Poliacrilamidas na flotação catiônica reversa de minério de ferro

• Ano de defesa: 2016
• Autor(a) principal: Marina Filizzola Melquiades de Oliveira
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Poliacrilamida; Hematita; Microflotação; Depressor; Engenharia metalúrgica
• Link de acesso: http://hdl.handle.net/1843/BUBD-AC8G97

Improving the iron metallurgical recovery is a relevant aspect of the reverse cationic flotation. The presence of fine particles in the system strongly affects the process performance. The present study addressed the investigation of previous formation of particles aggregates using synthetic flocculants aiming at increasing the metallurgical recovery in this concentration stage without impairing the concentrate quality. Microflotation experiments were conducted, in a modified Hallimond tube, with pure samples of compact hematite, specular hematite, and quartz, conditioned with corn starch, in the presence and absence of different non ionic poliacrylamides. The addition of flocculants combined with starch enhanced the depression of compact hematite and specular hematite. On the other hand, the addition of poliacrylamides increased the floatability of quartz. All poliacrylamides decreased the dispersion degree of both hematites and quartz, indicating that the poliacrylamides are effective as flocculants, but their action is not selective. The results indicated that the pre-conditioning of the minerals with flocculants is a promising alternative to enhance the iron metallurgical recovery in the flotation stage.