Biotechnologies for Wastewater Treatment in the Mineral Industry

Barbosa, Natalia R.; Bertolino, Sueli Moura; Cota, Renata Guerra-Sá; Leão, Versiane Albis

doi:10.1007/978-3-319-52132-9_48

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“…Além disto, isto ocorre normalmente em pH acima de 9, valor máximo permitido para descarte, o que exige novo ajuste do pH após a remoção do metal. O manganês pode também ser precipitado como MnO 2 , mas a cinética de oxidação do íon Mn 2+ pelo oxigênio do ar é lenta para valores de pH abaixo de 8,2-8,5 [3].…”

Section: Introductionunclassified

CARACTERIZAÇÃO TECNOLÓGICA DE UMA ZEÓLITA EXAURIDA, PARA REMOÇÃO DE ÍONS Mn2+

Gonzaga¹,

Leão²,

Cunha³

2018

Tecnologia Em Metalurgia Materiais E Mineração

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Associação Brasileira de Metalurgia, Materiais e Mineração. Publicado pela ABM. Este é um artigo de acesso aberto distribuído sob os termos da licença Creative Commons CC BY-NC-ND (Attribution-NonCommercial-NoDerivs) -https:// creativecommons.org/licenses/by-nc-nd/4.0/. TECHNOLOGICAL CHARACTERIZATION OF AN EXAURID ZEOLITE FOR REMOVAL OF Mn 2 + IONS AbstractZeolites have important chemical properties which combined with their availability and low-cost support their application in various industrial processes. Currently, much attention has been given to their use for metal sorption from wastewaters and industrial effluents. Therefore, the present study carried out a technological characterization of a waste zeolite sample followed by assessing its application in the removal of Mn 2+ ions in different experimental conditions. The material used in this work was a spent synthetic zeolite used as a petroleum cracking catalyst. The zeolite was firstly washed in a 1 mol.L -1 NaOH solution. After characterization, batch sorption experiments were carried out with 50 mg.L -1 Mn 2+ synthetic solutions. The pH values were set between 4 and 8 and temperature in the 25-70°C range. The zeolite phase was identified by X-ray diffraction as faujasite. The optimum pH for manganese sorption was 6.5 and the optimum temperature value was 25°C. The time required for equilibrium to be achieved was 4 hours, which enabled to attain a loading of 10.8 mg Mn 2+ /g zeolite. The results herein presented confirmed the potential application of this material for manganese ions sorption.

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Section: Introductionunclassified