Removal behavior of Zn and alkalis from blast furnace dust in pre-reduction sinter process

IF 3.8 4区工程技术 Q2 CHEMISTRY, MULTIDISCIPLINARY

Green Processing and Synthesis Pub Date : 2023-01-01 DOI:10.1515/gps-2023-0045

Guiqing Zhao, Ruoyan Li, Xiangdong Xing, J. Ju, Xinyi Li, Jian-e Zu

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引用次数: 1

Abstract

Abstract In this study, iron concentrate and blast furnace dust were used as raw materials, and graphite was used as a reducing agent for mixing and briquetting. The briquettes were roasted in a high-temperature tube furnace at different temperatures and held for a certain time to simulate the pre-reduction sintering process. The effects of dust content, reduction time, and reduction temperature on the removal rate of zinc, potassium, and sodium and the metallization rate of the pre-reduction sintered products were investigated. The reduced briquettes were characterized by X-ray diffraction, scanning electron microscopy-energy dispersive spectroscopy, and flame atomic absorption spectroscopy to further explore the mechanisms of zinc, potassium, and sodium removal. The Zn removal rate and metallization rate increased gradually with the increase in dust content, reaching 97.57% and 87.14% at 30% dust content, respectively. Both K and Na removal rates reached a maximum of 83.57% and 94.78%, respectively, at 25% dust content. With the increase in reduction time and temperature, the removal rate of the three elements and the metallization rate gradually increased. When the briquettes with 20% blast furnace (BF) dust content were reduced at 1,200℃ for 20 min, the removal rates of zinc, potassium, and sodium reached 95.66%, 79.97%, and 91.49%, respectively, and the metallization rate reached 84.77%. It shows that the pre-reduction sintering process can effectively remove Zn, K, and Na from the BF dust and meet the requirements of subsequent BF production. The research results can provide some theoretical basis for industrial production.

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预还原烧结过程中高炉烟尘中锌和碱的去除行为

摘要本研究以铁精矿和高炉烟尘为原料，以石墨为还原剂进行混合成型。将压块在高温管式炉中在不同温度下焙烧并保温一定时间，以模拟预还原烧结过程。研究了粉尘含量、还原时间和还原温度对预还原烧结产品锌、钾、钠去除率和金属化率的影响。通过X射线衍射、扫描电子显微镜能量色散光谱和火焰原子吸收光谱对还原型煤进行了表征，以进一步探索锌、钾和钠的去除机理。随着含尘量的增加，锌去除率和金属化率逐渐提高，在含尘量为30%时分别达到97.57%和87.14%。当含尘量为25%时，K和Na的去除率分别达到83.57%和94.78%。随着还原时间和温度的增加，三种元素的去除率和金属化率逐渐提高。当高炉含尘量为20%的型煤在1200℃下降低20 min时，锌、钾、钠的去除率分别达到95.66%、79.97%和91.49%，金属化率达到84.77%。表明预还原烧结工艺可以有效地去除高炉烟尘中的锌、钾和钠，满足后续高炉生产的要求。研究结果可为工业生产提供一定的理论依据。

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来源期刊

Green Processing and Synthesis CHEMISTRY, MULTIDISCIPLINARY-ENGINEERING, CHEMICAL

CiteScore

6.70

自引率

9.30%

发文量

审稿时长

7 weeks

期刊介绍： Green Processing and Synthesis is a bimonthly, peer-reviewed journal that provides up-to-date research both on fundamental as well as applied aspects of innovative green process development and chemical synthesis, giving an appropriate share to industrial views. The contributions are cutting edge, high-impact, authoritative, and provide both pros and cons of potential technologies. Green Processing and Synthesis provides a platform for scientists and engineers, especially chemists and chemical engineers, but is also open for interdisciplinary research from other areas such as physics, materials science, or catalysis.