Environmental Engineering Reference
In-Depth Information
FieldApplicationoftheStabilization
Stabilization of Arsenic in Mine Tailings
Stabilization.techniques.are.considered.the.best.treatment.method.for.mine.
tailings.. Because. mine. tailings.contain. extremely. high. amounts. of. arsenic.
geometrically,. other. treatments. cannot. reduce. the. leachability. of. arsenic.
as. well. as. stabilization.. Many. studies. have. been. conducted. using. the. sta-
bilizing. agents. introduced. earlier,. such. as. Portland. cement,. ly. ash,. lime,.
or.iron.oxyhydroxides..As.an.example.of.ield.application,.arsenic.stabiliza-
tion.using.magnetite.nanoparticles.was.applied.to.Samgwang.mine.tailings.
in.Korea.
Samgwang.mine.has.226,467.m
3
.of.mine.tailings.that.are.highly.contami-
nated. with. arsenic,. cadmium,. and. lead.. The. total. arsenic. concentration. of.
the. mine. tailing. is. approximately. 20,000.mg/kg,. which. is. extremely. high.
compared. with. common. soil. (1-40.mg/kg).. However,. the. arsenic. extracted.
by. TCLP. solution. was. around. 1.mg/kg,. indicating. the. amount. of. weakly.
bonded. arsenic. was. relatively. lower. than. that. allowed. by. the. regulations.
(5.mg/kg).
In.order.to.enhance.the.surface.area.and.mobility.of.mine.tailings,.synthe-
sized.magnetite.nanoparticles.were.injected.using.the.Jumbo.Special.Pattern.
(JSP).method,.as.shown.in.Figure.21.5.(Sheen.2001).
High pressure
packer
High pressure
packer
High pressure
packer
FIGURE 21.5
Jumbo.special.pattern.method..(From.Sheen,.M.S.,.
Ground Improv
.,.5(4),.155,.2001.)
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