Preparation and Properties of Iron Tailings Porous Ceramics Using Silicon Carbide as Foaming Agent
NIU Shunan1, ZHENG Lijun1,*, GAO Yimeng1, QU Jiayin1, WANG Jifu1, WANG Peng2
1 School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, Liaoning, China 2 Anshan Hefeng Refractories Co.,Ltd., Anshan 114225, Liaoning, China
Abstract: Iron tailings (IOT) porous ceramics were successfully prepared by using Anshan iron tailings as the main raw material, supplemented with Al2O3, sodium tetraborate and SiC, using the foaming method combined with the atmospheric pressure sintering technique under the condition of holding temperature of 1 110—1 140 ℃ for 30 min. The effects of sintering temperature and SiC blowing agent addition on the microstructure and properties of the porous ceramics were systematically investigated. It was shown that the mineral phases of the porous ceramics were mainly cristobalite, quartz, hematite and anorthite. The addition of SiC blowing agent significantly optimizes the pore structure of the samples, increases the apparent porosity, and enhances the compressive strength to a certain extent, but has relatively little effect on the thermal conductivity. In contrast, the effect of sintering temperature on thermal conductivity was more significant, when the sintering temperature was increased to 1 130 ℃, the pore structure tends to be homogeneous, and the thermal conductivity is reduced to the minimum, which effectively improves the thermal insulation performance of the samples. When the addition amount of SiC was 3%, the pore structure of the sample was more uniform at 1 130 ℃ for 30 min. The bulk density was 0.85 g/cm3, the apparent porosity was 62.06%, the compressive strength was 8.69 MPa, and the thermal conductivity is 0.30 W/(m·K), and in this case, the porous ceramics prepared has a better structure and performance, indicating that IOT is suitable for doing thermal insulation materials.
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2026, Vol. 40 
