A review of the modern characterization techniques for flocs in mineral processing

Liang, Long; Peng, Yaoli; Tan, Jiakun; Xie, Guangyuan

doi:10.1016/j.mineng.2015.10.011

Cited by 70 publications

(17 citation statements)

References 120 publications

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“…Aggregate Size : Aggregate size can be obtained by different methods such as laser diffraction spectroscopy, dynamic image analysis, optical imaging, and sensing zone techniques . We, however, focus our discussion here to focused beam reflectance measurement (FBRM) as a relatively new and effective aggregate sizing technique, that allows for on‐line and in situ characterization of aggregate size without the need for sampling and dilution even in very high concentration slurries (i.e., 20%) …”

Section: Performance Assessment Of Flocculantsmentioning

confidence: 99%

Water Soluble Polymer Flocculants: Synthesis, Characterization, and Performance Assessment

Vajihinejad

Gumfekar

Bazoubandi

et al. 2018

Macro Materials & Eng

137

108

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Water soluble polymer flocculants are important constituents of solid–liquid separation units for the treatment of a variety of process‐affected effluents. The systematic development of a flocculant relies on a good understanding of flocculation process, polymer synthesis, polymer characterization, and, not the least, flocculation performance assessment as desired for a particular treatment process, all of which are essential to establish meaningful relationships between flocculant microstructure and flocculation efficiency. The aim of this article is to communicate the bigger picture of this research area to the readers. The recent advances in the application of bio/natural, synthetic, and stimuli‐responsive flocculants are reviewed. Then, the basic polymer reaction engineering tools to control the microstructure of flocculants are provided and the techniques for the quantification of flocculant microstructure are concisely discussed. This is followed by a review of the methods used for the characterization of particle‐polymer force measurement, and flocculation/dewatering assessment with attention to the characterization of aggregate structures.

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Section: Performance Assessment Of Flocculantsmentioning

confidence: 99%

Water Soluble Polymer Flocculants: Synthesis, Characterization, and Performance Assessment

Vajihinejad

Gumfekar

Bazoubandi

et al. 2018

Macro Materials & Eng

137

108

View full text Add to dashboard Cite

show abstract

“…The pulp was mixed for 2 min and then the flotation began. For each flotation test, the total flotation time was 4 min, and the concentrate was collected in batches using flotation times of 30,30,30,30,30,30, and 60 s. The hydrophobic flocs could be mostly recovered and a stable flotation recovery could be obtained by appropriately prolonging the flotation time in the final stage of the flocculation flotation. The concentrate and tails were subsequently collected, filtered, and dried.…”

Section: Flotation Testsmentioning

confidence: 99%

Flocs Properties and Flotation Performance of Fine Diaspore with Energy Input Pretreatment Induced Using Sodium Oleate

Liao

2019

Minerals

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Energy input, an important factor affecting flocs properties and flotation performance, has rarely been studied in the field of diaspore flotation, which has severely limited our understanding of the flocculation flotation of fine diaspore. Therefore, in this study, the flocs properties and flotation performance of fine diaspore with energy input pretreatment were studied through flotation kinetics, flocs size measurements, and fractal dimension analysis. The results showed that the flocs size increased and the flocs structure became looser with the increasing energy input, while the flocs size decreased and the structure became compact when the energy input exceeded 10.93 kJ/m 3 . Meanwhile, there were significant differences in the flotation performance under different energy input pretreatment conditions, suggesting that the flotation performance of the fine diaspore was closely related with the flocs properties generated during the agitation process. In particular, the flotation performance was positively correlated with the flocculation degree of flocs, to a certain extent. The flocculation flotation of the fine diaspore benefited from a suitable energy input, and an excessive energy input was not conducive to flotation performance.

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“…Shear yield stress is a measure of the resistance of the floc to the permanent deformation in shear, or the minimum stress needed for the occurrence of flow [21]. The yield stress of the flotation pulp has been proven to be useful in characterizing the particle aggregation degree in the pulp [22].…”

Section: Shear Yield Stress Measurementsmentioning

confidence: 99%

Different Flotation Performance of Ultrafine Scheelite under Two Hydrodynamic Cavitation Modes

Zhou

Shi

et al. 2018

Minerals

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Abstract:In industrial practice, hydrodynamic cavitation (HC) is commonly triggered by jetting either reagent solution or pulp. Although both methods can enhance mineral flotation, are their roles the same? There are few research studies in the field, which severely limits our understanding on mineral flotation combined with HC. Therefore, in this study, the flotation of ultrafine scheelite with HC pretreatments of reagent solution and pulp (abbreviated to be HCPS and HCPP, respectively) was studied and compared through flotation tests, zeta potential analysis, microscope tests, and shear yield stress measurements. The results of flotation tests show that both HCPS and HCPP can enhance the final flotation performance, but in general, HCPP leads to greater improvements on the final flotation recovery. The presence of (hydrophobized) scheelite particles brings extra gas nuclei for the cavitation-flotation system, suggesting that more NBs may be produced in the case of HCPP compared with HCPS. These tiny bubbles remarkably reduce the size distribution of bubbles in the flotation system, thus increasing the particle-bubbles collision probability. Increase in particle aggregation may be another reason why flotation with HCPP results in a higher flotation recovery. The adherence of NBs on hydrophobized particles decreases the (absolute) surface charge of the solids, resulting in a smaller repulsive force among particles and more significant particle aggregation, which is confirmed by the microscope tests and shear yield stress measurements.

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A review of the modern characterization techniques for flocs in mineral processing

Cited by 70 publications

References 120 publications

Water Soluble Polymer Flocculants: Synthesis, Characterization, and Performance Assessment

Water Soluble Polymer Flocculants: Synthesis, Characterization, and Performance Assessment

Flocs Properties and Flotation Performance of Fine Diaspore with Energy Input Pretreatment Induced Using Sodium Oleate

Different Flotation Performance of Ultrafine Scheelite under Two Hydrodynamic Cavitation Modes

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