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Author Baugh, K.
Sponsorship USDOE
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION ♦ HAZARDOUS MATERIALS ♦ WASTE DISPOSAL ♦ LEAD ♦ CONTAINMENT ♦ CALCITE ♦ SORPTION ♦ SOLUBILITY ♦ STABILIZATION ♦ TAILINGS ♦ STRONTIUM ♦ INDUSTRIAL WASTES ♦ LEACHING
Abstract The potential for disposal of acidic Pb-bearing process waste in an alkaline tailings pond was ascertain if Pb would become stabilized as opposed to dilute during mixing. This study demonstrated that codisposal of the filtercake residue, consisting of ferrihydroxide, lead sulfate and lead oxide phases (pH = 6.2, Pb = 43,000 mg/kg), with tailings containing abundant calcium and strontium carbonate (pH = 9.8, Pb = 2400 mg/kg) would result in Pb stabilization. The leachable Pb was greater (p <0.05%) for a sand-filtercake mixture compared with the tailings-filtercake at analogous ratios, demonstrating reactivity between filter cake and tailings. Stabilization occurs because abundant remnant calcite in the tailings neutralizes the acidic filtercake, facilitating sorption of Pb to ferrihydroxide at the pH of the filtercake/tailings mix and a >98.5% decrease in Pb solubility. Sorption (Kd{sub Pb} = 28 600 at pH 7.7) and possible precipitation of Ce-Pb and Ln-Pb oxides limit Pb solubility. These data suggest that disposal of acidic filtercake in an alkaline tailings pond would reduce Pb solubility to levels below relevant environmental standards. 25 refs., 5 figs., 2 tabs.
ISSN 00472425
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-09-01
Publisher Place United States
Journal Journal of Environmental Quality
Volume Number 25
Issue Number 5


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