Component Modification of Basic Oxygen Furnace Slag with C 4 AF as Target Mineral and Application

Yanrong Zhao, Pengliang Sun, Ping Chen, Xiaomin Guan, Yuanhao Wang, Rongjin Liu and Jincan Wei
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Yanrong Zhao: College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, China
Pengliang Sun: Guangxi Engineering and Technology Center for Utilization of Industrial Waste Residue in Building Materials, Guilin 541004, China
Ping Chen: College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, China
Xiaomin Guan: College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, China
Yuanhao Wang: Guangxi Engineering and Technology Center for Utilization of Industrial Waste Residue in Building Materials, Guilin 541004, China
Rongjin Liu: College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, China
Jincan Wei: College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, China

Sustainability, 2021, vol. 13, issue 12, 1-9

Abstract: In this paper, a new method of basic oxygen furnace (BOF) slag component modification with a regulator was studied. The main mineral was designed as C 4 AF, C 2 S and C 3 S in modified BOF slag, and the batching method, mineral compositions, hydration rate, activation index and capability of resisting sulfate corrode also were studied. XRD, BEI and EDS were used to characterize the mineral formation, and SEM was used to study the morphology of hydration products. The results show that most inert phase in BOF slag can be converted into active minerals of C 4 AF and C 2 S through reasonable batching calculation and the amount of regulating agent. The formation of C 4 AF and C 2 S in modified BOF slag is better, and a small amount of MgO is embedded in the white intermediate phase, but C 3 S is not detected. With the increase in the CaO/SiO 2 ratio in raw materials, the CaO/SiO 2 ratio of calcium silicate minerals in modified BOF slag increases, the contents of f -CaO are less than 1.0%, and the activity index improves. Compared with the BOF slag, the activity index and exothermic rate of modified BOF slag improved obviously, and the activity index of 90 days is close to 100%. With the increase in modified BOF slag B cement, the flexural strength decrease; however, the capability of resisting sulfate corrode is improved due to the constant formation of a short rod-like shape ettringite in Na 2 SO 4 solution and the improvement of the structure densification of the hydration products.

Keywords: steel slag; component modification; C 4 AF; resisting sulfate corrode (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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