Kinetics of sulfuric acid leaching of cadmium from Cd–Ni zinc plant residues

Safarzadeh, M. Sadegh; Moradkhani, Davood; Ilkhchi, Mehdi Ojaghi

doi:10.1016/j.jhazmat.2008.07.082

Cited by 60 publications

(15 citation statements)

References 12 publications

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“…The separated solids during each stage are called ZPR. A flow sheet which explains each purification stage in NILZ plant is reported in literature [34].…”

Section: Materials and Reagentsmentioning

confidence: 99%

“…The results indicated that the ZPR was mostly composed of zinc, calcium, manganese and cobalt. In the previous researches, the mineralogical characterization of ZPR for zinc compounds have been identified as follows: (Zn,Cu) 2 (AsO 4 )OH), zinc oxysulphate (Zn 3 O(SO 4 ) 2 ) [16], hydrated zinc sulfate (ZnSO 4 ·XH 2 O) [16,18,19], hydrated zinc sulfite (ZnSO 3 ·2.5H 2 O) [16,34], zinc oxide (ZnO) [34], zinc ferrite (ZnFe 2 O 4 ) [18]. Different compounds of zinc was detected from different (Figure 2).…”

Section: Materials and Reagentsmentioning

confidence: 99%

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Kinetic Analysis of Isothermal Leaching of Zinc from Zinc Plant Residue

Hollagh¹,

Alamdari²,

Moradkhani³

et al. 2013

IJNM

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The sulfuric acid leaching of zinc plant residues was studied in an attempt to find a suitable hydrometallurgical method for zinc recovery. The parameters evaluated consist of reaction time, Solid-to-liquid-ratio, reaction temperature, agitation rate and pH. The results of kinetic analysis of the leaching data under various experimental conditions indicated that there is a reaction controlled by the solution transport of protons through the porous product layer with activation energy of about 1 kJ/mol for different constant solid to liquid ratios. Based on the shrinking core model (SCM), the following semi-empirical rate equation was established: obtained from a model-free method using isothermal measurements. Values for activation energy were calculated as a result of the conversion function with an average of 2.9 kJ/mol. This value is close to that determined previously, using shrinking core model (SCM).

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“…The separated solids during each stage are called ZPR. A flow sheet which explains each purification stage in NILZ plant is reported in literature [34].…”

Section: Materials and Reagentsmentioning

confidence: 99%

Section: Materials and Reagentsmentioning

confidence: 99%

Kinetic Analysis of Isothermal Leaching of Zinc from Zinc Plant Residue

Hollagh¹,

Alamdari²,

Moradkhani³

et al. 2013

IJNM

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“…In the literature, it is stated that the diffusion-controlled heterogeneous reactions (Equation (3)) are slightly dependent on temperature, while the chemically controlled processes (Equation (2)) are strongly dependent on temperature. In addition, the activation energy of a diffusion-controlled process is usually below 40 kJ/mol, while for a chemically controlled reaction, this value is usually greater than 40 kJ/mol [43][44][45][46][47][48]. To apply the reaction-controlling equation adequately for this study, the authors considered these two statements.…”

Section: Kinetics Of Copper Leaching For the Mechanically Activated Cusmentioning

confidence: 99%

Effect of Mechanical Activation on the Kinetics of Copper Leaching from Copper Sulfide (CuS)

Lee

Kim

et al. 2018

Metals

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Abstract:The effect of mechanical activation on the copper leaching of copper sulfide, CuS, in 1 M HNO 3 (slurry density: 10 g/L) was investigated by analysis of the leachability and the apparent activation energy. Mechanical activation produced an increase in the leachability and a decrease of the activation energy in this leaching reaction. The leachability increased proportionally to the degree of mechanical activation, reaching 96.6% leaching within 60 min at 80 • C from CuS ground at 700 rpm for 15 min. This leaching process was controlled by surface chemical reaction following the shrinking-core model. The apparent activation energy of leaching for CuS (71.5 kJ/mol) in the range of 50 to 80 • C decreased with an increase of the degree of mechanical activation, reaching 44.3 kJ/mol for Cu leaching from CuS ground at 700 rpm for 15 min.

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“…However, there are few reports on the hydrometallurgy of ZLRs. Hydrometallurgy of ZLRs are mineral phases dependent and are specific to the desired metals; for instance, sulfuric acid was proposed as a better leaching agent for Zn leaching and brine leaching was reported for the maximum leaching of Pb from ZLRs . Hydrometallurgical extraction also has some limitations such as the use of toxic chemicals and problems associated with safe disposal of the wastes.…”

Section: Introductionmentioning

confidence: 99%

Bioleaching and selective biorecovery of zinc from zinc metallurgical leach residues from the Três Marias zinc plant (Minas Gerais, Brazil)

Sethurajan

Lens

Rene

et al. 2016

J. Chem. Technol. Biotechnol

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BACKGROUND Gradual depletion of high‐grade ores for heavy metals has encouraged industries to search for alternative methods to recover metals. Wastes generated from metallurgical industries can be used as a secondary resource as it contains high concentrations of metals. RESULTS The bioleaching kinetics and biorecovery of zinc from Zn‐plant leach residues (ZLR), collected from a currently operating Zn‐plant in Três Marias (Minas Gerais, Brazil) were investigated using sulfuric acid producing Acidithiobacillus thiooxidans (A. thiooxidans). Response surface methodology (RSM) with full factorial central composite design (CCD) was applied to optimize Zn bioleaching by A. thiooxidans. The experiments were performed by varying the initial elemental sulfur concentration (5–30 g L−1), pulp density (5–50 g L−1) and initial pH (3.0–4.0 pH units). More than 75% of Zn was extracted from ZLR by A. thiooxidans under optimized conditions (sulfur concentration 25.1 g L−1, pulp density 21.5 g L−1 and initial pH 3.3). The leaching efficiencies of culture supernatant (biogenic sulfuric acid) and chemical sulfuric acid were compared to understand the leaching kinetics. The Zn leaching kinetics of ZLR followed the shrinking core diffusion model. Zn was selectively recovered from the Fe‐rich acidic bioleachate by biogenic sulfide precipitation. Fe was first removed (more than 85% of total Fe in the leachate) by adjusting the initial pH to 5.0, followed by selective Zn biorecovery. CONCLUSIONS Zn (>95%) was selectively recovered from Fe‐depleted ZLR by biogenic sulfides (with 1:1, Zn:biogenic sulfide mass ratio). Biohydrometallurgy can be a potential alternative resource recovery strategy for the selective recovery of Zn from ZLR. © 2016 Society of Chemical Industry

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Kinetics of sulfuric acid leaching of cadmium from Cd–Ni zinc plant residues

Cited by 60 publications

References 12 publications

Kinetic Analysis of Isothermal Leaching of Zinc from Zinc Plant Residue

Kinetic Analysis of Isothermal Leaching of Zinc from Zinc Plant Residue

Effect of Mechanical Activation on the Kinetics of Copper Leaching from Copper Sulfide (CuS)

Bioleaching and selective biorecovery of zinc from zinc metallurgical leach residues from the Três Marias zinc plant (Minas Gerais, Brazil)

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