@article{8c0c311c993a49a9ab672ba3c8c59a65,
title = "Promoting spinel formation and growth for preparation of refractory materials from ferronickel slag",
abstract = "The study provides a method for improving the quality of the refractory material prepared from ferronickel slag by promoting the spinel formation and growth in the slag which was sintered with sintered magnesia and chromium oxide in a broad sintering temperature range from 1200°C to 1500°C. According to the thermodynamic analysis, except for forsterite due to the addition of sintered magnesia, a number of high-melting point spinel phases can also be formed in the presence of chromium oxide and this trend becomes more apparent with increasing sintering temperature, along with declined presence of low-melting point clinopyroxene, mainly enstatite. This expectation was verified by conversion of a part of the original phase of ferronickel slag, olivine, to two main spinel phases, including magnesium aluminate spinel and donathite which was produced by the replacement of nontoxic Cr3+ ions with Fe3+ ions in the octahedral vacancies of magnesium chromate spinel. The formation and growth of these spinel phases were promoted by elevating temperature from 1200°C to 1500°C, which accelerated the transition of initially generated enstatite to a glassy phase, in favor of densification. The formation and growth of spinel during sintering contributed to high refractoriness and compressive strength of the resulting refractory materials.",
keywords = "densification, ferronickel slag, refractory materials, sintering temperature, spinel",
author = "Foquan Gu and Zhiwei Peng and Yuanbo Zhang and Huimin Tang and Weiguang Tian and Joonho Lee and Mingjun Rao and Guanghui Li and Tao Jiang",
note = "Funding Information: This work was partially supported by the National Natural Science Foundation of China under Grant 51774337, the Science and Technology Planning Project of Hunan Province, China, under Grant 2019RS2008, the Key Laboratory for Solid Waste Management and Environment Safety (Tsinghua University) Open Fund under Grant SWMES2017‐04, the Open Project of State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials under Grant 17kffk11, the Co‐Innovation Center for Clean and Efficient Utilization of Strategic Metal Mineral Resources under Grant 2014‐405, the Open Sharing Fund for the Large‐Scale Instruments and Equipments of Central South University under Grant CSUZC201905, and the Fundamental Research Funds for the Central Universities of Central South University under Grants 2018zzts220 and 2018zzts779. Funding Information: This work was partially supported by the National Natural Science Foundation of China under Grant 51774337, the Science and Technology Planning Project of Hunan Province, China,?under Grant?2019RS2008, the Key Laboratory for Solid Waste Management and Environment Safety (Tsinghua University) Open Fund under Grant SWMES2017-04, the Open Project of State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials under Grant 17kffk11, the Co-Innovation Center for Clean and Efficient Utilization of Strategic Metal Mineral Resources under Grant 2014-405, the Open Sharing Fund for the Large-Scale Instruments and Equipments of Central South University under Grant CSUZC201905, and the Fundamental Research Funds for the Central Universities of Central South University under Grants 2018zzts220 and 2018zzts779. Publisher Copyright: {\textcopyright} 2020 The American Ceramic Society",
year = "2020",
month = jul,
day = "1",
doi = "10.1111/ijac.13481",
language = "English",
volume = "17",
pages = "1701--1712",
journal = "International Journal of Applied Ceramic Technology",
issn = "1546-542X",
publisher = "Wiley-Blackwell",
number = "4",
}