Preparation and performance analysis of gas-quenched steel slag beads

Revue De Metallurgie-cahiers D Informations Techniques Pub Date : 2020-12-01 DOI:10.1051/metal/2019073

Hui Wang, Zhang Wei, Chao Liu, Hongwei Xing, Guo Chen, Yuzhu Zhang

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引用次数: 4

Abstract

The low utilization rate of steel slag in China has exposed serious environmental and social problems. In the present work, the basic oxygen furnace (BOF) slag was modified by blast furnace (BF) slag and then beaded by the means of gas quenching. The gas-quenching rate, bead formation rate, physical properties, microscopic characteristics and free lime (f-CaO) of gas-quenched slag beads were analyzed to broaden the utilization of BOF slag. The results show that the more BF slag is added, the higher the gas-quenching rate is, and the lower the bead formation rate becomes. When no BF slag is added, the beads are mainly composed of magnetite, limonite and melilite. After BF slag is added, a large amount of glass phase and a little amount of Ca2 SiO4 and MgO are found in beads. The content of f-CaO beads decreases after the modified slag is gas quenched at high temperature. Moreover, the more BF slag is added, the higher the elimination rate of f-CaO becomes. Considering the industry standard of steel slag sand in China as well as the gas-quenching rate, physical and chemical properties, the gas-quenched steel slag beads with 5 and 15% BF slag better meet the medium sand standard, which can be used as fine aggregate.

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气淬钢渣微珠的制备及性能分析

中国钢渣利用率低，暴露出严重的环境和社会问题。本文采用高炉炉渣对碱性氧炉炉渣进行改性，然后采用气淬的方法对其进行钢化处理。分析了气淬渣球的气淬速率、球团形成速率、物理性能、微观特征和游离石灰(f-CaO)，拓宽了转炉渣的利用范围。结果表明:炉渣添加量越大，气淬速率越高，球团形成速率越低;当不添加高炉渣时，球团主要由磁铁矿、褐铁矿和镁铝石组成。添加高炉渣后，珠粒中含有大量的玻璃相和少量的Ca2 SiO4和MgO。改性渣经高温气淬后，f-CaO珠含量降低。而且，炉渣添加量越大，f-CaO的去除率越高。综合考虑国内钢渣砂行业标准及气淬率、理化性能，掺5%和15%高炉渣的气淬钢渣微珠较好地满足中砂标准，可作为细骨料使用。

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来源期刊

Revue De Metallurgie-cahiers D Informations Techniques 工程技术-冶金工程

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审稿时长

24 months