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

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%.

Highly crystallized glass-ceramics from high content gold tailings via a one-step direct cooling method

“…8 ). 31 In contrast, although the crystalline phase diopside structure precipitated from S5 and S6 samples is conducive to improving the flexural strength, there are micropore defects inside the samples (S6 samples are more serious), so the improvement of flexural strength is not great compared with the previous glass samples. 32 As the temperature increases, the crystallization of tailing glass-ceramics increases ( Fig.…”

Research Progress on Iron- and Steelmaking Iste Slag-Based Glass-Ceramics: Preparation and GHG Emission Reduction Potentials

“…The synergistic effect of the composite nucleating agents CaF 2 and P 2 O 5 could increase the crystal growth index n to 3.07, making the system exhibit overall crystallization behavior [25]. It should be pointed out that in the process of optimizing the preparation of BFS-based glass-ceramics, the composite nucleating agent (such as Cr 2 O 3 /TiO 2 ) could affect many aspects of glass-ceramics, such as the crystal structure, grain size, crystal distribution, etc., but would not change the crystalline type of glass-ceramics [26].…”