The interaction of cyanide with pyrite, marcasite and pyrrhotite

Zhao, Changhui; Huang, Dewei; Chen, Jianhua; Li, Yuqiong; Chen, Ye; Li, Weizhou

doi:10.1016/j.mineng.2016.03.015

Cited by 35 publications

(12 citation statements)

References 15 publications

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“…The depressing strength of the three depressants was in the order of NaCN>SMBS>7261A according to the Rct values. These results are in agreement with the literature investigating the effects of these depressants on the flotation of pyrite in sulfide ores (Moslemi and Gharabaghi, 2017;Mu et al, 2016a;Zhao et al, 2016;Boulton et al, 2001;Zhu et a, 2013).…”

Section: Results Of Eis Measurements On Sample Asupporting

confidence: 92%

“…In this study, the adsorption behaviour of three depressants (NaCN, SMBS, and Aero7261A) used mainly for pyrite depression was investigated by the EIS technique. NaCN is known as one of the most common depressants for pyrite in the flotation process (Zhao et al, 2016). Simply, cyanide compounds are dissolved in water according to the following reaction: A(CN)x D A +X + x(CN) -(A: alkali metal, X: the valence of the alkali metal)…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Application of EIS technique to investigate the adsorption of different types of depressants on pyrite

Ertekin¹,

Pekmez²,

Kappes³

et al. 2021

Physicochem. Probl. Miner. Process.

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Section: Results Of Eis Measurements On Sample Asupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Application of EIS technique to investigate the adsorption of different types of depressants on pyrite

Ertekin¹,

Pekmez²,

Kappes³

et al. 2021

Physicochem. Probl. Miner. Process.

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“…The conventional method for processing these ores is to use oxidative pretreatment methods such as pressure oxidation, biological oxidation, chlorination, or roasting . However, these methods may not be suitable for low-grade ores due to the incremental cost of pretreatment and result in additional environmental impacts . In addition to technical and environmental challenges, the use of cyanide in mining is viewed negatively by society and legislation on cyanide use has become increasingly strict globally.…”

Section: Introductionmentioning

confidence: 99%

“…8 However, these methods may not be suitable for low-grade ores due to the incremental cost of pretreatment and result in additional environmental impacts. 9 In addition to technical and environmental challenges, the use of cyanide in mining is viewed negatively by society and legislation on cyanide use has become increasingly strict globally. In some jurisdictions, the use of cyanide is banned entirely.…”

Section: ■ Introductionmentioning

confidence: 99%

Application of Biogenic Thiosulfate Produced by Methylophaga sulfidovorans for Sustainable Gold Extraction

McNeice

Mahandra

Ghahreman

2022

ACS Sustainable Chem. Eng.

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Thiosulfate is an alternative lixiviant that eliminates many environmental and social drawbacks of cyanide leaching used by most gold operations. Biogenic thiosulfate (Bio-TS) was produced by the bacterium Methylophaga sulfidovorans with sodium sulfide as a substrate and used to leach gold powder and gold from an oxide ore. Growth curve studies were used to determine the growth conditions of the bacteria in batch flask conditions regarding pH and inoculum load. The effect of sulfide dosage and addition time on Bio-TS concentration was studied. The optimal conditions for the growth and generation of Bio-TS were determined to be pH 7–8, 30 °C, and in the environment of a sealed flask rotating in a high salinity medium. Production of Bio-TS from sodium sulfide was confirmed by iodometric titration and IC/UV–vis methods. Gold was leached with a maximum extraction efficiency of 61.9% from ore after 24 h at a 10% pulp density, 0.1 L/min air, and 50 °C. Sustainable indicators and green metrics were combined for multicriteria analysis to quantify the sustainability of this novel proposed method relative to cyanidation and thiosulfate gold leaching processes.

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“…Moreover, in high-pH solutions, the electrochemical interaction of metal ions such as Cu 2+ and Pb 2+ may occur on the pyrrhotite surface during the grinding and flotation conditioning processes, which can activate the pyrrhotite flotation and diminish the selective depression, even in the presence of lime [3,19,20]. In addition to pH reagents, other highly toxic chemicals including potassium dichromates, sulfites, sulfur dioxides, and cyanides have also been applied for the inhibition of pyrrhotite flotation [14,16,21]. These depressant reagents have shown to be more effective in rejecting pyrrhotite; however, their applications are limited by environmental or economic concerns [22,23].…”

Section: Introductionmentioning

confidence: 99%

The Depression and Adsorption Mechanism of Polyglutamic Acid on Chalcopyrite and Pyrrhotite Flotation Systems

et al. 2019

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The rejection of pyrrhotite and pyrite has become a long-standing problem in the copper ore industry. This paper describes the first successful depression and adsorption mechanism of a novel and non-hazardous reagent, polyglutamic acid (PGA), on pyrrhotite in the selective flotation of chalcopyrite with xanthate as the collector, making use of various laboratory-scale measurement techniques. The addition of PGA inhibited the flotation of pyrrhotite much more strongly than that of the chalcopyrite in a wide pH range. The prior addition of PGA achieved an improved selective flotation of chalcopyrite from pyrrhotite at pH 8, at which the grade and recovery of chalcopyrite in concentrate were over 80%. Surface measurement techniques including XPS spectral, IR spectral, zeta potential, and reagent adsorption analyses indicated that the PGA interacted differently with the two minerals, and had much greater affinity towards pyrrhotite than chalcopyrite. The presence of PGA blocked the electrochemical activity of the collector on the pyrrhotite surface and thus depressed its flotation, whereas the adsorption of the collector and its oxidation to dixanthogen were more effective on the chalcopyrite surface, indicating a weaker interaction of PGA with chalcopyrite. Our results suggest that the application of PGA could replace the toxic inorganic depressants in flotation technology, and could significantly reduce the environmental impacts of processing.

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The interaction of cyanide with pyrite, marcasite and pyrrhotite

Cited by 35 publications

References 15 publications

Application of EIS technique to investigate the adsorption of different types of depressants on pyrite

Application of EIS technique to investigate the adsorption of different types of depressants on pyrite

Application of Biogenic Thiosulfate Produced by Methylophaga sulfidovorans for Sustainable Gold Extraction

The Depression and Adsorption Mechanism of Polyglutamic Acid on Chalcopyrite and Pyrrhotite Flotation Systems

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