Concentration of bauxite fines via froth flotation

Kurusu, Renata Salles; Chaves, Arthur Pinto; Andrade, Christian Fonseca de; Abreu, Claret Antonio Vidal

doi:10.1590/s0370-44672009000300003

Cited by 6 publications

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“…Most of the Brazilian bauxite processing plants employ operations of comminution, classification and solid-liquid separation. A very few processes include gravimetric concentration in order to remove silicates, or magnetic separation to decrease the amount of Fe-bearing minerals [1,5,6].…”

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“…It is a common industrial practice to introduce project modifications in order to improve the operation product in terms of mass recovery or content of interesting elements in bauxite plants [6,9,10]. In Bergerman and Chaves' works [9], for instance, the modifications were the installation of spiral concentrators in the bauxite processing plant of the Itamarati de Minas plant with the aim of recovering the profitable fine fraction material that had been discharged.…”

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Statistical Evaluation of Scrubbing and Screening Optimization in Bauxite Processing

Gonçalves¹,

Mendes²,

Bergerman³

et al. 2017

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In the Miraí processing plant (Votorantim Metais), bauxite is processed with an average feed of 1,000 t/h in a circuit with crushing, scrubbing and screening stages. Two plant unit operations needed optimization: (1) The scrubber promoted not only the attrition and disaggregation of bauxite, but was also its griding; (2) The screened fine products had material with significant amounts of available aluminium (AA) and low reactive silica (RS) contents. In this work, modifications were introduced in the scrubber and screening circuit in order to improve the plant performance. A pulp lifter was installed in the scrubber. In addition, the apertures of the primary and secondary screens were changed. Statistical univariate analysis was used to support the process gain due to the introduced modifications. According to the variance analysis (ANOVA), there was no loss of product quality since the resulting AA, RS and iron (Fe) contents agree with the metallurgical specification and the previous results before the optimization work. The mass recovery increased by 3.88%, which means a gain of 43 t/h for the operation. Keywords: Bauxite; Scrubbing; Screening; Statistical analysis. AVALIAÇÃO ESTATÍSTICA DA OTIMIZAÇÃO DAS OPERAÇÕES DE ATRIÇÃO E PENEIRAMENTO NO BENEFICIAMENTO DE BAUXITA ResumoNa planta de beneficiamento de Miraí (Votorantim Metais), bauxita é processada com uma alimentação média de 1.000 t/h em um circuito composto por britagem, desagregação em um scrubber e peneiramento. Duas operações da planta necessitavam otimização: (1) O scrubber promovia não só a atrição da bauxita como também sua fragmentação; (2) O peneiramento descartava material com quantidade significativa de alumínio aproveitável (AA) e baixo teor de sílica reativa (SR). Neste trabalho mudanças foram introduzidas no scrubber e no circuito de peneiramento para aprimorar o desempenho da planta. Um sistema de descarregamento foi instalado no scrubber. Além disso, a abertura das peneiras primárias e secundárias foi modificada. Análises estatísticas univariadas foram usadas para confirmar o ganho do processo devido às modificações introduzidas. De acordo com a análise de variância (ANOVA), a qualidade do produto não piorou, pois os teores de AA, SR e ferro (Fe) estão de acordo com a especificação metalúrgica. A recuperação mássica aumentou em 3,88%, o que significa um ganho de 43 t/h para a operação.

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