Leaching characteristics of solidification system of C{sub 3}A/CuO

Journal Article · Mon Apr 01 04:00:00 EST 1996 · Journal of Environmental Engineering

DOI:https://doi.org/10.1061/(ASCE)0733-9372(1996)122:4(323)· OSTI ID:227869

Lin, C F ^[1]; Huang, H W ^[2]

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1. National Taiwan Univ., Taipei (Taiwan, Province of China)
2. Waste Recycle Foundation, Taipei (Taiwan, Province of China)

This study was to evaluate the leaching characteristics of a solidification/stabilization system, using a static-renewal leaching test in which the leachant was renewed periodically after intervals of static leaching. Tricalcium aluminate was selected as a solidification agent and CuO as a contaminant to simplify the solidified waste. The model solidified waste matrix was vulnerable to the renewable acetic acid (1 N) solutions. The release of Ca was rapid; in about 10 extractions, the amount of Ca released had reached the maximum. similarly, the leaching of Al was significant; about 90% of the total Al solidified was transferred to the acetic acid solution after 10 extractions. The proton promoted surface reaction is hypothesized to be the controlling process in dissolving the calcium compounds. The dissolution reactions would enlarge the capillary pores and produce new voids in the matrix that enhance solute leaching. Since both Ca and Al hydration compounds were rapidly leached out of the solid matrix, C{sub 3}A eventually played an insignificant role in immobilizing the CuO constituent.

• Sponsoring Organization: USDOE
• OSTI ID: 227869
• Journal Information: Journal of Environmental Engineering, Journal Name: Journal of Environmental Engineering Journal Issue: 4 Vol. 122; ISSN 0733-9372; ISSN JOEEDU
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
ALUMINIUM
COPPER OXIDES
HAZARDOUS MATERIALS
LEACHING
TECHNOLOGY ASSESSMENT
WASTE PROCESSING