ResumoA espectrometria de fluorescência de raios X (FRX ou XRF) é uma das técnicas analíticas mais utilizadas em geoquímica. Na indústria mineral também se utiliza a espectrometria de absorção atômica (AA). A comparação de concentrações de sílica e alumina de oito amostras padronizadas de minério de ferro obtidas a partir das técnicas FRX e absorção atômica, constitui o objetivo deste trabalho. Foram realizadas análises dos mesmos padrões em outros dois laboratórios para reprodutibilidade dos resultados. Foram utilizados um espectrômetro FRX e um espectrômetro de absorção atômica para realização dos ensaios. As análises produziram resultados satisfatórios, com desvios médios de 0,502 para a sílica e 0,096 para a alumina. Palavras-chave: Espectrometria; Raio-X; Absorção atômica; Minério de ferro. COMPARATIVE ANALYSIS BETWEEN TWO METHODS OF ATTAINMENT OF SILICA AND ALUMINA IN IRON ORE AbstractThe spectrometry of fluorescence of rays X (FRX or XRF) is one of the used analytical techniques more in geochemistry. In the mineral industry also the spectrometry of atomic absorption (AA). The comparison of concentrations of silica and alumina of eight standardized samples of iron ore gotten from techniques FRX and atomic absorption constitutes the objective of this work. They had been carried through analyses of the same standards in others two laboratories for reprodutibility of the results. A spectrometer FRX and a spectrometer of atomic absorption for accomplishment of the assays had been used. The analyses had produced resulted satisfactory, with average shunting lines of 0,502 for silica and 0,096 for alumina..
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