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

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.

[1]  T. Ponomarenko,et al.  Assessment of Energy Sustainability Issues in the Andean Community: Additional Indicators and Their Interpretation , 2022, Energies.

[2]  V. Sukhomlinov,et al.  Accounting for Interelement Interferences in Atomic Emission Spectroscopy: A Nonlinear Theory , 2021, Applied Sciences.

[3]  D. A. Konchus,et al.  A Surface Structure Formation of Stainless Steel Using a Laser , 2021 .

[4]  V. E. Quiroz Cabascango,et al.  Combustion optimization in gas burners of reverberatory furnaces during the melting of nickel alloys , 2021 .

[5]  V. Golubev,et al.  Raw material composition at Rusal Achinsk and its impact on the production indicators , 2020 .

[6]  V. Yu. Bazhin,et al.  Mining Institute’s metallurgists: a tradition serving the Country, science and production industry , 2020 .

[7]  V. Bazhin,et al.  Nickel oxide reduction in CO/CO2 gas mixtures in reverberatory furnaces , 2020, Journal of Physics: Conference Series.

[8]  K. Shakhnazarov Property Anomalies of Unalloyed Pre-Eutectoid Steel Melts at ~0.5% C as a Consequence of the Intermediate Fe42C Phase , 2020, Steel in Translation.

[9]  А. Г. Сырков,et al.  Влияние температуры на твердотельный гидридный синтез металлов по данным термодинамического моделирования , 2019 .

[10]  A. Ivanov,et al.  COMPARATIVE ANALYSIS OF ZINC AND TIN OXIDATION WITH ACIDS AT ROOM TEMPERATURES , 2019, Journal of Mining Institute.

[11]  D. Fedoseev,et al.  Industrial synthesis of finely-dispersed aluminum hydroxide in processing of aluminic raw materials , 2018, Tsvetnye Metally.

[12]  B. Mishra,et al.  Oxide powders production from iron chloride , 2018, CIS Iron and Steel Review.

[13]  V. Kogan RATIONAL USE OF SCIENCE OF CHEMISTRY AS A FACTOR FOR ENVIRONMENTAL SAFETY AND ENSURING ECOSYSTEM PURITY , 2017 .

[14]  A. Rotaru Discriminating within the kinetic models for heterogeneous processes of materials by employing a combined procedure under TKS-SP 2.0 software , 2016, Journal of Thermal Analysis and Calorimetry.

[15]  Doris Vollmer,et al.  How Water Advances on Superhydrophobic Surfaces. , 2016, Physical review letters.

[16]  S. Kitamura,et al.  A Kinetic Model to Simulate the Reaction Between Slag and Matte for the Production of Ferromanganese Alloy from Steelmaking Slag , 2016, Journal of Sustainable Metallurgy.

[17]  Richard Baltensperger,et al.  Prediction of thermal stability of materials by modified kinetic and model selection approaches based on limited amount of experimental points , 2014 .

[18]  L. B. Boinovich Superhydrophobic coatings as a new class of polyfunctional materials , 2013, Herald of the Russian Academy of Sciences.

[19]  P. Masset,et al.  High Temperature Diffusion Processes at the Metal/Slag Interface , 2012 .

[20]  Tatyana Alexandrova,et al.  Justification of evaluation criteria of gold beneficiation ability by gravitational methods , 2020, Journal of Applied Engineering Science.

[21]  A. Syrkov,et al.  Development of research of Low-dimension Metal-containing systems from p. p. Weymarn to our days , 2018 .

[22]  R. Ralys,et al.  Deriving properties of low-volatile substances from isothermal evaporation curves , 2015 .