Effect of B2O3 on the crystallization behavior and properties of glass-ceramics prepared from copper slag reduction tailings
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The chemical composition of copper slag reduction tailings is similar to that of CaO–Al2O3–SiO2–Fe2O3 system glass-ceramics. Utilizing the copper slag reduction tailings as the primary raw material, glass-ceramics were prepared by the meltingmethod, offering an effective approach for the high-value utilization of copper slag. The effects of varying B2O3 contenton the crystallization kinetics, phase composition, and properties of the glass-ceramics were investigated using techniquessuch as thermogravimetry–differential scanning calorimetry, X-ray diffraction, and scanning electron microscopy coupledwith energy-dispersive spectroscopy. The addition of B2O3 reduced both the nucleation and crystallization temperaturesof the glass-ceramics, thereby promoting crystallization and transforming the crystallization mechanism from surfacecrystallization to bulk crystallization. With increasing B2O3 content, the crystallization activation energy (E) of the glassceramicsinitially decreased and then increased. The predominant crystalline phase precipitated in the glass-ceramics wasanorthite, accompanied by an increased precipitation of wollastonite. The glass-ceramic containing 6 wt% B2O3 exhibited thebest overall performance, with a bulk density of 2.95 g·cm⁻³, a water absorption rate of 0.51%, a microhardness of 886.32HV, and a flexural strength of 230 MPa. In addition, the mass loss rates under acid and alkali resistance tests were 2.2%and 1.9%, respectively.
Abstract
The chemical composition of copper slag reduction tailings is similar to that of CaO–Al2O3–SiO2–Fe2O3 system glass-ceramics. Utilizing the copper slag reduction tailings as the primary raw material, glass-ceramics were prepared by the meltingmethod, offering an effective approach for the high-value utilization of copper slag. The effects of varying B2O3 contenton the crystallization kinetics, phase composition, and properties of the glass-ceramics were investigated using techniquessuch as thermogravimetry–differential scanning calorimetry, X-ray diffraction, and scanning electron microscopy coupledwith energy-dispersive spectroscopy. The addition of B2O3 reduced both the nucleation and crystallization temperaturesof the glass-ceramics, thereby promoting crystallization and transforming the crystallization mechanism from surfacecrystallization to bulk crystallization. With increasing B2O3 content, the crystallization activation energy (E) of the glassceramicsinitially decreased and then increased. The predominant crystalline phase precipitated in the glass-ceramics wasanorthite, accompanied by an increased precipitation of wollastonite. The glass-ceramic containing 6 wt% B2O3 exhibited thebest overall performance, with a bulk density of 2.95 g·cm⁻³, a water absorption rate of 0.51%, a microhardness of 886.32HV, and a flexural strength of 230 MPa. In addition, the mass loss rates under acid and alkali resistance tests were 2.2%and 1.9%, respectively.