Consistent thermodynamic modeling of H2O–HCl–KOH–KCl between 200 K and 1,000 K

Niazi, Sepideh; Nygård, Heidi S.; Reis, Bruno; Baben, Moritz to

doi:10.1016/j.ces.2022.118209

Cited by 2 publications

(1 citation statement)

References 31 publications

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“…This phenomenon may be attributed to the salting-out effect during leaching in the presence of Ni 2+ , Ti 4+ , SO4 2− , and HSO4 − ions as enhanced ionic potential due to increase of acid concentration [24]. After passing its maximum solubility (calculated concentration for crystallization is 68%) of 38.5% in HCl solution, the insoluble gaseous form is released either as HCl gas or Cl2 gas [25]- [27]. Nevertheless, small crystalline structures are observed with H3PO4, while a compact layer is present after HNO3 leaching.…”

Section: Leaching Of Niti Alloy Using Different Mineral Acidsmentioning

confidence: 99%

Effect of various mineral acids during the hydrothermal leaching process of NiTi alloy

Özgün,

BATIBAY,

Ünal

et al. 2023

Pamukkale J Eng Sci

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Nickel and titanium-based alloys are commonly used for engineering or medical applications. NiTi alloys are recycled as additive materials at the end of their lifetime. Separate recovery of metals present in NiTi alloy is possible via hydrometallurgical methods; however, NiTi alloys are highly resistant to corrosion. Various mineral acids (H2SO4, HCl, HNO3, H3PO4) have been investigated, and the effect of H2O2 in the leaching medium has also been explored. Different leaching yields have been observed, and correlations between them according to acid treatment conditions have been established. SEM, XRF, and EDS techniques characterized alloys' microstructure and chemical properties. Among mineral acids, H2SO4 and HCl illustrated the highest extraction efficiencies. However, the addition of hydrogen peroxide decreased this efficiency severely. The kinetics of dissolution was obtained through decreased leaching efficiency with the addition of hydrogen peroxide.Nikel ve titanyum bazlı alaşımlar genellikle mühendislik veya tıbbi uygulamalar için kullanılır. NiTi alaşımları kullanım ömürlerinin sonunda katkı malzemesi olarak geri dönüştürülür. NiTi alaşımında bulunan metallerin hidrometalurjik yöntemlerle ayrı olarak geri kazanılması mümkündür; ancak NiTi alaşımları korozyona karşı oldukça dirençlidir. Çeşitli mineral asitler (H2SO4, HCl, HNO3, H3PO4) incelenmiş ve H2O2'nin liç ortamındaki etkisi de araştırılmıştır. Farklı liç verimleri gözlemlenmiş ve asit işleme koşullarına göre bunlar arasında korelasyonlar kurulmuştur. SEM, XRF ve EDS teknikleri alaşımların mikroyapısını ve kimyasal özelliklerini karakterize etmiştir. Mineral asitler arasında H2SO4 ve HCl en yüksek ekstraksiyon verimliliğini göstermiştir. Ancak, hidrojen peroksit ilavesi bu verimi ciddi şekilde düşürmüştür. Çözünme kinetiği, hidrojen peroksit ilavesiyle liç veriminin azalmasıyla elde edilmiştir.

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Section: Leaching Of Niti Alloy Using Different Mineral Acidsmentioning

confidence: 99%

Effect of various mineral acids during the hydrothermal leaching process of NiTi alloy

Özgün,

BATIBAY,

Ünal

et al. 2023

Pamukkale J Eng Sci

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Risk assessment for Na-Zn liquid metal batteries

Weber,

Duczek,

Monrrabal

et al. 2024

Open Res Europe

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Background Na-Zn liquid metal batteries, which operate at 600 °C, have recently been proposed as inexpensive stationary energy storage devices. As with any other electrochemical cell, their fabrication and operation involves certain risks, which need to be well understood in order to be minimised. Methods A risk assessment according to ISO 12100 is performed at the cell level for operating Na-Zn cells in the laboratory environment. Hazard identification and risk evaluation are systematically addressed, including a thorough literature review, theoretical calculations and selected experiments. Results Cell overpressure is found to be one of the main risks – and might be caused either by mistakes in battery production (humidity) or operation (over-charge/discharge). In terms of cell housing, the weakest component is clearly the feedthrough. Its failure might lead to the release of hazardous aerosols to the environment. In this context, the candidate electrolyte components LiCl and BaCl2 are especially dangerous, and should therefore be reduced or avoided if possible. Conclusions Overall, Na-Zn cells are expected to reach a very high safety level, similar to state-of-the-art ZEBRA technology, as they are not prone to thermal runaway. However, considering the still low TRL level and open questions concerning the durability of certain parts of their housing, the batteries should preferably be operated under a fume hood.

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Consistent thermodynamic modeling of H2O–HCl–KOH–KCl between 200 K and 1,000 K

Cited by 2 publications

References 31 publications

Effect of various mineral acids during the hydrothermal leaching process of NiTi alloy

Effect of various mineral acids during the hydrothermal leaching process of NiTi alloy

Risk assessment for Na-Zn liquid metal batteries

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