Thermodynamics property and structure evolution of the TiO2-containing molten slag with different CaO/SiO2 ratio and TiO2 content

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS Ceramics International Pub Date : 2024-07-07 DOI:10.1016/j.ceramint.2024.07.063

Renze Xu, Zhen Wang

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Abstract

The influences of temperature and compositions (TiO₂ and CaO/SiO₂) on thermodynamics properties and structural evolutions of TiO₂-CaO-Al₂O₃-MgO-SiO₂ slags were investigated in this work. The slag viscosities increased with decreasing the temperature and declined with adding TiO₂. With the raising of CaO/SiO₂ ratio, the viscosity decreased under high temperatures, while it increased with the temperature further decreased lower than 1420 °C. The enthalpy change of the slag increased with raising the temperature as well as the TiO₂ content and reduced with the CaO/SiO₂ ratio increasing. Both the liquidus temperature and break point temperature of the slags decreased with adding TiO₂ and increased with raising the CaO/SiO₂ ratio. Temperature had a significant effect on slag structure evolutions, which decreased the slag polymerization degree. With adding TiO₂ and CaO/SiO₂ ratio in slags, the slag structure stability was weakened by increasing the amount of simpler silicate and TiO₆ units and reducing the proportion of complex Ti-O units. Both the temperature and compositions (TiO₂ and CaO/SiO₂) depolymerized the slag structure to decline the viscosity.

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不同 CaO/SiO2 比率和 TiO2 含量下含 TiO2 熔渣的热力学性质和结构演变

这项工作研究了温度和成分（TiO2 和 CaO/SiO2）对 TiO2-CaO-Al2O3-MgO-SiO2 炉渣热力学性质和结构演变的影响。炉渣粘度随着温度的降低而增加，随着 TiO2 的加入而降低。随着 CaO/SiO2 比率的增加，高温下的粘度降低，而随着温度进一步降低（低于 1420 °C），粘度增加。炉渣的焓变随着温度和 TiO2 含量的增加而增加，随着 CaO/SiO2 比率的增加而减少。炉渣的液相温度和断裂点温度都随着 TiO2 的添加而降低，并随着 CaO/SiO2 比率的增加而升高。温度对炉渣结构演变有显著影响，降低了炉渣聚合度。随着炉渣中 TiO2 的添加和 CaO/SiO2 比的提高，炉渣结构的稳定性减弱，增加了较简单的硅酸盐和 TiO6 单元的数量，减少了复杂的 Ti-O 单元的比例。温度和成分（TiO2 和 CaO/SiO2）都使炉渣结构解聚，从而降低了粘度。

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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.