Removal of Lead Hydroxides Complexes from Solutions Formed in Silver/Gold: Cyanidation Process

Parga, José R.; Martinez, Raul Flores; Moreno, Héctor; Gomes, Andrew; Cocke, David L.

doi:10.1007/s11663-013-9962-1

Cited by 2 publications

(1 citation statement)

References 32 publications

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“…[1] Due to its cost, it is incentive to recover it from waste solutions. There are many technologies involving chemical and physical processes which have been developed over the past years to remove hazardous metal ions, such as chemical precipitation, [2,3] adsorption, [4][5][6][7][8][9][10][11][12] ion exchange, [13,14] electrochemical technique, [15][16][17] , and membrane processes, [18][19][20] ; however, all of them have drawbacks. Chemical precipitation requires extremely long settling time and produces a large amount of sludge; ion exchange and adsorption are expensive and require frequent regeneration; and membrane processes suffer from operational problems due to fouling of membranes which can be reduced by several approaches, e.g., by feed pretreatment and treatment of the membrane surface.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Copper from Effluents by Cementation on Aluminum in a Multirotating Cylinder-Agitated Vessel

Abdel‐Aziz

El-Ashtoukhy

Bassyouni

2015

Metall Mater Trans B

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Recovery of copper from synthetic waste solution using cementation technique in a new agitated vessel employing multirotating aluminum cylinders impeller was investigated. Parameters studied are cylinder diameter, rotation speed, initial copper ion concentrations, and effect of surfactants. Solution analysis and scanning electron microscopy were employed to investigate the kinetic and mechanism of the process. The rate of recovery was found to be at its maximum value at the operating conditions of 350 rpm rotation speed, 5000 ppm initial CuSO 4 concentration, and 1.2 cm cylinder diameter. All data were correlated by the dimensionless equation: Sh ¼ 1:16Sc 0:33 Re 0:63 d c L 0:54 ;with an average deviation of ±8.5 pct and a standard deviation of 5.88 pct. Presence of nonylphenol ethoxylate surfactant in the solution decreased the rate of recovery by an amount ranging from 2.94 to 38.57 pct depending on the operating conditions. The present geometry gave higher rates of recovery compared to both the single rotating cylinder and rotating disc reactor.

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Section: Introductionmentioning

confidence: 99%

Recovery of Copper from Effluents by Cementation on Aluminum in a Multirotating Cylinder-Agitated Vessel

Abdel‐Aziz

El-Ashtoukhy

Bassyouni

2015

Metall Mater Trans B

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Preparation of quaternary ammonium–Chlorella vulgaris and its adsorption of Ag(CN)2−

Guo

Xie

et al. 2015

Water Science and Technology

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A novel anion exchange resin, quaternary ammonium-Chlorella vulgaris (QACV), was prepared by introducing quaternary ammonium groups onto dried Chlorella vulgaris as base material. Degrees of epoxy, amine and quaternary ammonium groups of QACV were measured. Water retention, optical microscopy, and Fourier transform infrared spectrometry were used to characterize QAVC. The adsorption behavior of QACV towards Ag(CN)2- in different conditions was studied carefully. The results showed that QAVC was efficient to adsorb Ag(CN)2- at pH 9-11, and adsorption equilibrium was almost reached in 30 min. Both kinetics and isotherm parameters in the adsorption process were obtained. The data indicated that the pseudo-second-order model provided a good correlation for adsorption of Ag(CN)2- on QACV and the calculated rate constant of the adsorption was 3.51 g/(mmol min). The equilibrium data fitted well in the Langmuir isotherm and the estimated maximum adsorption capacity qm was 1.96 mmol/g. The dimensionless separation factor RL was between 0 and 1, suggesting that the adsorption process of Ag(CN)2- using QACV was favorable. The QACV could be used successively three times without significantly affecting its adsorption efficiency. Chlorella vulgaris was a potential base material to be modified with quaternary ammonium groups to prepare an adsorbent for adsorption of Ag(CN)2-.

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Removal of Lead Hydroxides Complexes from Solutions Formed in Silver/Gold: Cyanidation Process

Cited by 2 publications

References 32 publications

Recovery of Copper from Effluents by Cementation on Aluminum in a Multirotating Cylinder-Agitated Vessel

Recovery of Copper from Effluents by Cementation on Aluminum in a Multirotating Cylinder-Agitated Vessel

Preparation of quaternary ammonium–Chlorella vulgaris and its adsorption of Ag(CN)2−

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