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The effects of attrition on sandy and silty Pb-contaminated soil from shooting ranges were quantitatively investigated. The abrasion rate could be quantitatively evaluated using a population balance model from the size distribution of soil particles before and after attrition in an intensive mixer. The maximum abrasion rate was 0.047µm/s in the first stage of attrition (1min of grinding), and then declined between 2 and 4min of grinding. The two samples had similar maximum abrasion rates, but the decline in the abrasion rate was larger in the silty soil, which would have a thinner soft layer on the surface of the soil particles, than the sandy soil. The incremental change in the mass fraction of Pb in the 20µm size fraction before and after attrition showed the attrition was more effective for the oxides or organic-bound species and carbonate species of Pb chemical forms. [doi:10.2320/matertrans.M2012240]

Quantitative Evaluation of the Abrasion Rate in Attrition Washing on Lead Contaminated Soil from Shooting Ranges