Open AccessCALCULATION OF THE TEMPERATURES OF THE CHEMICAL REACTIONS OF THE IRON STEPPED RECOVERY FROM HEMATITE WITH CO GAS AND GASIFICATION OF SOLID CARBON ACCORDING EXISTING FORMULAS AND BY STANDARD VALUES OF ENTHALPY AND ENTROPY OF SUBSTANCES
Author(s) -
S. Panteikov
Publication year - 2021
Publication title -
zbìrnik naukovih pracʹ dnìprodzeržinsʹkogo deržavnogo tehnìčnogo unìversitetu. tehnìčnì nauki/zbìrnik naukovih pracʹ dnìprovsʹkogo deržavnogo tehnìčnogo unìversitetu. tehnìčnì nauki
Language(s) - English
Resource type - Journals
eISSN - 2617-8389
pISSN - 2519-2884
DOI - 10.31319/2519-2884.39.2021.2
Subject(s) - hematite , wüstite , carbon fibers , enthalpy , chemical reaction , gibbs free energy , iron oxide , chemistry , oxide , thermodynamics , direct reduced iron , metal , materials science , mineralogy , organic chemistry , physics , composite number , composite material
The article presents the results of a thermodynamic assessment of the possibility of chemical reactions of the stepped recovery of iron from hematite with a recovering gas CO, as well as the Bell-Boudoir chemical reaction. It has been established that for each of the indicated chemical reactions there is a certain temperature (called by the author as "boundary temperature"), up to or above which CO gas cannot be a recovering agent for lower iron oxide from higher or the metallic iron itself from wustite, as well as gasification of solid carbon; while the recovery of Fe3O4 from Fe2O3 is theoretically possible at any temperatures above 0 ° C, the recovery of FeO from Fe3O4 and the gasification of solid carbon are theoretically possible above certain temperatures (i.e. at elevated and high temperatures), and the recovery of iron from FeO is below a certain temperature (i.e. at low temperatures).
The numerical values of the boundary temperatures for the reactions of iron recovery and its lower oxides, as well as the reaction of gasification of solid carbon are given; graphical dependences of the Gibbs free energy of the indicated chemical reactions on temperature are made according to the equations available in metallurgical literary sources, and according to the expressions derived in the article by the author.