Nb2O5和碱度对CaO-SiO2-Nb2O5-CeO2-CaF2渣体系粘度和结构的影响

Revue De Metallurgie-cahiers D Informations Techniques Pub Date : 2020-04-01 DOI:10.1051/metal/2020023

Zhuang Ma, Zengwu Zhao, Wentao Guo, Z. Wang

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引用次数: 4

摘要

为了有效利用巴彦鄂博铌精矿，研究了Nb2 - O5和碱度对CaO-SiO2 -Nb2 - O5 -5.0 wt粘度的影响。% CeO2 -5.0 wt。用旋转圆筒法研究了还原气氛中1653 ~ 1813 K的% CaF2渣体系。在相同的条件下，通过x射线衍射和拉曼光谱对淬火后的样品进行了研究。结果表明:黏性流动的粘度、断裂温度和活化能随着Nb2 O5浓度和碱度的增加而降低;拉曼光谱表明，Nb4+离子以不同畸变的[NbO6]八面体形式存在，而[NbO4]四面体在渣中存在较少。Nb2 O5的加入和碱度降低了聚合度，其中复杂的Si-O网络被解聚成简单的结构单元。

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Influence of Nb2O5 and basicity on the viscosity and structure of CaO-SiO2-Nb2O5-CeO2-CaF2 slag system

In order to utilize niobium concentrate of Bayan Obo effectively, the effect of Nb2 O5 and basicity on the viscosity of CaO-SiO2 -Nb2 O5 -5.0 wt.% CeO2 -5.0 wt.% CaF2 slag system was studied from 1653 to 1813 K in reducing atmosphere by rotating cylinder method. For the same condition, the as-quenched samples were investigated through X-ray diffraction and Raman spectroscopy. The results show that the viscosity, break temperature and activation energy of viscous flow decrease with the increase of Nb2 O5 and basicity. Raman spectra show that the Nb4+ ions exist in the form of [NbO6 ] octahedron with different distortion and little [NbO4 ] tetrahedron in the slags. The Nb2 O5 addition and basicity lower the degree of polymerization, where the complex Si-O network is depolymerized into simple structural units.

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来源期刊

Revue De Metallurgie-cahiers D Informations Techniques 工程技术-冶金工程

自引率

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审稿时长

24 months