The assessment of the possibility of using slag in producing ferronickel for purification of wastewaters

Хоботова, Э. Б.; Graivoronskaya, I. V.; Datsenko, Vita; Baumer, V. N.

doi:10.3103/s1063455x11040084

Cited by 2 publications

(3 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To some extent, this probably explains the significant variation in previous kinetic results where different ͑including quite low͒ concentrations were used. [9][10][11][12][13][14] We focus on the first peak ͑A2͒ and its shoulder ͑A1͒. First, while A2 was clearly detected at all experimental conditions of interest, the occurrence of A1 depended significantly on the experimental conditions, such as scan rate, pH, ionic strength, etc.…”

Section: Resultsmentioning

confidence: 99%

“…They also claimed that ammonia concentration did not influence the rate of surface reaction. Extensive work has been done by Khobotova et al, [10][11][12][13] who investigated products of the positive-going and chemical dissolution of copper in a Cu͑NH 3 ͒ 4 Cl 2 medium. They observed different corrosion products, including CuCl, Cu 2 O, Cu͑OH͒ 2 , and CuO.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Copper Dissolution in Ammonia Solutions: Identification of the Mechanism at Low Overpotentials

Strmčnik

Gaberšček

Pihlar

et al. 2009

J. Electrochem. Soc.

View full text Add to dashboard Cite

Corrosion of copper in ammonia solutions is significantly affected by a large number of parameters such as the concentration of ammonia, pH, temperature, concentration of Cu2+ , the presence/absence of dissolved oxygen, the chemical nature, and the concentration of the anion but also by selected corrosion products, in particular, Cu+ , various adsorbed intermediates, and finally passive films. In the present work we try to elucidate the corrosion of copper in a wide potential window [from −1.4 to 0 vs mercury/mercurous sulfate electrode (MSE)] and in a broad range of concentrations of various species (0.2–3.5 mol/L NH3 , 0–0.1 mol/L Cu2+ , pH 10–12.5). Then, we focus on the first peak occurring within −1.0 to −0.6 V vs MSE with the aim to explain the underlying mechanism. We show that the reaction order of the dissolution reaction with respect to ammonia is 2. We further show that using conventional electrochemical methods in combination with an optical method (scanning electron microscopy), a two-step (electrochemical-chemical) reaction yielding Cu2O is identified as the most likely passivation mechanism, consistent with previous assumptions by other authors. Finally, we confirm this mechanism by performing impedance analysis at various experimental conditions.

show abstract

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Copper Dissolution in Ammonia Solutions: Identification of the Mechanism at Low Overpotentials

Strmčnik

Gaberšček

Pihlar

et al. 2009

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…It was established in paper (Khobotova et al 2011) that the use of ferronickel production sludge as a sorbent involved the need and expediency of its chemical activation by acid or alkali. The sorption capacity of slag is determined by its high content of dioxide CaMgSi 2 O 6 in amorphous state (53%).…”

Section: The Use Of Production Wastes In Groundwater Treatmentmentioning

confidence: 99%

Filtration Materials for Groundwater

2016

View full text Add to dashboard Cite

The assessment of the possibility of using slag in producing ferronickel for purification of wastewaters

Cited by 2 publications

References 1 publication

Copper Dissolution in Ammonia Solutions: Identification of the Mechanism at Low Overpotentials

Copper Dissolution in Ammonia Solutions: Identification of the Mechanism at Low Overpotentials

Filtration Materials for Groundwater

Contact Info

Product

Resources

About