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      Iron removal by precipitate flotation Translated title: Remoção de ferro por flotação de precipitado

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          Abstract

          The water from several artesian wells in the metropolitan area of Recife presents high iron content, preventing its use in some industrial processes. The possibility of removing the iron by the use of precipitate flotation using sodium dodecyl sulphate (SDS) as collector was studied. The tests were carried out in a glass column 65 cm high, fed by a constant airflow. At pH 8, where the isoelectric point of colloidal iron hydroxide [Fe(OH)3] was observed, the size of the precipitate increases with conditioning time and facilitates the removal of iron ions by flotation. The results showed that an increase in conditioning time, from 5 to 20 minutes, resulted in a reduction of the residual concentration of iron from 13.2 to 0.2 ppm. The decrease in precipitate specific surface area rendered a decrease in the collector consumption possible. The iron ion removal process by flotation using SDS as collector was shown to be quite efficient. A removal of 99% of Fe3+ contained in the original solution was obtained.

          Translated abstract

          A água de poços artesianos, da região metropolitana de Recife, contém um elevado teor de ferro, impedindo o seu uso em alguns processos industriais. Estudou-se a possibilidade de remoção do ferro, por flotação de precipitado, usando-se o dodecil sulfato de sódio (DSS) como coletor. Os testes foram realizados em uma coluna de vidro, com 65 cm de altura, alimentada por fluxo de ar constante. Em pH 8, onde foi observado o ponto isoelétrico do hidróxido de ferro coloidal [Fe(OH)3], o tamanho do precipitado aumenta com o tempo de condicionamento, o que favorece a remoção dos íons de ferro por flotação. Os resultados mostraram que um aumento do tempo de condicionamento de 5 para 20 minutos resulta numa redução da concentração residual de ferro de 13,2 ppm para 0,2 ppm. A redução da área superficial dos precipitados possibilitou uma redução do consumo do coletor. O processo de remoção de íons de ferro por flotação, usando DSS como coletor, mostrou-se bastante eficiente. Obteve-se uma remoção de 99% dos íons de ferro contidos na solução original.

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          Most cited references 13

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          Physicochemical processes for water quality control

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            The Scientific Basis of Flocculation

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              Ion flotation

               F. Sebba (1962)
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                rem
                Rem: Revista Escola de Minas
                Rem: Rev. Esc. Minas
                Escola de Minas (Ouro Preto )
                1807-0353
                June 2014
                : 67
                : 2
                : 203-207
                S0370-44672014000200012
                10.1590/S0370-44672014000200012

                http://creativecommons.org/licenses/by/4.0/

                Product
                Product Information: SciELO Brazil
                Categories
                ENGINEERING, CIVIL
                METALLURGY & METALLURGICAL ENGINEERING

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