Abstract
The overview of existing models for iron oxides reducing and an analysis of their applicability to technogenic formations is presented. The thermodynamic analysis data of iron oxides reducing reactions through solid and gas phases and experiment results presenting features of technogenic iron oxide reducing under conditions of solid-phase diffusion (limited diffusion) and partially liquid-phase diffusion (easier diffusion) of iron oxide ions. It is shown that under conditions of iron oxide ions solid-phase diffusion the reduction processes rate is significantly affected by the briquettingpressure, which increases the contact area of reacting substances. The briquetting pressure does not affect the reduction processesrate under conditions of partially liquid-phase diffusionof iron oxide ions. An ion-diffusion catalytic mechanism is proposed to describe the observed effects of technogenic iron oxide reducing
Highlights
The thermodynamic analysis data of iron oxides reducing reactions through solid and gas phases and experiment results presenting features of technogenic iron oxide reducing under conditions of solid-phase diffusion and partially liquid-phase diffusion of iron oxide ions
It is shown that under conditions of iron oxide ions solid-phase diffusion the reduction processes rate is significantly affected by the briquettingpressure, which increases the contact area of reacting substances
Protsessy pri vosstanovlenii i izvlechenii metallov iz rud], Elektrometallurgiya [Electrometallurgy], 2020, no., pp. 14-
Summary
В кристаллической решетке вюстита всегда содержится избыток кислорода, поэтому более точно его состав соответствует нестехиометрической формуле Fe0,91O или FeO1,09. При недостатке в решетке вюстита катионов Fe2+ ее электронейтральность поддерживается за счет перехода части двухзарядных катионов Fe2+ в трехзарядные Fe3+, поэтому данное нестехиометрическое соединение можно рассматривать как твердый раствор замещения Fe2O3 в FeO [3]. Ионы кислорода образуют плотнейшую кубическую решетку, содержащую в одной элементарной ячейке 32 октаэдрических и 64 тетраэдрических пустот. Для описания механизма восстановления оксидов металлов углеродом предложено несколько моделей [4,5,6,7,8]. Если температуры восстановления и возгонки оксида близки, то взаимодействие оксида и восстановителя возможно за счет испарения оксида с последующей конденсацией (адсорбцией) его паров на поверхности углерода, где и происходит процесс восстановления: MeOт =MeО↑,
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