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Abstract
Diopside-based glass-ceramics are successfully produced by recycling blast furnace slag and fluorite tailing with the addition of supplementary elements such as TiO2, Fe2O3 and Cr2O3 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% Cr2O3, 2% TiO2 and 3% Fe2O3. 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%.
Highlights
Paolo FanizziBlast furnace slags are the major by-products in the ironmaking and steelmaking process, and its output is approximately 0.3 tons per ton of pig iron
Previous literature [10,11,12] has reported that quartz sand, clay, kaolin and pure silica could be selected as proper supplements due to the relatively higher content of SiO2 during the blast furnace slag glass-ceramics preparation
The effects of nucleating agents on the diopside-based glass-ceramics prepared from blast furnace slag and fluorite tailing were investigated in this paper
Summary
Paolo FanizziBlast furnace slags are the major by-products in the ironmaking and steelmaking process, and its output is approximately 0.3 tons per ton of pig iron. 200 billion tons of blast furnace slag are generated per year, 40% of which are subjected to landfilling without further utilization [1,2,3]. The recycle and comprehensive utilization of blast furnace slags and fluorite tailings are significant in order to solve the considerable waste of resources and environmental pollution. Previous literature [10,11,12] has reported that quartz sand, clay, kaolin and pure silica could be selected as proper supplements due to the relatively higher content of SiO2 during the blast furnace slag glass-ceramics preparation. Some researchers put forward that glass-ceramics could be prepared by blast furnace slag with the addition of other industrial solid waste. Yang et al [13,14,15,16] investigated the preparation
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