The Solubility of Some Transition Metal Oxides in Cryolite-Alumina Melts: Part III. Solubility of CuO and Cu2O

Lorentsen, Odd-Arne; Jentoftsen, Trond E.; Dewing, E. W.; Thonstad, J.

doi:10.1007/s11663-007-9043-4

Cited by 14 publications

(4 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Further, Cu was continuously oxidized. The corrosion resistance of CuO and Cu 2 O is worse than that of NiFe 2 O 4 and NiO [ 24 , 25 ]. CuO and Cu 2 O would preferentially be dissolved corrosion and then the electrolyte penetration channels are formed.…”

Section: Resultsmentioning

confidence: 99%

Electrolytic Corrosion Behavior of 20 Cu-20 Ni-54 NiFe2O4-6 NiO Cermet with Interpenetrating Structure at 880 °C and 960 °C

Yuqiang

Xiong

et al. 2022

Materials

View full text Add to dashboard Cite

Here, 20 Cu-20 Ni-54 NiFe2O4-6 NiO (wt%) cermets were prepared via the powder metallurgy process, and the electrolytic corrosion behavior of the cermets at 880 °C and 960 °C was studied through the microstructure analysis by SEM and EDS. Results show that the ceramic phase is seriously affected by chemical corrosion at 880 °C electrolysis, and it is difficult to form a dense ceramic surface layer. A dense ceramic surface layer is formed on the bottom of the anode electrolyzed at 960 °C, and the dense layer thickens with the extension of the electrolysis time. The formation of the dense surface layer is mainly caused by the oxidation of Ni. The oxidation rate of the metallic phase and the corrosion rate of the ceramic phase have an important effect on the formation of the dense layer. In the corrosion process of NiFe2O4 phase, preferential corrosion of Fe element occurs first, and then NiO phase is precipitated from NiFe2O4 phase. After the NiO is dissolved and corroded, the NiFe2O4 grains collapse and the ceramic phase peels off from the anode.

show abstract

Section: Resultsmentioning

confidence: 99%

Electrolytic Corrosion Behavior of 20 Cu-20 Ni-54 NiFe2O4-6 NiO Cermet with Interpenetrating Structure at 880 °C and 960 °C

Yuqiang

Xiong

et al. 2022

Materials

View full text Add to dashboard Cite

show abstract

“…Dissolution of NiO in cryolite also occurs through reactions with the formation of nickel fluorides and aluminum oxide [ 30 ]. Dissolution of oxides CuO, Cu 2 O, and TiO 2 occurs through the interaction with liquid cryolite with the formation of fluorides CuF and CuF 2 and oxyfluoride NaTiOF 3 [ 31 , 32 ].…”

Section: Research Resultsmentioning

confidence: 99%

Metallurgy and Mechanism of Underwater Wet Cutting Using Oxidizing and Exothermic Flux-Cored Wires

Parshin

Levchenko²,

Wang

2021

Materials

View full text Add to dashboard Cite

This paper considers the metallurgical processes of dissociation, ionization, oxidation, deoxidation, and dissolution of oxides during underwater wet cutting. A multiphase mechanism of underwater wet cutting consisting of working and idle cycles of the electrical process in a pulsating vapor gas bubble is proposed. A model of arc penetration into metal due to metal oxidation and stabilization of the arc by the inner walls of a narrow kerf is proposed. For underwater cutting of 10 KhSND, 304L steel, CuAl5, and AlMg4.5Mn0.7 alloy, we provide a principle of modeling the phase composition of the gas mixture based on high oxygen concentration, improving ionization, enthalpy, heat capacity, and thermal conductivity of plasma through the use of a mixture of KNO3, FeCO3, and aluminum. The method of improving the thermophysical properties and ionization of plasma due to the exothermic effect when introducing Fe3O4, MoO2, WO2 oxides and Al, Mg, Ti deoxidizers is proposed. Although a negative effect of refractory slag was revealed, it could be removed by using the method of reducing surface tension through the ionic dissolution of refractory oxides in Na3AlF6 cryolite. In underwater cutting of 10 KhSND and 304L, the steel welding current was 344–402 A with a voltage of 36–39 V; in cutting of CuAl5 and AlMg4.5Mn0.7 alloy, the welding current was 360–406; 240 A, with a voltage of 35–37; 38 V, respectively, with the optimal composition of flux-cored wire: 50–60% FeCO3 and KNO3, 20–30% aluminum, 20% Na3AlF6. Application of flux-cored wires of the KNO3-FeCO3-Na3AlF6-Al system allowed stable cutting of 10KhSND, AISI 304L steels, and CuAl5 bronze with kerf width up to 2.5–4.7 mm.

show abstract

“…Moreover, CuO and Cu 2 O solubility is low in alumina-saturated melts, and the solubility decreases with an increase in alumina concentration. 23 In a saturated sodium cryolite melt (CR = 3), the solubility of CuO can be estimated by log(wt% Cu) = −9664/T + 7.0128 and the solubility of Cu 2 O by log(wt% Cu) = −8677/T + 6.173.…”

Section: Inert Anode Materialsmentioning

confidence: 99%

Review—Primary Production of Aluminium with Oxygen Evolving Anodes

Padamata

Singh

Haarberg

et al. 2023

J. Electrochem. Soc.

View full text Add to dashboard Cite

Due to environmental and economic concerns, carbon-free aluminium production has been an ultimate goal for aluminium industries. For the past few decades, a considerable amount of research has been conducted to find an inert anode material that could replace the consumable carbon anodes for aluminium electrolysis. Anodic materials such as metals, ceramics, and cermets have been studied extensively. All these anode materials have their advantages and disadvantages. However, metal alloys have proven effective because of their resistance to high-temperature corrosion and their ability to produce a protective oxide layer. For a successful adaptation of metallic anodes into the aluminium electrolysis cell, an electrolyte with a low operating temperature and high alumina solubility with good electrical conductivity is required. A wettable cathode with a shorter anode-to-cathode distance is preferred to compete with the Hall-Héroult process in terms of energy requirements. This review discusses the research progress on inert anodes, wettable cathodes, and electrolytes.

show abstract

The Solubility of Some Transition Metal Oxides in Cryolite-Alumina Melts: Part III. Solubility of CuO and Cu2O

Cited by 14 publications

References 13 publications

Electrolytic Corrosion Behavior of 20 Cu-20 Ni-54 NiFe2O4-6 NiO Cermet with Interpenetrating Structure at 880 °C and 960 °C

Electrolytic Corrosion Behavior of 20 Cu-20 Ni-54 NiFe2O4-6 NiO Cermet with Interpenetrating Structure at 880 °C and 960 °C

Metallurgy and Mechanism of Underwater Wet Cutting Using Oxidizing and Exothermic Flux-Cored Wires

Review—Primary Production of Aluminium with Oxygen Evolving Anodes

Contact Info

Product

Resources

About