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The contents of heavy metals such as Cu, Pb, Zn in all samples obtained from A sites around Ghahak mine exceed the 1st-area anxiety criteria of Korean soil contamination standard. When the samples were analyzed by Tessier's sequential extraction method to determine the chemical form of heavy metal components, more than of 50% belongs to residual types. First, 3 factors and 3 levels of each factor were identified through reverse flotation on one factor at a time. Based on them, the reverse flotation designed by Box-Behnken method was carried out and optimum flotation conditions were found to be 970 g/ton of MIBC dosage, 1,210 g/ton of oleic acid dosage, and 33°C of slurry temperature. Retests of contaminated soil on the conditions show that floating yield was 22%, and the removal efficiencies of Cu, Pb and Zn were 61.2%, 61.7% and 62.6%, respectively. Consequently, the results indicate that removal efficiencies of heavy metals by reverse flotation almost agree with percent of residual fraction.

Optimization of Reverse Flotation for Remediation of Soil Contaminated with Heavy Metals in the Vicinity of Gahak Mine