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| Effect of Iron Oxides on Activity of Calcium Aluminate Clinker in CaO-Al2O3-SiO2 System |
| Hai-yan YU1,Xiao-lin PAN1,Bao-wei LIU2,Bo WANG1,Shi-wen BI1 |
1. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, Liaoning, China
2. Guangxi Branch, CHALCO, Baise 531400, Guangxi, China |
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Abstract The sintering characteristics at 1350 �� and leaching property at 80 �� of calcium aluminate clinkers in the CaO-Al2O3-SiO2 (C-A-S) system with different additions of FeO and Fe2O3 were investigated. FeO inhibits the conversion of ��-Ca2SiO4 to ��-Ca2SiO4 and makes the clinker not pulverizable. FeO and Fe2O3 inhibit the formation of CaAl2O4, but promote the formation of Ca12Al14O33. The interplanar spacing at (2 1 1) crystal face of Ca12Al14O33 in the clinker increases with the increase of FeO addition, which indicates that FeO forms solid solutions in Ca12Al14O33. The clinkers with Fe2O3 addition form a new phase Ca2Fe2O5, and the amount of Ca2Fe2O5 increases with the increase of Fe2O3 addition. Both FeO and Fe2O3 do not affect the Al2O3 leaching rate of calcium aluminate clinker in sodium carbonate solution, but they increase the molar ratio of caustic Na2O to Al2O3 in the leached liquor.
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Received: 19 April 2013
Published: 13 November 2014
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| Fund:National Outstanding Youth Science Foundation of China |
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Corresponding Authors:
Xiao-Lin PAN
E-mail: panxl@smm.neu.edu.cn
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2014, Vol. 21 
