Evaluation of collector adsorption by electrochemical impedance spectroscopy

Ertekin, Zeliha; Pekmez, Kadi̇r; Ekmekçi, Zafir

doi:10.1016/j.minpro.2016.06.012

Cited by 6 publications

(9 citation statements)

References 26 publications

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“…For the clean pyrite electrode, the anodic peak A1 and the cathodic peak C1 were consequences of pyrite oxidation and reduction reactions, respectively. The assignment of each redox reaction has been investigated extensively 17, 18 and is beyond the discussion scope of the present paper. When pyrite was activated by CuSO 4 , an additional peak A3 appeared on the anodic sweep and peak C3 on the cathodic sweep.…”

Section: Resultsmentioning

confidence: 99%

“…Study of the frequency‐dependent periodic response of surfactants' adsorption layers to AC perturbations of potential facilitates precise knowledge of the bulk and the interfacial regions, enabling the physicochemical structure in these regions to be distinguished. There are several reports on EIS measurement of minerals interacting with flotation surfactants; however, a convincing physical model has not yet been established. In Venter's study, the Randle's equivalent electrical circuit (EEC) used for EIS modelling was too simple to simulate a structure with collector adsorption layer in addition to an electrical double layer; other studies failed to obtain an independent time‐constant for a xanthate adsorption layer on the spectra although two time‐constant EECs were used for modelling.…”

Section: Introductionmentioning

confidence: 99%

“…There are several reports on EIS measurement of minerals interacting with flotation surfactants; however, a convincing physical model has not yet been established. In Venter's study, the Randle's equivalent electrical circuit (EEC) used for EIS modelling was too simple to simulate a structure with collector adsorption layer in addition to an electrical double layer; other studies failed to obtain an independent time‐constant for a xanthate adsorption layer on the spectra although two time‐constant EECs were used for modelling. In Guo's previous EIS study of Cu activated pyrite, there also was a shortage of interpretation for the one time‐constant spectrum used.…”

Section: Introductionmentioning

confidence: 99%

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Establishment of electrochemical methods to examine the adsorption of flotation surfactants onto a mineral surface

Guo

Lin

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND Significant efforts have been devoted to examine the adsorption of flotation surfactants in both mechanistic studies and process implementations. However, quantitative electrochemical methods for flotation surfactant adsorption examination have not been well‐established, despite of their low‐cost, accurate, in‐situ nature. RESULTS In this paper, voltametric measurement was proven to quantitatively examine the adsorption of activating copper and lead ions onto a pyrite surface. The activation was achieved by abrading minerals in a heavy‐metal‐bearing solution and the measurements were performed by transferring the minerals to a solution free of those heavy metals. This provided a simple but realistic simulation of the mineral grinding process and simplified the adsorption quantification by excluding any other irrelevant electrochemical reactions near the surface. Reliable electrochemical impedance spectroscopy (EIS) upon adsorption with convincing physical models for interpreting the interfacial structures also were obtained in this paper. The additional pseudocapacitive behaviour of the copper sulfide surface layer led to an increased capacitance of the measured EIS. A resistive but ion‐permeable xanthate adsorption layer exhibited its own relaxation process. Voltammetry and impedance studies showed that cyanide competed with both copper and lead for their adsorption, whereas lead activation showed greater tolerance to cyanide than copper did. CONCLUSION Electrochemical methods have been established to examine the adsorption of copper, lead and xanthate onto pyrite surface, in relation to various flotation conditions, which exhibited significant implication to the flotation of pyritic gold ore using cyanide‐bearing water. © 2020 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Establishment of electrochemical methods to examine the adsorption of flotation surfactants onto a mineral surface

Guo

Lin

et al. 2020

J of Chemical Tech & Biotech

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“…The mineral content of Sample A and Sample B was identified by XRD measurement. The results of the analysis were determined by Rietveld analysis of XRD patterns (Ertekin et. al, 2016).…”

Section: Methodsmentioning

confidence: 99%

“…In a previous study, the authors used EIS as the prime electrochemical technique to investigate the adsorption mechanisms of different types of collectors on pyrite (Ertekin et. al, 2016).…”

Section: Introductionmentioning

confidence: 99%