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Related Experiment Video

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Sandy Soil Improvement through Microbially Induced Calcite Precipitation (MICP) by Immersion

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An engineered cover system for mine tailings using a hardpan layer: a solidification/stabilization method for layer

Joo Sung Ahn¹, Hocheol Song, Gil-Jae Yim

¹Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources, Daejeon, Republic of Korea. jsahn@kigam.re.kr

Journal of Hazardous Materials

|October 7, 2011

Summary

This study developed an engineered hardpan cover system using calcium silicate to reduce mine tailings

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Area of Science:

Environmental Engineering
Geotechnical Engineering
Materials Science

Background:

Mine tailings pose environmental risks, including water infiltration, acid generation, and sulfide oxidation.
Effective cover systems are crucial for mitigating these risks and ensuring long-term site stability.

Purpose of the Study:

To develop and evaluate an engineered hardpan cover system for mine tailings.
To reduce water infiltration, acid generation, and sulfide oxidation.
To assess the mechanical properties and heavy metal stabilization of the hardpan layer.

Main Methods:

Utilized hydrated lime and waterglass to create a calcium silicate binder for the hardpan layer.
Conducted laboratory tests to determine compressive strength and heavy metal leaching.
Implemented a pilot-scale field installation to evaluate system performance over time.
Monitored leachate characteristics and water infiltration during various environmental conditions.

Main Results:

The solidified/stabilized material exhibited sufficient compressive strength in laboratory settings.
Chemical leaching tests showed significant reductions in heavy metal concentrations.
A pilot-scale hardpan layer successfully stabilized after approximately 6 months, preventing water infiltration during heavy rainfall.
Sulfide minerals were encapsulated within the calcium silicate matrix, inhibiting further reactions.

Conclusions:

The engineered hardpan cover system effectively reduces water infiltration and stabilizes heavy metals in mine tailings.
Calcium silicate-based hardpans offer a viable solution for long-term mine waste management.
Long curing periods can compensate for initial variations in tailings characteristics, ensuring mechanical integrity.