Soil cleaning method

摘要

The present invention provides a soil cleaning method. The soil cleaning method is characterized in that after a pre-treatment step of mixing a dehydrating agent in soil to reduce a water content of the soil to 10 mass % or less is performed, a magnetic separation step of feeding the soil whose water content is reduced to 10 mass % or less in the pre-treatment step, to a dry magnetic separator to separate and remove a contaminant in coarse soil as magnetically attracted matter is performed. By bringing the soil into a dry state to separate the soil into magnetically attracted matter and magnetically unattracted matter and collecting the heavily contaminated magnetically attracted matter, it is possible to facilitate separating fine soil from contaminated soil, which makes it possible to easily reduce the content of the contaminant in the coarse soil.

主权项

1. A soil cleaning method, comprising:
pre-treatment steps of:
mixing a dehydrating agent in a soil, andreducing a water content of the soil to 10 mass % or less; a dry classification step of:
classifying the soil whose water content is 10 mass % or less into one of a gravel, a coarse soil, or a fine soil, wherein a classification point between the gravel and the coarse soil is 2 mm, and a classification point between the coarse soil and the fine soil is 75 μm to 150 μm; and magnetic separation steps of:
feeding the soil whose water content is 10 mass % or less to a dry magnetic separator; andseparating and removing a contaminant in the coarse soil and the fine soil as magnetically attracted matter using the dry magnetic separator, wherein the contaminant is selected from the group consisting of chromium, arsenic, fluorine, zinc, copper and oil.