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Role of Selected Cations and Gas Speciation on the Reduction of Fayalite at 1300°C
Author(s) -
Ulmer Gene C.,
Elliott William Crawford,
Buntin Thomas,
Erickson Edwin S.,
Friel John J.
Publication year - 1992
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1992.tb04213.x
Subject(s) - fayalite , hydrogen , chemistry , inorganic chemistry , mineralogy , organic chemistry , olivine
Pure fayalite liquid was reduced at 1300°C in variable C/H ratio gas mixtures, all with constant f O2 both with and without various cation additives that included Cr 2 O 3 , MnO, CaO, TiO 2 , Al 2 O 3 , Na 2 O, and K 2 O. Similar studies were also performed on Carol Lake iron ore pellets without these cation additives. The role of cation additives in reduction with CO‐rich gases is minimally important. In hydrogen‐rich reduction studies, the reduction per hour was increased 50% by a 2.5 wt% addition of CaO, increased by about 75% by a 2.5 wt% addition of Cr 2 O 3 , and increased by about 50% for a 2.5 wt% addition of MnO as compared to the reduction rate of pure fayalite liquid. Much more dramatic than any cation additive effect is the role of the hydrogen content of the gas mixture. At 1300°C and a fixed –log f O2 = 13, the reduction per hour of pure fayalite liquid triples with the replacement of the CO by hydrogen even with just the first 10 vol% of hydrogen. Theoretical discussions of the role of cation additives and gas speciation on fayalite melt structure are presented.