The Hydration Activity Enhancement Method of Mayenite in Ladle Slag: A Review

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-09-09 DOI:10.1002/srin.202400355

Yiming Duan, Shuai Chao, Xi Zhang, Junguo Li, Yaling Zhang, Chunhui Gu, Jiale He

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Abstract

As a byproduct of the steelmaking process, ladle slag has the potential to be used as an auxiliary cement material in the construction field. However, ladle slag generated after secondary refining is typically handled by air cooling and stacking, leading to the presence of the typical mineral phase mayenite (Ca12Al14O33, abbreviated as C12A7) in a crystalline form within the slag. This reduces its early hydration activity, which adversely affects the compressive strength of concrete and consequently lowers the resource utilization rate of ladle slag. Based on this, this article provides a comprehensive review of the generation process and composition of ladle slag. By discussing the hydration process and hydration products of the typical mineral phase C12A7 in ladle slag, as well as the mutual transformation of hydration products, it is shown that hydration products undergo transformation with increasing temperature. Compared to crystalline C12A7, amorphous, C12A7 exhibits excellent hydration activity. Building upon this, methods for amorphizing C12A7 are elucidated, wherein thermal activation or chemical activation is employed to alter the ordered arrangement of atoms within the crystal structure, thereby reducing the stability of the crystal structure to achieve amorphization of C12A7.

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钢包渣中玛雅橄榄石的水合活性增强方法：综述

作为炼钢过程的副产品，钢包渣有可能被用作建筑领域的水泥辅助材料。然而，二次精炼后产生的钢包渣通常通过空气冷却和堆放来处理，这导致钢渣中的典型矿物相麦饭石（Ca12Al14O33，缩写为 C12A7）以结晶形式存在。这降低了矿渣的早期水化活性，对混凝土的抗压强度产生不利影响，从而降低了钢包矿渣的资源利用率。基于此，本文对钢包炉渣的产生过程和成分进行了全面评述。通过讨论钢包渣中典型矿物相 C12A7 的水化过程和水化产物，以及水化产物的相互转化，表明水化产物会随着温度的升高而发生转化。与结晶 C12A7 相比，无定形 C12A7 具有优异的水化活性。在此基础上，阐明了使 C12A7 非晶化的方法，即利用热激活或化学激活来改变晶体结构内原子的有序排列，从而降低晶体结构的稳定性，以实现 C12A7 的非晶化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.