Open AccessThermodynamic modeling of nickel and iron reduction from B<sub>2</sub>O<sub>3</sub> – CaO – Fe<sub>2</sub>O<sub>3</sub> – NiO melt by СО – СО<sub>2</sub> and Н<sub>2</sub> – Н<sub>2</sub>О mixtures
Author(s) -
А. С. Вусихис,
Л. И. Леонтьев,
Е. Н. Селиванов
Publication year - 2021
Publication title -
izvestiâ vysših učebnyh zavedenij. černaâ metallurgiâ
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.3
H-Index - 7
eISSN - 2410-2091
pISSN - 0368-0797
DOI - 10.17073/0368-0797-2021-5-353-359
Subject(s) - nickel , non blocking i/o , metal , oxide , iron oxide , chemistry , analytical chemistry (journal) , phase (matter) , nickel oxide , atmospheric temperature range , thermodynamics , materials science , metallurgy , catalysis , biochemistry , physics , organic chemistry , chromatography
To predict the conditions for metals reduction from an oxide melt by gas in bubbling processes, a thermodynamic modeling technique has been developed that provides an approximation to real systems. The main difference between the accepted method and the well-known one is in conducting successive calculation cycles with withdrawal of the generated gases and the metal phase from the working medium. This paper presents the results of thermodynamic modeling of nickel and iron reduction processes from B 2 O 3 – CaO– Fe 2 O 3 – NiO melts by mixtures of CO– CO 2 and H 2 – H 2 O containing 0 – 60 % CO 2 (H 2 O) in the temperature range of 1273 – 1673 K. The calculations evaluated the content of nickel and iron oxides in the melt and the degree of their reduction. It is shown that, regardless of the gas composition, this process proceeds in several stages. At the first stage, Fe 2 O 3 is reduced to Fe 3 O 4 and FeO. С Fe2O3 values decrease to almost zero, while С Fe3O4 and C FeO increase simultaneously. By the end of the phase, С FeO reaches its maximum value. At the second stage, the Fe 3 O 4 → FeO transition occurs, when С Fe3O4 values reach maximum, nickel and iron begin to reduce to metal. At reduction by CO– CO 2 mixture, an increase in temperature reduces the metallization of both nickel and iron. Similarly, an increase in the CO 2 content of the introduced gas affects. During interaction of the oxide melt with a gas containing 60 % CO 2 , the third stage is absent. At reduction by H 2 – H 2 O mixture, an increase in temperature reduces the metallization of nickel, but increases metallization of iron. With increasing water vapor content in the introduced gas, the degree of metallization of both nickel and iron decreases. The obtained data are useful for creating technologies for selective reduction of metals and formation of ferronickel of the required composition.