The activation of sphalerite by lead — a flotation perspective

Trahar, W.J.; Senior, G.D.; Heyes, Graeme W.; Creed, M.D.

doi:10.1016/s0301-7516(96)00041-5

Cited by 63 publications

(9 citation statements)

References 17 publications

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“…When dissolved, sphalerite, which contains average amounts of Cd up to ca. 0.5% (Table 1) 14B) coating primary galena or sphalerite can be compared to the activation stage during flotation (Finkelstein, 1997), by copper ions (Pattrick et al, 1999), lead ions (Trahar et al, 1997) or cadmium ions (Ralston and Healy, 1980). The local variations of the level of the water table due to seasonal or tectonic effects may be responsible for short intervals of reducing conditions that facilitate the precipitation of supergene secondary sulfides.…”

Section: Supergene Stage Imentioning

confidence: 99%

Non-sulfide zinc deposits of the Moroccan High Atlas: Multi-scale characterization and origin

Choulet

Charles

Barbanson

et al. 2014

Ore Geology Reviews

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International audienceSix non-sulfide Zn-Pb ore deposits were investigated in the Moroccan High Atlas, to understand processes and timing of their formation. Sulfide and non-sulfide ores are hosted in Lower Jurassic reefal to para-reefal limestone. Zn (Pb) carbonates, Zn silicates and associated hydrated phases directly replace the stratabound primary ore bodies or fill cavities along fractures related to the Atlasic compression. Field observation has been complemented by a multidisciplinary approach (e.g. XRD, Raman, SEM, EPMA) for the mineralogical characterization. All six ore deposits present similar parageneses revealing three successive stages for ore deposition: 1) formation of the protore sulfides, 2) early supergene weathering with formation of Zn-Pb-bearing carbonates and iron oxi-hydroxides and 3) late supergene weathering with deposition of Zn-carbonates, Zn-silicates and hydrated phases. Direct replacement of primary sulfides is accompanied by precipitation of zinc non-sulfide minerals in cavities or internal sediments filling. The proposed three-step scenario can be placed within the tectonic evolution of the Moroccan High Atlas belt. Deposition of primary sulfides is contemporaneous with opening of the Tethyan and Atlantic oceans. During the Tertiary, intracontinental deformation has given rise to the High Atlas fold-and-thrust belt and to regional uplift. As a result, Zn-Pb sulfides, hosted in carbonates experienced oxidation under an arid climate to form karst-related Zn-Pb non-sulfide ore bodies

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Section: Supergene Stage Imentioning

confidence: 99%

Non-sulfide zinc deposits of the Moroccan High Atlas: Multi-scale characterization and origin

Choulet

Charles

Barbanson

et al. 2014

Ore Geology Reviews

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“…and H ? to bind with amine and tripolyphosphoric groups, so at low pH lots of adsorption sites are protonated, and sorption capacity of chitosan macro size particles and chitosan nanosize particles for Zn will reduce (Trahar et al 1997). Adsorption of metal ions depends largely on protonation or non-protonation of amine and phosphoric groups of chitosan nano particles (Sreejalekshmi et al 2009).…”

Section: Morphology Of Chitosan and Chitosan Nano Particlesmentioning

confidence: 99%

Application of nanochitosan and chitosan particles for adsorption of Zn(II) ions pollutant from aqueous solution to protect environment

Seyedmohammadi

Motavassel

Maddahi

et al. 2016

Model. Earth Syst. Environ.

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Existence of heavy metals like zinc within water source is considered as one of the most important environmental problems. Accumulating within alive tissues, zinc raises various diseases and disorders. Chitosan is a hydrophilic polymer which is raised from acetyl groups of chitin from alkaline solution: it is employed widely as a well-known adsorbent for removing heavy metal ions. Present study aimed at optimizing the production of chitosan nano size particles by method of calvo and compared the adsorption of Zn (II) ions by chitosan macro and nano size particles. Adsorption experiments were conducted in a batch system and the effects of temperature, pH, contact time and initial concentration of metal ions on productivity of adsorption of zinc ions have been considered. Performing analysis DLS revealed that mean size of nano chitosan particles is 19.84 nm. Optimal adsorption by chitosan and nano chitosan has been done in pH 7 and about of 5. Efficiencies of both adsorbent were increased by increasing contact time. Both adsorbent had maximum efficiency at the temperature of 25°C. At the concentration of 10 mg/ L of zinc metal ions, maximum effective removal of chitosan macro and nano size particles were 90.80 and 99.10 %, respectively. Maximum capacity of adsorption by chitosan macro and nano size particle was 196.07 and 370.37 mg/g, respectively. Adsorption kinetics followed a pseudo second order model. Nanochitosan compared to chitosan particles had higher removal efficiency for Zinc metal ions due to nano size of particles, larger adsorption surfaces and more functional groups.

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“…Los resultados se muestran en la figura 7, en la que se presenta el ángulo de contacto en función de la concentración de Pb(II), observándose que independientemente de la atmósfera empleada en el acondicionamiento (i.e., aire o N 2 ), el ángulo de contacto se incrementa a medida que la concentración de la especia activadora aumenta en la solución, de acuerdo al mecanismo que describe la siguiente reacción [10] :…”

Section: Activación De Esfalerita Con Pb(ii)unclassified

“…El mismo comportamiento se observa con la esfalerita activada con Pb(II) y acondicionada con XINa, donde se obtienen ángulos de 37° y 51°, respectivamente, lo que evidencia el efecto benéfico de la presencia de oxígeno. El mayor ángulo de contacto observado en atmósferas de aire respecto al observado en atmósferas de nitrógeno, se puede explicar, de acuerdo con Trahar y col. [10] , en términos del papel catalizador que el Pb 2+ pudiera jugar en la reacción de oxidación del mineral para…”

Section: Activación De Esfalerita Con Pb(ii)unclassified

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Estudio de los mecanismos de activación de la esfalerita con Cu(II) y Pb(II)

Dávila-Pulido

Salas

2011

REVMETAL

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ResumenEste artículo presenta los resultados de un estudio experimental sobre la activación de esfalerita (ZnS) con Cu(II) y Pb(II), cuyo objetivo principal consistió en investigar los mecanismos de activación y en evaluar la magnitud relativa de la hidrofobización alcanzada con ambas especies químicas. La hidrofobicidad que la superficie mineral adquiere como resultado de la interacción con los activadores y colectores tipo xantato (ditiocarbonatos alquílicos, R-O-CS 2 -), se caracteriza mediante la técnica del ángulo de contacto. Los resultados muestran que el Cu(II) es intercambiado por el Zn de las capas exteriores del cristal, promoviendo la oxidación de sulfuro (S 2-) para producir una mezcla de CuS, Cu 2 S y S°, de naturaleza hidrofóbica. La interacción posterior con el xantato, hace que la hidrofobicidad de la superficie se incremente. Por su parte, la activación con Pb(II) se debe a la formación de una capa de PbS, la cual reacciona espontáneamente con el xantato para producir especies hidrofóbicas (e.g., PbX 2 ). Se observa que la hidrofobización de la esfalerita acondicionada con Pb(II) se favorece en atmósferas de aire, en comparación con la obtenida en atmósfe-ras de nitrógeno. Se concluye que la hidrofobización alcanzada de manera inadvertida con el Pb(II), puede llegar a ser del mismo orden de magnitud que la hidrofobización inducida deliberadamente mediante la activación con cobre. Palabras claveEsfalerita; Activación con Cu; Activación con Pb; Flotación; Angulo de contacto. Contact angle study on the activation mechanisms of sphalerite with Cu(II) and Pb(II) AbstractThis article presents results of an experimental study on the sphalerite activation with Cu(II) and Pb(II), whose main objective was to investigate the activation mechanisms and to evaluate the magnitude of the hydrophobization achieved with both chemical species. The hydrophobicity acquired by the mineral due to the interaction with the activator and collector (sodium isopropyl xanthate) is characterized making use of the contact angle technique. The results show that Cu(II) replaces the Zn of the external layers of the mineral, promoting the sulfide (S 2-) oxidation to produce a mixture of CuS, Cu 2 S and S°, of hydrophobic nature. The subsequent interaction with xanthate increases the hydrophobicity of the mineral surface. In turn, Pb(II) activation of sphalerite is due to the formation of a PbS layer that reacts with xanthate to produce hydrophobic species (e.g., PbX 2 ). It is also observed that the hydrophobicity of sphalerite activated with Pb(II) is favored under air atmospheres, as compared to that obtained under nitrogen atmospheres. It is concluded that the hydrophobicity achieved by lead activation may be of the same order of magnitude to that deliverately induced by copper activation.

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The activation of sphalerite by lead — a flotation perspective

Cited by 63 publications

References 17 publications

Non-sulfide zinc deposits of the Moroccan High Atlas: Multi-scale characterization and origin

Non-sulfide zinc deposits of the Moroccan High Atlas: Multi-scale characterization and origin

Application of nanochitosan and chitosan particles for adsorption of Zn(II) ions pollutant from aqueous solution to protect environment

Estudio de los mecanismos de activación de la esfalerita con Cu(II) y Pb(II)

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