals Technology; 1989 February 8-10; Jamshedput, India. Australia: CSIRO; 1989. p. 471-483.
2 Donskoi E, Manuel JR, Austin P, Poliakov A, Peterson MJ, Hapugoda S. Comparative study of iron ore characterisation by optical image analysis and QEMSCANTM. In: CSIRO, The AusIMM. Proceedings of the Iron Ore Conference; 2011 July 11-13; Perth, Western Australia. Perth: CSIRO; 2011. 213 p.
3 Klein C, Dutrow B. Manual de ciência dos minerais. 23. ed. Porto Alegre: Bookman; 2012.
4 Ribeiro RK. New sample preparation developments to minimize mineral segregation in process mineralogy. In: International Council for Applied Mineralogy. Proceedings of the 10th International Congress for Applied Mineralogy; 2011 August 01-05; Trondheim , Norway. Trondheim: ICAM; 2011.
5 Costa GM, Resende VG, Toríbio NM. Quantitative phase analysis of iron ore concentrates. Rem: Revista Escola de Minas. 2002;55(4):263-266.
2 Donskoi E, Manuel JR, Austin P, Poliakov A, Peterson MJ, Hapugoda S. Comparative study of iron ore characterisation by optical image analysis and QEMSCANTM. In: CSIRO, The AusIMM. Proceedings of the Iron Ore Conference; 2011 July 11-13; Perth, Western Australia. Perth: CSIRO; 2011. 213 p.
3 Klein C, Dutrow B. Manual de ciência dos minerais. 23. ed. Porto Alegre: Bookman; 2012.
4 Ribeiro RK. New sample preparation developments to minimize mineral segregation in process mineralogy. In: International Council for Applied Mineralogy. Proceedings of the 10th International Congress for Applied Mineralogy; 2011 August 01-05; Trondheim , Norway. Trondheim: ICAM; 2011.
5 Costa GM, Resende VG, Toríbio NM. Quantitative phase analysis of iron ore concentrates. Rem: Revista Escola de Minas. 2002;55(4):263-266.
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