Extraction behavior of As, Pb, and Zn from mine tailings with acid and base solutions.
The aim of this study was to investigate the extraction behavior of As, Pb, and Zn from mine tailings for considering the feasibility of soil washing. Extraction of metals was studied for different extractant doses, solid/liquid ratios, and equilibrium times. Generally, high extraction efficiency was achieved with HCl, H(3)PO(4), and H(2)SO(4), while H(2)SO(4) proved to be problematic with respect to Pb. NaOH was found to be favorable in removing As, while it was not effective at extracting Pb and Zn. With optimum conditions, which were a 1:5 solid-liquid ratio and 2h of extraction time, 0.5M of HCl extracted 21.1-72.5%, 9.9-86.5%, and 6.1-74.1% of As, Pb, and Zn, respectively. The power and Elovich function were adequate to describe adsorption kinetics. These results suggest that HCl and NaOH could be used to effectively extract all metals without selectivity and As with selectivity, respectively, in mine tailings and could be used for the design of soil washing process.
Yang
Jung-Seok
JS
Korea Institute of Science and Technology-Gangneung Institute, Gangneung 210-340, Republic of Korea.
Lee
Ju Young
JY
Baek
Kitae
K
Kwon
Tae-Soon
TS
Choi
Jaeyoung
J
D001151:Arsenic / Q000032:analysis / Q000302:isolation & purification*; D001673:Biodegradation, Environmental; D006851:Hydrochloric Acid / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007854:Lead / Q000032:analysis / Q000302:isolation & purification*; D008906:Mining; D012972:Sodium Hydroxide / Q000737:chemistry; D012987:Soil; D012989:Soil Pollutants / Q000032:analysis* / Q000737:chemistry; D013431:Sulfates / Q000737:chemistry; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000032:analysis; D018508:Water Purification / Q000379:methods*; D015032:Zinc / Q000032:analysis / Q000302:isolation & purification*
D012987:Soil; D012989:Soil Pollutants; D013431:Sulfates; D014874:Water Pollutants, Chemical; D007854:Lead; D012972:Sodium Hydroxide; D015032:Zinc; D001151:Arsenic; D006851:Hydrochloric Acid