Crystallization behavior of MgO-Al2O3-SiO2 glass-ceramics prepared by directly heat-treating of laterite ore smelting slag
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In this paper, we proposed a novel method to prepare MgO-Al2O3-SiO2 (MAS) glass-ceramics through direct heat treatmentwith the slag of laterite ore. First, the Ni-Fe alloy and slag glass were prepared simultaneously by this method, and the yieldrate of Ni-Fe alloy was up to 95.69%. Then, the MAS glass-ceramics can be obtained by direct heat-treating for the slag glass. The energy consumption of glass-ceramics production was much lower than that in traditional method to make full use of thethermal energy of the molten slag. The crystallization behavior of the glass-ceramics was investigated by XRD, DSC andFESEM. The results demonstrate that many phase-separated droplets appear in the slag glass. During the heat treatment, thephase-separated droplets as favorable nucleation sites to inducing crystallization. The crystallinity and crystallite size of thesamples exhibits an increasing tendency with the increase of heat treatment temperature and time. The crystalline phases ofglass-ceramics were two different compositions magnesium aluminum silicates (MgAl2Si4O12 and (Mg,Al)SiO3). The activationenergies of the slag glass were calculated by Kissinger and Ozawa method, which were 308.81 and 309.36 kJ·mol-1, respectively. And the crystallization mechanism of the glass-ceramics was dominated by both the surface crystallization and bulkcrystallization with one-dimensional growth.
Abstract
In this paper, we proposed a novel method to prepare MgO-Al2O3-SiO2 (MAS) glass-ceramics through direct heat treatmentwith the slag of laterite ore. First, the Ni-Fe alloy and slag glass were prepared simultaneously by this method, and the yieldrate of Ni-Fe alloy was up to 95.69%. Then, the MAS glass-ceramics can be obtained by direct heat-treating for the slag glass. The energy consumption of glass-ceramics production was much lower than that in traditional method to make full use of thethermal energy of the molten slag. The crystallization behavior of the glass-ceramics was investigated by XRD, DSC andFESEM. The results demonstrate that many phase-separated droplets appear in the slag glass. During the heat treatment, thephase-separated droplets as favorable nucleation sites to inducing crystallization. The crystallinity and crystallite size of thesamples exhibits an increasing tendency with the increase of heat treatment temperature and time. The crystalline phases ofglass-ceramics were two different compositions magnesium aluminum silicates (MgAl2Si4O12 and (Mg,Al)SiO3). The activationenergies of the slag glass were calculated by Kissinger and Ozawa method, which were 308.81 and 309.36 kJ·mol-1, respectively. And the crystallization mechanism of the glass-ceramics was dominated by both the surface crystallization and bulkcrystallization with one-dimensional growth.
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