Results 71 to 80 of about 3,242 (195)

Towards sustainable processing of columbite group minerals: elucidating the relation between dielectric properties and physico-chemical transformations in the mineral phase [PDF]

, 2017
Current methodologies for the extraction of tantalum and niobium pose a serious threat to human beings and the environment due to the use of hydrofluoric acid (HF).
AR Batchelor, D Panias, D Slocombe, EA Brocchi, EG Polyakov, GJ Janz, H Näfe, J Gonzalez, K Melka, M Hartman, MH Rodriguez, MH Rodriguez, MJ Kabangu, MS Crowley, N Kanari, NT Mudzanapabwe, OS Ayanda, S Parirenyatwa, S Sanchez-Segado, S Sanchez-Segado, SW Kingman, T Monti, XM Chen, Z Zhu   +23 more
core   +3 more sources

Heterostructured Sn:SnO2 Nanodots for High‐Performance Li–S Batteries with Kinetics‐Enhanced Cathode and Dendrite‐Free Anode

Advanced Functional Materials, Volume 35, Issue 47, November 19, 2025.
Heterostructured Sn:SnO2 nanodots decorated on reduced graphene oxide can simultaneously enhance conversion kinetics and inhibit dendrite growth, enabling stable lithium–sulfur batteries. Abstract The practical application of lithium–sulfur batteries is limited by polysulfide shuttling and sluggish reaction kinetics at the cathode, as well as ...
Viet Phuong Nguyen, Duckjong Kim, Jiho Kang, Wonzee Jung, Suim Lim, Kanghoon Yim, Seung‐Mo Lee   +6 more
wiley   +1 more source

Electrolysis of metal oxides in MgCl2 based molten salts with an inert graphite anode [PDF]

, 2016
Eletrolysis of solid metal oxides has been demonstrated in MgCl2-NaCl-KCl melt at 700 oC taking the electrolysis of Ta2O5 as an example. Both the cathodic and anodic processes have been investigated using cyclic voltammetry, potentiostatic and constant ...
Chen, George Z., Chen, Hualin, Jin, Xianbo, Li, Wei, Wang, Zhiyong, Yuan, Yating   +5 more
core   +3 more sources

Carbothermal reduction of Titanium monoxide (TiO)

Journal of the Ceramic Society of Japan, 2008
The carbothermal reduction of TiO was investigated and compared with that of TiO2 using a thermodynamic approach and experiments. Cubic-TiO powder was synthesized using a high-energy mill to understand the reduction and carburization process. During the reduction and carburization process, TiO is found to be changed into TiC and Ti2O3 simultaneously at
Hanjung KWON, Shinhoo KANG
openaire   +2 more sources

The Reduction of Group 6–8 Transition Metal Oxides with Hydrogen—From Ore Smelting to Reaction Pathways#

European Journal of Inorganic Chemistry, Volume 28, Issue 30, October 22, 2025.
As the reduction of transition metal oxides by coal poses a significant climate risk, the use of alternative reducing agents such as hydrogen is becoming increasingly important. This review summarizes the current knowledge of the reduction pathways of transition metal oxides from groups 6 to 8.
Michael Häger, Simon Keilholz, Holger Kohlmann   +2 more
wiley   +1 more source

Solid State Carbothermal Reduction of Alumina

, 2016
The Hall-Heroult process, the only commercial technology for aluminum production requires high energy and is a major origin of perfluorocarbons and green house gases. A promising alternative process, carbothermal reduction of alumina to metallic aluminum has advantages of lower capital cost, less energy consumption, and lower emission of green house ...
Liu, D, Zhang, G, Li, J, Ostrovski, O
openaire   +2 more sources

Shielding Si Armed with CoSi2 Nanoplates and Dual‐Carbon Shells: 3D Porous Microspheres as High‐Performance Anodes for Li‐Ion Batteries

Advanced Science, Volume 12, Issue 40, October 27, 2025.
The lithium‐ion battery anode is designed utilizing 3D porous microspheres comprising Si armed with CoSi2 multi‐cores encapsulated within dual protective shells of metallic‐Co embedded nitrogen‐doped graphitic carbon (NGC) and polydopamine‐derived carbon (PDA‐C).
Jae Seob Lee, Hyun Seon Ahn, Jung Yeon Kim, Rakesh Saroha, Beom Su Jo, Ji Hun Baek, Yun Chan Kang, Gi Dae Park, Dae Soo Jung, Dong‐Won Kang, Chungyeon Cho, Jung Sang Cho   +11 more
wiley   +1 more source

Carbides and Nitrides of Zirconium and Hafnium. [PDF]

, 2019
Among transition metal carbides and nitrides, zirconium, and hafnium compounds are the most stable and have the highest melting temperatures. Here we review published data on phases and phase equilibria in Hf-Zr-C-N-O system, from experiment and ab ...
Hong, Qi-Jun, Navrotsky, Alexandra, Ushakov, Sergey V, van de Walle, Axel   +3 more
core   +1 more source

Carbothermic Reduction of Alumina: A Thermodynamic Analysis

Canadian Metallurgical Quarterly, 1965
Abstractusing new thermodynamic data for Al4C3, stability relationships in the Al-C-O system have been determined. A Pourbaix-Ellingham diagram has been constructed and is used to evaluate the equilibrium carbothermic-reduction process. The analysis indicates that liquid Al can never be obtained below 2100° K and that appreciable amounts of Al2O(g) are
openaire   +2 more sources

Stepwise carbothermal reduction of bauxite ores

International Journal of Mineral Processing, 2013
Abstract The commercial technologies for aluminium production include production of alumina from bauxite and smelting of alumina to produce aluminium. The current technology is energy intensive, and a major source of greenhouse gas emissions and harmful fluoride emissions.
Yeh, Chun-Hung, Zhang, Guangqing
openaire   +3 more sources