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Laboratory Study on the Removal of Heavy Metals Using Apatite for Stabilization of Tailings at the Ulsan Abandoned Iron Mine  

Choi, Jung-Chan (Dept. of Environmental Geosciences, Pukyong National University)
Publication Information
Journal of Soil and Groundwater Environment / v.11, no.4, 2006 , pp. 1-9 More about this Journal
Abstract
The purpose of this study is to evaluate laboratory experiments on arsenic and cadmium removal from tailings using apatite at the Ulsan Abandoned Iron Mine, and to develop a stabilization technique. The results of this study show that the permeability is decreased proportionally to the amount of apatite when it is added below 8%, while this is almost constant when the amount of apatite is added above 10%. The water extraction test from tailings using deionized water for several days shows that pH (7.4-8.4) is almost constant or slightly increased when apatite is added below 8%, while it is slightly decreased when apatite is added above 10%. According to TCLP test, reduction of concentrations of heavy metals in leachate is proportional to amount of apatite added. It seems that precipitates generated from leachate-apatite chemical reaction are not redissolved. As a result, cadmium and arsenic in leachate is mostly removed when apatite is added above 10%, and it is suggested that a proper technique should be selected for field application because either mixed or layered method shows almost same removal efficiencies of cadmium and arsenic in tailings.
Keywords
Tailings; Removal Efficiencies; Stabilization; Apatite; TCLP;
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