TY - JOUR
T1 - Selective recovery of chromium from ferronickel slag via alkaline roasting followed by water leaching
AU - Gu, Foquan
AU - Zhang, Yuanbo
AU - Peng, Zhiwei
AU - Su, Zijian
AU - Tang, Huimin
AU - Tian, Weiguang
AU - Liang, Guoshen
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 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 Open 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 Open Sharing Fund for the Large-Scale Instruments and Equipments of Central South University under Grant CSUZC201905, 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.
Funding Information:
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 Open 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 Open Sharing Fund for the Large-Scale Instruments and Equipments of Central South University under Grant CSUZC201905 , 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 .
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/7/15
Y1 - 2019/7/15
N2 - Chromium was selectively recovered from ferronickel slag by roasting the slag with addition of Na2O2, followed by water leaching. The thermodynamic analysis revealed that in the presence of Na2O2 at appropriate temperatures, the Cr2O3 in the ferronickel slag can be converted to NaCrO2, instead of Na2CrO4, which prevents the formation of highly toxic Cr (VI). The experimental results confirmed that under the optimal alkaline roasting and water leaching conditions of the mass ratio of ferronickel slag to Na2O2 of 1, roasting temperature of 600 °C, roasting time of 1 h, leaching temperature of 50 °C, leaching time of 1 h, and liquid-to-solid ratio of 10 mL/g, 92.33% of Cr was leached with 64.28% of Na and 11.16% of Si and only 0.06 wt % Cr was left in the leaching residue. The high leaching percentage of Cr was a result of the transformation of Cr2O3 in the ferronickel slag to NaCrO2 with a loose structure during alkaline roasting that was beneficial to water dissolution. Compared to the traditional alkaline roasting process, the proposed more environmentally friendly method did not produce toxic Cr (VI) during recovery of chromium and the resulting residue has potential to be used as a good construction material.
AB - Chromium was selectively recovered from ferronickel slag by roasting the slag with addition of Na2O2, followed by water leaching. The thermodynamic analysis revealed that in the presence of Na2O2 at appropriate temperatures, the Cr2O3 in the ferronickel slag can be converted to NaCrO2, instead of Na2CrO4, which prevents the formation of highly toxic Cr (VI). The experimental results confirmed that under the optimal alkaline roasting and water leaching conditions of the mass ratio of ferronickel slag to Na2O2 of 1, roasting temperature of 600 °C, roasting time of 1 h, leaching temperature of 50 °C, leaching time of 1 h, and liquid-to-solid ratio of 10 mL/g, 92.33% of Cr was leached with 64.28% of Na and 11.16% of Si and only 0.06 wt % Cr was left in the leaching residue. The high leaching percentage of Cr was a result of the transformation of Cr2O3 in the ferronickel slag to NaCrO2 with a loose structure during alkaline roasting that was beneficial to water dissolution. Compared to the traditional alkaline roasting process, the proposed more environmentally friendly method did not produce toxic Cr (VI) during recovery of chromium and the resulting residue has potential to be used as a good construction material.
KW - Alkaline roasting
KW - Cr (III)
KW - Ferronickel slag
KW - Selective recovery
KW - Water leaching
UR - http://www.scopus.com/inward/record.url?scp=85064157778&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2019.04.002
DO - 10.1016/j.jhazmat.2019.04.002
M3 - Article
C2 - 30981016
AN - SCOPUS:85064157778
SN - 0304-3894
VL - 374
SP - 83
EP - 91
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
ER -