Mechanism of Ion-Diffusion Solid-Phase Reduction of Iron Oxides of Technogenic Origin in the Presence of the Liquid Phase and without it
| Autor: | Larisa Vedmid, D. K. Egiazaryan, M. A. Mikheenkov, I. V. Nekrasov, Oleg Sheshukov |
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| Rok vydání: | 2020 |
| Předmět: |
lcsh:TN1-997
Materials science iron oxides Diffusion 0211 other engineering and technologies Iron oxide 02 engineering and technology metallization Ion thermodynamics recovery chemistry.chemical_compound Differential scanning calorimetry Flux (metallurgy) Phase (matter) THERMODYNAMICS General Materials Science Sample preparation IRON OXIDES lcsh:Mining engineering. Metallurgy 021102 mining & metallurgy TECHNOGENIC ORIGIN 020502 materials diffusion Metals and Alloys RECOVERY METALLIZATION DIFFUSION technogenic origin 0205 materials engineering Chemical engineering chemistry Reagent |
| Zdroj: | Metals Volume 10 Issue 12 Metals, Vol 10, Iss 1564, p 1564 (2020) |
| ISSN: | 2075-4701 |
| DOI: | 10.3390/met10121564 |
| Popis: | The processes of iron oxides&rsquo reduction have a complex physicochemical mechanism, with the participation of solid, liquid, and gaseous substances. The article discusses the existing models for the reduction of iron oxides and provides data on the thermodynamic possibility of carrying out the reactions of their reduction through the solid and gas phases. Experimental data on the reduction of iron from industrial scale, obtained by the DSC (differential scanning calorimetry) method, show the kinetic dependence of the rate and completeness of recovery on external factors: pressing pressure during sample preparation and the reagents&rsquo composition. The pressing pressure, under conditions of iron ions&rsquo solid-phase diffusion, has the significant effect by increasing the reagents&rsquo contact area. Under conditions of iron ions&rsquo comprehensive diffusion, the pressing pressure does not affect the reduction processes rate. The introduction of 10 mass.% flux into the raw mixture composition leads to a partially liquid-phase diffusion of iron ions and weakens the effect of the pressing pressure in this process. An ion diffusion-catalytic mechanism is proposed to describe the observed effects during the reduction of iron oxide of technogenic origin. |
| Databáze: | OpenAIRE |
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