Removal of226Ra(II) from uranium mining and processing effluents

Stoica, Ligia; Filip, Daniel S.; Filip, G.; Razvan, Anca; Radulescu, R.

doi:10.1007/bf02389462

Cited by 8 publications

(7 citation statements)

References 1 publication

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“…At industrial scale, foams are often employed to separate mineral particles in froth flotation processes [6]. Their use has been extended to various extraction processes such as deinking of aqueous solutions via flotation [7,8], and in the nuclear industry for extraction and concentration of uranium, in aggressive and strongly acidic environments [9,10]. All these examples take benefit of the peculiar features of liquid foams: These foams are mostly composed of gas, so that less than 10% of their volume fraction is water, even less than 5% in the case of dry foams.…”

Section: Introductionmentioning

confidence: 99%

Copper leaching with aqueous foams for the processing of electronic waste

Régnier,

Hubau,

Touzé

et al. 2024

Comptes Rendus. Chimie

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Aqueous foams have been used in various hydrometallurgical processes, and have recently emerged as an alternative technique for the leaching of metallic copper, using hydrochloric acid and O 2 from air as an oxidant. In the present study, we describe how this technique has been successfully applied to the leaching of copper from waste printed circuits boards (WPCBs). First of all, the use of HCl based foams was successfully applied to the leaching of sole copper, and the impact of the size of copper particles was studied. It was demonstrated that use of mixtures of fine and large particles give excellent results. Then, on ground WPCBs, a first classical leaching stage using aqueous HCl solution was performed in order to remove maximum quantity of reducible metals (aluminum, iron, zinc . . . ). Then, almost quantitative copper leaching employing HCl based foam was performed. Copper is almost exclusively leached during this stage, and the complete mass balance in 5 major metals present in WPCBs (aluminum, iron, zinc, nickel and copper) is detailed. Kinetics of the copper leaching were greatly enhanced through addition of substoechiometric quantity of cupric ions at the beginning of the process, so that extensive grinding of the waste is not necessary.

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Section: Introductionmentioning

confidence: 99%

Copper leaching with aqueous foams for the processing of electronic waste

Régnier,

Hubau,

Touzé

et al. 2024

Comptes Rendus. Chimie

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“…They are stabilized by surfactant layers adsorbed at the liquid/air interfaces. Foams are used in a wide range of applications such as water treatment (1) or decontamination (2)(3)(4), where their low liquid volume fraction is advantageous as it enables to reduce the volumes of liquid to be cleaned or recycled. In these processes and in flotation (5)(6)(7)(8)(9)(10)(11)(12), species such as ions (5,6), minerals (7)(8)(9) or radioactive elements (2)(3)(4) adsorb and concentrate at the surface of bubbles, and can then be collected easily as they float atop the aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Relation between oxidation kinetics and reactant transport in an aqueous foam

Trinh

Mikhailovskaya

Lefèvre

et al. 2023

Journal of Colloid and Interface Science

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“…To handle of issues, the integrating system of clarifier using the other system as well as dissolved air flotation (DAF) making appropriate to use in mobile water treatment. DAF systems are technologies in the recent year that has been explored due to accelerating the separation of contaminants, hydrocarbons, minerals, algae, radionuclides, and thickening of activated sludge, among others [6][7][8][9][10]. The separation can be done since the surface interaction between the bubbles and particles and hydrodynamic phenomena [11].…”

Section: Introductionmentioning

confidence: 99%

Flotation of suspended solid by introducing coagulant and fine bubbles in the mobile wastewater treatment plant

Joni

Sofia

Sulistio

et al. 2022

J. Phys.: Conf. Ser.

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Turbidity is an essential process variable in water treatment processes for clean water. This study reports the development of a mobile mini wastewater treatment plant (WTTP) intended to provide clean water in flooding incidents, where access to clean water is demanding. The mobile mini-WTTP employed with a fine bubbles generator aims to provide micro and nano bubbles with longer residence in the water expected to promote an effective flotation process. The system was evaluated in removing suspended solid capability to reduce total suspended solids (TSS) or water turbidity. The system consists of a mesh trap, chemical flocculation, dissolved air flotation chamber, and activated carbon–zeolite as a mineral filter. The system was tested on the suspended solid from homogenized clay resulted from a turbid tap water effluent with adjusted turbidity up to 500 FNU on the storage tank. Alum solution with a dosage of 200 mg/L was used as a coagulant agent. In the flotation process was introduced a fine bubbles generator with a pressurized mechanism. The effluent was pumped from a storage tank into a treatment plant with a flow rate of 200 L/h, and the samples were obtained after the separation from the corresponding sub-system at the condition of steady state of water flow. A digital water quality measurement was operated to evaluate the effluent after the separation process. The results show that the separation of turbidity up to 98% was obtained at the end of the processing system. The successful flotation of the suspended solid due to the zeta potential turn to zero up on the addition of flocculants lead to effective fine bubbles flotation. Finally, clean water was achieved in the performance test of mobile mini WTTP utilized with fine bubbles.

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Removal of226Ra(II) from uranium mining and processing effluents

Cited by 8 publications

References 1 publication

Copper leaching with aqueous foams for the processing of electronic waste

Copper leaching with aqueous foams for the processing of electronic waste

Relation between oxidation kinetics and reactant transport in an aqueous foam

Flotation of suspended solid by introducing coagulant and fine bubbles in the mobile wastewater treatment plant

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