Navegando por Autor "Silva, Tatiane Carvalho"

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    Utilização do óleo de pequi como coletor na microflotação de apatita
    (Universidade Federal de Goiás, 2014-11-07) Silva, Tatiane Carvalho; Silva, Elenice Maria Schons; Silva, André Carlos; http://lattes.cnpq.br/2682532729839545; Silva, André Carlos; Silva, Elenice Maria Schons; Vieira, Luis Gustavo Martins; Costa, Demilson da Silva
    Pequi is an abundant fruit in the states that have the main phosphate concentration areas in Brazil. Fatty acids are substances that act as collectors in the phosphate flotation, and are present in vegetable oils. Pequi being an oleaginous fruit, its potential as a collector can be valued and explored in the region. In this context, this study aimed to apply the pequi’s oil, extracted from white and yellow pulp of the fruit, in apatite’s froth flotation, verifying its potential to be used as collector. This Brazilian fruit is rich in fatty acids with predominance of oleic and palmitic acids. For the white pulp (outer mesocarp) application, extraction procedures were performed using Soxhlet extractor, and subsequently was executed the separation of the solvent present in the extract. The yellow pulp (inner mesocarp) oil was obtained at Goiânia’s Central Market, and was produced by a specialized company. The pequi’s yellow pulp oil was subjected to chemical characterization, with the determination of its acidity, saponification, iodine and determination of unsaponifiable matter. The verification of this oil performance as collector was performed using microflotation in Hallimond tube, by varying the concentration of the collector and the pH of the solution. The microflotation was performed with samples of pure apatite. The mineral was subjected to chemical characterization and determination of density by pycnometry. Besides pequi’s oil, tests were performed with Flotigam 5806 collector, from the company Clariant, which was used as a comparative parameter. The collectors were previously submitted to alkaline hydrolysis (saponification) for its application in froth flotation. The microflotation results were statistically analyzed using analysis of variance - ANOVA, checking if the pH and concentration factors influenced mineral recoveries. It was observed that the white pulp extract was not effective in apatite’s froth flotation. It is believed that the methods of extraction and refining were not efficient to obtain the fatty acids present in this pulp. Pequi’s yellow pulp oil obtained high recoveries of apatite in microflotation tests, similar to the results of the industrial collector used as a parameter. Therefore, saponified pequi’s oil can be an alternative collector being applied on the froth flotation of phosphate minerals.