Effect of FeO on Sintering and Leaching of Calcium Aluminates in the CaO-Al₂O₃-SiO₂ System

Abstract:

The sintering characteristic and leaching property of calcium aluminates in the CaO-Al2O3-SiO2 system with different FeO additions were investigated. FeO decreases the melting temperature of clinker, and makes the clinker not self-pulverizable. As FeO addition increases from 0 to 4%, the main phases of clinkers sintering at 1350 °C are 12CaO•7Al2O3 and 2CaO•SiO2 as well as some CaO•Al2O3 when the mass ratio of Al2O3 to SiO2 is 5.0 and the molar ratio of CaO to Al2O3 is 1.4. The interplanar spacing of 12CaO•7Al2O3 in the clinker increases with the increase of FeO addition, and the proportion of CaO•Al2O3 in the clinker decreases with the increase of FeO addition. FeO does not affect the Al2O3 leaching rate of clinker obviously, but increases the molar ratio of caustic Na2O to Al2O3 in the leached liquor.

• Periodical: Advanced Materials Research (Volumes 581-582)
• Pages: 1014-1017
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.581-582.1014
• Online since: October 2012
• Authors: Xiao Lin Pan, Hai Yan Yu, Kai Wei Dong, Bo Wang, Wu Zhang, Shi Wen Bi
• Keywords: Calcium Aluminates, CaO-Al₂O₃-SiO₂ System, FeO, Leaching, Sintering

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