Research status of improving volume stability of steel slag by pretreatment
YAN Feng1,2, HUANG Xiao-ming1,2, GUO Rong-xin1,2, FENG Ming-jie1,2, ZHANG Shuai1,2, LI Hao1,2
1. Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, Yunnan, China; 2. Yunnan Key Laboratory of Disaster Reduction in Civil Engineering, Kunming 650500, Yunnan, China
Abstract：The volume restlessness of steel slag is one of the main factors restricted its application in road materials. The volume stability pretreatment of steel slag is the key to effective utilization of steel slag, and also is the necessary condition to improve the utilization rate of steel slag in the direction of road materials. In view of volume restfulness for steel slag, the research progress and present situation of volume restfulness of steel slag at home and abroad are summarized from four aspects, that are, physical property of steel slag, factors causing volume restfulness of steel slag, determination methods of volume restfulness for steel slag and pretreatment measures for improving volume restfulness of steel slag. The results show that performance of steel slag is good, but the mineral composition is complex. The main factors causing the volume restlessness of steel slag are free calcium oxide and free magnesium oxide, which can make steel slag expand and crack under certain conditions and restrict the application of steel slag. Ethylene glycol-EDTA-TG differential thermal analysis and EDTA titration are more accurate and common methods for the determination of free calcium oxide and free magnesium oxide in steel slag. Most of domestic pretreatment improvement measures are aimed at the free calcium oxide in steel slag, including natural aging, steam curing, the surface modification treatment, chemical treatment and carbonization processing. Among them, surface modification and chemical treatment for pretreatment of steel slag measures are hot spots in recent years, while carbonization can cut steel slag expansive rate around 70% to 90%, which has better effect compared with other pretreatment measures, but its equipment requirements and costs are higher. Foreign countries mainly adopt natural aging method to improve the volume stability of steel slag. Therefore, the application on a large scale for pretreatment of steel slag needs to have social, economic, environmental and other benefits at the same time, which requires researchers to carry more in-depth research and discussion. Finally, suggestions and prospects for the future development of steel slag resource utilization in road materials are put forward based on previous studies.
颜峰, 黄小明, 郭荣鑫, 冯明杰, 张帅, 李昊. 预处理改善钢渣体积安定性的研究现状[J]. 钢铁, 2022, 57(10): 30-42.
YAN Feng, HUANG Xiao-ming, GUO Rong-xin, FENG Ming-jie, ZHANG Shuai, LI Hao. Research status of improving volume stability of steel slag by pretreatment[J]. Iron and Steel, 2022, 57(10): 30-42.
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