Hydrometallurgical application for treating a Nigerian chalcopyrite ore in chloride medium: Part I. Dissolution kinetics assessment

Baba, Alafara A.; Ayinla, Kuranga I.; Adekola, Folahan A.; Bale, Rafiu B.; Ghosh, Malay Kumar; Alabi, Abdul G. F.; Sheik, Abdul Rauf; Folorunso, Ismael O.

doi:10.1007/s12613-013-0829-x

Cited by 20 publications

(13 citation statements)

References 17 publications

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“…Other phases include: (5) SnO 2 (cassiterite) {21 -1250}; (6) SiO 2 (α-quartz) {05-0490}; (7) Galena (PbS); {05-0792}; (8) CaCO 3 .MgCO 3 (dolomite) {05-0490} and (9) Hausmannite (Mn 3 O 4 ) {24-07340}. It is important to note that the compounds (5) to (9) occurred in low to trace levels (Ayinla, 2012;Baba et al 2013). …”

Section: Resultsmentioning

confidence: 99%

“…where α is the fraction reacted, K c is the kinetic constant, M B is the molecular weight of the solid, C A is the concentration of the dissolved lixiviant, A is the bulk of the solution, a is the stoichiometric coefficient of the reagent in the leaching reaction, r 0 is the initial radius of the solid particle, t is the reaction time, D is the diffusion coefficient in the porous product layer, ρ b is density of the solid and K d and K s are rate constants (Ayinla, 2012;Baba et al 2012Baba et al , 2013Baba and Adekola, 2010;Fabiano et al 2010).…”

Section: Discussionmentioning

confidence: 99%

“…This has been the great achievement that revolutionized copper compound production all over the world and enabled to introduce hydrometallurgy for industrial scale (Szymanowski, 1996). It is evident that leaching is an important operation during solvent extraction of copper prior to its beneficiation (Baba et al 2013). …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Quantitative leaching of a Nigerian chalcopyrite ore by nitric acid

Alafara

Kuranga²,

Rafiu³

et al. 2015

Bayero J. Pure App. Sci.

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Due to increasing uses of copper nitrate, Cu(NO 3 ) 2 , as catalysts, textile and polishing agents for other metals, experiment on the leaching of a Nigerian chalcopyrite ore by nitric acid for possible production of copper nitrate was examined. The effects of acid concentration, temperature and particle size on the dissolution rates of chalcopyrite ore have been investigated. Distribution of elements, compounds present within the ore particle size -90 + 75 µm was initially determined by X-ray Fluorescence (XRF), X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) to provide basis for explaining the dissolution process. It was observed that dissolution rates were greatly affected by acid concentration, temperature and particle diameter. Kinetic data analysis showed that the dissolution mechanism followed diffusion as the rate controlling step. The reaction order was calculated to be 0.51 while the activation energy was deduced to be 29.99 kJmol -1 from the dissolution data. The X-ray diffraction analysis of the unleached residue at optimal leaching showed that it contains α-quartz (α-SiO 2 ) and Tin oxide (SnO 2 ).

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Quantitative leaching of a Nigerian chalcopyrite ore by nitric acid

Alafara

Kuranga²,

Rafiu³

et al. 2015

Bayero J. Pure App. Sci.

View full text Add to dashboard Cite

show abstract

“…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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“…Therefore, due to the ease of interaction with metal ions such as copper to form neutral complex species [16], it is important to consider this extractant as a viable alternative for the hydrometallurgical treatment of a chalcopyrite leach liquor of Nigerian origin by solvent extraction. The detailed characterization and kinetic data of this ore have been recently reported [17]. …”

Section: Introductionmentioning

confidence: 99%