Open AccessReduction mechanism of titanomagnetite concentrate by carbon monoxide
Author(s) -
Xuefeng She,
Hongqi Sun,
Xiangjuan Dong,
Qingguo Xue,
Jingsong Wang
Publication year - 2013
Publication title -
journal of mining and metallurgy. section b, metallurgy/journal of mining and metallurgy. section b, metallurgy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.42
H-Index - 20
eISSN - 2217-7175
pISSN - 1450-5339
DOI - 10.2298/jmmb121001020s
Subject(s) - carbon monoxide , degree (music) , monoxide , impurity , diffusion , atmospheric temperature range , carbon fibers , analytical chemistry (journal) , chemical reaction , materials science , chemistry , redox , inorganic chemistry , mineralogy , catalysis , thermodynamics , organic chemistry , physics , composite number , acoustics , composite material
Titanomagnetite concentrate was reduced by CO-Ar gas mixtures in a laboratory fixed bed reactor in the temperature range from 1123 to 1323 K. The influences of reductive conditions on the reduction rate and metallization degree including reduction temperature, reduction time and carbon monoxide content were studied. And the characteristics of reduced samples were analyzed by XRD, BES and EDS. Results shown that both the reduction and metallization degree increased with the increasing of temperature and monoxide content. The low reduction degree was owing to the low iron oxides content and high impurities content such as magnesium oxide in titanomagnetite concentrate. Above 1123 K, the reduction is controlled by interfacial chemical reaction at early stage of the reaction and then turns to the internal diffusion controlling with reaction processing. The reduction path at temperatures above 1123 K is suggested as follow: Fe3-xTixO4 → (x+y-1)FeO + Fe4-2x-yTixO4-y → (x+y-1)Fe + Fe4-2x-yTixO4-y → (3-x)Fe + xTiO2 (0