Effect of surfactants on the cementation of cadmium

Taha, A.A.; El-Ghani, S.A.H. Abd

doi:10.1016/j.jcis.2004.07.023

Cited by 22 publications

(12 citation statements)

References 15 publications

(15 reference statements)

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“…In the most modern zinc production plants [14][15][16][17][18], these metallic impurities were removed by adding activators in view to enhance the cementation kinetics. Antimony and antimony compounds such as Sb, KSbC 4 H 2 O 6 ·1.5H 2 O, Na 3 SbS 4 ·9H 2 O, Sb 2 O 3 , Zn-Al, Zn-Ca alloys, Zn-Sb-graphite, Cd-Cu-Sb, arsenic salts As 2 O 3 , etc.…”

Section: Introductionmentioning

confidence: 99%

Mass transfer correlation of simultaneous removal by cementation of nickel and cobalt from sulfate industrial solution containing copper

Dib¹,

Makhloufi²

2007

Chemical Engineering Journal

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Section: Introductionmentioning

confidence: 99%

Mass transfer correlation of simultaneous removal by cementation of nickel and cobalt from sulfate industrial solution containing copper

Dib¹,

Makhloufi²

2007

Chemical Engineering Journal

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“…Cu 2+ and Cd 2+ concentrations were determined in a Varian 720-ES optical emission spectroscopy apparatus with inductively coupled plasma (ICP-OES). It is generally agreed that the rate controlling step in the cementation process is the diffusion of copper ions towards the zinc surface [1,2,[4][5][6][14][15][16][17][18][19][20]. Kinetics of the cementation process is usually expressed by Equation 4, which describes the variation of the copper concentration with time.…”

Section: Chemical Analysismentioning

confidence: 99%

Kinetics of Copper and Cadmium Cementation by Zinc Powder

Oliveira¹,

Penna²,

Magalhães³

et al. 2019

TMM

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The cementation of copper and cadmium by zinc powder was investigated in order to assess the influence of different parameters in the process. The results showed that the process follows a first order reaction with two stages in both systems. In the system Cu/Zn, the second stage is faster than the first while in the system Cd/Zn the second stage is slower than the first. In the system Cu/Zn, the variation on the surface area of copper cement followed a power law and a straight line was obtained by plotting-ln([Cu 2+ ]/[Cu 2+ ] 0) against t 3/2 , the activation energy was calculated as 16.3kJ. In the system Zn/Cd the surface area available for reaction decreased as a result of the cement agglomeration. On the experiments carried out with ions Cu 2+ and Cd 2+ in solution, purer copper cement was obtained when the experiments were carried out in the presence of less than stoichiometric amount of zinc powder and longer reaction times.

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“…8 The continued removal of copper ions with time indicates that the deposited copper layer is porous and allows copper ions to diffuse through it to react with zinc. Figure 1 also indicates that cementation reaction is a first-order reaction, which was verified by other authors.…”

Section: ¹1mentioning

confidence: 99%

“…4,8,16 3.6 Morphological study Scanning electron Microscopy (SEM) was used to examine the morphology of the cemented copper. This examination confirmed the change in the Zn beads surface as a consequence of the cementation process.…”

Section: Data Correlationmentioning

confidence: 99%

Recovery of Copper from Synthetic Solution by Cementation on Moving Bead of Zinc Spheres

et al. 2014

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This work deals with the cementation of copper from sulfate solution on moving zinc beads as sacrificial metal using magnetic stirring. The efficiency of zinc beads in copper recovery has been estimated in terms of kinetic and apparent mass transfer coefficients according to operating parameters such as initial copper ion concentration, rotational speed, zinc beads diameter as well as temperature. Kinetic investigation showed that the copper cementation reaction follows a first order reaction and the activation energy was calculated. The rate of diffusion controlled cementation of copper ions was expressed in terms of the mass transfer coefficient; the data were correlated with the following dimensionless correlation: Sh = 0.7485 Sc . The resulting samples of zinc beads surface and copper precipitate were characterized by two analysis methods, scanning electron microscopy (SEM) and X-Ray (EDX) which confirmed that about 99% of copper can be recovered from the sulfate solution.

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Effect of surfactants on the cementation of cadmium

Cited by 22 publications

References 15 publications

Mass transfer correlation of simultaneous removal by cementation of nickel and cobalt from sulfate industrial solution containing copper

Mass transfer correlation of simultaneous removal by cementation of nickel and cobalt from sulfate industrial solution containing copper

Kinetics of Copper and Cadmium Cementation by Zinc Powder

Recovery of Copper from Synthetic Solution by Cementation on Moving Bead of Zinc Spheres

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