Iron reduction and diopside-based glass ceramic preparation based on mineral carbonation of steel slag
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RESEARCH ARTICLE
Iron reduction and diopside-based glass ceramic preparation based on mineral carbonation of steel slag ZhiBo Tong 1
&
Jingting Sun 1 & Jiang Wang 1 & ZhaoJun Tan 1 & Songli Liu 1
Received: 18 April 2020 / Accepted: 3 August 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this article, a new process for treating steel slag and CO2 simultaneously and preparing calcium carbonate, metallic iron, and glass ceramics without wastewater or gas production is proposed. The reduction of iron and preparation of diopside glass ceramics are studied in this paper, and the results show that the carbon thermal reduction product of the original slag does not reach its melting point, and the slag and iron are well separated in the samples containing the leached steel slag and added silica. Part of the parent glass is converted into a glass ceramic after heat treatment, and the crystalline phases of samples are melilite, diopside, and partial melilite, and diopside and anorthite, respectively. The crystallization activation energy of the best sample in this article is E = 660.664 kJ/mol. The Avrami indices calculated at different heating rates are all less than 3, which indicates that the crystallization mode of the glass involves surface crystallization. This finding is consistent with the results for the prepared glass ceramics. Keywords Mineral carbonation . Steel slag . Glass ceramic . Iron reduction . Carbon dioxide
Introduction In 2019, global crude steel production reached 1.87 billion tons (World Steel Association 2020) and generated a large amount of metallurgical slag and CO2 gas. Steel slag is the most difficult metallurgical slag to process because of its low activity, poor stability, and grindability. To date, many studies have been performed by researchers around the world to determine effective uses of steel slag, which is mainly used as a building material, fertilizer, adsorbent, and soil regulator. However, only parts of the slag are suitable for these applications, which utilize less than 30% of steel slag. Moreover, some of the processing methods are complex, have high processing costs, or produce low value–added materials; therefore, many slags are just being stockpiled, which not only takes up land but also potentially harms water and soil (Blanco-Flores et al. 2018; Huang et al. 2016; Li et al. 2020; Responsible editor: Philippe Garrigues * Songli Liu [email protected] 1
The Key Laboratory of Extraordinary Bond Engineering and Advanced Materials Technology, Yangtze Normal University, Chongqing 408100, China
Shen et al. 2020; Tang et al. 2020; Wang et al. 2019). At the same time, steel enterprises are also one of the main sources of anthropogenic CO2 emissions. Because the greenhouse effect caused by CO2 poses a substantial threat to the environment, in 1990, a CO2 capture and utilization technology in which carbon is sequestered into carbonate by the mineralization of silicate was proposed. This concept was inspired by the process of CO2 absorption by minerals
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