Estudos de flotação de caulinita

Detalhes bibliográficos
Ano de defesa: 2009
Autor(a) principal: Otavia Martins Silva Rodrigues
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal de Minas Gerais
UFMG
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: http://hdl.handle.net/1843/MAPO-7RSPBY
Resumo: The increasing presence of kaolinite (main mineral which composes the kaolin ores) in bauxites and iron ores is a matter of concern. The search for methods to separate kaolinite, highly undesirable in the subsequent processes, from iron minerals is required. Very fine particles are originated from kaolinite in ore fragmentation operations. Flotation is presented as a possible kaolinite separation method in bauxites and ironores due to its applicability in a wide size range. Flotation is a separation process applied to solid particles which explores differences in surface characteristics amongst various present species. The objective of this work was the fundamental study of the variables involved (type and concentration of reagents, pH) in kaolinite flotation through microflotation tests in a Hallimond tube and zeta potential determinations. The tests were performed with a pure sample of kaolinite (96%). Six collectors weretested: 2-amino-1-hexanol (AH), Duomeen T (DT), cetylpiridinium chloride (CCP), cetyltrimethylammonium bromide (CTAB), dodecylamine (DDA), and Flotigam EDA (EDA). Four of them performed well as collectors, in the concentration of 1x10-4mol/L: CCP, CTAB, DDA and EDA. Collector DT presented efficiency in the recovery of kaolinite only for concentrations higher than 1x10-3mol/L. AH did not present efficiency in the flotation of kaolinite, probably, due to its short hydrocarbon chain. The isoelectric point determined for the kaolinite was at pH = 4.6. Likely the mechanism of adsorption of the reagents onto the mineral surface is through electrostatic and hydrogen bonds.