Technical note bubble size measurement in flotation machines

Chen, F.; Gómez, C.O.; Finch, J.A.

doi:10.1016/s0892-6875(01)00023-1

Cited by 74 publications

(29 citation statements)

References 17 publications

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“…Overall, photography is more sensitive to smaller bubbles than larger ones, requires relatively clear media, and possesses issues with occlusion and depth of field [76]. Cameras have been attached to specially adapted microscopes located externally to the process apparatus or placed directly adjacent to the apparatus wall with resulting images printed and analyzed after viewing through a microscope [13].…”

Section: Early Photographic Methodsmentioning

confidence: 99%

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Measurement of bubble and pellet size distributions: past and current image analysis technology

Junker

2006

Bioprocess Biosyst Eng

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Measurements of bubble and pellet size distributions are useful for biochemical process optimizations. The accuracy, representation, and simplicity of these measurements improve when the measurement is performed on-line and in situ rather than off-line using a sample. Historical and currently available measurement systems for photographic methods are summarized for bubble and pellet (morphology) measurement applications. Applications to cells, mycelia, and pellets measurements have driven key technological developments that have been applied for bubble measurements. Measurement trade-offs exist to maximize accuracy, extend range, and attain reasonable cycle times. Mathematical characterization of distributions using standard statistical techniques is straightforward, facilitating data presentation and analysis. For the specific application of bubble size distributions, selected bioreactor operating parameters and physicochemical conditions alter distributions. Empirical relationships have been established in some cases where sufficient data have been collected. In addition, parameters and conditions with substantial effects on bubble size distributions were identified and their relative effects quantified. This information was used to guide required accuracy and precision targets for bubble size distribution measurements from newly developed novel on-line and in situ bubble measurement devices.

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Section: Early Photographic Methodsmentioning

confidence: 99%

“…In obtaining a satisfactory number of bubbles in a single frame, a compromise existed as too many bubbles caused overlap and too few bubbles required counting many frames [13]. The number of frames that required counting for accurate data analysis decreased with lower mean bubble size [55].…”

Section: Measurement Assumptions and Trade-offsmentioning

confidence: 99%

Measurement of bubble and pellet size distributions: past and current image analysis technology

Junker

2006

Bioprocess Biosyst Eng

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“…The bubble size in flotation was measured using the photographic method (Chen et al, 2001;Hernandez-Aguilar et al, 2005). A CCD camera was used to capture images of bubbles in a viewing chamber as they rose from the pulp zone through a tube.…”

Section: Bubble Size Measurementmentioning

confidence: 99%

Benchmarking flotation performance: Single minerals

Muganda

Zanin

Grano

2011

International Journal of Mineral Processing

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“…Cabe mencionar que este método provee datos globales del Dd, considerando un flujo homogéneo de burbujas en el equipo de flotación. Otros métodos, que bien podrían describir el tamaño de burbuja tomando en cuenta distribución de burbujas y, por tal, velocidades de fase, es el descrito por Finch y colaboradores, en la técnica viewing chamber [14][15][16] . Otro procedimiento es mediante la captura de imágenes de burbujas en el equipo de flotación.…”

Section: Sb=unclassified

Cinética de separación de Cu (II) por técnicas de flotación iónica, en celdas con dispersores flexibles

Pérez¹,

Tavera²,

Escudero³

et al. 2010

REVMETAL

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ResumenEste estudio investiga y determina experimentalmente los parámetros cinéticos y el efecto de la modificación de las condiciones químicas e hidrodinámicas de las dispersiones aire-líquido, durante la separación de Cu (II) mediante téc-nicas de flotación iónica en celdas con dispersores porosos. Los resultados muestran que la eliminación de Cu (II) de la solución se puede llevar acabo por flotación iónica en una etapa, con 68 y 56 % de recuperación y una concentración de xantato de 0,02 g/l, para los difusores de burbujas cilíndrico y plano, respectivamente. En sistemas multi etapas cinco celdas, se lograron recuperaciones superiores al 92 % para ambas geometrías de dispersión. La constante cinética de flotación aparente mantiene un comportamiento lineal con los parámetros que caracterizan una dispersión (Jg, e g y Db), hasta un punto donde la inestabilidad del proceso vuelve inoperable el sistema. Los resultados muestran que la remoción de iones de metal base por técnicas de flotación iónica se ve fuertemente afectado por los factores: concentración de colector [C], Jg, eg, Db, Jl y Sb. Palabras claveCinética; Flotación iónica; Cobre; Celdas; Gas retenido. Kinetics of Cu (II) separation by ion flotation techniques, in cells with flexible spargers AbstractThis research studies and experimentally determines the kinetic parameters and effect of modifying the hydrodynamics and chemical conditions of the air-liquid dispersions during the Cu (II) extraction by ion flotation techniques in cells with porous spargers. Results show that the elimination of Cu (II) from solution can be carried out by ion flotation in one stage, obtaining efficiencies of 68% and 56% for the flat and cylindrical sparger respectively with a xanthate concentration of 0,02 g/l. In multistage systems five cells, recoveries over 92 % were achieved for both sparger geometries. The behavior of the flotation apparent kinetic constant is linear to the parameters that characterize dispersion (Jg, e g y Db), until a point is achieved where the process instability makes the system inoperable. The results show that removing base metal ions by ion flotation is strongly affected by the following factors: collector concentration [C], Jg, eg, Db, Jl and Sb.

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Technical note bubble size measurement in flotation machines

Cited by 74 publications

References 17 publications

Measurement of bubble and pellet size distributions: past and current image analysis technology

Measurement of bubble and pellet size distributions: past and current image analysis technology

Benchmarking flotation performance: Single minerals

Cinética de separación de Cu (II) por técnicas de flotación iónica, en celdas con dispersores flexibles

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