Journal
RESOURCES CONSERVATION AND RECYCLING
Volume 154, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.resconrec.2019.104600
Keywords
MSWI fly ash; Direct melting; Co-reduction process; Secondary fly ash; Iron alloy; Vitrified slag
Categories
Funding
- National Natural Science Foundation of China [21906093]
- China Postdoctoral Science Foundation [2018M631488]
Ask authors/readers for more resources
Extraction of heavy metals is the preferred option for municipal solid waste incineration (MSWI) fly ash (FA) stabilization and reutilization. In this paper, a co-reduction process for FA and red mud (RM) was proposed. The complementary compositions of FA and RM were favorable for the volatilization of volatile heavy metals and the alloy formation of siderophile heavy metals in the co-reduction system. The molten stage temperature of co-reduction FA and RM can be decreased significantly to 1100 degrees C - 1300 degrees C, compared with the molten stage temperature of direct melting FA above 1400 degrees C. The wastes were converted into three products: iron alloy containing Fe, Cu, Ni, and Cr; secondary FA containing Pb, Zn, and Cd; and vitrified slag. In the optimized co-reduction process, 76.06 % Fe, 74.53 % Cu, 83.40 % Ni, and 58.44 % Cr can be recovered by iron alloy, and 98.95 % Cd, 98.21 % Pb, and 86.78 % Zn can be recovered by secondary FA. The contents of heavy metals in the vitrified slag are much lower than those in traditional direct melting slag. Consequently, this co-reduction process could be a more environmentally sound solution for beneficial reutilization of FA and RM.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available