Recycling Blast Furnace Dust as Raw Material in Iron-Making

Applied Mechanics and Materials Pub Date : 2024-02-05 DOI:10.4028/p-za7paa

Tran Thi Thu Hien, Pham Ngoc Hai, Tran Trung Hai

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Abstract

A large amount of dust is formed as one of the primary by-products during the blast furnace ironmaking process. Iron and carbon are mainly compositions in the dust. Blast furnace dust (BFD) is cycled to protect the environment and recover valuable components. In this study, BFD is used pelletization process with iron ore concentration for raw materials charging to the iron-making furnace. The mixture of BFD and iron ore (30; 40; 50 by mass %) with 2 % bentonite as a binder was used for making pellets. The produced pellets were tested drop strength and fired at 1200 °C for 30 minutes in the atmosphere environment. Fired pellets were examined compressive strength and reduced at 900; 1000; 1100 °C in 30 minutes. Mechanical, porosity and reduction degree properties of reduced pellets were analysed. The results show that green strength and compressive strength are acceptable values. Good porosity is observed when using a high amount of BFD so that it gives a high degree of reduction. XRD, SEM were used for characterization. Iron whiskers were observed in the sample, which was reduced at 1000 °C. It is clearly shown that the pellets using BFD are appropriated for charging to blast furnace as raw materials.

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回收高炉粉尘作为炼铁原料

大量粉尘是高炉炼铁过程中形成的主要副产品之一。粉尘中的主要成分是铁和碳。高炉粉尘（BFD）被循环利用，以保护环境并回收有价值的成分。在本研究中，高炉粉尘与铁矿石浓缩一起用于球团工艺，作为原料装入炼铁炉。BFD 和铁矿石（质量百分比为 30；40；50）的混合物与 2% 的膨润土作为粘合剂被用于制造球团。生产出的球团在 1200 °C 的大气环境中进行了 30 分钟的落锤强度测试和焙烧。在 900、1000 和 1100 °C 温度下，分别在 30 分钟内对烧成的球团进行抗压强度和还原度测试。对还原颗粒的机械性能、孔隙率和还原度进行了分析。结果表明，生坯强度和抗压强度均为可接受值。当使用大量 BFD 时，可观察到良好的孔隙率，因此它能提供较高的还原度。XRD 和 SEM 被用于表征。在 1000 °C 下还原的样品中观察到了铁须。这清楚地表明，使用 BFD 的球团适合作为原材料装入高炉。

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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Applied Mechanics and Materials

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