Characterization and Magnetic Properties of Sintered Glass-Ceramics from Dispersed Fly Ash Microspheres

IF 2.6 4区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Magnetochemistry Pub Date : 2023-07-09 DOI:10.3390/magnetochemistry9070177

E. Fomenko, G. Akimochkina, Y. Knyazev, S. V. Semenov, V. Yumashev, L. Solovyov, A. Anshits

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引用次数: 0

Abstract

The recycling of hazardous industrial waste into high-tech materials with desired properties is of considerable interest since it provides optimal alternatives for its final disposal. Coal fly ash, the major waste generated by coal-fired power plants, contains significant quantities of dispersed microspheres with a diameter smaller than 10 μm, which are anthropogenic atmospheric pollutants PM10. Due to their composition and fine-grained powder morphology, they can be converted into sintered products. In this study, dispersed microspheres from class C fly ash were directly sintered without any additive to form high-strength glass-ceramics with magnetic properties. The optimum processing conditions were achieved at a temperature of 1200 °C, at which samples with a compressive strength of 100.6 MPa were obtained. Sintering reduces the quantity of the glass phase and promotes the formation of larnite, Fe-spinel, ye’elimite, and ternesite. Mössbauer measurements show that the relative concentration of the magnetic phase compared to the paramagnetic one rises almost in order. The sintered sample demonstrates a narrower distribution of the hyperfine magnetic field and a significantly lower value of the coercive field of 25 Oe, which allows proposing such materials as soft magnetic materials. The presented results demonstrate promising industrial applications of hazardous PM10 to minimize solid waste pollution.

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分散粉煤灰微球烧结微晶玻璃的表征及磁性能

将危险工业废物再循环为具有所需性能的高科技材料是一项相当有意义的工作，因为它为其最后处置提供了最佳的替代办法。燃煤电厂产生的主要废弃物煤灰中含有大量直径小于10 μm的分散微球，即人为大气污染物PM10。由于它们的成分和细粒度的粉末形态，它们可以转化成烧结产品。本研究将C类粉煤灰中分散的微球直接烧结，不添加任何添加剂，制成具有磁性的高强微晶玻璃。在1200℃的温度下获得了最佳工艺条件，得到了抗压强度为100.6 MPa的样品。烧结减少了玻璃相的数量，促进了larnite、fe -尖晶石、ye - limitite和ternesite的形成。Mössbauer测量结果表明，磁相相对于顺磁相的相对浓度几乎是按顺序上升的。烧结样品的超细磁场分布较窄，矫顽力场25 Oe值明显降低，可以提出软磁材料等材料。研究结果表明，有害PM10在减少固体废物污染方面具有良好的工业应用前景。

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来源期刊

Magnetochemistry Chemistry-Chemistry (miscellaneous)

CiteScore

3.90

自引率

11.10%

发文量

145

审稿时长

11 weeks

期刊介绍： Magnetochemistry (ISSN 2312-7481) is a unique international, scientific open access journal on molecular magnetism, the relationship between chemical structure and magnetism and magnetic materials. Magnetochemistry publishes research articles, short communications and reviews. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.