TY - JOUR
T1 - Promoting spinel formation and growth for preparation of refractory materials from ferronickel slag
AU - Gu, Foquan
AU - Peng, Zhiwei
AU - Zhang, Yuanbo
AU - Tang, Huimin
AU - Tian, Weiguang
AU - Lee, Joonho
AU - Rao, Mingjun
AU - Li, Guanghui
AU - Jiang, Tao
N1 - 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:
© 2020 The American Ceramic Society
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/7/1
Y1 - 2020/7/1
N2 - 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.
AB - 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.
KW - densification
KW - ferronickel slag
KW - refractory materials
KW - sintering temperature
KW - spinel
UR - http://www.scopus.com/inward/record.url?scp=85079422441&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85079422441&partnerID=8YFLogxK
U2 - 10.1111/ijac.13481
DO - 10.1111/ijac.13481
M3 - Article
AN - SCOPUS:85079422441
VL - 17
SP - 1701
EP - 1712
JO - International Journal of Applied Ceramic Technology
JF - International Journal of Applied Ceramic Technology
SN - 1546-542X
IS - 4
ER -