Recycling of Blast Furnace Slag and Fluorite Tailings into Diopside-Based Glass-Ceramics with Various Nucleating Agents’ Addition

Wei Zhao, Xiaofeng Huang, Bingji Yan, Shaoyan Hu, Hongwei Guo and Dong Chen
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Wei Zhao: School of Iron and Steel, Soochow University, Suzhou 215137, China
Xiaofeng Huang: School of Iron and Steel, Soochow University, Suzhou 215137, China
Bingji Yan: School of Iron and Steel, Soochow University, Suzhou 215137, China
Shaoyan Hu: School of Iron and Steel, Soochow University, Suzhou 215137, China
Hongwei Guo: School of Iron and Steel, Soochow University, Suzhou 215137, China
Dong Chen: School of Iron and Steel, Soochow University, Suzhou 215137, China

Sustainability, 2021, vol. 13, issue 20, 1-17

Abstract: Diopside-based glass-ceramics are successfully produced by recycling blast furnace slag and fluorite tailing with the addition of supplementary elements such as TiO 2 , Fe 2 O 3 and Cr 2 O 3 as nucleation agents, using a conventional melting method. The effects of various nucleating agents on the phase components and structure of the prepared glass-ceramics were evaluated by a differential scanning calorimeter, X-ray diffraction and scanning electron microscope–energy disperse spectrometer methods to determine the optimal dosage of nucleating agents. The results show that, in the preparation of diopside-based glass-ceramics, the suitable percentages of blast furnace and fluorite tailing are 55% and 45%, and the recommended composite nucleating agents consist of 1.5% Cr 2 O 3 , 2% TiO 2 and 3% Fe 2 O 3 . Heat treatment was conducted at a nucleation temperature of 720 °C and a crystallization temperature of 920 °C, and the nucleation and crystallization durations were 1.0 h and 1.5 h, respectively. Under the abovementioned parameters, the obtained diopside-based glass-ceramics displayed a Vickers hardness of 7.12 GPa, density of 2.95 g·cm −3 , water absorption of 0.02%, acid resistance of 0.23% and alkali resistance of 0.02%.

Keywords: blast furnace slag; fluorite tailing; diopside; glass-ceramics; nucleating agent (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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