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Journal of Mining Institute, volume 256, pages 651-662

Features of obtaining metallurgical products in the solid-state hydride synthesis conditions

Publication typeJournal Article
Publication date2022-11-10
Quartile SCImago
Q1
Quartile WOS
Impact factor1.5
ISSN24113336, 25419404
Geotechnical Engineering and Engineering Geology
Geology
Economic Geology
Energy (miscellaneous)
Abstract

A scientific substantiation of solid-phase feedstock choice and preparation has been carried out, and the thermodynamic and kinetic aspects of solid-state hydride synthesis (SHS) of metal products have been analyzed using the nickel dichloride reduction as an example. The preliminary dehydration modes and methods for controlling the complete removal of crystalline water from chloride raw materials and Olenegorsk superconcentrate, which is natural oxide raw material, are described. Conditions, including initial solid chloride particle sizes, are established under which diffusion complications of reduction to metal in methyldichlorosilane vapor are minimized. Thermodynamic estimates of nickel chlorides and oxides reduction possibility, iron and copper with ammonia and methane at temperatures of 400-1000 K in equilibrium conditions have been carried out. It has been shown that the stoichiometric coefficients of the nickel dichloride in ammonia overall reduction reaction calculated by thermodynamic modeling are in agreement with experimental data. In contrast to the copper dichloride reduction, for nickel dichloride the formation of metal monochloride at the intermediate stage is uncharacteristic, which is associated with a higher thermal stability of nickel dichloride. The main kinetic regularities of the reduction of nickel, copper, and iron to metal under SHS conditions in ammonia, monosilane, and methane, as well as the nickel dichloride with methyldichlorosilane vapor and methane successive reduction, are considered. Approximation of experimental data by topochemical equations in a linear form showed that for reduction degrees a up to 0.7-0.8, these data are satisfactorily described by the Roginsky – Schultz equation. For a > 0,8 the “shrinking sphere” model works better, which confirms the localization of the solid-state reduction reaction at the interface, moves deep into the crystal with the formation of a of interlocked metal germs. The importance and prospects of the results obtained for the theory development of metallurgical processes, deep complex processing of natural iron oxide raw materials, metal products and new generation materials production, including superhydrophobic ones, are discussed. The relevance of the study from the point of view of applying the method of physical and chemical analysis to the study of complex heterogeneous metallurgical processes is noted.

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Syrkov A. G., Yachmenova L. Features of obtaining metallurgical products in the solid-state hydride synthesis conditions // Journal of Mining Institute. 2022. Vol. 256. pp. 651-662.
GOST all authors (up to 50) Copy
Syrkov A. G., Yachmenova L. Features of obtaining metallurgical products in the solid-state hydride synthesis conditions // Journal of Mining Institute. 2022. Vol. 256. pp. 651-662.
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RIS Copy
TY - JOUR
DO - 10.31897/PMI.2022.25
UR - https://doi.org/10.31897%2FPMI.2022.25
TI - Features of obtaining metallurgical products in the solid-state hydride synthesis conditions
T2 - Journal of Mining Institute
AU - Syrkov, Andrey G.
AU - Yachmenova, Lyudmila
PY - 2022
DA - 2022/11/10 00:00:00
PB - Saint Petersburg Mining University
SP - 651-662
VL - 256
SN - 2411-3336
SN - 2541-9404
ER -
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BibTex Copy
@article{2022_Syrkov,
author = {Andrey G. Syrkov and Lyudmila Yachmenova},
title = {Features of obtaining metallurgical products in the solid-state hydride synthesis conditions},
journal = {Journal of Mining Institute},
year = {2022},
volume = {256},
publisher = {Saint Petersburg Mining University},
month = {nov},
url = {https://doi.org/10.31897%2FPMI.2022.25},
pages = {651--662},
doi = {10.31897/PMI.2022.25}
}
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