Structural behavior of F− in mould flux melt of CaO-SiO2-Al2 O3-Na2 O-CaF2 system

IF 3.1 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING
Qiang Gao , Yi Min , Cheng-jun Liu , Mao-fa Jiang
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引用次数: 2

Abstract

The influence of fluorine on the structure of CaO-SiO2-Al2O3-Na2O-CaF2 continuous-casting-type slag was measured by Raman spectroscopy, and the degree of polymerization of mould flux and the structural behavior of F in the melt were investigated by classifying and quantifying the structural species of F ions. The results exhibit that the main structural units of Si-O tetrahedra are Q0, Q1 and Q2 and the actual measured number of non-bridging oxygen ions in the [SiO4]-tetrahedra (denoted by NBO/T) increases from 2. 73 to 3. 44 with increasing the molar ratio of F to (F+O) (denoted by XF/X(F+O)) from 0. 06 to 0. 19. It means that the degree of polymerization of melt structure decreases with an increase in XF/X(F+O). In addition, most of F ions were distributed in Si-O tetrahedra and Al-O tetrahedra. With increasing XF/X(F+O), the complex structural units Al-O tetrahedra are gradually replaced by discrete structural units AlF1– because of the breakage of Al-O bonds in Al-O tetrahedra by F ions, and the Si-O (bridging oxygen) bonds of Si-O tetrahedra are broken to form [SiOnF1–n]-tetrahedra by F ions coordinating with Si4+.

cao - sio2 - al2o3 - na2o3 - caf2体系助熔剂熔体中F−的结构行为
采用拉曼光谱法测定了氟对CaO-SiO2-Al2O3-Na2O-CaF2连铸型渣结构的影响,并通过对F -离子的结构种类进行分类和量化,研究了熔体中熔剂的聚合程度和F -的结构行为。结果表明,Si-O四面体的主要结构单元为Q0、Q1和Q2, [SiO4]-四面体中实际测量的非桥氧离子数(用NBO/T表示)从2增加。73比3。随着F与(F+O)的摩尔比(用XF/X(F+O)表示)从0开始增大。从06到0。19. 这意味着熔体结构的聚合程度随着XF/X(F+O)的增加而降低。此外,大部分的F -离子分布在硅氧四面体和铝氧四面体中。随着XF/X(F+O)的增加,由于氟离子破坏了Al-O四面体中的Al-O键,复杂结构单元Al-O四面体逐渐被离散结构单元AlF1 -取代,而Si-O四面体的Si-O(桥氧)键被氟离子与Si4+配位破坏形成[SiOnF1-n]-四面体。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
4.30
自引率
0.00%
发文量
2879
审稿时长
3.0 months
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