Effect of shear rate on the rheological and crystallization behaviors of CaO-SiO2-CaF2-Ce2O3 slag melt at high temperature

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-09-01 DOI:10.1016/j.ceramint.2025.06.228

Wentao Guo , Xi Lan , Yongli Jin , Ziqi Ding , Jintao Gao , Zhancheng Guo , Zengwu Zhao

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Abstract

The irreplaceability role of rare earths in high-performance materials, such as ceramics, highlighting the significance of rare earth extraction. Strengthening the crystallization growth of the rare earth phase in rare earth slag is crucial for ensuring effective subsequent rare earth enrichment and separation. However, viscosity plays a major role in the characteristics of high-temperature melts and the crystallization process. In this study, an internal column rotation method was used to measure the viscosity of CaO-SiO₂-CaF₂-Ce₂O₃ slag melts. The effect of shear rate on the rheological behavior of CaO-SiO₂-CaF₂-Ce₂O₃ slag with varying Ce₂O₃ and CaF₂ contents, and CaO/SiO₂ ratio was investigated by examining the viscosity evolution during the rare earth crystallization growth process. The rheological behavior of the CaO-SiO₂-CaF₂-Ce₂O₃ slag was elucidated in regions of liquid phase, low solid phase, and high solid phase, providing insight into the viscosity changes of non-Newtonian flowing melts. Based on this, the effect of shear rate on the crystallization behavior of rare earth phases was investigated to provide a basis for improving the subsequent separation of rare earth phases.

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剪切速率对CaO-SiO2-CaF2-Ce2O3熔渣高温流变和结晶行为的影响

稀土在陶瓷等高性能材料中的不可替代作用，凸显了稀土提取的意义。加强稀土渣中稀土相的结晶生长是保证后续稀土有效富集分离的关键。然而，粘度在高温熔体的特性和结晶过程中起着主要作用。本研究采用内柱旋转法测定CaO-SiO2-CaF2-Ce2O3熔渣的粘度。通过考察稀土结晶生长过程中的黏度变化，研究剪切速率对不同Ce2O3和CaF2含量以及CaO/SiO2比下CaO-SiO2-CaF2-Ce2O3渣流变行为的影响。研究了CaO-SiO2-CaF2-Ce2O3渣在液相、低固相和高固相区域的流变行为，为了解非牛顿流动熔体的粘度变化提供了依据。在此基础上，研究剪切速率对稀土相结晶行为的影响，为后续稀土相分离的改进提供依据。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.