Examination of NaCl and MIBC as bubble coalescence inhibitor in relation to froth flotation

Bournival, Ghislain; Pugh, R.J.; Ata, Seher

doi:10.1016/j.mineng.2011.10.008

Cited by 77 publications

(41 citation statements)

References 53 publications

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“…The frother dosage was lower than that of our present report, which may be attributed to the chloride ions in ash sample used in this study (Liu et al, 2013). A relatively concentrated sodium chloride (NaCl) solution could delay bubble coalescence, thus increasing froth stability (Bournival et al, 2012). Feng reported that heavy metal chloride complexes which were formed and absorbed onto the surface of fly ash could exchange with carbonate ions, which would improve the performance of decarburization flotation (Feng et al, 2015).…”

Section: Decarburization Flotation Resultsmentioning

confidence: 58%

Two-Step Flotation Treatment for Removal of Toxic Matter from Hospital Solid Waste Incinerator Fly Ash

Liu

Wei

et al. 2017

Aerosol Air Qual. Res.

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Application of two-step flotation for removing dioxins and heavy metals from hospital solid waste incinerator (HSWI) fly ash was studied. In the first step, decarburization flotation was executed to remove dioxins from raw fly ash. The second step of precipitation flotation was carried out to recycle the toxic metals in the residual slurry. Finally, an acid leachingsulphide precipitation-flotation method was proposed. The results showed that carbon removal rate was 90.7%, and the dioxin removal percentage was 91.0% during decarburization flotation. And Zn, Pb and Cu in residual slurry were acidleached with the removal efficiencies being 91.3%, 79.2% and 85.6%, respectively. The optimum sulphidation condition of heavy metals in the residual slurry were Na 2 S molar ratio of 1.4 and sulphidation time of 30 min. Subsequently, precipitation flotation could recover 49.9% of Zn, 42.0% of Pb and 48.7% of Cu from the raw fly ash. After the two-step flotation, the toxicity of the tailings reduced considerably, and the tailings could be disposed in landfill. Therefore, this twostep flotation treatment of HSWI fly ash may result in both detoxification and potential resource recovery.

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Section: Decarburization Flotation Resultsmentioning

confidence: 58%

Two-Step Flotation Treatment for Removal of Toxic Matter from Hospital Solid Waste Incinerator Fly Ash

Liu

Wei

et al. 2017

Aerosol Air Qual. Res.

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“…They cover all possible pathways of water transported across the site boundary including ones that are required but often neglected: water entrained in the ore to be processed, water entrained in the tailings that cannot be recovered, water in the product streams that leave the operational facility (Molden and Sakthivadivel, 1999). Although seawater was not an input or output for any of the operations in this study, there are sites that use seawater for flotation (Bournival et al, 2012;Castro et al, 2013) so it has been defined as a source category by the developers of the framework. Within the categories there was flexibility when describing the specific inputs and outputs that comprise each category as shown in Table 5 to Table 8 for the operations.…”

Section: Discussionmentioning

confidence: 99%

The robustness of mine water accounting over a range of operating contexts and commodities

Danoucaras

Woodley

Moran

2014

Journal of Cleaner Production

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Communicating the mining industry's water use is fundamental to maintaining its social license to operate but the majority of corporate reporting schemes list indicators. The Minerals Council of Australia's Water Accounting Framework was designed to assist the minerals industry obtain consistency in its accounting method and in the definitions of terms used in water reporting. The significance of this paper is that it shows that the framework has been designed to be sufficiently robust to describe any mining/mineral related operation. The Water Accounting Framework was applied across four operations over three countries producing four commodities. The advantages of the framework were then evident through the presentation of the reports. The contextual statement of the framework was able to explain contrasting reuse efficiencies. The Input-Output statements showed that evaporation was a significant loss for most of the operations in the study which highlights a weakness of reporting schemes that focus on discharge volumes. The framework method promotes data reconciliation which proved the presence of flows that two operations in the study had neglected to provide. Whilst there are many advantages of the framework, the major points are that the reporting statements of the framework, when presented together, can better enable the public to understand water interactions at a site-level and allows for valid comparisons between sites, regardless of locale and commodity. With mining being a global industry, these advantages are best realised if there was international adoption of the framework.

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“…Inorganic salts are known to significantly influence bubble coalescence in liquids, bubble size and distribution, gas holdup, gas-liquid interfacial area and bubble rise velocity, all of which critically govern many important devices (e.g., bubble columns, distillation towers and bioreactors) and industrial processes (e.g., dissolved air flotation used to prepare seawater fed to desalination plants, and induced air flotation used to recover valuable minerals from the earth's crust) (Bournival et al, 2012;Leja, 1982;Paulson and Pugh, 1996;. The foaminess of ocean waves on the beach exemplifies the significant effect of salts in reducing bubble coalescence in nature.…”

Section: Introductionmentioning

confidence: 99%

Drainage and stability of foam films during bubble coalescence in aqueous salt solutions

Firouzi¹

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Bubble coalescence and thin liquid films (TLFs) between bubbles known as foam films, are central to many daily activities, both natural and industrial. They govern a number of important processes such as foam fractionation, oil recovery from tar sands and mineral recovery by flotation using air bubbles. TLFs are known to be stabilized by some salts and bubble coalescence in saline water can be inhibited at salt concentrations above a critical (transition) concentration. However, the mechanisms of the inhibiting effect of these salts are as yet contentious. The aim of this work is to characterise the behaviour of saline liquid films both experimentally and theoretically to better understand the mechanisms.The effect of sodium halide and alkali metal salts including NaF, NaBr, NaI, NaCl, KCl and LiCl on the stability of a foam film was investigated by applying the TLF interferometry method. To mimic realistic conditions of bubble coalescence in separation processes, the drainage and stability of TLFs were studied under non-zero bubble (air-liquid interface) approach speeds (10-300 µm/s) utilizing a nano-pump. For each of the salts studied, a critical concentration (Ccr) above which liquid films lasted for up to 50 s depending on the salt type, concentration and the interface approach speed, was determined. For concentrations below Ccr, the saline liquid films either ruptured instantly or lasted for less than 0.2 s. Ccr follows the order NaF

show abstract

Examination of NaCl and MIBC as bubble coalescence inhibitor in relation to froth flotation

Cited by 77 publications

References 53 publications

Two-Step Flotation Treatment for Removal of Toxic Matter from Hospital Solid Waste Incinerator Fly Ash

Two-Step Flotation Treatment for Removal of Toxic Matter from Hospital Solid Waste Incinerator Fly Ash

The robustness of mine water accounting over a range of operating contexts and commodities

Drainage and stability of foam films during bubble coalescence in aqueous salt solutions

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