Passivation of pyrite due to surface treatment

Lalvani, Shashi B.; DeNeve, Barbara A.; Weston, Alan

doi:10.1016/0016-2361(90)90209-9

Cited by 28 publications

(14 citation statements)

References 9 publications

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“…Pyrrhotite can be stabilized in combination with a binder (such as cement), neutralizers, bactericides or surfactants to form agglomerates (Amaratunga, 1991;Hmidi and Amaratunga, 1998). It is also suspected that the oxidation of pyrrhotite could be partially or totally inhibited through surface treatments (coating agents) similar to those suggested for pyrite (Lalvani et al, 1990(Lalvani et al, , 1991Belzile et al, 1997b;Lan et al, 2002).…”

Section: Prevention and Remediationmentioning

confidence: 96%

A review on pyrrhotite oxidation

Belzile

Chen

Cai

et al. 2004

Journal of Geochemical Exploration

271

151

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Section: Prevention and Remediationmentioning

confidence: 96%

A review on pyrrhotite oxidation

Belzile

Chen

Cai

et al. 2004

Journal of Geochemical Exploration

271

151

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“…The oxidant can be inhibited at pyrite particle surfaces by a surface barrier through the formation of passivation layers [2,3,[7][8][9][10] and some coating agents, e.g. acetyl acetone, humic acids, ammonium lignosulfonates, oxalic acid and sodium silicate, were reported to be employedfor pyrite surface treatmentbut only minor reductions in pyrite oxidation rates resulted [1,3,9,11]. Huminicki and Rimstidt [12] reported that precipitation of iron hydrox-ide particle reduced oxidant's diffusion coefficient by more than five orders of magnitude.…”

Section: Introductionmentioning

confidence: 99%

Effect of pH and Dissolved Silicate on the Formation of Surface Passivation Layers for Reducing Pyrite Oxidation

Zeng¹,

Li²,

Schumann³

et al. 2013

CWEEE

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Acid mine drainage (AMD)and toxic metal release generated by oxidation of sulphide minerals, particularly pyrite, in mine wastes, are a critical environmental issue worldwide. Currently, there are many options to diminish sulphide oxida-tion including barrier methods that isolate pyrite from oxygen or water, chemical additives and inhibition of iron-oxidizing bacteria. This study focuses on understanding the role that silicate and pH conditions play in the formation and stabilisation of pyrite surface passivation layers found in lab and field studies. The results from pyrite dissolution tests under various conditions showed that the pyrite oxidation rate has been reduced by up to 60% under neutral pH with additional soluble silicate. Solution speciation calculation predicted that crystalline goethite is formed in the experiment without silicate additionbutan amorphous iron hydroxide surface layer is stabilized by the addition of the silicate, inhibiting goethite formation and continuing pyrite oxidation. This coherent, continuous amorphous layer has been verified in SEM.

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“…Additional studies has been focused on the phospholipid 23:2 Diyne PC, commercialised by Avanti Polar Lipids as a covering product which creates a polar layer onto the iron sulphate surface (15)(16). Siloxanes and other organic covering compounds are being explored (17). The electrolytic covering of the pyrite surface for passivation purposes (18) and synthetic resins to protect pyrite museum specimens from the sunlight and UV radiation (19) are additional interesting suggestions.…”

Section: Protection Methodologymentioning

confidence: 99%

“…El oleato de sodio también crea una capa hidrofóbica que protege la superficie del sulfuro de hierro evitando el contacto con el oxígeno del agua (14). También se ha estudiado un fosfolípido (23:2 Diyne PC, comercializado por Avanti Polar Lipids) como agente recubridor que crea una capa de marcado carác-ter polar sobre la superficie del sulfuro de hierro (15)(16), así como siloxanos y otros compuestos protectores (17). Otros caminos explorados son el recubrimiento catiónico de la pirita utilizando electrólisis (18) o el uso de resinas sintéticas para proteger ejemplares de piritas expuestas en museos frente a la acción de los rayos UV (19).…”

Section: Métodos De Protecciónunclassified