Method of treating heavy metal and/or organic compound

摘要

The present invention provides a method of purifying polluted soil and/or burned ash containing heavy metals and/or organic compounds with a higher throughput than a conventional method. In this method, polluted soil and/or burned ash is dried by, for example, a rotary dryer (1) so that the moisture content is 5% by mass or less, preferably 3% by mass or less, and then large lumps having a particle diameter of 10 mm or more are removed by a vibrating screen (2). Only an undersize portion is formed into a briquette having a volume of about 6 cm<3> by a press molding machine (3). The briquette is charged in a rotary hearth furnace (4) together with the large lumps, and heated in the furnace (4) to remove or detoxify the heavy metals and organic compounds by evaporation with high efficiency.