Effect of Fe2O3 on Crystallization Behavior of CaO-MgO-Al2O3-SiO2 Glass-Ceramics Based on Copper Tailings

Abstract

Abstract: CaO-MgO-Al₂O₃-SiO₂ (CMAS) glass-ceramics were prepared by melting method using copper tailings as main raw material. The crystallization behavior of fine-grained copper tailings based CMAS glass-ceramics was optimized by adding Fe₂O₃ crystal nucleation agent. The effect of nucleation agent content on the crystallization behavior and physical properties of fine-grained copper tailings based CMAS glass-ceramics was studied by DSC, XRD and SEM, and the crystallization kinetics parameters were calculated by Ozawa-Chen method. The results show that when the amount of Fe₂O₃ crystal nucleation agent is more than 3.72%(mass fraction), the glass-ceramics prepared from fine-grained copper tailings can achieve overall crystallization. The precipitation of pyroxene phase is the result of coordination of Fe and Mg elements in glass phase into [Si(Al)O₄] tetrahedral lattice. In addition, the increase of Fe³⁺ is conducive to the precipitation of pyroxene phase and reduces crystallization activation energy. The crystallization behavior and mechanical properties of fine-grained copper tailings based glass-ceramics are optimized by Fe₂O₃ crystal nucleation agent.

Key words: fine-grained copper tailing, glass-ceramics, Fe₂O₃, crystallization behavior, crystallization kinetics simulation, pyroxene phase

CLC Number:

TQ171

SHI Linyun, XU Yuhua, WEI Qi. Effect of Fe₂O₃ on Crystallization Behavior of CaO-MgO-Al₂O₃-SiO₂ Glass-Ceramics Based on Copper Tailings[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(11): 3844-3851.

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Effect of Fe₂O₃ on Crystallization Behavior of CaO-MgO-Al₂O₃-SiO₂ Glass-Ceramics Based on Copper Tailings

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