Valorization of Ferronickel Slag into Refractory Materials: Effect of Sintering Temperature
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Preparation of refractory materials from ferronickel slag by sintering over a broad temperature range (1200°C to 1500°C) with addition of sintered magnesia was explored. The thermodynamic calculations indicated that the amounts of newly generated high-melting-point forsterite and spinel phases increase with increasing temperature. The experimental analysis demonstrated that elevating the sintering temperature promoted conversion and crystallization of forsterite and spinel phases from the original phase of the slag, with simultaneous reduction of low-melting-point enstatite. There was also rapid growth of spinel grains from about 0.5 μm to 5 μm, which should be controlled by selecting an appropriate temperature. The results showed that, by sintering the slag at 1400°C for 3 h with addition of 20 wt.% sintered magnesia, a high-quality refractory material with refractoriness of 1680°C, bulk density of 2.93 g/cm3, apparent porosity of 1.81%, and compressive strength of 166.62 MPa was obtained.
This work was partially supported by the National Natural Science Foundation of China under Grant 51774337, the Key Laboratory for Solid Waste Management and Environment Safety (Tsinghua University) Open Fund under Grant SWMES2017-04, the Project of State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials under Grant 17kffk11, the Innovation-Driven Program of Central South University under Grant 2016CXS021, the Shenghua Lieying Program of Central South University under Grant 502035001, and the Fundamental Research Funds for the Central Universities of Central South University under Grants 2018zzts220 and 2018zzts779.
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