A new technique for characterizing aerated flocs in a flocculation–microbubble flotation system

Oliveira, Cláudia Trindade; Rodrigues, Rafael Teixeira; Rubio, J.

doi:10.1016/j.minpro.2010.07.001

Cited by 37 publications

(21 citation statements)

References 24 publications

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“…The flocculation–flotation rig coupled to an AFC technique. 1: Water tank (80 L), 2: polymer solution tank (50 L), 3: kaolin suspension tank (200 L), 4: stereomicroscope with a digital camera, 5: light sources, 6: screen, 7: tube of the AFC technique (see Oliveira et al ), 8: digital camera, 9: flotation cell, 10: FGR, 11: saturator vessel.…”

Section: Methodsmentioning

confidence: 99%

“…The characterization of these structures have shown important features in the environmental area, mainly due to promoting high up‐rising rates, low moisture content and large bubbles entrapped in and attached to these flocs (e.g. http://www.lume.ufrgs.br/handle/10183/1) .…”

Section: Introductionmentioning

confidence: 99%

“…A number of important studies [2,[15][16][17][18][19][20][21][22] on aggregation-flotation with aerated flocs formation have been described in the literature. Most of these studies only observed and described the presence of these aggregates.…”

Section: Introductionmentioning

confidence: 99%

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Operating Parameters Affecting the Formation of Kaolin Aerated Flocs in Water and Wastewater Treatment

Oliveira

Rodrigues

Rubio

2013

CLEAN Soil Air Water

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The formation of aerated flocs (aeroflocs) and the main operating parameters involved were studied to improve the rapid solid/liquid separation by flocculation-flotation. A continuous flow system at the laboratory scale was used that coupled micro-bubbles dissolved air flotation and a flocs generator reactor (FGR). The aerated floc characterization technique was employed to characterize the aggregates obtained using a non-ionic polymer (920SH SNF-Floerger believed that, by maximizing operating parameters, improvements are achieved, mainly, both increasing the removal efficiencies and the design of the equipment that can be more compact requiring fewer areas than conventional units.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Operating Parameters Affecting the Formation of Kaolin Aerated Flocs in Water and Wastewater Treatment

Oliveira

Rodrigues

Rubio

2013

CLEAN Soil Air Water

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“…The problem of processing fine mineral particles has been very well documented and some practical alternatives to alleviate such a problem have been proposed. Examples of these practical alternatives include the reduction of fine generation in rougher regrinding (2), alternative processes based on selective particle aggregation (3)(4)(5)(6)(7), and optimization of the "capture" stage by improving the bubble surface area flux (8,9). One of the promising separation methods for fine minerals is the utilization of the principle of coagulation or flocculation (10)(11)(12)(13).…”

Section: Introductionmentioning

confidence: 99%

Separation of Phosphorus and Magnetic Mineral Fines from Siderite Reductive Ore by Applying Magnetic Flocculation

Bai

Liu

Zhang

2014

Separation Science and Technology

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The characteristics of siderite reductive ore and the ultrafine grinding-magnetic flocculation separation (MFS) of this ore were investigated in the present work. The results indicated that the iron phase in the raw ore was predominantly metallic iron with an iron particle size below 30 µm, and the phosphorus compound was apatite. By applying MFS to siderite reductive ore containing 37.14% Fe and 0.52 P, a concentrate assaying 66.37% Fe and 0.19 P with 74.32% recovery was produced. The iron recovery increased by 5.77% compared with the results of the conventional magnetic separation. The high efficiency in phosphorus removal and iron recovery achieved by the MFS process may be attributed to the adequate liberation of iron particles and the increase in magnetic force on the iron mineral fines in the form of flocs in a magnetic field.

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“….. 36 Figura 8 -Esquema ilustrativo do CFA: (1) câmara de saturação; (2) célula de flotação; (3) câmera digital para filmagem do escoamento; (4) tubo de ascensão; (5) fontes de iluminação; (6) microscópio óptico; (7) câmera digital para captura das imagens dos aglomerados; (8) monitor para visualização das imagens (Fonte: OLIVEIRA; RODRIGUES; RUBIO, 2010) Figura 59 -Freqüência relativa simples e acumulada em número por faixa de tamanho de partículas floculadas para as duas condições onde os melhores resultados em termos de remoção dos parâmetros analisados foram obtidos (Condição 1 -T = 10min / G = 75s Já nos ensaios em escala piloto foram realizados experimentos na ausência de câmara As imagens das bolhas de ar foram obtidas com o emprego de célula de captura de bolhas, microscópio (Zeiss Stemi SV 11), câmera (SONY, Cyber-Shot DSC-S75), fonte de luz fria de 250W (Schott KL 2500 LCD) posicionada no lado oposto ao da câmera e software específico denominado Image Tools (Figura 3).…”

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Influência do tamanho de partículas floculadas na eficiência da clarificação de águas para abastecimento por flotação

Pioltine¹

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A Deus pela oportunidade de aprimoramento intelectual e espiritual concedida a mim nesta vida.A toda a minha família, em especial à minha esposa Aline, aos meus pais Vergílio e Shirley e aos meus irmãos Victor e Luís Flávio, que sempre me apoiaram e estiveram ao meu lado nos momentos de dificuldades e alegrias.Ao Prof. Dr. Marco Antonio Penalva Reali, orientador e grande idealizador desta pesquisa, pela paciência, apoio, incentivo e confiança durante estes sete anos de trabalho (mestrado e doutorado). Agradeço imensamente o aprendizado conquistado sob sua orientação. Sem dúvida alguma, tenho como um dos grandes exemplos a serem seguidos em minha carreira profissional.Aos meus amigos Kisner, Artur José e Ricardo, dentre tantos outros que me acompanharam nestes anos e foram muito importantes nesta fase da minha vida.Às minhas companheiras de LATAR, em especial à técnica Maria Teresa e às alunas Aline Escher e Irene Monteiro, as quais tiveram participação direta na realização desta pesquisa.Ao Alcino, funcionário da USP, o qual também teve participação direta na realização desta pesquisa, efetuando todas as manutenções e adaptações necessárias na unidade piloto de flotação e demais equipamentos empregados.

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A new technique for characterizing aerated flocs in a flocculation–microbubble flotation system

Cited by 37 publications

References 24 publications

Operating Parameters Affecting the Formation of Kaolin Aerated Flocs in Water and Wastewater Treatment

Operating Parameters Affecting the Formation of Kaolin Aerated Flocs in Water and Wastewater Treatment

Separation of Phosphorus and Magnetic Mineral Fines from Siderite Reductive Ore by Applying Magnetic Flocculation

Influência do tamanho de partículas floculadas na eficiência da clarificação de águas para abastecimento por flotação

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