Gheorgy Vissokov, Marinela Panayotova
Nano-dispersed (ND) powder with particles size of 100-500 nm is obtained by plasma-thermal destruction of zircon. ND ZrO 2 with purity of 95-96 % is received by further leaching with NaOH. Nascent chemical elements, obtained by complex compounds destruction (manganese oxide concentrates, as an example) possess high chemical affinity towards oxygen, which causes reverse oxidative reactions to proceed instantly and leads to considerable difficulties in elements fixing in elemental state. The high chemical activity of ND metal powders, expressed as pyrophoreness, is overcome partially by suitable passivation. The disruptive oxidation of low-valence oxides to (for example, MnO to manganese and oxygen) represents the limiting stage of the entire thermal decomposition of oxygen-containing substances. ND Al 2O3 is obtained by condensation of corundum (α-Al2O3) with granularity less than 50 μm. Depending on the process parameters its specific surface is in the range of 30-50 m2/g. Meta-stable non-equilibrium phases (γ- and δ-Al2O3, as an example) are fixed at quenching rate dT/dτ=105-106 K/s. The plasma-thermal destruction and/or re-condensation of complex compounds (ores, minerals, oxygen-containing salts, etc.) represents an effective method for their decomposition to lower compounds (oxides or even free elements) in ND state.
@article{87ba0395-c856-4611-9cec-ee57ac70f280,
title={PLASMA-CHEMICAL PROCESSING OF MINERALS TO NANO-DISPERSED POWDERS},
author={Gheorgy Vissokov and Marinela Panayotova},
year={2005},
language={en}
}TY - JOUR TI - PLASMA-CHEMICAL PROCESSING OF MINERALS TO NANO-DISPERSED POWDERS AU - Gheorgy Vissokov AU - Marinela Panayotova PY - 2005 LA - en ER -
David Pollard, Geoff Dunlop
The MetPlant 2008 conference focused on advancements in metallurgical processing of ores, emphasizing plant design, operation strategies, and innovati
Blair Burwell
The exhaustion of current vanadium sources and the emergence of new applications are driving the need for innovative methods of extraction. The aim of
Alain Vignes
This book provides a comprehensive overview of the various processing operations and routes in extractive metallurgy. The objective is to present a de
Alain Vignes
This book provides a comprehensive overview of the fundamental principles of extractive metallurgy, with a specific focus on basic thermodynamics and
Lifeng Zhang, Antoine Allanore
This volume compiles peer-reviewed papers from the “Materials Processing Fundamentals” symposium held at the TMS 2013 Annual Meeting & Exhibition in S
The Australasian Institute of Mining and Metallurgy
This conference, held in Perth, Western Australia, focuses on the latest advancements in metallurgical processing plant design and operational strateg