Extraction of Co(II) from aqueous solution using emulsion liquid membrane

The transport of cobalt(II) from acidic sulphate solutions through PEHFSD was investigated using the extractant DP-8R in Exxsol D100. The acidic feed solution containing Co(II) was passed through the tube side, and pseudo-emulsions of DP-8R/Exxsol D100 and sulphuric acid was passed through the shell side in counter-current mode, using a single microporous hydrophobic polypropylene hollow fiber contactor for extraction and stripping. In PEHFSD the aqueous strip (sulphuric acid) solution was dispersed in the organic membrane solution in a reservoir tank with an impeller stirrer to form a strip dispersion. This pseudo-emulsion phase is circulated from the tank to the membrane module to provide a constant supply of the carrier solution to the membrane micropores. Several hydrodynamic and chemical parameters, such as variation in feed pH (3-7), cobalt concentration in feed (0.17-1.7x10 -3 M), carrier concentration (0.16-1.28 M), etc., were investigated. Mass transfer modelling was performed and the validity of the model was evaluated with experimental data. Moreover, the system was 2 applied in the cobalt purification of synthetic lithium solutions derived from the processing of rechargeable batteries, with cobalt/lithium separation factor values around 25.

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“…Thus, there are investigations to separate cobalt(II) from aqueous environments using liquid membrane technologies [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Cobalt(II) membrane-extraction by DP-8R/Exxsol D100 using pseudo-emulsion based hollow fiber strip dispersion (PEHFSD) processing

Alguacil¹,

García‐Díaz²,

López³

et al. 2011

Separation and Purification Technology

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“…Treatment of simulated secondary wastes from the decontamination process by semi-permeable membrane techniques were investigated by Dulama et al [44]. The study showed that increased efficiencies for Cs removal were obtained by using natural zeolite in pretreatment stage and this was attributed to the special affinity of this material for Cs.…”

Section: Miscellaneous Methodsmentioning

confidence: 99%

Liquid Radioactive Wastes Treatment: A Review

Rahman

Ibrahium

Hung

2011

Water

333

118

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Radioactive wastes are generated during nuclear fuel cycle operation, production and application of radioisotope in medicine, industry, research, and agriculture, and as a byproduct of natural resource exploitation, which includes mining and processing of ores, combustion of fossil fuels, or production of natural gas and oil. To ensure the protection of human health and the environment from the hazard of these wastes, a planned integrated radioactive waste management practice should be applied. This work is directed to review recent published researches that are concerned with testing and application of different treatment options as a part of the integrated radioactive waste management practice. The main aim from this work is to highlight the scientific community interest in important problems that affect different treatment processes. This review is divided into the following sections: advances in conventional treatment of aqueous radioactive wastes, advances in conventional treatment of organic liquid wastes, and emerged technological options.

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“…The different size must be caused by the difference of emulsion composition. Nevertheless, most of investigators revealed that the size of internal droplets decreased with the increase of the emulsification speed and time up to a certain level by maintaining other parameters remain constant [16,[20][21][22][23][24][25]. Venkatesan and Begum [21,22] prepared W/O emulsion at 2,000-12,000 rpm for 2-10 min using a high-speed homogenizer.…”

Section: High Shear Agitationmentioning

confidence: 99%

“…In their conclusion, the optimum conditions could be achieved around emulsification speed 10,000 rpm for 6 min which gave lower breakage. Gasser et al [25] performed emulsification with an ultra high speed dispeser at 3,000-8,000 rpm during 2-10 min for extraction of Co(II) from aqueous solution and found that the lower breakage was obtained for a speed of 7,000 rpm and an emulsification time of 5 min. For insufficient emulsification time, the breakage is high because the droplets have a large size, which leads to their coalescence.…”

Section: High Shear Agitationmentioning

confidence: 99%