Influence of CaO Source on the Formation Behavior of Calcium Ferrite in Solid State

Calcium hydroxide and Calcium carbonate were used as CaO source to investigate the formation behavior of calcium ferrite in solid state below 1200°C. The density change of CaO–Fe2O3 samples with temperature were in-situ and off-line determined, with linear shrinkage rate test for mixed powders at a...

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Published in:ISIJ International 2013/09/15, Vol.53(9), pp.1571-1579
Main Authors: Yin, Jiaqing, Lv, Xuewei, Xiang, Shenglin, Bai, Chenguang, Yu, Bin
Format: Article
Language:English
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calcium ferrite
CaO source
density change
isothermal roasting
linear shrinkage
TG-DSC
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description Calcium hydroxide and Calcium carbonate were used as CaO source to investigate the formation behavior of calcium ferrite in solid state below 1200°C. The density change of CaO–Fe2O3 samples with temperature were in-situ and off-line determined, with linear shrinkage rate test for mixed powders at a heating rate of 10°C/min and with Archimedes method for the pellets isothermal roasted at various temperatures and time, respectively. Phase composition of roasted samples was determined with X-ray powder diffraction method, and TG-DSC analysis was used to understand the decomposition behavior and formation of calcium ferrites in different heating rates. As a result, the formation of Ca2Fe2O5 could occur much earlier when calcium hydroxide was used as raw material; however, the formation rates of CaFe2O4 tend to be faster when calcium carbonate was used when the temperature is higher than 1100°C. In addition, the formation of Ca2Fe2O5 was supposed to be prior to CaFe2O4 in this study when the temperature is lower than 900°C.
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The density change of CaO–Fe2O3 samples with temperature were in-situ and off-line determined, with linear shrinkage rate test for mixed powders at a heating rate of 10°C/min and with Archimedes method for the pellets isothermal roasted at various temperatures and time, respectively. Phase composition of roasted samples was determined with X-ray powder diffraction method, and TG-DSC analysis was used to understand the decomposition behavior and formation of calcium ferrites in different heating rates. As a result, the formation of Ca2Fe2O5 could occur much earlier when calcium hydroxide was used as raw material; however, the formation rates of CaFe2O4 tend to be faster when calcium carbonate was used when the temperature is higher than 1100°C. 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subjects calcium ferrite
CaO source
density change
isothermal roasting
linear shrinkage
TG-DSC
title Influence of CaO Source on the Formation Behavior of Calcium Ferrite in Solid State
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