Thermodynamic Characteristics of Ferronickel Slag Sintered in the Presence of Magnesia
The rotary kiln-electric furnace (RKEF) process has undergone a rapid development during the past decade, producing a significant quantity of ferronickel slag. At present, the ferronickel slag has become the fourth largest industrial solid waste in China with a utilization ratio of less than 10 wt%. It is urgent to seek an efficient method for utilization of ferronickel slag. In this study, the thermodynamic characteristics of ferronickel slag sintered in the presence of magnesia (additive) for preparing refractory materials were assessed by calculating relevant thermodynamic functions and phase diagrams. The thermodynamic results showed that by sintering ferronickel slag with the addition of magnesia at appropriate temperatures, it is possible to promote the formation of forsterite and spinel phases, which would contribute to high refractoriness of the refractory materials derived from the slag.
KeywordsThermodynamic characteristics Sintering Ferronickel slag Refractory materials Phase diagram
This work was partially supported by the National Natural Science Foundation of China under Grants 51774337, 51504297, and 51811530108, the Natural Science Foundation of Hunan Province, China, under Grant 2017JJ3383, 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 Fundamental Research Funds for the Central Universities of Central South University under Grants 2018zzts220 and 2018zzts779, the Co-Innovation Center for Clean and Efficient Utilization of Strategic Metal Mineral Resources under Grant 2014-405, the Guangdong Guangqing Metal Technology Co. Ltd. under Grant 738010210, the Innovation-Driven Program of Central South University under Grant 2016CXS021, and the Shenghua Lieying Program of Central South University under Grant 502035001.
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