High-temperature assimilation behavior of steel slag tailings for iron ore sintering

IF 7.9 2区环境科学与生态学 Q1 ENGINEERING, CHEMICAL

Process Safety and Environmental Protection Pub Date : 2026-07-27 DOI:10.1016/j.psep.2026.109357

Tuo Pan, Zhiwei Peng, Wanlong Fan, Huibo Liu, Qiang Zhong, Shaochang Nie, Lin Xiong

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引用次数: 0

Abstract

Steel slag is a major difficult-to-utilize by-product of the steel industry. The utilization of its tailings, remaining after crushing and magnetic separation of steel beads, holds a significant value. Due to their residual iron content and high levels of calcium and magnesium oxides, these tailings have the potential to be recycled back into the iron ore sintering process. In this study, high-temperature assimilation behavior of steel slag tailings (SST) was investigated using a micro-sintering approach. The effects of CaO addition (10–20 wt%) and temperature (1280 – 1320 °C) on their phase evolution and bonding behavior were systematically analyzed using thermodynamic calculations, TG–DSC, XRD, and SEM–EDS analyses. The results indicated that an appropriate CaO addition (15 wt%) promoted the formation of a continuous Ca2FeAlO5 bonding phase network, whereas excessive CaO promoted the RO phase formation and weakened the bonding structure. The optimal condition was identified as 1320 °C with the addition of 15wt% CaO, under which the highest bonding extent (1.03g/g) and compressive strength (184N) were achieved. These findings are anticipated to provide guidance for the application of SST in iron ore sintering.

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铁矿石烧结用钢渣尾矿的高温同化行为

钢渣是钢铁工业的主要难利用副产品。该尾矿经钢微珠破碎、磁选后的剩余尾矿利用具有重要价值。由于其残余的铁含量和高水平的钙和镁氧化物，这些尾矿有可能被回收到铁矿石烧结过程中。采用微烧结方法研究了钢渣尾矿的高温同化行为。通过热力学计算、TG-DSC、XRD和SEM-EDS分析，系统分析了CaO添加量（10-20 wt%）和温度（1280 - 1320℃）对其相演化和键合行为的影响。结果表明，适当的CaO添加量（15 wt%）促进了连续Ca2FeAlO5键合相网络的形成，而过量的CaO则促进了RO相的形成，削弱了键合结构。在1320℃，CaO添加量15wt%的条件下，可获得最高的结合度（1.03g/g）和抗压强度（184N）。这些研究结果有望为SST在铁矿石烧结中的应用提供指导。

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来源期刊

Process Safety and Environmental Protection 环境科学-工程：化工

CiteScore

11.40

自引率

15.40%

发文量

929

审稿时长

8.0 months

期刊介绍： The Process Safety and Environmental Protection (PSEP) journal is a leading international publication that focuses on the publication of high-quality, original research papers in the field of engineering, specifically those related to the safety of industrial processes and environmental protection. The journal encourages submissions that present new developments in safety and environmental aspects, particularly those that show how research findings can be applied in process engineering design and practice. PSEP is particularly interested in research that brings fresh perspectives to established engineering principles, identifies unsolved problems, or suggests directions for future research. The journal also values contributions that push the boundaries of traditional engineering and welcomes multidisciplinary papers. PSEP's articles are abstracted and indexed by a range of databases and services, which helps to ensure that the journal's research is accessible and recognized in the academic and professional communities. These databases include ANTE, Chemical Abstracts, Chemical Hazards in Industry, Current Contents, Elsevier Engineering Information database, Pascal Francis, Web of Science, Scopus, Engineering Information Database EnCompass LIT (Elsevier), and INSPEC. This wide coverage facilitates the dissemination of the journal's content to a global audience interested in process safety and environmental engineering.