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Study on relationships between cooling conditions and structure changes of molten slag
Li Yu 1 * #,Liu Xiaoming 2,Cang Daqing 3
1.State Key Laboratory of Advanced Metallurgy,University of Science and Technology of Beijing, Beijing 100083
2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, China 100083
3.State Key Laboratory of Advanced Metallurgy,University of Science and Technology of Beijing, BeiJing, 100083
*Correspondence author
#Submitted by
Subject:
Funding: This work has been financially supported by Research Fund for the Doctoral Program of Higher Education of China （No.NO. 20100006120010）, the National Natural Science Foundation of China（No.NO. 51034008，NO. 51104008）
Opened online:22 July 2013
Accepted by: none
Citation: Li Yu,Liu Xiaoming,Cang Daqing.Study on relationships between cooling conditions and structure changes of molten slag[OL]. [22 July 2013] http://en.paper.edu.cn/en_releasepaper/content/4551309
 
 
Properties of slag have an important effect on its cooling process and subsequent utilization of slag and are affected by the changes of structure in slag. In the paper, blast furnace slag（BFS）re-melted respectively at 1350℃, 1450℃ and 1550℃ were water-quenched to prepare samples, along with an air-quenched sample re-melted at 1450℃ as reference. The samples were investigated by using XRD, DTA and NMR. The results show that two transformation types of aluminosilicates structure exist in the melts under different cooling condition. A high temperature transformation (HTT) would occur when melts cooled under very slow or very fast cooling speed and would respectively leaded the melts to precipitate melilite crystals or freeze into homogeneous glass phase. The other is a low temperature transformation (LTT), which would happen when a sub-stable phase-separated structure came into being in the melts cooled under a relative slow or fast cooling speed. And it would respectively lead the melts precipitate mervinite crystals or freeze into phase-separated glass phase. The sub-stable phase-separated structure is a coexistence structure of high polymeric Q4(2Al) or melilite units (Si-rich phase) with low polymeric Q0 units (Ca-rich phase). Mg2+ would change its coordination from 4 to 6 during LTT, which increases the amounts of Q0 units and is contributed to the formation of the phase-separated structure.
Keywords:Aluminosilicates structure; molten slag; sub-stable phase separation; cooling speed
 
 
 

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