Crystallization and rheology of Na2O–CaO–Al2O3–SiO2 melt in the vitrification of technological waste

IF 2.1 3区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Glass Science Pub Date : 2024-02-27 DOI:10.1111/ijag.16660

D. Perret, A. Sierk, N. Pereira Machado, J. Agullo, A. Laplace, I. Bardez-Giboire, I. Hugon

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Abstract

Vitrification of solid technological waste is currently under investigation. For this type of waste made up of metals, minerals, and organic matters, formulation studies were carried out in the NCAS (Na₂O–CaO–Al₂O₃–SiO₂) system in order to define a vitrifying additive to treat the entire waste deposit, while maximizing the waste loading. Main challenge related to this type of waste comes from the presence of alumina in very large quantities in the glass/glass–ceramics melt, enhancing the risk of melt solidification due to a fast and massive crystallization. Melt lock-up can potentially occur at the operating temperature envisaged for the process (1400°C) and is prohibitive because it would lead to a premature stoppage of the process. The results obtained from casting tests, rheological experiments, and thermodynamic modeling enabled to provide an accurate estimation of the risk of melt lock-up for NCAS compositions. It was highlighted that the composition had a major influence on the temperature at which massive crystallization might occur. From all the results obtained, the maximum Al₂O₃ content that could be incorporated in the final material was determined to be close to 50 wt%. The composition of a vitrifying additive was also statistically designed to treat the technological waste of interest.

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技术废物玻璃化过程中 Na2O-CaO-Al2O3-SiO2 熔体的结晶和流变学

目前正在对固体技术废物的玻璃化进行研究。针对这种由金属、矿物和有机物组成的废物，我们在 NCAS（Na2O-CaO-Al2O3-SiO2）系统中进行了配方研究，以确定一种玻璃化添加剂，用于处理整个废物沉积物，同时最大限度地提高废物负荷。这类废料的主要挑战在于玻璃/玻璃陶瓷熔体中含有大量氧化铝，由于快速大量结晶，增加了熔体凝固的风险。在工艺设想的工作温度（1400°C）下可能会出现熔体锁定现象，这将导致工艺过早停止，因而是令人望而却步的。通过浇铸试验、流变实验和热力学建模得出的结果，可以对 NCAS 成分的熔体锁定风险做出准确的估计。结果表明，成分对可能发生大量结晶的温度有重大影响。从获得的所有结果来看，最终材料中可加入的最大 Al2O3 含量接近 50 wt%。此外，还对玻璃化添加剂的成分进行了统计设计，以处理相关的技术废物。

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来源期刊

International Journal of Applied Glass Science MATERIALS SCIENCE, CERAMICS-

CiteScore

4.50

自引率

9.50%

发文量

审稿时长

>12 weeks

期刊介绍： The International Journal of Applied Glass Science (IJAGS) endeavors to be an indispensable source of information dealing with the application of glass science and engineering across the entire materials spectrum. Through the solicitation, editing, and publishing of cutting-edge peer-reviewed papers, IJAGS will be a highly respected and enduring chronicle of major advances in applied glass science throughout this century. It will be of critical value to the work of scientists, engineers, educators, students, and organizations involved in the research, manufacture and utilization of the material glass. Guided by an International Advisory Board, IJAGS will focus on topical issue themes that broadly encompass the advanced description, application, modeling, manufacture, and experimental investigation of glass.