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Chiang Mai Journal of Science, Faculty of Science, Chiang Mai University
 


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Removal of Heavy Metals from Electric Arc Furnace Dust Recycling Process by Alkaline Extraction


Paper Type 
Contributed Paper
Title 
Removal of Heavy Metals from Electric Arc Furnace Dust Recycling Process by Alkaline Extraction
Author 
Chanwit Thititanagul and Sureerat Polsilapa*
Email 
fengsrsn@ku.ac.th
Abstract:
This work shows that the level of lead (Pb) and chromium (Cr) in Electric Arc Furnace
(EAF) dust can be reduced to less than 1 ppm making it suitable for processing via electrowinning
for the production of high-quality zinc and zinc alloys. EAF dust is a considerable by-product from
the steel recycling process and can be recycled by pyro-hydrometallurgical processes. Zinc ferrite
(ZnFe2O4) is the main phase in the EAF dust and is a good source of zinc for the production of zinc
metal by electrowinning. However, it is very stable and needs to be transformed to zinc oxide prior to
cementation. The EAF dust is mixed with lime and then calcined at elevated temperatures to convert
the zinc ferrite to zinc oxide. The zinc is then leached by a mild NaOH solution. The leachant contains
lead and chromium which hinders further processing. In the process, zinc cementation was applied
in order to remove these heavy metals from the leachant. The optimum conditions were found to be;
Zn/Pb mole ratio 3.0, temperature of 60oC and 900 rpm stirring speed.
Start & End Page 
829 - 837
Received Date 
2019-07-19
Revised Date 
Accepted Date 
2020-04-20
Full Text 
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Keyword 
heavy metals, reduction, cementation, electric arc furnace dust, recycling process
Volume 
Vol.47 No.4 (Special Issue II : July 2020)
DOI 
Citation 
Thititanagul C. and Polsilapa* S., Removal of Heavy Metals from Electric Arc Furnace Dust Recycling Process by Alkaline Extraction, Chiang Mai Journal of Science, 2020; 47(4): 829-837.
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